Bill Gladstone is a marine biologist with research and teaching interests in marine conservation biology, fish behavioural ecology, and marine environmental management.
A major focus of Bill’s teaching has been the involvement of students in solving environmental issues to deepen field and classroom learning, and the excellence of these initiatives has been widely recognized through many teaching awards from the Dean, Vice-Chancellor, Carrick Institute, and the National Trust.
Particular research interests of Bill’s include the value of biodiversity surrogates for selecting and designing marine protected areas, reef fish spawning aggregations, environmental controls of reef fish spawning, and the management and conservation of marine biodiversity in developing countries.
Bill combines his academic career with work in the profession and has worked on many major national and international projects including outbreaks of crown-of-thorns starfish on the Great Barrier Reef, the Torres Strait Baseline Study (both for the Great Barrier Reef Marine Park Authority), management of international networks of marine protected areas in the Red Sea and Gulf of Aden (for the Regional Organization for the Conservation of the Environment of the Red Sea and Gulf of Aden PERSGA) and the Sulu-Sulawesi Sea Marine Ecoregion (for WWF), and the Strategic Action Programme for the Red Sea and Gulf of Aden (a Global Environment Facility project). He regularly works in the Port Stephens-Great Lakes and Batemans Marine Park.
Prior to starting work at UTS in January 2010, Bill was Associate Professor in the School of Environmental and Life Sciences, University of Newcastle (Central Coast campus).
Bill's recent industry collaborators for research and consultancies include:
- Hunter-Central Rivers Catchment Management Authority
- NSW Marine Parks
- Gosford City Council
- On Water Marine Services
- Sydney Metropolitan Catchment Management Authority
- Cardno Ecology Lab, and Sydney Water.
Bill currently serves on the Temperate East Bioregional Advisory Panel, for the Commonwealth Marine Reserve Review.
Bill was President, NSW Branch, Australian Marine Sciences Association (AMSA) for 2007-09 and a member of NSW Branch Council (since 2009). Bill’s membership of other professional associations includes: Australian Society for Fish Biology, Ecological Society of Australia, Royal Zoological Society of NSW, and the Society for Conservation Biology.
Bill was a partner (with the Community Environment Network CEN) in the establishment of the Central Coast Marine Discovery Centre at Terrigal in May 2009.
Bill is on the Editorial Board of the journal Aquatic Conservation: Marine and Freshwater Ecosystems.
Can supervise: YES
Effectiveness of biodiversity surrogates (indicator groups, habitats, flagship species, environmental diversity) and rapid assessment techniques in the selection and design of marine protected areas.
Fish spawning aggregations, in particular the factors differentiating aggregation sites and the behaviour of fishes at aggregation sites.
Biology, behaviour, and conservation of seahorses and pipefishes.
Approaches in coastal and marine environmental management, in particular the sustainable management of the human uses of marine biodiversity in developing countries.
- Ecosystems and their management
- Biodiversity science
- Resource assessment and monitoring
- Marine fish biology
- Conservation biology
- Environmental protection and management
Gladstone, W, Murray, BR & Hutchings, P 2020, 'Promising yet variable performance of cross-taxon biodiversity surrogates: a test in two marine habitats at multiple times', Biodiversity and Conservation, vol. 29, no. 9-10, pp. 3067-3089.View/Download from: Publisher's site
© 2020, Springer Nature B.V. Surrogates are a potential solution to the often-cited problem of there being insufficient information for biodiversity assessments or conservation planning. Cross-taxon surrogacy is the ability of a group of well-known taxa to represent variation in other poorly known taxa. To date, tests of the effectiveness of cross-taxon surrogacy in marine environments have yielded variable results and a significant qualification to the outcomes of tests that have demonstrated surrogacy is the near absence of tests for its persistence through time. This study tested for cross-taxon surrogacy and its persistence through time for three surrogates (crustaceans, molluscs, polychaetes). We used data on biodiversity variables and species assemblages of the surrogates and their targets that had been collected during multiple sampling events over 2.5 years in two habitats (seagrass, unvegetated sediment) in a large bay in south-eastern Australia. We tested surrogacy by fitting a series of linear models using generalized least squares for biodiversity variables and by Mantel tests of dissimilarity matrices of species assemblages. We also tested whether the type of data transformation affected Mantel tests. We found that each of the groups were effective surrogates for some but not all biodiversity variables (with molluscs or polychaetes being effective surrogates for species richness in both habitats), that none of the groups were effective surrogates for species assemblages, and that the outcomes of Mantel tests of dissimilarity matrices of surrogates and their targets were unaffected by the data transformation used. We conclude that while our results for surrogacy for biodiversity variables are promising the inconsistent results from other studies argues for caution about their application beyond the area and context in which they were assessed. The lack of evidence that we found for surrogates of species assemblages, and similar lack of evidence from o...
Ghazilou, A, Shokri, MR & Gladstone, W 2019, 'Comparison of baited remote underwater video (BRUV) and underwater visual census (UVC) for assessment of reef fish in a marginal reef in the Northern Persian gulf', Iranian Journal of Ichthyology, vol. 6, no. 3, pp. 197-207.View/Download from: Publisher's site
© 2019 Iranian Society of Ichthyology. Underwater Visual Census (UVC) and Baited Remote Underwater Video (BRUV) are broadly used methods to study fish assemblages in marine and estuarine environments. This study compared the results of BRUV and UVC methods for assessing seasonal trends in coral reef fish assemblages in a marginal reef in the northern Persian Gulf. In doing so, seasonal surveys of coral reef fishes were done using BRUV and UVC methods. Comparison of assemblage metrics driven from each method indicated that both methods may reveal similar patterns of seasonal changes in fish and trophic group assemblages while there may be between-method differences in species richness, total abundance, and trophic group abundances. The observed differences may be related to the longer sampling times of BRUV.
Voerman, SE, Glasby, TM, Gladstone, W & Gribben, PE 2019, 'Morphological variation of a rapidly spreading native macroalga across a range of spatial scales and its tolerance to sedimentation.', Marine environmental research, vol. 147, pp. 149-158.View/Download from: Publisher's site
Understanding how species' traits can shape winners and losers of environmental change can help resolve drivers of current community composition patterns and predict future drivers. Sedimentation is one of the main environmental stressors shaping coastal marine communities and tolerance of high sedimentation rates (e.g. via morphological variation) may allow for competitive dominance. In New South Wales, Australia, the abundance and range of the native green macroalga Caulerpa filiformis have increased over recent decades, apparently associated with sediment disturbance. We used field measurements to test hypotheses about morphological variability in C. filiformis in relation to local- and large-scale environmental variation in water depth, sediment cover and latitude. Using a lab experiment, we tested hypotheses about survival and morphological change under different sedimentation regimes. In the field, C. filiformis fronds were more elongated and less branched when a sediment veneer is present and when water depth increased (i.e. reduced light). At larger spatial scales, frond length and width decreased with increased latitude, but latitude was less important in explaining the variation C. filiformis' length than were depth or sedimentation. Our lab experiment showed a high tolerance to sedimentation, aided by increased investment in vertical growth. This study shows that rapid morphological plasticity is a likely key attribute of the spreading native macroalga C. filiformis. We argue that having a broad environmental tolerance is key to define a species success under environmental change.
Bradley, DJ, Gladstone, W & Gribben, PE 2018, 'Relationships between the spread of Caulerpa filiformis and fish communities on temperate rocky reefs.', Journal of fish biology, vol. 93, no. 1, pp. 12-20.View/Download from: Publisher's site
The previously sub-dominant native marine macrophyte Caulerpa filiformis is now dominant on many sub-tidal rocky reefs in New South Wales (NSW), Australia and is expanding its distribution. As C. filiformis is highly chemically defended and structurally different to co-occurring habitat-forming macrophytes, two key attributes that govern fish assemblages, we hypothesized that fish assemblages, particularly herbivorous fishes, would be different at sites where C. filiformis occurred from where it was previously absent and within sites, fish community structure would be correlated to the cover of C. filiformis. We investigated these hypotheses by determining reef-associated fish assemblage attributes (assemblage structure, species richness, total abundance, Shannon-Weiner diversity, abundance of herbivorous species) along transects within sites where C. filiformis was present and absent. Surprisingly, despite large patches and very high densities of C. filiformis on the reefs we sampled, at larger spatial scales (i.e., among sites) no fish assemblage metrics differed between sites with large stands of C. filiformis and sites without the alga. Moreover the abundance of one dominant herbivore, the rock cale Aplodactylus lophodon, was greater at sites within large beds of C. filiformis. At smaller spatial scales, however, i.e. within sites where C. filiformis was present, fish assemblages did vary as a function of C. filiformis cover along transects, although this was not consistent across sampling times. Overall, our results suggest that the potential effects of the spread of this alga on faunal communities warrants further investigation.
© 2017 Elsevier Ltd There are many examples of native macrophytes becoming locally dominant and spreading outside their traditional distributions, but the causes and impacts are often not understood. In New South Wales, Australia, the green alga Caulerpa filiformis is undergoing a range expansion and has transitioned from a subdominant to a dominant alga on several rocky shores around the Sydney coastline. Here we investigated relationships between established patches of C. filiformis, the habitat it occupies and associated algal communities at multiple subtidal sites over the green alga's 700 km range. We tested the following predictions: 1) C. filiformis cover differs among substrata, being greatest on turf-forming algae; 2) C. filiformis cover is positively related to environmental variables linked to increased sedimentation (e.g. reduced reef width, surface slope, increased rugosity and distance from shore); 3) occurrence of C. filiformis is associated with a change in macrophyte community structure and a reduction of macrophyte richness; 4) intact native algal canopies inhibit C. filiformis spread, but turf-forming algae and bare sand are susceptible to invasion. Substratum associations were highly consistent among sites, but contrary to our prediction, C. filiformis was most commonly associated with rock or rock + sand substratum and less frequently associated with turf-forming algae substratum. C. filiformis cover was negatively correlated with reef width, which explained most of the variation observed, although local scale variables distance from shore, reef slope, and water depth were also correlated with C. filiformis cover. Algal diversity and community composition typically differed in the presence of C. filiformis, often with a reduction of algal abundances, in particular Sargassum spp., although results varied among substrata and sites. However, monitoring of borders suggested that C. filiformis does not invade and outcompete undisturbed adjacent ca...
Voyer, M & Gladstone, W 2017, 'Human considerations in the use of marine protected areas for biodiversity conservation', Australian Zoologist, vol. 39, no. 2, pp. 173-180.View/Download from: Publisher's site
© 2018 Royal Zoological Society of New South Wales. Marine protected areas (MPAs) are one approach, amongst many, for the protection of marine biodiversity. Although proven to be effective at protecting biodiversity and to be supported by local and wider communities, the implementation of some MPAs has been very contentious especially with fishing stakeholders. We researched the causes of these issues by examining the experience of implementation of the Batemans Marine Park in New South Wales, Australia. While MPA selection and management need to be based on rigorous science, a commensurate level of attention needs to be applied to understanding the social systems that also play a role in determining the protection measures and approaches. The most pressing issue that needs to be resolved early on in a planning process is the MPA's objectives, and whether these objectives are well understood and accepted by the local community. Building community support for MPAs also involves taking into account the different systems of knowledge and views of the natural world that exist within the community. Science alone is not sufficient to convince communities of the need for MPAs or their value in achieving conservation outcomes. Incorporating 'bottom-up' approaches into communication and engagement strategies will allow for a greater diversity of voices to be heard and acknowledged, protecting the planning processes against polarisation. Engaging local communities needs to go beyond large-scale consultation processes to include more rigorous, integrated social, economic and ecological assessment exercises, involving a collaborative participatory approach. Context is important and planning processes need to recognise the individual and unique needs of each affected community. Rigid ideas around the best means of achieving biodiversity protection combined with 'a one size fits all' approach to planning and community engagement are likely to exacerbate conflict and division a...
