Is rapid evolution common in introduced plant species

摘要: Summary 1. While previous studies have demonstrated rapid evolution in introduced plants and animals, most focus on single species. They are therefore unable to show whether these special cases, or if is a common phenomenon species. 2. We used over 1900 herbarium specimens determine morphological traits [plant height, leaf mass per area (LMA), shape] shown significant change during the last ∼150 years 23 plant species New South Wales, Australia. 3. Seventy cent of our study showed at least one trait through time. The was height (eight out 21 species). Six decrease Decreases mainly occurred western Wales where dry, low nutrient conditions may favour shorter plants. We also found changes traits, including LMA, five shape, three area. magnitude surprisingly large, up 125% 100 years. 4. We both native Australian species, taken from their range investigate possibility that were response temporal environmental rather than species’ introduction Australia. These control significantly (P < 0.05) fewer included analyses information region which each specimen collected, account for time might be caused by populations radiating new environments different phenotype expressed. Overall, seems likely explanation we observed. 5. Synthesis. majority While garden experiments will required rule phenotypic plasticity as an alternative patterns, results suggest could much more common, greater previously thought.