Cadotte, MW, Hamilton, MA & Murray, BR 2009, 'Phylogenetic relatedness and plant invader success across two spatial scales', Diversity And Distributions, vol. 15, no. 3, pp. 481-488.View/Download from: Publisher's site
Successful invaders often possess similar ecological traits that contribute to success in new regions, and thus under niche conservatism, invader success should be phylogenetically clustered. We asked if the degree to which non-native plant species are phylogenetically related is a predictor of invasion success at two spatial scales. Australia - the whole continent and Royal National Park (south-eastern Australia). We used non-native plant species occupancy in Royal National Park, as well as estimated continental occupancy of these species from herbarium records. We then estimated phylogenetic relationships using molecular data from three gene sequences available on GenBank (matK, rbcL and ITS1). We tested for phylogenetic signals in occupancy using Blomberg's K. Whereas most non-native plants were relatively scarce, there was a strong phylogenetic signal for continental occupancy, driven by the clustering of successful species in Asteraceae, Caryophyllaceae, Poaceae and Solanaceae. However, we failed to detect a phylogenetic signal at the park scale. Our results reveal that at a large spatial scale, invader success is phylogenetically clustered where ecological traits promoting success appear to be shared among close relatives, indicating that phylogenetic relationships can be useful predictors of invasion success at large spatial scales. At a smaller, landscape scale, there was no evidence of phylogenetic clustering of invasion success, and thus, relatedness plays a much reduced role in determining the relative success of invaders.
Harris, CJ, Murray, B, Hose, GC & Hamilton, MA 2007, 'Introduction history and invasion success in exotic vines introduced to Australia', Diversity And Distributions, vol. 13, no. 4, pp. 467-475.View/Download from: Publisher's site
The ecological damage caused by invasive vines poses a considerable threat to many natural ecosystems. However, very little data are available for this potentially environmentally destructive functional group in Australia. In order to address this paucity of information, we assembled the first inventory of exotic vines thathave become established in natural ecosystems across Australia. The influence that introduction history attributes, variables that relate to the introduction of a species to a new area, may have on the occurrence and distribution of exotic vines was also determined. We asked whether the continent of origin, reason for introduction and residence tiem related to the prevalence and distribution of exotic vines across Asutralia. A total of 179 exotic climbing plant species from 40 difference families were found to have become established across continental Australia. However, five families accounted for over 50% of thes species. Most exotic vines originated from South America and were introduced for ornamental purposes. The length of time in which an exotic vine had been present in tis new range was significantly related to its distribution, with a positive relationship found between residence time and area of occupancy across the continent. No other introduction history attribute was significantly related to the area of accup[ancy ro distribution of a species. This suggests that while the trends found among introduction history attributes are important in explaining the prevalence of exotic vines in Australia, opnly residence time is currently a useful predictor of their future success.
Hamilton, MA, Murray, B, Cadotte, MW, Hose, GC, Baker, AC, Harris, CJ & Licari, DD 2005, 'Life-history correlates of plant invasiveness at regional and continental scales', Ecology Letters, vol. 8, no. 10, pp. 1066-1074.View/Download from: Publisher's site
We implemented cross-species and independent-contrasts multiple regression models to compare life-history correlates of invasion success between regional and continental spatial scales among non-native plants of eastern Australia. We focussed on three li