Ghazilou, A, Shokri, MR & Gladstone, W 2016, 'Animal v. plant-based bait: does the bait type affect census of fish assemblages and trophic groups by baited remote underwater video (BRUV) systems?', JOURNAL OF FISH BIOLOGY, vol. 88, no. 5, pp. 1731-1745.View/Download from: Publisher's site
Ghazilou, A, Shokri, MR & Gladstone, W 2016, 'Application of baited remote underwater video stations to assess benthic coverage in the Persian Gulf', MARINE POLLUTION BULLETIN, vol. 105, no. 2, pp. 606-612.View/Download from: Publisher's site
Ghazilou, A, Shokri, MR & Gladstone, W 2016, 'Coral reef fish assemblages along a disturbance gradient in the northern Persian Gulf: A seasonal perspective', MARINE POLLUTION BULLETIN, vol. 105, no. 2, pp. 599-605.View/Download from: Publisher's site
Gladstone, W, Arthington, AH, Dulvy, NK & Winfield, IJ 2016, 'Fish conservation in freshwater and marine realms: status, threatsand management', Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 26, pp. 838-857.View/Download from: Publisher's site
Despite the disparities in size and volume of marine and freshwater realms, a strikingly similar number ofspecies is found in each – with 15 150 Actinopterygian ﬁshes in fresh water and 14 740 in the marine realm. Theirecological and societal values are widely recognized yet many marine and freshwater ﬁshes increasingly risk local,regional or global extinction.2. The prevailing threats in aquatic systems are habitat loss and degradation, invasive species, pollution,over-exploitation and climate change. Unpredictable synergies with climate change greatly complicate the impactsof other stressors that threaten many marine and freshwater ﬁshes.3. Isolated and fragmented habitats typically present the most challenging environments for small, specializedfreshwater and marine ﬁshes, whereas overﬁshing is by far the greatest threat to larger marine and freshwaterspecies. Species that migrate within or between freshwater and marine realms may face high catchability inpredictable migration bottlenecks, and degradation of breeding habitat, feeding habitat or the interveningmigration corridors.4. Conservation reserves are vital to protect species-rich habitats, important radiations, and threatened endemicspecies. Integration of processes that connect terrestrial, freshwater and marine protected areas promises moreeffective conservation outcomes than disconnected reserves. Diadromous species in particular require moreattention in aquatic restoration and conservation planning across disparate government agencies.5. Human activities and stressors that increasingly threaten freshwater and marine ﬁshes must be curbed toavoid a wave of extinctions. Freshwater recovery programmes range from plans for individual species torecovery of entire basin faunas. Reducing risks to threatened marine species in coastal habitats also requiresconservation actions at multiple scales. Most of the world's larger economically important ﬁsheries are relativelywell-monitored and well-managed but there...
McPhee, JJ, Freewater, P, Gladstone, W, Platell, ME & Schreider, MJ 2015, 'Glassfish switch feeding from thalassinid larvae to crab zoeae after tidal inundation of saltmarsh', MARINE AND FRESHWATER RESEARCH, vol. 66, no. 11, pp. 1037-1044.View/Download from: Publisher's site
The biological success of Marine Protected Areas (MPAs) depends to a large extent on their social acceptability, sometimes referred to as a social licence. Local resistance has slowed international progress towards a global network of MPAs. The causes of local resistance and limited social acceptability are poorly known, which constrains the development of new planning paradigms that could address these issues. Two case studies in New South Wales, Australia determined the factors that influenced community attitudes towards MPAs. The Port Stephens-Great Lakes Marine Park (PSGLMP) and Batemans Marine Park (BMP) underwent virtually identical and concurrent planning processes, however resistance to the BMP was more intense and sustained. Differences in the demographics, history, local media coverage and social impacts of each marine park contributed to these different community responses. The BMP demonstrated the 'perfect storm' of opposition triggers - a community struggling in the transition away from a primary production economy, a highly politicised media dominated by powerful elites with ideological objections to the park, and social impacts sufficiently profound to motivate local citizens to support an active campaign against the park. These impacts included loss of access, identity and increased competition for resources. This research points to the importance of developing a deeper understanding of the social, cultural and political landscape of the communities in which MPAs are proposed and a rethink of planning processes to better incorporate community objectives and knowledge.
Voyer, M, Gollan, N, Barclay, K & Gladstone, W 2015, ''It's part of me', understanding the values, images and principles of coastal users and their influence on the social acceptability of MPAs', MARINE POLICY, vol. 52, pp. 93-102.View/Download from: Publisher's site
Chivers, WJ, Gladstone, W & Herbert, RD 2014, 'Programmatic detection of spatial behaviour in an agent-based model', Informaton Technology in Industry, vol. 2, no. 2, pp. 38-43.
The automated detection of aspects of spatial behaviourin an agent-based model is necessary for model testingand analysis. In this paper we compare four predictors of herdingbehaviour in a model of a grazing herbivore. We find that a) the mean number of neighbours adjustedto account for population variation and b) the mean Hammingdistance between rows of the two-dimensional environment can beused to detect herding. Visual inspection of the model behaviourrevealed that herding occurs when the herbivore mobility reachesa threshold level. Using this threshold we identify a limits forthese predictors to use in the program code. These results apply only to one set of parameters and environmentsize; future research will involve a wider parameterspace.
Models of near-exclusive predatorprey systems such as that of the Canadian lynx and snowshoe hare have included factors such as a second prey species, a Holling Type II predator response and climatic or seasonal effects to reproduce sub-sets of six signature patterns in the empirical data. We present an agent-based model which does not require the factors or constraints of previous models to reproduce all six patterns in persistent populations. Our parsimonious model represents a generalised predator and prey species with a small prey refuge. The lack of the constraints of previous models, considered to be important for those models, casts doubt on the current hypothesised mechanisms of exclusive predatorprey systems. The implication for management of the lynx, a protected species, is that maintenance of an heterogeneous environment offering natural refuge areas for the hare is the most important factor for the conservation of this species.
Dixon, KL, Hutchings, PA & Gladstone, W 2014, 'Effectiveness of habitat classes as surrogates for biodiversity in marine reserve planning', Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 24, no. 4, pp. 463-477.View/Download from: Publisher's site
1. Surrogates are used in marine conservation planning when there is limited information on the distribution of biodiversity, and representation of species and assemblage diversity are conservation goals. With prior confirmation of their relationship to spatial variation in biodiversity, habitat classification schemes are a potentially useful surrogate. 2. Polychaetes can comprise over one-third of species of benthic infaunal assemblages, they are the most frequent and abundant marine metazoans in benthic environments, and they are a reliable surrogate for other macrobenthic taxa. 3. It was tested whether polychaete biodiversity differed among six estuarine habitat classes defined for conservation planning in the Port StephensGreat Lakes Marine Park, New South Wales, Australia: subtidal sand, mud, muddy sand, and seagrass beds comprising Posidonia australis, Zostera capricorni and mixed Posidonia/Zostera. Polychaetes were sampled from replicate sites in each habitat and differences among habitat classes in species richness, abundance, and assemblage structure were examined. Several environmental variables, known to be important determinants of polychaete distribution, were also quantified at each site. 4. Ninety-five species of polychaetes (belonging to 35 families) were identified. Species richness and abundance did not differ among the habitat classes. Polychaete assemblages of subtidal sand differed from assemblages in both mud and muddy sand, however, assemblages in all other habitats were not different. A combination of some of the measured environmental variables (distance to the estuary entrance, depth, sediment grain size) was a more important determinant of assemblage variation than the habitat classes. 5. Using these predictors, an alternative habitat classification scheme to the scheme currently utilized in marine park planning is proposed. 6. This study demonstrates the critical importance of testing assumptions about surrogacy and an approach for ref...
Dixon-Bridges, KA, Gladstone, W & Hutchins, P 2014, 'One new species of Micronephthys Friedrich, 1939 and one new species of Nephtys Cuvier, 1817 (Polychaeta: Phyllodocida: Nephtyidae) from eastern Australia with notes on Aglaophamus ustraliensis (Fauchald, 1965) and a key to all Australian species', Zootaxa, vol. 3872, no. 5, pp. 513-540.View/Download from: Publisher's site
Gladstone, W 2014, 'Criticisms of science, social impacts, opinion leaders, and targets for no-take zones led to cuts in New South Wales' (Australia) system of marine protected areas', Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 24, no. 3, pp. 287-296.View/Download from: Publisher's site
On 12 March 2013 the state Government of New South Wales (NSW), Australia, announced a new approach to managing its marine environment (including calling it the `marine estate). This included announcing an amnesty on recreational shore-based fishing in all ocean beach and headland sanctuary zones (i.e. no-take) in its State-wide system of large multiple-use marine protected areas (MPAs), called marine parks, and a moratorium on declaring more marine parks (NSW Government, 2013a). The NSW Government Ministers responsible for marine parks stated `decisions around the management of the NSW marine estate will now be based on science and in the long term interest of community, marine ecosystems and industry. The NSW Government is delivering on its election commitment for a common sense marine parks policyAfter years of political interference and decisions based on poor or incomplete sciencethe credibility of Marine Parks and our fishing industries has been undermined (NSW Government, 2013a), and `There is little or no scientific basis for preventing line fishing from landWe are immediately giving an amnesty to that (The Coffs Coast Advocate, 2013). Despite the relatively minor change in total area of no-take zones in NSWs marine parks this decision attracted the most attention from conservation groups, recreational fishing groups and scientists. However, the changes announced also included a potentially far-reaching shift in policy approach to biodiversity conservation away from the nationally agreed precautionary use of a representative network of MPAs to a risk-based framework. Australia has been implementing a National Representative System of Marine Protected Areas (NRSMPA) as a uniform national approach to conserve marine biodiversity. In 1998 the governments of Australia with marine coasts (i.e. the Commonwealth, all States, the Northern Territory) undertook to establish the NRSMPA by 2012 to achieve national goals for sustainable development (Commonwealth of Au...
Gladstone, W & Courtenay, GC 2014, 'Impacts of docks on seagrass and effects of management practices to ameliorate these impacts', Estuarine Coastal And Shelf Science, vol. 136, pp. 53-60.View/Download from: Publisher's site
Seagrasses have high conservation and human-use values, but around the world they are being damaged by human activities. Compared to the larger spatial scale at which some human activities affect estuaries and their seagrasses (e.g. catchment disturbance, dredging, pollution, trawling), recreational boating and infrastructure of moorings and docks act at smaller scales. However, the cumulative effects contribute to stresses acting on seagrass beds. This study assessed the effects of docks on the native seagrass Zostera muelleri subsp. capricorni in an estuary in south-east Australia and of current management practices designed to reduce dock impacts on this seagrass. A field survey found that seagrass biomass was significantly reduced below docks, and the effects were not influenced by dock orientation. Management practices requiring the use of a mesh decking to provide greater light penetration reduced, but did not eliminate, the reduction in seagrass biomass caused by docks. A modified beyond BACI experiment provided evidence for a causal link between the installation of wooden or mesh docks and reductions in biomass of seagrass. The reduction in biomass was apparent 6 mo after dock installation, and by 26 mo seagrass biomass had declined by at least 90%. Faced with increasing coastal populations, increases in recreational use, and continued pressures from other human activities, alternative management practices that further minimize the effects of docks are needed.
Harasti, D, Martin-Smith, K & Gladstone, W 2014, 'Ontogenetic and sex-based differences in habitat preferences and site fidelity of White's seahorse Hippocampus whitei', JOURNAL OF FISH BIOLOGY, vol. 85, no. 5, pp. 1413-1428.View/Download from: Publisher's site
Seahorses are iconic charismatic species that are often used to `champion marine conservation causes around the world. As they are threatened in many countries by over-exploitation and habitat loss, marine protected areas (MPAs) could help with their protection and recovery. MPAs may conserve seahorses through protecting essential habitats and removing fishing pressures. Populations of White's seahorse, Hippocampus whitei, a species endemic to New South Wales, Australia, were monitored monthly from 2006 to 2009 using diver surveys at two sites within a no-take marine protected areas established in 1983, and at two control sites outside the no-take MPA sites. Predators of H. whitei were also identified and monitored. Hippocampus whitei were more abundant at the control sites. Seahorse predators (3 species of fish and 2 species of octopus) were more abundant within the no-take MPA sites. Seahorse and predator abundances were negatively correlated. Substantial variability in the seahorse population at one of the control sites reinforced the importance of long-term monitoring and use of multiple control sites to assess the outcomes of MPAs for seahorses. MPAs should be used cautiously to conserve seahorse populations as there is the risk of a negative impact through increased predator abundance.
