Separating the effects of habitat area, fragmentation and matrix resistance on genetic differentiation in complex landscapes
Separating the effects of habitat area, fragmentation and matrix resistance on genetic differentiation in complex landscapes
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DOI：
10.1007/s10980-011-9693-0
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发表时间：
2012-03-01
影响因子：
5.2
通讯作者：
Landguth, Erin L.
中科院分区：
文献类型：
--
作者：
Cushman, Samuel A.;Shirk, Andrew;Landguth, Erin L.
很少有人知道景观镶嵌的变化如何影响遗传分化。本文的目的是量化栖息地面积和配置的相对重要性，以及栖息地和非栖息地之间的抗性差异，遗传分化。我们推测，栖息地配置将更有影响力比栖息地面积在影响遗传分化。种群大小与栖息地面积呈正相关，因此栖息地面积应该影响遗传漂变，而不是基因流。相反，不同的速率和模式的基因流在景观应与栖息地的配置。使用空间上明确的，基于个人的模拟建模，我们发现，栖息地的配置有更强的遗传分化比栖息地面积的关系，但有一个高度的混淆栖息地面积和配置之间的影响。我们评估了六个广泛使用的景观指标的预测能力，发现斑块的凝聚力和相关长度的栖息地是最强的个体遗传分化的预测。相关长度、斑块密度和斑块密度是预测复杂景观中遗传分化程度的最简洁的变量。
Little is known about how variation in landscape mosaics affects genetic differentiation. The goal of this paper is to quantify the relative importance of habitat area and configuration, as well as the contrast in resistance between habitat and non-habitat, on genetic differentiation. We hypothesized that habitat configuration would be more influential than habitat area in influencing genetic differentiation. Population size is positively related to habitat area, and therefore habitat area should affect genetic drift, but not gene flow. In contrast, differential rates and patterns of gene flow across a landscape should be related to habitat configuration. Using spatially explicit, individual-based simulation modeling, we found that habitat configuration had stronger relationships with genetic differentiation than did habitat area, but there was a high degree of confounding between the effects of habitat area and configuration. We evaluated the predictive ability of six widely used landscape metrics and found that patch cohesion and correlation length of habitat are among the strongest individual predictors of genetic differentiation. Correlation length, patch density and clumpy are the most parsimonious set of variables to predict the magnitude of genetic differentiation in complex landscapes.