Demographic structure and genetic variability throughout the distribution of Platte thistle (Cirsium canescens Asteraceae)

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• 作者：Robby L. McMinn ; F. Leland Russell and James B. Beck
• 刊名：Journal of Biogeography
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：44
• 期：2
• 页码：375-385
• 全文大小：542K
• ISSN：1365-2699

文摘

Understanding spatial variation in the demographic and genetic structure of populations is central to explaining causes of species range limits and to species conservation. The Abundant Centre Hypothesis (ACH) predicts that as one moves away from the centre of a species’ biogeographical range, populations become less frequent and more isolated, as well as exhibiting decreasing within-population density. This increased isolation may lead to reduced genetic variability in peripheral populations by limiting gene flow. In this study, we asked whether the frequency, within-population density and genetic diversity of Cirsium canescens (Platte thistle) populations decreased from the range centre to the edge, as predicted by the ACH.