Morton, JK & Gladstone, W 2014, 'Changes in rocky reef fish assemblages throughout an estuary with a restricted inlet', Hydrobiologia, vol. 724, no. 1, pp. 235-253.View/Download from: Publisher's site
Rocky reef habitat is common in many estuaries, yet its role as a habitat for fishes is poorly understood. There is also limited understanding of how access of coastal species into estuaries and habitat quality can affect the distribution of rocky reef fishes within estuaries. This study used baited remote underwater video stations to determine spatial patterns in fish assemblages associated with rocky reef habitat throughout a barrier estuary with a permanently open but restricted inlet. Estuarine rocky reefs provided habitat for a diverse assemblage of fishes, many of which were large juveniles and subadults. In the absence of a pronounced salinity or temperature gradient, a clear transition in fish assemblages occurred from coastal waters, through the inlet channel, to the central estuary, and into the inner estuary. The inlet channel, notably its narrowness and length, limits tidal input into this estuary, which acts as a significant impediment to the dispersal of many coastal fishes, and insufficient habitat excludes many coastal rocky reef species from the inner estuary. This study highlights the need to recognise estuarine rocky reefs as providing habitat for diverse fish assemblages and the role inlets play in restricting access of coastal species.
Voyer, M, Gladstone, W & Goodall, H 2014, 'Understanding marine park opposition: the relationship between social impacts, environmental knowledge and motivation to fish', AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS, vol. 24, no. 4, pp. 441-462.View/Download from: Publisher's site
Alexander, TJ & Gladstone, W 2013, 'Assessing the effectiveness of a long-standing rocky intertidal protected area and its contribution to the regional conservation of species, habitats and assemblages', Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 23, pp. 111-123.View/Download from: Publisher's site
The acceptance of reserves as a useful management strategy relies on evidence of their effectiveness in preserving stocks of harvested species and conserving biodiversity. A history of ad hoc decisions in terrestrial and marine protected area planning has meant that many of these areas are contributing inefficiently to conservation goals. The conservation value of existing protected areas should be assessed when planning the placement of additional areas in a reserve network. This study tested (1) the effectiveness of protection for intertidal molluscs of a marine reserve (Bouddi Marine Extension, NSW, Australia) established in 1971, and (2) the contribution of the protected area to the conservation of regional species, assemblages, and habitats. The shell length and population density of one harvested (Cellana tramoserica), and three non-harvested species (Bembicium nanum, Morula marginalba, Nerita atramentosa) of intertidal molluscs were examined in the protected area and two reference locations over two seasons. The heavily collected limpet C. tramoserica was significantly larger in the protected area and was the only species to exhibit a significant difference. No species significantly differed in population density between the protected area and reference locations. Temporally replicated surveys of macro-molluscs at 21 locations over 75?km of coastline identified that the existing protected area included 50% of species, two of five assemblage types and 19 of 20 intertidal rocky shore habitats surveyed in the study region. Reservation of a further three rocky reefs would protect a large proportion of species (71%), a representative of each assemblage and all habitat types. Despite originally being selected in the absence of information on regional biodiversity, the protected area is today an effective starting point for expansion to a regional network of intertidal protected areas.
Cvitanovic, C, Wilson, SK, Fulton, CJ, Almany, GR, Anderson, P, Babcock, RC, Ban, NC, Beeden, RJ, Beger, M, Cinner, J, Dobbs, K, Evans, LS, Farnham, A, Friedman, KJ, Gale, K, Gladstone, W, Grafton, Q, Graham, NA, Gudge, S, Harrison, PL, Holmes, TH, Johnstone, N, Jones, GP, Jordan, A, Kendrick, AJ, Klein, CJ, Little, LR, Malcolm, HA, Morris, D, Possingham, HP, Prescott, J, Pressey, RL, Skilleter, GA, Simpson, C, Waples, K, Wilson, D & Williamson, DH 2013, 'Critical research needs for managing coral reef marine protected areas: Perspectives of academics and managers', Journal of Environmental Management, vol. 114, pp. 84-91.View/Download from: Publisher's site
Marine protected areas (MPAs) are a primary policy instrument for managing and protecting coral reefs. Successful MPAs ultimately depend on knowledge-based decision making, where scientific research is integrated into management actions. Fourteen coral reef MPA managers and sixteen academics from eleven research, state and federal government institutions each outlined at least five pertinent research needs for improving the management of MPAs situated in Australian coral reefs. From this list of 173 key questions, we asked members of each group to rank questions in order of urgency, redundancy and importance, which allowed us to explore the extent of perceptional mismatch and overlap among the two groups. Our results suggest the mismatch among MPA managers and academics is small, with no significant difference among the groups in terms of their respective research interests, or the type of questions they pose. However, managers prioritised spatial management and monitoring as research themes, whilst academics identified climate change, resilience, spatial management, fishing and connectivity as the most important topics. Ranking of the posed questions by the two groups was also similar, although managers were less confident about the achievability of the posed research questions and whether questions represented a knowledge gap. We conclude that improved collaboration and knowledge transfer among management and academic groups can be used to achieve similar objectives and enhance the knowledge-based management of MPAs.
The Gulf and Red Sea possess diverse coastal and marine environments that support rapidly expanding mass tourism. Despite the associated environmental risks, there is no analysis of the tourism-related literature or recent analysis of impacts. Environmental issues reported in 101 publications (25 from the Gulf, 76 from the Red Sea) include 61 purported impacts (27 from the Gulf, 45 from the Red Sea). Gulf literature includes quantitative studies (68% publications) and reviews (32%), and addresses mostly land reclamation and artificial habitats. Most Gulf studies come from Iran and UAE (64%). Red Sea literature includes quantitative studies (81%) and reviews (11%), with most studies occurring in Egypt (70%). The most published topics relate to coral breakage and its management. A full account of tourisms environmental impacts is constrained by limited tourism data, confounding of impacts with other coastal developments, lack of baseline information, shifting baselines, and fragmentation of research across disciplines.
Harasti, DI & Gladstone, W 2013, 'Does underwater flash photography affect the behaviour, movement and site persistence of seahorses?', Journal Of Fish Biology, vol. 83, no. 5, pp. 1344-1353.View/Download from: Publisher's site
The effect of flash photography on seahorse species has never been tested. An experiment was established to test the effect of flash photography and the handling of Hippocampus whitei, a medium-sized seahorse species endemic to Australia, on their behavioural responses, movements and site persistence. A total of 24 H. whitei were utilized in the experiment with eight in each of the three treatments (flash photography, handling and control). The effect of underwater flash photography on H. whitei movements was not significant; however, the effect of handling H. whitei to take a photograph had a significant effect on their short-term behavioural responses to the photographer. KaplanMeier log-rank test revealed that there was no significant difference in site persistence of H. whitei from each of the three treatments and that flash photography had no long-term effects on their site persistence. It is concluded that the use of flash photography by divers is a safe and viable technique with H. whitei , particularly if photographs can be used for individual identification purposes.
Shokri, MR & Gladstone, W 2013, 'Integrating vulnerability into estuarine conservation planning: Does the data treatment method matter?', Estuaries and Coasts, vol. 36, no. 4, pp. 866-880.View/Download from: Publisher's site
Protected areas will more efficiently protect biodiversity if threats to the persistence of populations are addressed. Seagrass meadows are globally regarded as critical habitats because of their ecosystem services, human use values, and their diminishing extent. While selecting priority areas for conservation of seagrass meadows is largely aimed at maximizing the protection of their biodiversity, little attention is paid to consider simultaneously the representation of biodiversity and the minimization of threats. This study developed and tested an approach for integrating vulnerability of seagrass meadows to anthropogenic disturbance with the selection of estuarine-protected areas. Vulnerability was measured by data on different land use types in subcatchments. Conservation value was measured by irreplaceability, diversity indices, and rarity of macroinvertebrate species in seagrass meadows. Vulnerability was incorporated into conservation planning by plotting grid cell scores for conservation value versus their scores for vulnerability. The results showed that the performance of the model for the integration of vulnerability into estuarine conservation planning was sensitive to the data treatment. The vulnerability of seagrass meadows and accordingly the arrangement of priority areas for conservation and management attention may change if more information is incorporated into the measurement of vulnerability.
Shokri, MR & Gladstone, W 2013, 'Limitations of habitats as biodiversity surrogates for conservation planning in estuaries', Environmental Monitoring and Assessment, vol. 185, pp. 3477-3492.View/Download from: Publisher's site
Increasing pressures on global biodiversity and lack of data on the number and abundance of species have motivated conservation planners and researchers to use more readily available information as proxies or surrogates for biodiversity. "Habitat" is one of the most frequently used surrogates but its assumed value in marine conservation planning is not often tested. The present study developed and tested three alternative habitat classification schemes of increasing complexity for a large estuary in south-east Australia and tested their effectiveness in predicting spatial variation in macroinvertebrate biodiversity and selecting estuarine protected areas to represent species. The three habitat classification schemes were: (1) broad-scale habitats (e.g., mangroves and seagrass), (2) subdivision of each broad-scale habitat by a suite of environmental variables that varied significantly throughout the estuary, and (3) subdivision of each broad-scale habitat by the subset of environmental variables that best explained spatial variation in macroinvertebrate biodiversity. Macroinvertebrate assemblages differed significantly among the habitats in each classification scheme. For each classification scheme, habitat richness was significantly correlated with species richness, total density of macroinvertebrates, assemblage dissimilarity, and summed irreplaceability. However, in a reserve selection process designed to represent examples of each habitat, no habitat classification scheme represented species significantly better than a random selection of sites. Habitat classification schemes may represent variation in estuarine biodiversity; however, the results of this study suggest they are inefficient in designing representative networks of estuarine protected areas.
Voyer, M, Dreher, TI, Gladstone, W & Goodall, H 2013, 'Who cares wins: The role of local news and news sources in influencing community responses to marine protected areas', Ocean & Coastal Management, vol. 85, no. A, pp. 29-38.View/Download from: Publisher's site
Mass media is a key tool by which environmental interventions, such as Marine Protected Areas (MPAs) are communicated to the public. The way in which local news outlets present and explain MPAs to local communities is likely to be influential in determining how they respond to the proposal. In particular the tendency of news media to focus on areas of conflict and dispute ensures ideology and politics play a central role in reporting of MPA proposals, often simplifying debate into an `us versus them or `fishers versus conservationists ideological conflict. This can lead to the outright rejection of an MPA or undermine acceptance of the park within local communities. The media coverage of two marine parks in NSW, Australia was compared to determine the way in which news presented the parks to each community and how this may have influenced public acceptance of the parks. In particular the study examined the role ideology and politics played in the news coverage of each park by investigating the way in which the news was framed and the positions of key media spokespeople. Media coverage of the Batemans Marine Park appears to have been highly politicised and heavily influenced by the strong convictions of a small handful of prominent spokespeople. By way of contrast media coverage of the Port Stephens Great Lakes Marine Park was more nuanced and drew from a wide range of sources. This research provides insight into how areas of conflict could be reframed as opportunities that enhance MPA planning exercises and highlights how ideology can help shape community sentiment. Acknowledging the role of ideology in contested areas such as these allows for the development of strategies that can accommodate as well as moderate its influence. These strategies may include the incorporation of `bottom up approaches into MPA planning, the promotion and support of a range of voices within the community, and seeking out and building upon common ground and shared values.
Courtenay, GC, Smith, D & Gladstone, W 2012, 'Occupational health issues in marine and freshwater research', Journal of Occupational Medicine and Toxicology, vol. 7, no. 4, pp. 1-11.View/Download from: Publisher's site
Marine and freshwater scientists are potentially exposed to a wide variety of occupational hazards. Depending on the focus of their research, risks may include animal attacks, physiological stresses, exposure to toxins and carcinogens, and dangerous environmental conditions. Many of these hazards have been investigated amongst the general population in their recreational use of the environment; however, very few studies have specifically related potential hazards to occupational exposure. For example, while the incidence of shark and crocodile attacks may invoke strong emotions and the occupational risk of working with these animals is certainly real, many more people are stung by jellyfish or bitten by snakes or dogs each year. Furthermore, a large proportion of SCUBA-related injuries and deaths are incurred by novice or uncertified divers, rather than professional divers using aquatic environments. Nonetheless, marine and freshwater research remains a potentially risky occupation, and the likelihood of death, injury and long-term health impacts still needs to be seriously considered.
