期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 36, 页码 15379-15383出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0902257106
关键词
genetic bottleneck; mating system; phenotypic performance; self fertilization; range margins
资金
- Natural Environment Research Council
- National Science Foundation of China [30670314]
- Fundacion Caixa Galicia, Spain
- Natural Environment Research Council [NE/C511313/1] Funding Source: researchfish
Many species expanded their geographic ranges from core refugium'' populations when the global climate warmed after the Pleistocene. The bottlenecks that occur during such range expansions diminish genetic variation in marginal populations, rendering them less responsive to selection. Here, we show that range expansion also strongly depletes inbreeding depression. We compared inbreeding depression among 20 populations across the expanded range of a common European plant, and found that marginal populations had greatly reduced inbreeding depression. Similar patterns were also revealed by multilocus computer simulations. Low inbreeding depression is predicted to ease conditions for the evolution of self-fertilization, and selfing is known to be particularly frequent in marginal populations. Therefore, our findings expose a remarkable aspect of evolution at range margins, where a history of expansion can reverse the direction of selection on the mating system, providing a parsimonious explanation for the high incidence of selfing in marginal populations.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据