Gaggiotti OE
Southwest Fisheries Science Center, National Marine Fisheries Service, La Jolla, California, 92038-0271
Theor Popul Biol. 1996 Oct;50(2):178-208. doi: 10.1006/tpbi.1996.0028.
The present study investigates the effect that different patterns of migration have on the genetic structure of source-sink metapopulations specifically modelling the dynamics of local populations. The model assumes a metapopulation consisting of a single source and s different sink populations and considers the expected number of nucleotide differences between two genes drawn at random from the source-sink metapopulation. The results show that a collection of interconnected sinks can maintain a substantial fraction of the genetic variability observed in the source population, particularly where migration from the source is continuous over time. The degree of genetic differentiation among the sinks might be large, especially if migration from the source is stochastic. Genetic differentiation is small when extinctions are frequent (because most of the sink populations are composed of recent migrants from the source) or extremely rare (because of the increased effect of migration among sinks), being maximized when the frequency of extinctions is between these two extremes.
本研究调查了不同迁移模式对源 - 汇集合种群遗传结构的影响，具体对当地种群动态进行建模。该模型假定一个集合种群由一个单一源种群和s个不同的汇种群组成，并考虑从源 - 汇集合种群中随机抽取的两个基因之间的核苷酸差异预期数量。结果表明，相互连接的汇种群集合能够维持源种群中观察到的相当一部分遗传变异性，特别是在源种群的迁移随时间持续的情况下。汇种群之间的遗传分化程度可能很大，尤其是当来自源种群的迁移是随机的时候。当灭绝频繁时（因为大多数汇种群由近期来自源种群的移民组成）或极其罕见时（由于汇种群之间迁移的影响增加），遗传分化较小，而当灭绝频率处于这两个极端之间时，遗传分化最大。