Gladstone, W, Lindfield, S, Coleman, MA & Kelaher, BP 2012, 'Optimisation of baited remote underwater video sampling designs for estuarine fish assemblages', Journal of Experimental Marine Biology and Ecology, vol. 429, pp. 28-35.View/Download from: Publisher's site
Baited remote underwater video stations (BRUVS) are used for monitoring fish assemblages and assessing management effectiveness in reef environments but are infrequently used in estuaries. A review of the BRUVS literature found that most adopted sampling designs from other studies were rarely designed from pilot studies. This potentially compromises their value for monitoring natural and anthropogenic variation. The aims of this study were: (i) to assess the suitability of BRUVS for sampling fishes in estuarine habitats (seagrass beds and unvegetated sediments) and (ii) to develop an optimal and cost effective sampling methodology for each habitat. Fishes in both habitats were sampled independently using BRUVS with soak times of 30, 60, 90 min (n = 4). Thirty five species of fishes were recorded including 18 species of economic importance. Mean number of species, mean total Max N and mean Max N of species did not differ among soak times. Precision was generally greater in seagrass and in both habitats it improved with increasing soak time. Bootstrapping revealed that greater improvements in precision occurred from increasing soak time rather than increasing replication. A sampling design with n = 5 replicates of 90 min soak time was optimal for most variables. This sampling effort is greater than many current applications of BRUVS. The results highlight the importance of pilot studies to optimise sampling methods and develop cost effective and statistically-robust monitoring programs.
Harasti, DI, Martin-smith, K & Gladstone, W 2012, 'Population dynamics and life history of a geographically restricted seahorse, Hippocampus whitei', Journal Of Fish Biology, vol. 81, no. 4, pp. 1297-1314.View/Download from: Publisher's site
The aim of this study was to collect data on population dynamics and life history for White's seahorse Hippocampus whitei, a geographically restricted species that is listed as data deficient under the IUCN Red List. Data from H. whitei populations were collected from two regions, Port Stephens (north) and Sydney Harbour (south) in New South Wales, Australia, covering most of the known range of H. whitei, from 2005 to 2010. Over 1000 individuals were tagged using fluorescent elastomer and on subsequent recaptures were re-measured for growth data that were used in a forced GullandâHolt plot to develop growth parameters for use in a specialized von Bertalanffy growth-function model. Growth parameters for Port Stephens were: females Lâ = 149Â·2 mm and K = 2Â·034 per year and males Lâ = 147Â·9 mm and K = 2Â·520 per year compared with estimates from Sydney Harbour: females Lâ = 139Â·8 mm and K = 1Â·285 per year and males Lâ = 141Â·6 mm and K = 1Â·223 per year. Whilst there was no significant difference in growth between sexes for each region, H. whitei in Port Stephens grew significantly quicker and larger and matured and reproduced at a younger age than those from Sydney Harbour. The life span of H. whitei is at least 5 years in the wild with six individuals recorded reaching this age. Data collected on breeding pairs found that H. whitei displays life-long monogamy with three pairs observed remaining pair bonded over three consecutive breeding years. Baseline population densities were derived for two Port Stephens' sites (0Â·035 and 0Â·110 mâ2) and for Manly in Sydney Harbour (1Â·050 mâ2). Even though the life-history parameters of H. whitei suggest it may be reasonably resilient, precaution should be taken in its future management as a result of its limited geographical distribution and increasing pressures from anthropogenic sources on its habitats.
Voyer, M, Gladstone, W & Goodall, H 2012, 'Methods of social assessment in Marine Protected Area planning: Is public participation enough?', Marine Policy, vol. 36, pp. 432-439.View/Download from: Publisher's site
Addressing social and economic considerations is crucial to the success of Marine Protected Area (MPA) planning and management. Ineffective social assessment can alienate local communities and under- mine the success of existing and future MPAs. It is rare to critique the success of methods used currently to incorporate social and economic considerations into MPA planning. Three Australian MPA planning processes covering three states and incorporating federal and state jurisdictions are reviewed in order to determine how potential social impacts were assessed and considered. These case studies indicate that Social Impact Assessment (SIA) is under-developed in Australian MPA planning. Assessments rely heavily on public participation and economic modelling as surrogates for dedicated SIA and are followed commonly by attitudinal surveys to gauge public opinion on the MPA after its establishment. The emergence of issues around public perception of the value of MPAs indicates the failure of some of these proposals to adequately consider social factors in planning and management. This perception may have potential implications for the long term success of individual MPAs. It may also compromise Australia's ability to meet international commitments for MPA targets to gazette at least 10% of all its marine habitats as MPAs. Indeed, this is demonstrated in two of the three case studies where social and economic arguments against MPAs have been used to delay or block the future expansion of the MPA network.
Courtenay, G, Gladstone, W, Scammell, M, Kidson, R & Wood, J 2011, 'The influence of estuarine water quality on cover of barnacles and Enteromorpha spp.', Environmental Monitoring and Assessment, vol. 175, no. 1-4, pp. 685-697.View/Download from: Publisher's site
The influence of ambient water quality on the settlement of barnacles and the green alga Enteromorpha spp. to an artificial substratum in the estuaries of Sydney, Australia, was investigated to test the efficacy of both groups of organisms as indicators of changes in water quality due to urban stormwater runoff and/or sewage overflows. Wooden settlement panels were immersed for 4 months on 17 occasions between 1996 and 2005 at 11 locations known to vary in water-quality parameters (conductivity, total uncombined ammonia, oxidised nitrogen, total nitrogen, filterable phosphorus, total phosphorus, faecal coliforms and chlorophyll-a) and ambient meteorological conditions (total rainfall, maximum rainfall). Water-quality data were collected during the time that the settlement panels were deployed. Cover of barnacles was highly variable among locations (range 1.255.2%). Hierarchical partitioning found that chlorophyll-a, total phosphorus and total nitrogen had significant independent positive effects on barnacle cover. Together, these variables explained 26% of the variation in barnacle cover. Mean cover of Enteromorpha spp., however, did not vary significantly among locations suggesting that other potentially more important factors are influencing its settlement and growth. The results of this study suggest that barnacle cover is likely to be a useful indicator of some components of water quality.
Morton, JK & Gladstone, W 2011, 'Spatial, temporal and ontogenetic variation in the association of fishes (family Labridae) with rocky-reef habitats', Marine and Freshwater Research, vol. 62, no. 7, pp. 870-884.View/Download from: Publisher's site
Habitat variability is an important factor structuring fish assemblages of rocky reefs in temperate Australia. Accepting the generality of this model requires that habitat-related variation is consistent through time, across multiple spatial scales, and applies to all life-history stages. We used repeated underwater visual surveys at multiple spatial scales over a 22-month period to test whether three distinct rocky-reef habitats had different wrasse assemblages and whether these assemblages were subject to spatial, temporal and ontogenetic variability. Overall, the strongest and most consistent habitat association was with sponge gardens, which had the most distinct assemblage, and the greatest species richness and density of individuals. Habitat associations in fringe and barrens were less consistent. A substantial increase in the abundance of small individuals, coinciding with warmer sea temperatures, contributed to temporal fluctuations in the density of wrasses. Overall, habitats were not strongly partitioned among larger individuals of the most abundant species, suggesting that adults are largely habitat generalists whereas small, recruiting individuals showed greater habitat specialisation. The present study emphasises the importance of incorporating spatial, temporal and ontogenetic variability into surveys of fish assemblages to understand more fully the dynamics of temperate rocky-reef systems
Powter, DM, Gladstone, W & Platell, ME 2010, 'The influence of sex and maturity on the diet, mouth morphology and dentition of the Port Jackson shark, Heterodontus portusjacksoni', Marine and Freshwater Research, vol. 61, no. 1, pp. 74-85.View/Download from: Publisher's site
Dietary studies are essential for an understanding of elasmobranch ecology and their role in marine ecosystems. The diet, head morphology and dentition of Heterodontus portusjacksoni, an abundant, epibenthic shark in the coastal waters of temperate eastern Australia, were examined in 20042005. The stomach contents of the juvenile, subadult and adult stages of 136 males and 100 females were examined. Diets were broad (32 prey taxa), but dominated by molluscs, teleosts and cephalopods. Analyses of stomach contents data demonstrated that diet differed significantly by ontogenetic stage, but not by sex. Juveniles and subadults consumed mainly benthic infauna and epifauna, with subadults ingesting greater amounts of diogenid crustaceans, and adult diets dominated by demersal/pelagic prey. Trophic level differed ontogenetically, from secondary consumers as juveniles and subadults to tertiary consumers as adults. The mainly tricuspidate juvenile dentition changed with maturity to a greater proportion of large molariform distal teeth, whereas the snout and jaw lengthened and broadened. Adult males retained a greater proportion of anterior S-family teeth than females, which was most likely related to copulation. The ontogenetic variation in dietary composition, facilitated by differences in dentition and mouth morphology, demonstrated that dietary resources were partitioned ontogenetically.
Powter, DM & Gladstone, W 2009, 'Habitat-mediated use of space by juvenile and mating adult Port Jackson sharks, Heterodontus portusjacksoni, in Eastern Australia', Pacific Science, vol. 63, no. 1, pp. 1-14.View/Download from: Publisher's site
Studies of spatial ecology of demersal sharks are critical to understanding the significance of habitat variation; however, limited information exists. Spatial ecology of adult Heterodontus portusjacksoni was studied at three locations on the central and southern coast of New South Wales, Australia, from January 2002 to December 2005. Juveniles within a nursery area were studied from December 2002 to December 2005. Tag-recapture, day and night underwater visual census, and acoustic tagging were used. Adults returned annually to the same coastal breeding reefs for up to four consecutive years. Individual juveniles resided within a sea-grass nursery area for at least 2 yr and were not uniformly distributed throughout the nursery. Adult females often sheltered in aggregations in gutters as a male avoidance strategy, and both sexes utilized the sand/reef interface in the absence of gutters. Juveniles aggregated infrequently due to absence of habitat features that mediated aggregation. Acoustic tracks of adults revealed periods of inactivity up to 27 hr. Juveniles spent significant amounts of time inactive, punctuated with short bouts of swimming. Juveniles utilized moderate activity spaces (3,510-583,990 m^sup 2^) centered over a core area of the sea-grass bed but also ranged over much larger areas of the bay. Use of space by H. portusjacksoni is strongly influenced by habitat characteristics throughout its life history.
Shokri, MR & Gladstone, W 2009, 'Higher taxa are effective surrogates for species in the selection of conservation reserves in estuaries', Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 19, no. 6, pp. 626-636.View/Download from: Publisher's site
1. The lack of information about marine biodiversity is problematic for the selection of conservation reserves that aim to protect representative samples of biodiversity. A number of surrogate measures for biodiversity have been suggested as a potential solution to this problem. 2. The present study tested the effectiveness of using higher taxa of macroinvertebrates as a surrogate for species-level identification to depict spatial variation in species richness and assemblage variation and to select conservation reserves in one estuary in south-east Australia. 3. Spatial patterns of richness and assemblage variation for species were significantly correlated with patterns defined from genera, families, orders, classes, and phyla with a decline in the magnitude of correlation coefficients from finer to coarser resolutions. A network of reserves selected to include representatives of all phyla, classes, orders, families and genera coincidentally included 54%, 61.7%, 75%, 92.6%, 98.8% species in 8.3%, 13.9%, 17.7%, 44.4% and 58.3% of grid cells, respectively. However, only reserves selected for genera, families and orders performed significantly better than random selection. 4. Percentage of species represented by orders, families and genera in a realistic level of available grid cells for conservation (i.e. 13.9%) were very close ranging between 70 and 73.5%. A factor diminishing the performance of order as surrogate for species richness was related to the difficulty of identifying many macroinvertebrates to the order level. Therefore, it is concluded that genus- and family-level identification is an effective surrogate for species-level identification for conservation planning in estuaries. Copyright © 2008 John Wiley & Sons, Ltd.
