Directional gene flow patterns in disjunct populations of the black ratsnake (Pantheropis obsoletus) and the Blanding's turtle (Emydoidea blandingii)
Directional gene flow patterns in disjunct populations of the black ratsnake (Pantheropis obsoletus) and the Blanding's turtle (Emydoidea blandingii)
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DOI：
10.1007/s10592-008-9607-0
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发表时间：
2009-04-01
影响因子：
2.2
通讯作者：
Weatherhead, Patrick J.
中科院分区：
文献类型：
--
作者：
Howes, Briar J.;Brown, Joseph W.;Weatherhead, Patrick J.
估计和维护当地种群之间的连接是许多濒危物种的重要保护目标。我们使用贝叶斯统计和结合理论来估计短期和长期的定向基因流亚群之间的两个爬行动物，发生在加拿大的外围人口，地理上是分离的核心，其各自的物种的范围：黑鼠蛇和布兰丁的海龟。定向基因流的估计被用来检查人口的连接性和潜在的遗传源库动态。对于这两个物种，我们的估计方向的短期和长期的基因流始终低于估计推断以前从F（ST）的措施。短期和长期的基因流估计是不一致的，在这两个物种，表明人口动态变化的时间在这两个物种。定向基因流的这些估计被用来确定特定的亚群在这两个物种，可能是高保护价值，因为他们是净出口的个人到其他亚群。总体而言，我们的研究结果表明，使用更复杂的方法来评估种群遗传数据可以为保护濒危物种提供有价值的信息，包括对亚群连通性的双向估计，这种估计依赖于比传统分析更少的假设。这些信息可以用于保护从业者更好地了解所需的地理范围，以保持一个功能的集合种群，确定工作景观内的栖息地走廊可能是最重要的，以保持亚种群之间的连接，并优先考虑亚种群的潜力，作为集合种群内的遗传来源。
The estimation and maintenance of connectivity among local populations is an important conservation goal for many species at risk. We used Bayesian statistics and coalescent theory to estimate short- and long-term directional gene flow among subpopulations for two reptiles that occur in Canada as peripheral populations that are geographically disjunct from the core of their respective species' ranges: the black ratsnake and the Blanding's turtle. Estimates of directional gene flow were used to examine population connectivity and potential genetic source-sink dynamics. For both species, our estimates of directional short- and long-term gene flow were consistently lower than estimates inferred previously from F (ST) measures. Short- and long-term gene flow estimates were discordant in both species, suggesting that population dynamics have varied temporally in both species. These estimates of directional gene flow were used to identify specific subpopulations in both species that may be of high conservation value because they are net exporters of individuals to other subpopulations. Overall, our results show that the use of more sophisticated methods to evaluate population genetic data can provide valuable information for the conservation of species at risk, including bidirectional estimates of subpopulation connectivity that rely on fewer assumptions than more traditional analyses. Such information can be used by conservation practitioners to better understand the geographic scope required to maintain a functional metapopulation, determine which habitat corridors within a working landscape may be most important to maintain connectivity among subpopulations, and to prioritize subpopulations with respect to their potential to act as genetic sources within the metapopulation.