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Breakdown of a geographic cline explains high performance of introduced populations of a weedy invader
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SYSNO ASEP 0495010 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Breakdown of a geographic cline explains high performance of introduced populations of a weedy invader Author(s) Endriss, S. B. (US)
Alba, Christina (BU-J) RID
Norton, A. P. (US)
Pyšek, Petr (BU-J) RID, ORCID
Hufbauer, R. A. (US)Source Title Journal of Ecology. - : Wiley - ISSN 0022-0477
Roč. 106, č. 2 (2018), s. 699-713Number of pages 15 s. Language eng - English Country GB - United Kingdom Keywords plant invasions ; herbivory ; abiotic clines Subject RIV EH - Ecology, Behaviour OECD category Ecology R&D Projects GB14-36079G GA ČR - Czech Science Foundation (CSF) Institutional support BU-J - RVO:67985939 UT WOS 000425046300020 EID SCOPUS 85029219545 DOI 10.1111/1365-2745.12845 Annotation We investigated between-range differences in performance for Verbascum thapsus, a weedy invader known to grow larger in its introduced than native range. Specifically, we question whether adaptation to herbivory or climate best explains increased performance of introduced populations. We grew 14 native and 22 introduced populations of V. thapsus in two common garden locations: near Prague, Czech Republic (native range) and in Colorado, USA (introduced range). By removing herbivores from half of the plants within each garden we tested the prediction of the evolution of increased competitive ability (EICA) hypothesis: increased performance is driven by an evolutionary shift of resources away from defence against herbivory towards growth and reproduction. We then investigated whether genetically based clines in performance are expressed along climate gradients within both the native and introduced ranges. On average, seeds produce larger rosettes when collected from the introduced vs. native range. While this evolution of increased growth in introduced populations in part matches the prediction of EICA, climate, not herbivory, best explains this between-range difference. Specifically, seeds collected from the native range produce smaller rosettes as the climate of origin becomes cooler and drier, while there is no cline in performance in rosettes grown from seed collected from the introduced range, which are large regardless of climate of origin. Thus, a climate-based cline within the native range best explains lower average performance of native compared to introduced populations. The breakdown in a potentially adaptive cline emphasizes the need to more closely investigate the evolutionary processes that shape geographic structuring (or its absence) within the introduced range. In addition, EICA is not universally applicable to all invasion scenarios, and our findings underscore the importance of testing the underlying assumptions alongside the predictions of this hypothesis. Workplace Institute of Botany Contact Martina Bartošová, martina.bartosova@ibot.cas.cz, ibot@ibot.cas.cz, Tel.: 271 015 242 ; Marie Jakšová, marie.jaksova@ibot.cas.cz, Tel.: 384 721 156-8 Year of Publishing 2019
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