Experimental test of genetic rescue in isolated populations of brook trout
Experimental test of genetic rescue in isolated populations of brook trout
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溪鳟分离种群遗传拯救的实验测试
DOI：
10.1111/mec.14225
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发表时间：
2017
影响因子：
4.9
通讯作者：
Whiteley, Andrew R.
中科院分区：
文献类型：
--
作者：
Robinson, Zachary L.;Coombs, Jason A.;Hudy, Mark;Nislow, Keith H.;Letcher, Benjamin H.;Whiteley, Andrew R.
遗传拯救是一个日益被考虑的保护措施，以解决与栖息地丧失和破碎化有关的遗传侵蚀。促进迁移所产生的基因流动可能会提高适应性和适应潜力，但并非没有风险（例如，远系繁殖抑郁症）。在这里，我们进行了一个测试的遗传救援易位10（每种性别5）溪鳟鱼（红点鲑fontinalis）从一个单一的来源，四个附近和孤立的流人口。为了控制易位个体的人口学贡献，从每个受体群体中移除10个居民个体（每种性别5个）。在引入易位个体之前，两个最小的屏障以上种群的遗传多样性大大降低，并且所有种群相对于相邻的屏障以下种群的有效繁殖者数量减少。在易位后的第一次繁殖中，40个易位个体中有31个（78%）成功繁殖。在随机交配下，易位的个体比预期的更多，并且通常产生更大的全同胞家庭。我们在四个受体群体中的三个中观察到相对高的（>20%）渐渗。易位增加受体群体的遗传多样性的45%，等位基因丰富度和25%的预期杂合性。此外，强有力的证据表明，杂种优势，观察到通过显着较大的身体尺寸的杂交后代相对于居民后代在所有受体人群。对这些种群的持续监测将测试第一代之后的负面适应性影响。然而，这些结果提供了急需的实验数据，以告知遗传拯救动机易位的潜在有效性。
Genetic rescue is an increasingly considered conservation measure to address genetic erosion associated with habitat loss and fragmentation. The resulting gene flow from facilitating migration may improve fitness and adaptive potential, but is not without risks (e.g., outbreeding depression). Here, we conducted a test of genetic rescue by translocating ten (five of each sex) brook trout (Salvelinus fontinalis) from a single source to four nearby and isolated stream populations. To control for the demographic contribution of translocated individuals, ten resident individuals (five of each sex) were removed from each recipient population. Prior to the introduction of translocated individuals, the two smallest above‐barrier populations had substantially lower genetic diversity, and all populations had reduced effective number of breeders relative to adjacent below‐barrier populations. In the first reproductive bout following translocation, 31 of 40 (78%) translocated individuals reproduced successfully. Translocated individuals contributed to more families than expected under random mating and generally produced larger full‐sibling families. We observed relatively high (>20%) introgression in three of the four recipient populations. The translocations increased genetic diversity of recipient populations by 45% in allelic richness and 25% in expected heterozygosity. Additionally, strong evidence of hybrid vigour was observed through significantly larger body sizes of hybrid offspring relative to resident offspring in all recipient populations. Continued monitoring of these populations will test for negative fitness effects beyond the first generation. However, these results provide much‐needed experimental data to inform the potential effectiveness of genetic rescue‐motivated translocations.
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影响因子：
3.3
作者：
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通讯作者：
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通讯作者：
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影响因子：
2.4
作者：
Andrew R Whiteley;J. A. Coombs;M. Hudy;Zachary L Robinson;Amanda R. Colton;K. Nislow;B. Letcher
通讯作者：
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