Life‐history and habitat features influence the within‐river genetic structure of Atlantic salmon
Life‐history and habitat features influence the within‐river genetic structure of Atlantic salmon
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生活史和栖息地特征影响大西洋鲑鱼的河内遗传结构
DOI：
10.1111/j.1365-294x.2007.03329.x
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发表时间：
2007
影响因子：
4.9
通讯作者：
C. Primmer
中科院分区：
文献类型：
--
作者：
Juha‐Pekka Vähä;J. Erkinaro;E. Niemelä;C. Primmer
定义种群并确定影响遗传结构的生态和生活史特征，对于了解物种生物学，从而管理受威胁或濒危的物种或种群非常重要。在这项研究中，首先使用基于模型的聚类方法对世界上最大的本土大西洋鲑鱼(Salmo Salar)种群进行了推断，然后确定了最能预测种群遗传多样性的生活史和栖息地变量。这项研究表明，大西洋鲑鱼在特诺河水系中的出生归宿至少在支流水平上是准确的。总体而言，在这个大的河流系统中，根据主要支流确定种群是一种合理的方法，而在河流的主干，推断的种群数量少于不同的采样点数量。主干种群和水源种群的遗传多样性较高，差异较小，而每条支流形成的种群具有较高的遗传分化和较低的遗传多样性。地理距离不能很好地解释种群结构和种群间遗传多样性的差异。相反，年龄结构是解释种群遗传多样性变化的最具预测性的变量，由多海冬季产卵者的比例估计。这一观察结果与理论预测一致，强调了大型多海冬雌性在维持种群遗传多样性方面的本质。此外，根据个体等位基因丰富度估计的种群的独特遗传多样性受地点的可达性影响，较难进入的地点具有较低的独特遗传多样性。我们的结果表明，尽管该物种的迁徙能力很高，但支流培育了相对封闭的种群，基因流动很少，这在制定系统管理策略时将是重要的考虑因素。
Defining populations and identifying ecological and life‐history characteristics affecting genetic structure is important for understanding species biology and hence, for managing threatened or endangered species or populations. In this study, populations of the world's largest indigenous Atlantic salmon (Salmo salar) stock were first inferred using model‐based clustering methods, following which life‐history and habitat variables best predicting the genetic diversity of populations were identified. This study revealed that natal homing of Atlantic salmon within the Teno River system is accurate at least to the tributary level. Generally, defining populations by main tributaries was observed to be a reasonable approach in this large river system, whereas in the mainstem of the river, the number of inferred populations was fewer than the number of distinct sampling sites. Mainstem and headwater populations were genetically more diverse and less diverged, while each tributary fostered a distinct population with high genetic differentiation and lower genetic diversity. Population structure and variation in genetic diversity among populations were poorly explained by geographical distance. In contrast, age‐structure, as estimated by the proportion of multisea‐winter spawners, was the most predictive variable in explaining the variation in the genetic diversity of the populations. This observation, being in agreement with theoretical predictions, emphasizes the essence of large multisea‐winter females in maintaining the genetic diversity of populations. In addition, the unique genetic diversity of populations, as estimated by private allele richness, was affected by the ease of accessibility of a site, with more difficult to access sites having lower unique genetic diversity. Our results show that despite this species’ high capacity for migration, tributaries foster relatively closed populations with little gene flow which will be important to consider when developing management strategies for the system.
影响因子：
1.9
作者：
GUO, SW;THOMPSON, EA
通讯作者：
THOMPSON, EA
使用多位点基因型数据推断群体结构：连锁位点和相关等位基因频率。
影响因子：
3.3
作者：
Falush,Daniel;Stephens,Matthew;Pritchard,JonathanK
通讯作者：
Pritchard,JonathanK