期刊
ECOLOGY LETTERS
卷 22, 期 11, 页码 1817-1827出版社
WILEY
DOI: 10.1111/ele.13364
关键词
Allee effect; demographic fluctuations; density dependence; diversity loss; founder effect; genetic drift; population pressure; pulled invasions; pushed invasions; reaction-diffusion
类别
资金
- Simons Foundation [409704, 327934]
- Research Corporation for Science Advancement through Cottrell Scholar Award [24010]
- Research Corporation for Science Advancement through Scialog grant [26119]
- Moore foundation [6790.08]
- National Science Foundation [1555330]
- National Institute of General Medical Sciences of the National Institutes of Health Award [R01GM115851]
Theory predicts rapid genetic drift during invasions, yet many expanding populations maintain high genetic diversity. We find that genetic drift is dramatically suppressed when dispersal rates increase with the population density because many more migrants from the diverse, high-density regions arrive at the expansion edge. When density dependence is weak or negative, the effective population size of the front scales only logarithmically with the carrying capacity. The dependence, however, switches to a sublinear power law and then to a linear increase as the density dependence becomes strongly positive. We develop a unified framework revealing that the transitions between different regimes of diversity loss are controlled by a single, universal quantity: the ratio of the expansion velocity to the geometric mean of dispersal and growth rates at expansion edge. Our results suggest that positive density dependence could dramatically alter evolution in expanding populations even when its contribution to the expansion velocity is small.
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