Journal
FUNCTIONAL ECOLOGY
Volume 29, Issue 11, Pages 1475-1485Publisher
WILEY
DOI: 10.1111/1365-2435.12463
Keywords
adaptation; biological invasions; drought; ecological clines; evolution of increased competitive ability hypothesis; herbivory; invasion ecology; phenotypic plasticity; plant traits; Senecio pterophorus
Categories
Funding
- Ministerio de Ciencia e Innovacion (Spain) [GCL2008-02421/BOS]
- Ministerio de Economia y Competitividad (Spain) [GCL2011-29205]
- Generalitat de Catalunya (Catalonia) [2014 SGR-453]
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1. Divergence in plant traits and trait plasticity after invasion has been proposed as mechanisms favouring invasion success. Current hypotheses predict a rapid evolution in response to changes in the abiotic conditions in the area of introduction or to differences in the herbivore consumption pressure caused by a decrease in the enemies associated with the area of origin [e.g. evolution of increased competitive ability (EICA) hypothesis]. The importance of these factors in determining plant geographical divergence has not been yet simultaneously evaluated. 2.Senecio pterophorus (Asteraceae) is a perennial shrub native to eastern South Africa and a recent invader in western South Africa (since 100years ago), Australia (>70-100years) and Europe (>30years). These areas differ in their summer drought stress [measured as the ratio of summer precipitation to potential evapotranspiration (P/PET)] and their interactions with herbivores. 3. We performed a common garden experiment with S.pterophorus sampled throughout its entire known distributional area to determine (i) whether native and non-native populations diverge in their traits, as well as the plasticity of these traits in response to water availability and (ii) whether climate and herbivory play a role in the genetic differentiation across regions. 4. Plants from the non-native regions were smaller and had a lower reproductive output than plants from the indigenous area. No geographical differences in phenotypic plasticity were found in response to water availability. Herbivory was not related to the plant geographical divergence. In contrast, our results are consistent with the role of climate as a driver for postinvasive evolution, as suggested by adaptation of plants to a drought cline in the native range, the analogous change in plant traits in independently invaded regions and the convergence of vegetative traits between non-native plants and native plants under similar drought conditions. 5. Native and non-native populations of S.pterophorus differed in plant traits, but not in trait plasticity, in response to their local climatic conditions. Our results are contrary to the role of herbivory as a selective factor after invasion and highlight the importance of climate driving rapid evolution of exotic plants.
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