Shokri, MR, Gladstone, W & Jelbart, J 2009, 'The effectiveness of seahorses and pipefish (Pisces: Syngnathidae) as a flagship group to evaluate the conservation value of estuarine seagrass beds', Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 19, no. 5, pp. 588-595.View/Download from: Publisher's site
1. Syngnathids (Pisces, Syngnathidae: seahorses and pipefish) were investigated for their use as a flagship group to evaluate the conservation value of estuarine seagrass beds in estuaries in south-east Australia. Some species of syngnathids are listed internationally as vulnerable or endangered, and they are a charismatic group of fish that attracts a high level of public support and sympathy. Syngnathids are also protected in several states of Australia. Conservation of syngnathids might provide coincidental benefits to other species that share their habitats. 2. The effectiveness of syngnathids as a flagship group was assessed by (1) testing for correlations with other fish in species richness, density, assemblage variation, and summed irreplaceability value, and (2) determining the number of species of all other fish coincidentally captured in marine protected areas (MPAs) selected for syngnathids. The study was undertaken in a single estuary (scale: tens of square kilometres) and across multiple estuaries (scale: hundreds of square kilometres). 3. Densities of syngnathids and other fish were correlated only at the scale of multiple estuaries. Species richness and summed irreplaceability of syngnathids and other fish were not spatially correlated. Spatial variations in assemblages of syngnathids and other fish were correlated. MPAs selected for syngnathids included more non-syngnathid species than a random selection of locations. 4. This study provides evidence that ranking the conservation value of seagrass beds on the basis of the density and assemblage variation of syngnathids, and selecting MPAs to represent syngnathid species, will simultaneously benefit other fish. Synganthids are therefore regarded as a useful flagship group for conservation planning.
Shokri, MR, Gladstone, W & Kepert, A 2009, 'Annelids, arthropods or molluscs are suiable as surrogate taxa for selecting conservation reserves in estuaries', Biodiversity and conservation, vol. 18, no. 5, pp. 1117-1130.View/Download from: Publisher's site
The urgent need to conserve aquatic biodiversity and the lack of spatial data on biodiversity has motivated conservation planners and researchers to search for more readily obtainable information that could be used as proxies or surrogates. The surrogate taxon approach shows promise in some aquatic environments (e.g. intertidal) but not others (e.g. coral reefs, temperate rocky reefs). Estuaries are transitional environments at the landsea junction with a unique biodiversity, but are the most threatened of aquatic environments because of high levels of human use. The comparatively small numbers of conservation reserves means that estuarine biodiversity is poorly protected. Selecting additional conservation reserves within estuaries would be facilitated by the identification of a suitable surrogate that could be used in conservation planning. In one estuary in Southeast Australia, we evaluated separately the effectiveness of annelids, arthropods, and molluscs as surrogates for predicting the species richness, abundance, assemblage variation, and summed irreplaceability of other species and for coincidentally representing other species in networks of conservation reserves selected for each surrogate. Spatial patterns in the species richness and assemblage variation (but not summed irreplaceability) of each surrogate were significantly correlated with the spatial patterns of other species.
Chivers, WJ, Gladstone, W & Herbert, RD 2008, 'Spatial effects in an individual-based model of the interaction of species at different trophic levels', Natural Resource Modeling, vol. 21, no. 1, pp. 72-92.View/Download from: Publisher's site
In this paper, we describe an individual-based model of the interaction between a producer and herbivore species. The interaction occurs in a 2-dimensional matrix of individual cells. The producer organism grows in the cells and the herbivores move between the cells, towards areas of high concentration of producer. Herbivores may die of starvation or they may reproduce asexually. The model is not built to represent a specific existing system but is a parsimonious generalized model of producerherbivore interaction designed to test spatial effects.
Gladstone, W 2008, 'Towards conservation of a globally significant ecosystem: the Red Sea and Gulf of Aden', Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 18, no. 1, pp. 1-5.View/Download from: Publisher's site
The Red Sea and Gulf of Aden (RSGA) are renowned for their unique marine and coastal environments and species. An extreme pace of unmanaged development and a severe shortage of technical and conservation expertise threatened these globally important conservation values. Spurred to action, a period of intense activity in marine conservation, training and science by individual nations, the region, and the international donor community began in 1995. Many gains were made in marine environmental and resource management, however, this overview is con?ned to marine conservation. Marine conservation in the RSGA highlights the need for the most basic foundations to be laid by building political support and understanding, growing technical and management expertise, gathering relevant scienti?c information, and addressing the socioeconomic issues that threaten conservation values. The primary sources for much of the information presented here can be found in PERSGA (2006)
Momtaz, S & Gladstone, W 2008, 'Ban on commercial fishing in the estuarine waters of New South Wales, Australia: Community consultation and social impacts', Environmental Impact Assessment Review, vol. 28, no. 2-3, pp. 214-225.View/Download from: Publisher's site
In its effort to resolve the conflict between commercial and recreational fishers the New South Wales (NSW) government (NSW Fisheries) banned commercial fishing in the estuarine waters. The NSW Fisheries conducted a number of studies and held meetings with the affected communities including commercial fishers prior to the implementation of the ban. To investigate how community consultation played a role in the decision-making process especially as perceived by the commercial fishers and to determine actual social impacts of the ban on commercial fishers, in-depth interviews were conducted with the commercial fishers. This research reveals that despite the NSW Fisheries' consultations with commercial fishers prior to the closure, the latter were confused about various vital aspects of the decision. It further reveals that, the commercial fishers faced a number of significant changes as a result of this decision. We argue that a better decision-making process and outcome would have been possible through a meaningful consultation with the commercial fishers and a social impact assessment.
Morton, JK, Gladstone, W, Hughes, JM & Stewart, J 2008, 'Comparison of the life histories of three co-occurring wrasses (Teleostei: Labridae) in coastal waters of south-eastern Australia', Marine and Freshwater Research, vol. 59, no. 7, pp. 560-574.View/Download from: Publisher's site
Labrids are abundant on temperate rocky reefs yet their life histories are poorly known. Three co-occurring Australian labrids (Ophthalmolepis lineolatus, Notolabrus gymnogenis and Pictilabrus laticlavius) exhibited protogynous hermaphroditism typical of labrids. Juveniles reached sexual maturity at 184 mm total length (TL) (2.1 years) in O. lineolatus, 177 mm TL (1.8 years) in N. gymnogenis and <95 mm TL (<0.9 years) in P. laticlavius. Individuals were sexually active initial phase females until changing to a terminal phase male at 295 mm TL (5.2 years) in O. lineolatus, 273 mm TL (4.5 years) in N. gymnogenis and 138 mm TL (2.0 years) in P. laticlavius. The occurrence of males only at greater lengths and older ages suggests that O. lineolatus and N. gymnogenis are monandrous, whereas P. laticlavius appears to be diandrous. Reproduction was asynchronous among species with reproductive activity peaking in JanuaryMarch for O. lineolatus, AprilOctober for N. gymnogenis and OctoberDecember for P. laticlavius. Sectioned otoliths revealed that O. lineolatus and N. gymnogenis grew rapidly to 300 mm TL (6 years) and P. laticlavius to 180 mm TL (3 years). Longevity was at least 13.8, 9.6 and 4.8 years respectively. These life history data will aid management of these frequently harvested species.
Morton, JK, Platell, ME & Gladstone, W 2008, 'Differences in feeding ecology among three co-occurring species of wrasse (Teleostei: Labridae) on rocky reefs of temperate Australia', Marine Biology, vol. 154, no. 3, pp. 577-592.View/Download from: Publisher's site
The foraging behaviours and dietary compositions of three co-occurring labrids (Ophthalmolepis lineolatus, Notolabrus gymnogenis and Pictilabrus laticlavius), which are conspicuous on rocky reefs in temperate south-eastern Australia, were investigated between 2003 and 2005. SCUBA observations at two locations showed that the feeding intensity, and hence the associated effects of these fishes on rocky reef invertebrate prey, was temporally consistent. Relative differences in the contributions of ingested prey and use of different feeding microhabitats demonstrated that the feeding ecology differed significantly among the three species. Thus, O. lineolatus fed on proportionately higher volumes of polychaetes, polyplacophorans, marginellid gastropods (especially Austroginella sp.), bivalves and echinoids, which were sighted opportunistically in a wide selection of microhabitats, but particularly in sand/rubble. Ambush hunting was used regularly by smaller N. gymnogenis and all sizes of P. laticlavius to forage on amphipods, small decapods and small gastropods at algal bases or fronds and Diopatra dentata tubes. Amphipods were similarly important in the diet of smaller O. lineolatus.
Powter, DM & Gladstone, W 2008, 'Demographic analysis of the Port Jackson shark Heterodontus portusjacksoni in the coastal waters of eastern Australia', Marine and Freshwater Research, vol. 59, pp. 444-455.View/Download from: Publisher's site
Demographic analyses are used to assess the status and vulnerability of elasmobranchs but their accuracy is often affected by limited basic biological information. Although the Port Jackson shark Heterodontus portusjacksoni (Meyer) is currently not considered at threat, there is insufficient data for eastern Australia to assess this rigorously. The present study determined vital demographic rates of adult and juvenile H. portusjacksoni at four locations on the central and southern coast of New South Wales, Australia from January 2002 to December 2005 using underwater visual census, tagrecapture and samples obtained from a commercial fishery. Natural mortality was low in adults (0.0630.074 year1) and juveniles (0.225 year1), but substantial at the embryonic stage (0.7830.896 year1). Adult growth rates (31.432.7 mm year1) were slightly less than that of juveniles (36.837.5 mm year1). Males at both stages grew slightly faster than females. However, H. portusjacksoni had slower growth rates than many other elasmobranch species. Having a low intrinsic rate of increase (r = 0.069 year1), long generation times (µ1 = 22.5 year) and a low rebound potential, adults are the stage with the greatest impact on population growth. Hence, their life history strategy makes them susceptible to serious decline under exploitation, and management should strive to maintain the adult reproductive stock as a priority.
Powter, DM & Gladstone, W 2008, 'Embryonic mortality and predation on egg capsules of the Port Jackson shark Heterodontus portusjacksoni (Meyer)', Journal Of Fish Biology, vol. 72, no. 3, pp. 573-584.View/Download from: Publisher's site
Egg capsules of the Port Jackson shark Heterodontus portusjacksoni were examined during underwater visual census surveys at two sites in New South Wales, Australia, during the 20022005 reproductive seasons (austral winter). Embryonic mortality was high (0·7830·896 per annum) with the majority (99·2%) resulting from predation. The crested horn shark Heterodontus galeatus and common tent shell Astralium tentoriformis (Gastropoda, Turbinidae) were positively identified as egg predators. Gastropod predation was insignificant, accounting for only 2·0 and 2·1% of total mortality at Terrigal Haven and Dent Rock, respectively. Most capsules appeared to have been depredated by large predatory fishes with the eastern blue groper Achoerodus viridis (Labridae) and the black stingray Dasyatis thetidis (Dasyatidae) as possible candidate predators. The rate of embryonic mortality in H. portusjacksoni is higher than that reported for other oviparous elasmobranchs. This high level of mortality has significant consequences for the conservation and management of this species, especially when combined with an understanding of their low fecundity, late maturity and protracted reproductive life.
Powter, DM & Gladstone, W 2008, 'Habitat preferences of Port Jackson Sharks, Heterodontus portusjacksoni, in the coastal waters of Eastern Australia', Proceedings Of The Linnean Society Of New South Wales, vol. 129, pp. 151-165.
