Limited evolutionary rescue of locally adapted populations facing climate change.
Limited evolutionary rescue of locally adapted populations facing climate change.
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DOI：
10.1098/rstb.2012.0083
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发表时间：
2013-01-19
期刊：
影响因子：
--
通讯作者：
Travis JM
中科院分区：
文献类型：
--
作者：
Schiffers K;Bourne EC;Lavergne S;Thuiller W;Travis JM
扩散是一个种群进化潜力的关键决定因素。它促进了有益等位基因在空间扩展种群分布范围内的传播，并提高了适应速度。然而，当栖息地是异质性的，个人在当地适应，分散可能，在同一时间，通过增加适应不良，减少健身。在这里，我们使用一个空间上明确的，等位基因的模拟模型来量化这些模棱两可的影响扩散影响人口的进化反应不断变化的气候。个体携带一套二倍体染色体，其等位基因分别编码适应非气候环境条件和气候条件。我们的模型结果表明，基因流和栖息地异质性之间的相互作用可能会降低有效的扩散和人口规模的程度，大大降低了进化救援的可能性。重要的是，即使进化拯救使一个种群免于灭绝，其空间范围在气候变化后可能会大大缩小，也就是说，拯救只是部分的。这些研究结果强调，忽视非气候的影响，当地的适应可能会导致相当高估人口的进化迅速的环境变化。
Dispersal is a key determinant of a population's evolutionary potential. It facilitates the propagation of beneficial alleles throughout the distributional range of spatially outspread populations and increases the speed of adaptation. However, when habitat is heterogeneous and individuals are locally adapted, dispersal may, at the same time, reduce fitness through increasing maladaptation. Here, we use a spatially explicit, allelic simulation model to quantify how these equivocal effects of dispersal affect a population's evolutionary response to changing climate. Individuals carry a diploid set of chromosomes, with alleles coding for adaptation to non-climatic environmental conditions and climatic conditions, respectively. Our model results demonstrate that the interplay between gene flow and habitat heterogeneity may decrease effective dispersal and population size to such an extent that substantially reduces the likelihood of evolutionary rescue. Importantly, even when evolutionary rescue saves a population from extinction, its spatial range following climate change may be strongly narrowed, that is, the rescue is only partial. These findings emphasize that neglecting the impact of non-climatic, local adaptation might lead to a considerable overestimation of a population's evolvability under rapid environmental change.
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