Fragmentation and patch size shape genetic structure of brook trout populations
Fragmentation and patch size shape genetic structure of brook trout populations
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溪鳟种群的破碎和斑块大小形状遗传结构
DOI：
10.1139/cjfas-2012-0493
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发表时间：
2013
影响因子：
2.4
通讯作者：
B. Letcher
中科院分区：
文献类型：
--
作者：
Andrew R Whiteley;J. A. Coombs;M. Hudy;Zachary L Robinson;Amanda R. Colton;K. Nislow;B. Letcher
我们在美国弗吉尼亚州一个流域的八个溪鳟（Salvelinus fontinalis）栖息地斑块中测试了栖息地斑块大小和连通性对遗传结构和有效种群规模的相对影响。对两个连续队列（2010 年和 2011 年）的 2229 条当年幼鳟鱼的 8 个微卫星位点的变异进行了检查。所有人群的遗传分化都很明显。总体 F`ST 为 0.397（95% CI：0.322–0.525），总体 FST 为 0.124（95% CI：0.096–0.159）。障碍上方斑块大小与遗传多样性、N^b 和遗传分化有很强的正相关关系。我们的分析与较小的障碍上方斑块更大的灭绝风险是一致的。较大的障碍上方斑块包含更大的遗传多样性，但相对于相邻的障碍下方斑块而言，N^b 减少。障碍物的主要影响可能是减少障碍物上方可用的产卵栖息地，即使对于较大的障碍物上方斑块也是如此。障碍下方的斑块也显示出...
We tested the relative influence of habitat patch size and connectivity on genetic structure and effective population size in eight brook trout (Salvelinus fontinalis) habitat patches in a watershed in Virginia, USA. Variation at eight microsatellite loci in 2229 young-of-the-year brook trout for two successive cohorts (2010 and 2011) was examined. Genetic differentiation across all populations was pronounced. Overall F` ST was 0.397 (95% CI: 0.322–0.525) and overall FST was 0.124 (95% CI: 0.096–0.159). Above-barrier patch size had a strong positive relationship with genetic diversity, N^b , and genetic differentiation. Our analysis is consistent with greater extinction risk in smaller above-barrier patches. Larger above-barrier patches contained greater genetic diversity but reduced N^b relative to adjacent below-barrier patches. The primary effect of barriers may be to reduce available above-barrier spawning habitat, even for larger above-barrier patches. Below-barrier patches also showed evidence of re...