The habitat preferences of juvenile and adult Heterodontus portusjacksoni and ovipositing females were determined from three locations on the central and southern coast of New South Wales. Adults use shallow coastal rocky reefs in July-November for mating and oviposition, whilst juveniles occupy a seagrass nursery in a large coastal embayment. The sand/reef interface on the lee side of reefs was preferred by both sexes, probably as a refuge against strong water movements. Adult females also preferred rocky gutters when available, possibly as a male avoidance strategy. Preferred oviposition sites were narrow, shallow crevices (single capsules) or deep, narrow crevices (multiple capsules) which afforded protection against mechanical dislocation and/or predation. Juveniles exhibited a strong preference for the seagrass bed edge within a shallow nursery area. The visual complexity of this habitat combined with the juvenile's disruptive colouration may provide a refuge from predation, whilst proximity to the seagrass may provide ease of access for foraging. At a large scale, juveniles preferred areas of moderate slope within the nursery that provided protection from strong water movement. This study highlights the need for quantitative studies addressing habitat preferences and a consideration of use-specific factors to fully understand the selection of habitat by elasmobranchs
Powter, DM & Gladstone, W 2008, 'The reproductive biology and ecology of the Port Jackson shark Heterodontus portusjacksoni in the coastal waters of eastern Australia', Journal Of Fish Biology, vol. 72, no. 10, pp. 2615-2633.View/Download from: Publisher's site
The reproductive biology and ecology of the Port Jackson shark Heterodontus portusjacksoni was investigated at three locations on the central and southern coast of New South Wales (NSW), Australia from January 2002 to December 2005 using underwater visual census surveys and samples obtained from a commercial fishery. Adults displayed sexual dimorphism in total length (LT) at sexual maturity, with males maturing between 762 and 772 mm LT and females between 902 and 905 mm LT. The mean ovarian fecundity was estimated at 16 offspring per female but was unrelated to female LT. Male gonado-somatic (IG) and hepato-somatic (IH) indices and female IG declined from July to November as did maximum ovarian follicle diameter and the diameter of the three largest follicles. Adults were absent from inshore reefs between December and July. Hence, H. portusjacksoni has a synchronous annual breeding season in NSW, which occurs between July and November (the austral winter to spring), with a peak in oviposition from August to October. Heterodontus portusjacksoni copulatory and ovipository behaviour are reported for the first time. Copulation was observed and involved oral grasping of the females pectoral fin by a single male, which wrapped his body around hers to insert one clasper. Ovipositing females appeared to search crevices in the reef prior to delivering a single capsule, which was washed into the crevice by water movement, with the female departing very soon after oviposition. This study represents the first rigorously quantitative analysis of H. portusjacksoni reproductive biology and ecology in NSW waters
Chivers, WJ, Herbert, RD & Gladstone, W 2007, 'Within-generational and diversity-dependent effects in an individual-based model of predator-prey interaction', Natural Resource Modeling, vol. 20, no. 3, pp. 405-413.
In this paper we report the use of an individual-based model of predator-prey interaction to explore the effects of within generational and `between generational updating of a system level variable. We also report the importance of diversity within the simulated populations. Our findings support those of Grimm and Uchmánski  in regard to the importance of the timing of system level variables, and support Grimm and Uchmañski and others in regard to the importance of the level of diversity across the population. The significance of these findings is emphasized by the fundamental differences between our model and that of Grimm and Uchmánski in regard to the assumptions made about resource flow in the system.
Gladstone, W 2007, 'Requirements for marine protected areas to conserve the biodiversity of rocky reef fishes', Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 17, pp. 71-87.View/Download from: Publisher's site
This study describes spatial patterns in the biodiversity (species, assemblages) of rocky reef fishes at a spatial scale relevant to management, and compared the outcomes for this biodiversity from alternative procedures for selecting marine protected areas (MPAs) and from the selection of MPAs for fisheries-related objectives. 2. The study area included 104 species in two assemblage types; 36 species and 14 species occurred only in one or two locations respectively. 3. MPAs selected by hotspot richness, greedy richness complementarity, and summed irreplaceability included similar percentages of species and signi?cantly more species than randomly selected MPAs. A combined species-assemblage selection ensured representation of assemblage diversity. Representation of all species and assemblage types required 92% of locations. 4. MPAs chosen using density of all fishes or density of exploitable ?shes as selection criteria included fewer species (than MPAs selected using species identity) and the percentage of species accumulated did not di?er from a random selection. 5. Use of an established MPA as the seed for an expanded network was inefficient, leading to additional locations being required and an accumulation of species that did not di?er from a random selection. 6. The smallest MPA network that fulfilled multiple management objectives (representation of assemblage diversity and majority of species, population viability, support for fisheries, connectivity) required 30% of the surveyed locations
Gladstone, W 2007, 'Selection of a spawning aggregation site by Chromis hypsilepis (Pisces: Pomacentridae): habitat structure, transport potential, and food availability', Marine Ecology Progress Series, vol. 351, pp. 235-247.View/Download from: Publisher's site
Spawning aggregations form when fishes migrate to a site from their normal feeding grounds and form temporary groupings for breeding. Spawning aggregation sites are spatially rare, and demonstrating differences between a spawning aggregation site and unselected sites nearby is the first step towards understanding the benefits provided by the aggregation site. Chromis hypsilepis (Pomacentridae) is a demersally spawning reef fish, one population of which reproduces in a large, single aggregation at a rocky reef off the central coast of New South Wales, Australia. This study compared the habitat structure (rugosity, reef slope, substratum particle size, and abundance of preferred spawning microhabitat) of the spawning aggregation site and several non-spawning sites, and tested the hypotheses that the spawning aggregation site provided greater off-reef larval transport and prey availability for brooding males. Substratum rugosity was significantly greater and the preferred spawning microhabitat was significantly more abundant at the spawning aggregation site. Reef relief and substratum particle size were not significantly different from non-spawning sites. Passively drifting surface current drogues released at the spawning aggregation site were more rapidly transported off the reef, but did not travel further or faster, than drogues released at a non-spawning site over a 12 h period. Biomass of the preferred prey (copepods of 0.441 to 1.49 mm equivalent spherical diameter) was not significantly greater, but was less variable, at the spawning aggregation site
Gladstone, W 2007, 'Temporal patterns of spawning and hatching in a spawning aggregation of the temperate reef fish Chromis hypsilepis (Pomacentridae)', Marine Biology, vol. 151, no. 3, pp. 1143-1152.View/Download from: Publisher's site
Descriptions of temporal patterns in the reproduction of damselfishes (family Pomacentridae) and adaptive hypotheses for these patterns are derived mostly from studies of coral reef species. It is unclear whether the types of temporal patterns and the explanatory power of the adaptive hypotheses are applicable to damselfishes of temperate rocky reefs. This study tested hypotheses about the existence of lunar spawning cycles, the diel timing of hatching, and the synchronization of temporal patterns in hatching and tides in the schooling planktivorous damselfish Chromis hypsilepis on a rocky reef in New South Wales, Australia. Reproductive behaviour was observed daily for 223 days between August 2004 and March 2005. C. hypsilepis formed large spawning aggregations of 3,57533,075 individuals. Spawning occurred at a uniform rate throughout the day on a semi-lunar cycle. The greatest number of spawnings occurred 1 day after the new moon and 1 day before the full moon. The cost to males from brood care was an 85% reduction in their feeding rate. The semi-lunar spawning cycle may be an outcome of the use of the lunar cue to synchronize the aggregation for spawning of widely dispersed individuals and the need for males to recuperate after brooding. Eggs hatched 37 h after sunset following a 4.5-day incubation period. This study provides no support for hypotheses that link temporal patterns in hatching with particular tidal regimes believed to facilitate early survival of larvae and their dispersal. The result that hatching occurred over the tidal cycle was due to the rapid off-reef dispersal of larvae from the spawning ground at all stages of the tide. C. hypsilepis is similar to other planktivorous damselfishes in its semi-lunar spawning cycle, cost of brood care, and protracted diel spawning regime. It differs in its lengthy period of hatching and its breeding in spawning aggregations, believed to be rare among demersally spawning fishes.
Janes, AR, Gladstone, W & Hacking, NJ 2007, 'Australian sandy-beach ecosystems and climate change: ecology and management', Australian Zoologist, vol. 34, no. 2, pp. 190-201.
Despite their great socio-economic importance, sandy beaches have attracted little ecological research. This is unfortunate since, contrary to popular belief, they support diverse ecological assemblages whose species are mostly small and buried and which deserve protection as part of ecologically sustainable development (ESD). Moreover, the management of beaches and linked adjacent ecosystems is becoming increasingly important because of their vulnerability to burgeoning human pressures including climate change. Although there are large uncertainties involved, some of the climate-related environmental changes and their ecological consequences for sandy beaches are explored in this paper, some management issues discussed and research proposed.Temperature-related changes include the likelihood that the geographical ranges of some species will change, some cool-adapted species will decline in abundance, possibly to extinction, and the rate of processes such as decomposition and photosynthesis will increase. The increasing acidification of the ocean may affect many beach species directly via reduced calcification and indirectly via changes to the phytoplankton on which some beach species depend for food.
Malcolm, HA, Gladstone, W, Lindfield, S, Wraith, J & Lynch, TP 2007, 'Spatial and temporal variation in reef fish assemblages of marine parks in New South Wales, Australia - baited video observations', Marine Ecology Progress Series, vol. 350, pp. 277-290.View/Download from: Publisher's site
Baited remote underwater video stations (BRUVS) were used to examine variation in assemblages of reef fishes at scales of 100s of kilometres (between 3 marine parks in New South Wales, Australia) and kilometres (between 4 sites within each park). Temporal variation over 5 yr was also examined in 1 park (Solitary Islands). BRUVS were able to sample the relative abundance and distribution of species from a wide range of trophic groups, and were particularly effective for detecting cryptic predators. Significant variability in the fish assemblages occurred between each park consistent with the latitudinal distribution of the parks. Fish assemblages also varied significantly between sites within each park. Contrary to expectations, total species richness did not follow the expected latitudinal gradient. However, observed geographical patterns in species richness of certain families such as Labridae (greater richness in the most northern park) and Monacanthidae (greater species richness in southern parks) followed expectations. Abundant schooling species, common to all 3 parks, were important contributors to variation between sites. Temporal variation over 5 yr at 1 park was relatively minor compared to the spatial variation among the 3 parks. This suggests large-scale spatial separation is more important for structuring fish assemblages than time. A network of marine parks will therefore be required to represent variation in reef fish assemblages over this latitudinal scale.
Carraro, R & Gladstone, W 2006, 'Habitat preferences and site fidelity of the ornate wobbegong shark (Orectolobus ornatus) on rocky reefs of New South Wales', Pacific Science, vol. 60, no. 2, pp. 207-223.View/Download from: Publisher's site
Habitat and microhabitat preferences and site fidelity of Orectolobus ornatus were assessed between September 2002 and August 2003 to assess potential suitability of marine reserves for its conservation. Of six rocky reef habitats available in the study area (sponge gardens, artificial structures, barren boulders, sand, sea grass, macroalgae), O. ornatus exhibited a significant preference for sponge gardens, artificial structures, and barren boulders habitats. Habitat preferences of males and females, and individuals <1 m and >1 m, did not differ. Orectolobus ornatus selected daytime resting positions with a high topographic complexity and crevice volume and did not select on the basis of prey availability. Habitat and microhabitat preferences may be related to the need for predator avoidance. Regular monitoring of 40 individually identified O. ornatus revealed that none was a permanent resident of the study area. Seven individuals exhibited short-term temporary fidelity to the study area; they were resighted frequently for part of an intensive 100-day survey. Remaining individuals were temporary visitors; they were resighted at most once after initial identification or returning after extended absences. Monthly population surveys confirmed the turnover of O. ornatus in the study area. The lack of long-term site fidelity suggests that small marine reserves will be ineffective as a conservation strategy for O. ornatus.
Gladstone, W, Hacking, NJ & Owen, V 2006, 'Effects of artificial openings of intermittently opening estuaries on macroinvertebrate assemblages of the entrance barrier', Estuarine Coastal And Shelf Science, vol. 67, no. 4, pp. 708-720.View/Download from: Publisher's site
Gladstone, W, Stanger, R & Phelps, L 2006, 'A participatory approach to university teaching about partnerships for biodiversity conservation', Australian Journal of Environmental Education, vol. 22, no. 2, pp. 21-32.
