气候变化领域集成服务门户(CCPortal): Genetic drift in range expansions is very sensitive to density dependence in dispersal and growth

CCPortal

DOI	10.1111/ele.13364
	Genetic drift in range expansions is very sensitive to density dependence in dispersal and growth
	Birzu G.; Matin S.; Hallatschek O.; Korolev K.S.
发表日期	2019
ISSN	1461023X
卷号	22 期号:11
英文摘要	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. © 2019 John Wiley & Sons Ltd/CNRS
英文关键词	Allee effect; demographic fluctuations; density dependence; diversity loss; founder effect; genetic drift; population pressure; pulled invasions; pushed invasions; reaction-diffusion
语种	英语
scopus关键词	genetic drift; genetic variation; population density; population dynamics; Genetic Drift; Genetic Variation; Population Density; Population Dynamics
来源期刊	Ecology Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/121011
作者单位	Department of Physics, Boston University, Boston, MA 02215, United States; Departments of Physics and Integrative Biology, University of California, Berkeley, CA 94720, United States; Department of Physics and Graduate Program in Bioinformatics, Boston University, Boston, MA 02215, United States
推荐引用方式 GB/T 7714	Birzu G.,Matin S.,Hallatschek O.,et al. Genetic drift in range expansions is very sensitive to density dependence in dispersal and growth[J],2019,22(11).
APA	Birzu G.,Matin S.,Hallatschek O.,&Korolev K.S..(2019).Genetic drift in range expansions is very sensitive to density dependence in dispersal and growth.Ecology Letters,22(11).
MLA	Birzu G.,et al."Genetic drift in range expansions is very sensitive to density dependence in dispersal and growth".Ecology Letters 22.11(2019).