Loss of biodiversity and habitats is one of the greatest threats to the environment and education has a critical role to play in addressing this issue. This paper describes a teaching activity for first-year university students studying sustainable resource management at the University of Newcastle which established a partnership between education, government and the community to rehabilitate a nature reserve where biodiversity values were threatened by weed invasion. Students research the problem (weed invasion), quantitatively assess the impacts of weed invasion and management interventions, and work alongside a community-based bushcare group and government agency during on-ground rehabilitation of the reserve. Key outcomes for students have been knowledge and skills relevant to a critical issue for the Australian environment; a more optimistic attitude towards environmental issues and their potential to develop solutions; a positive perspective about the role of community involvement; continued participation in community bushcare groups outside the classroom; and personal involvement in solving a critical environmental issue
Gladstone, W, Stanger, R & Phelps, L 2006, 'A participatory approach to university teaching about partnerships for biodiversity conservation', Australian Journal of Environmental Education, vol. 22, no. 2, pp. 21-31.
Boissonneault, MF, Gladstone, W, Scott, P & Cushing, N 2005, 'Grey nurse shark human interactions and portrayals: a study of newspaper portrayals of the grey nurse shark from 1969-2003', Electronic green journal, vol. 22, no. 1, pp. 1-15.
The article presents information on a study that consists of a content analysis of 41 Australian newspaper articles pertaining specifically to the grey nurse shark and serves to deconstruct the explicit messages that they attempt to convey to their readers. The data generated by this study exemplify the perceptions of Carcharias taurus as represented by major Australian newspapers between the years 1969 and 2003. The term agenda-setting refers to the creation of public awareness and concern for issues that are reported by the news media. The fundamental basis for research on agenda-setting is to recognize that the media is not a reflection of reality but rather filters and shapes reality, and the focus that the media places on specific issues leads the public to perceive "those" issues as more important than others. In a 1997 study entitled "Changing Attitudes Toward California Cougars," Jennifer R. Wolch and Unna Lassiter of the University of Southern California along with Andrea Gullo of the Mountains Recreation and Conservation Authority in Los Angeles analyzed the impact that the newspaper media had on attitudes and understandings that the public had developed towards the California Cougar.
Courtenay, GC, Gladstone, W & Schreider, M 2005, 'Assessing the reponse of estuarine intertidal assemblages to urbanised catchment discharge', Environmental Monitoring and Assessment, vol. 107, no. 1-3, pp. 375-398.View/Download from: Publisher's site
Measurement of intertidal rock assemblages was investigated as a potential biological indicator to provide a quantitative estimate of the impact of urbanised catchment discharge on the estuaries of Sydney, Australia, from 1995 to 1999. Based on the presence and characteristics of adjacent human activities, sampling locations were categorised as: Bush; Urban; Urban with Sewer Overflows; and Industry with Sewer Overflows. In Sydney Harbour, variation in assemblage structure was measured between most impact categories, however differences between impact categories were not consistent for each year. Nevertheless, in years of above average rainfall (19981999), reference assemblages adjacent to national parks and distant from urbanisation were different to all other putatively impacted assemblages.
Gladstone, W & Alexander, T 2005, 'A test of the higher-taxon approach in the identification of candidate sites for marine reserves', Biodiversity and conservation, vol. 14, no. 13, pp. 3151-3168.View/Download from: Publisher's site
Alternatives to species-level identification have been advocated as one solution to the problem of selecting marine reserves with limited information on the distribution of marine biodiversity.This study evaluated the effects on selection of candidate sites for marine reserves from using the higher-taxon approach as a surrogate for species-level identification of intertidal molluscs and rocky reef fishes. These effects were evaluated by determining the percentage of species included in candidate reserves identified from genus-, family- and order-level data by a complementarity-based reserve selection algorithm, and by testing for correlations between the irreplaceability values of locations. Candidate reserves identified from genus- and family-level data of intertidal molluscs included a similar percentage of all species as the reserves identified from species-level data. Candidate reserves selected from genus- and family-level data of rocky reef fishes included, respectively, 37% and 1423% fewer species than reserves selected from species-level data.
Gladstone, W & davis, J 2003, 'Reduced survey intensity and its consequences for marine reserve selection', Biodiversity and conservation, vol. 12, no. 7, pp. 1525-1536.View/Download from: Publisher's site
There has been much interest in the potential of short-cuts in biodiversity surveys (e.g. physical surrogates, indicator groups, and lower taxonomic resolution) in systematic processes to select networks of representative marine reserves. This study tested the consequences for reserve selection of reducing survey intensity in intertidal rocky shores in southeast Australia. Using a reference data set of species'' distributions based on surveys of two replicate sites in each of 15 locations, a reduction in survey intensity was simulated by randomly eliminating the data from one of the replicate sites in each location. A complementarity-based reserve selection algorithm was used to determine the number of locations required to represent all species once in a reserve network and the irreplaceability value of locations. A reduction in survey intensity led to increases in: the size of reserve networks (of between 8 and 17%); the irreplaceability value of locations; and the number of irreplaceable locations. These changes were caused by a reduction in the observed range sizes of species in the data sets simulating a reduced survey intensity.
Gladstone, W & Schreider, M 2003, 'Effects of pruning a temperature mangrove forest on the associated assemblages of macroinvertebrates', Marine and Freshwater Research, vol. 54, pp. 683-690.View/Download from: Publisher's site
Mangrove forests around the world are being impacted by development in adjacent land and water areas. An after-control-impact study was undertaken to assess the effects of mangrove forest pruning on the associated benthic macroinvertebrate fauna. Pruning, undertaken 5 years before our sampling period, reduced the height of the forest canopy from 5 m to 1 m. Macrobenthic assemblages were sampled in September 2000 and January 2001 from two randomly selected sites within the pruned section of forest, and two sites in each of two control locations in the same forest. Assemblage composition in the pruned and undisturbed mangrove forests was not significantly different, nor were there significant differences in variability between the two areas. Similarity matrices for assemblages based on higher taxonomic groups and molluscs were highly correlated with similarity matrices for all taxa, indicating the utility of more rapid forms of assessment in this habitat. The results suggest that although short-term impacts may have occurred, no impact on macroinvertebrate assemblages was evident 5 years after the pruning.
Gladstone, W, Krupp, F & Younis, M 2003, 'Development and management of a network of marine protected areas in the Red Sea and Gulf of Aden region', Ocean & Coastal Management, vol. 46, pp. 741-761.View/Download from: Publisher's site
Gladstone, W 2002, 'Fisheries of the Farasan Islands (Red Sea)', Naga, WorldFish Center Quarterly, vol. 25, pp. 30-34.
Gladstone, W 2002, 'The Regional Organization for the Conservation of the Environment of the Red Sea and Gulf of Aden'.
Gladstone, W & Fisher, PR 2000, 'Status and ecology of cetaceans in the Farasan Islands Marine Protected Area (Red Sea)', Fauna of Arabia, vol. 18.
Gladstone, W, Tawiq, N, Nasr, D, Andersen, I, Cheung, C, Drammeh, H, Krupp, F & Lintner, S 1999, 'Sustainable use of renewable resources and conservation in the Red Sea and Gulf of Aden: issues, needs and strategic actions', Ocean & Coastal Management, vol. 42, pp. 671-697.View/Download from: Publisher's site
Gladstone, W 1996, 'Unique annual aggregation of longnose parrotfish (Hipposcarus harid) at Farasan Island (Saudi Arabia, Red Sea)', Copeia, vol. 1996, no. 2, pp. 483-485.
Gladstone, W 1994, 'Lek-like spawning, parental care and mating periodicity of the triggerfish Pseudobalistes flavimarginatus (Balistidae)', Environmental Biology Of Fishes, vol. 39, pp. 249-257.View/Download from: Publisher's site
Gladstone, W 1992, 'Observations of Crown-of-thorns starfish spawning', Marine and Freshwater Research, vol. 43, pp. 535-537.
St John, J, Russ, G & Gladstone, W 1990, 'Accuracy and bias of visual estimates of numbers, size structure and biomass of a coral reef fish', Marine Ecology Progress Series, vol. 64, no. 1, pp. 253-262.
STROUD, GJ, GOLDMAN, B & GLADSTONE, W 1989, 'LARVAL DEVELOPMENT, GROWTH AND AGE-DETERMINATION IN THE SHARPNOSE PUFFERFISH CANTHIGASTER-VALENTINI (TELEOSTEI, TETRAODONTIDAE)', JAPANESE JOURNAL OF ICHTHYOLOGY, vol. 36, no. 3, pp. 327-337.View/Download from: Publisher's site
Stroud, GJ, Goldman, B & Gladstone, W 1989, 'Laval development, growth and age determination in the Sharpnose Pufferfish Canthigaster valentini (Teleostei: Tetraodontidae)', Japanese Journal of Ichthyology, vol. 36, no. 3, pp. 327-337.
Gladstone, W 1988, 'Killer whale feeding observed underwater', Journal of Mammalogy, vol. 69, pp. 629-630.
Gladstone, W & Rotem, A 1988, 'Movements in the enrolled nurse workforce in New South Wales: results of a survey', Australian Health Review, vol. 11, pp. 110-121.
Gladstone, W & Westoby, M 1988, 'Growth and reproduction in Canthigaster valentini (Pisces, Tetraodontidae): a comparison of a toxic reef fish with other reef fishes', Environmental Biology Of Fishes, vol. 21, pp. 207-222.View/Download from: Publisher's site
Gladstone, W 1987, 'Role of female territoriality in social and mating systems of Canthigaster valentini (Pisces: Tetraodontidae): evidence from field experiments', Marine Biology, vol. 96, pp. 185-191.View/Download from: Publisher's site
Sharpnose puffers, Canthigaster valentini (Pisces: Tetraodontidae) at Lizard Island, Australia, live in made-dominated haremic social and mating systems. The hypothesis was that mature females are restricted in their movements and can be monopolized by some males. Field experiments at Lizard Island, Great Barrier Reef, between January and March 1983 showed that mature females were still territorial in the absence of males and movements of females were not controlled by males. Males abandoned their territories when their females were removed. The territorial behavior of those males with access to females (territorial males) restricted the access of other males (bachelor males) to them. Bachelor males took over harems and became territorial males when established territorial males were removed. The results of the experiments thus supported the hypothesis.
GLADSTONE, W 1987, 'THE COURTSHIP AND SPAWNING BEHAVIORS OF CANTHIGASTER-VALENTINI (TETRAODONTIDAE)', ENVIRONMENTAL BIOLOGY OF FISHES, vol. 20, no. 4, pp. 255-261.
Gladstone, W 1987, 'The courtship and spawning behaviors of Cunthigaster valentini (Tetraodontidae)', Environmental Biology Of Fishes, vol. 20, pp. 225-261.
Gladstone, W 1987, 'The eggs and larvae of the sharpnose pufferfish Canthigaster valentini (Pisces Tetraodontidae) are unpalatable to other reef fishes', Copeia, vol. 1987, pp. 227-230.
Gladstone, W, Webster, IW & Rotem, A 1987, 'An initiative for teaching about alcohol and other drugs in Australian medical schools', Medical Journal of Australia, vol. 147, pp. 339-341.
Gladstone, W 1986, 'Spawning behavior of the Bumphead Parrotfish Bolbometopon muricatum at Yonge Reef, Great Barrier Reef', Japanese Journal of Ichthyology, vol. 33, pp. 326-328.
Gladstone, W 1981, 'Early medical photography in America (1839--1883); VI. Civil war medical photography.', New York State Journal of Medicine, vol. 81, no. 1.
Voyer, M, Dreher, TI, Gladstone, W & Goodall, H 2013, 'Dodgy Science or Global Necessity? Local Media Reporting of Marine Parks' in Lester, L & Hutchins, B (eds), Environmental Conflict and the Media, Peter Lang Publishing, New York, USA, pp. 153-168.
Has the hype associated with the «revolutionary» potential of the World Wide Web and digital media for environmental activism been muted by the past two decades of lived experience? What are the empirical realities of the prevailing media landscape? Using a range of related disciplinary perspectives, the contributors to this book analyze and explain the complicated relationship between environmental conflict and the media. They shine light on why media are central to historical and contemporary conceptions of power and politics in the context of local, national and global issues and outline the emerging mixture of innovation and reliance on established strategies in environmental campaigns. With cases drawn from different sections of the globe Australia, the United Kingdom, the United States, Europe, Latin America, China, Japan, the Pacific Islands, Africa the book demonstrates how conflicts emanate from and flow across multiple sites, regions and media platforms and examines the role of the media in helping to structure collective discussion, debate and decision-making.
Gladstone, W 2010, 'Reef fishes' in Standard Survey Methods for Key Habitats and Key Species in the Red Sea and Gulf of Aden, Regional Organization for the Conservation of the Environment of the Red Sea and Gulf of Aden, Jeddah, pp. 143-206.
All major coastal ecosystems in the tropics are being degraded. The problems include losses of biodiversity, reduced ecosystem functions, and costs to coastal human societies. Declines in species' abundances, and habitat loss and modification are the result of the demands for aquaculture, port construction, trawling, excessive nutrient loads, overfishing and collecting, sedimentation from catchment activities, invasive species, and climate change. A global response to these changes has been conservation and management approaches that aim to reduce, reverse, and prevent unnatural changes and address their underlying causes. Successes in conservation and management are likely when actions are designed to achieve the fundamental ecological goals of ensuring resilience, maintaining ecosystem connectivity, protecting water quality, conserving species-at-risk, conserving representative samples of species and assemblages, and managing at the appropriate spatial scale. Achieving societal aspirations for coastal ecosystems requires that management approaches address the socio-economic aspects of issues and include stakeholder consultation, participation, and education. Achieving long-term success in conservation and management requires coastal nations to address fundamental issues such as lack of information for management decision-making, population growth and poverty, limited technical and management capacity, poor governance, lack of stakeholder participation, the mismatches between the issue and the geographic scale of management, lack of an ecosystem perspective, ineffective governance and management, and a lack of awareness of the effects of human activities. © 2009 Springer Science+Business Media B.V.
Gladstone, W 2009, 'Conservation and management of tropical coastal ecosystems' in Nagelkerken, I (ed), Ecological Connectivity among Tropical Coastal Ecosystems, Springer, Dordrecht, the Netherlands, pp. 565-605.View/Download from: Publisher's site
All major coastal ecosystems in the tropics are being degraded. The problems include losses of biodiversity, reduced ecosystem functions, and costs to coastal human societies. Declines in speciesï½ abundances, and habitat loss and modi?cation are the result of the demands for aquaculture, port construction, trawling, excessive nutrient loads, over?shing and collecting, sedimentation from catchment activities, invasive species, and climate change. A global response to these changes has been conservation and management approaches that aim to reduce, reverse, and prevent unnatural changes and address their underlying causes. Successes in conservation and management are likely when actions are designed to achieve the fundamental ecological goals of ensuring resilience, maintaining ecosystem connectivity, protecting water quality, conserving species-at-risk, conserving representative samples of species and assemblages, and managing at the appropriate spatial scale. Achieving societal aspirations for coastal ecosystems requires that management approaches address the socio-economic aspects of issues and include stakeholder consultation, participation, and education
Chivers, WJ, Gladstone, W & Herbert, RD 2020, 'Spatial effects in an individual-based model of the interaction of species at different trophic levels', MODSIM 2005 - International Congress on Modelling and Simulation: Advances and Applications for Management and Decision Making, Proceedings, pp. 325-331.
© MODSIM 2005 - International Congress on Modelling and Simulation: Advances and Applications for Management and Decision Making, Proceedings. All rights reserved. A spatial individual-based model of producer-consumer interaction is described. The model includes a two-dimensional grid of cells in which a producer organism grows according to a logistic equation, and individual herbivores which move towards cells high in producer biomass to consume the producer. Herbivores die of starvation if their energy reserve is too low or they may reproduce asexually if they have eaten sufficiently. The individuals in the model are the herbivores and the matrix cells-the producers are represented only as an attribute of the individual cells. The model was built as simply as possible with parsimonious producer-consumer interaction and consumer behavior. In this paper we consider spatial effects in the model. We test the effect of three independent variables: a) the distance over which the herbivores may move per time step, b) a torus matrix compared with an edged matrix and c) the size of the space matrix. We also comment on the inclusion of space itself into the model algorithm. The effect of the three independent variables on population size is tested by using a 3-factor ANOVA for herbivore and producer populations. The model is executed ten times for each of 18 combinations of levels of the three factors. We find a significant Distance × Edge × Matrix interaction for the herbivores. The variation in population among the three matrix sizes at each move distance differed depending on whether an edge was present or not. For the producers the ANOVA showed a significant Distance × Matrix interaction which arose because the variation in population among the three matrix sizes was not consistent across the three move distances. The effects of two factors were clearly evident in the graphical display of the model, but not highly significant in the statistical procedure. The effect ...
Kabir, SZ, Momtaz, S & Gladstone, W 2010, 'The quality of Environmental Impact Statement (EIS) in Bangladesh', IAIA10 Conference Proceedings, 30th Annual Meeting of the International Association for Impact Assessment, IAIA International Headquarters, Geneva.
Shokril, MR, Gladstone, W & Kepert, A 2007, 'Selection of Marine Protected Areas for conserving estuaries using surrogate approach', Oceans Conference Record (IEEE).View/Download from: Publisher's site
Establishing marine protected areas in estuaries has been advocated as the efficient route in conserving the sensitive estuarine environment. However, selecting priority areas for conservation of estuarine biodiversity require detailed biodiversity inventories that are difficult to access. A potential solution is the use of surrogates that are readily measured and reflect the total biodiversity. Indicator groups and higher taxa are widely suggested as potential surrogates in establishing conservation areas. The performance of indicator groups and higher taxa as surrogates were assessed in one estuary in south-east Australia by traditional approach "correspondence in species richness" and using complementarity-based approaches "correspondence in compositional dissimilarity and coincidental representation of target species in simulated MPA for surrogates". Of 16 taxa examined, annelids, arthropods and molluscs were identified as reliable surrogates in representing biodiversity of target species. This study showed that genus-level data of indicator taxa could efficiently identify priority areas for target species. Family-level data of indicator taxa may be used as surrogate with caution. Given wide differences among aquatic habitats, there is a special need for finding indicator groups for different habitats. ©2007 MTS.
Chivers, WJ, Gladstone, W & Herbert, RD 2005, 'Spatial effects in an individual-based model of the interaction of species at different trophic levels', Proceedings of MODSIM 2005 Conference, International Congress on Modelling and Simulation, Modelling and Simulation Society of Australia and New Zealand, Canberra.
Chivers, WJ, Herbert, RD & Gladstone, W 2004, 'Heterogeneous resource partitioning in a generalized individual-based model of multi-species interaction', Proceedings of MODSIM 2003, International Congress on Modelling and Simulation, Modelling and Simulation Society of Australia and New Zealand, Canberra.
Jones, A, Gladstone, W & Hacking, N 2004, 'Sandy-Beach Ecosystems and Climate Change: Potential Ecological Consequences and Management Implications', Proceedings of Coast to Coast 2004, Department of Primary Industries Water and Environment, Hobart.
Gladstone, W & Fisher, PR 1999, 'Status of cetaceans in the Farasan Islands Marine Protected Area (Red Sea)', Annual Conference, European Cetacean Society, European Cetacean Society, Spain.
Gladstone, W 1997, 'Trace metal levels from the Torres Strait Baseline Study', Fly River Discharge Workshop, Australian Institute of Marine Science, Townsville.
Gladstone, W & McGrath, V 1995, 'Trace metals in the traditional seafoods of the Torres Strait', The State of the Marine Environment Conference, Australia Technical Department of the Environment, Sport and Territories, Brisbane.
Brodie, JE, Dight, IJ & Gladstone, W 1994, 'Metal concentrations in marine sediments and biota from the Torres Strait: preliminary results from the Tores Strait Baseline Study', PACON 94, James Cook University, Townsville.
Gladstone, W 1994, 'The Farasan Islands - biological resources, conservation status, human uses and impacts - a basis for management.', Joint Scientific Conference, Australian Marine Sciences Association/Australian Coral Reef Society/International Society for Reef, Townsville.
Gladstone, W 1994, 'The Farasan marine environment: biological resources, conservation status and human use', Symposium on the Red Sea Marine Environment, Jeddah, Saudi Arabia, King Abdulaziz University, Jeddah, Saudi Arabia.
D, L & Gladstone, W 1993, 'The Torres Strait Baseline Study', Institute of Marine Science/National Science Foundation Workshop 'Influence of Tropical Rivers on Coastal Oceanographic Processes', Australian Institute of Marine Science/National Science Foundation, Townsville.
Gladstone, W 1993, 'The history of crown-of-thorns starfish controls on the Great Barrier Reef and an assessment of future needs for controls', Management Options and the Future of the COTS Program, Great Barrier Reef Marine Park Authority, Australia.
Gladstone, W 1993, 'Trace metal levels in the Torres Strait marine environment', Torres Strait Island Coordinating Council Workshop 'A Marine Strategy for the Torres Strait', Torres Strait Island Coordinating Council, Thursday Island.
Gladstone, W 1992, 'The history, current status and future possibilities of controlling crown-of-thorns starfish', Crown-of-Thorns Starfish Research Committee/Great Barrier Reef Marine Park Authority Workshop 'The Possible Causes and Consequences of Outbreaks of Crown-of-Thorns Starfish', Great Barrier Reef Marine Park Authority, Townsville.
Gladstone, W 1992, 'The Torres Strait Baseline Study: monitoring for possible effects of mining operations in the Fly River catchment area on the Torres Strait marine environment', 7th International Coral Reef Symposium, University of Guam Marine Laboratory, Guam.
Lassig, BR, Gladstone, W, Moran, P & Engelhardt, U 1992, 'A crown-of-thorns starfish Contingency Plan', 7th International Coral Reef Symposium, University of Guam Marine Laboratory, Guam.
Lassig, BR, Gladstone, W, Moran, P & Engelhardt, U 1992, 'A crown-of-thorns starfish Contingency Plan.', Crown-of-Thorns Starfish Research Committee/Great Barrier Reef Marine Park Authority Workshop 'The Possible Causes and Consequences of Outbreaks of Crown-of-Thorns Starfish', Great Barrier Reef Marine Park Authority, Townsville.
Gladstone, W 1991, 'Crown-of-thorns spawning', Crown-of-Thorns Starfish Research Committee/Great Barrier Reef Marine Park Authority Workshop 'Reproduction, Recruitment and Hydrodynamics in the Crown-of-Thorns Phenomenon', Great Barrier Reef Marine Park Authority, Townsville.
Gladstone, W 1990, 'Mating system and spawning periodicity in triggerfish', Annual Conference, Australian Coral Reef Society, Australian Coral Reef Society, Townsville.
Gladstone, W 1988, 'Correlates and possible costs of reproductive success in males of a haremic coral reef fish.', 6th International Coral Reef Symposium, Reefbase, Townsville.
Gladstone, W 1988, 'Juvenile survivorship in a brooding coral reef fish: variability from incomplete and complete experiments', Ecological Society of Australia Workshop "Variability in Populations, Communities and Ecosystems",, Ecological Society of Australia, Sydney.
Gladstone, W 1987, 'Reproductive success in a coral reef fish: variability and costs', Annual Conference, Australian Coral Reef Society, Australian Coral Reef Society, Sydney.
Gladstone, W 1987, 'Variations in the life history of Canthigaster valentini (Tetraodontidae) at Lizard Island.', Annual Conference, Australian Society for Fish Biology, Australian Society for Fish Biology, Canberra.
Gladstone, W 1984, 'Mating system and reproductive success of the sharpnose pufferfish, Canthigaster valentini, at Lizard Island, Great Barrier Reef.', Annual Conference, Ecological Society of Australia, Ecological Society of Australia, Sydney.
Stroud, GJ, Gladstone, W, Goldman, B & Talbot, FH 1983, 'Development, growth and age determination of the sharpnose pufferfish Canthigaster valentini (Pisces: Tetraodontidae).', Annual Conference, Australian Society for Fish Biology, Australian Society for Fish Biology, Narrandera.