Egg size and the adaptive capacity of early life history traits in Chinook salmon (Oncorhynchus tshawytscha)
Egg size and the adaptive capacity of early life history traits in Chinook salmon (Oncorhynchus tshawytscha)
复制标题
奇努克鲑鱼卵大小和早期生活史性状的适应能力（Oncorhynchus tshawytscha）
DOI：
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发表时间：
2017
影响因子：
4.1
通讯作者：
Y. E. Morbey
中科院分区：
文献类型：
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作者：
M. Thorn;Y. E. Morbey
子代性状受母体效应的影响很大，这些母体效应可能为种群适应不断变化的热环境提供了重要途径。我们研究了不同温度条件下，卵大小对引进的五大湖奇努克鲑鱼（Oncorhynchus tshawytscha）种群早期生活史特征的种群间和种群内变异的影响。我们在6.5，9.4和15.2°C的共同花园孵化研究中饲养了三个种群的奇努克鲑鱼，并测量了发育过程中各种与健康相关的性状。我们发现，早期生活史特征的大部分群体间变异都可以用卵的大小来解释。然而，卵大小对种群间变异的贡献随着温度的升高而降低，这表明其他效应，如遗传，在高温下也有贡献。在种群内，鸡蛋大小解释了大部分的母畜方差和母体效应的性状在每个温度下，而鸡蛋大小一般有很少或没有影响的公畜方差和遗传力。总的来说，我们的研究结果表明，鸡蛋大小的显着贡献，使群体之间和群体内形成早期生活史表型，并表明，鸡蛋大小是一个重要的途径，通过它的后代表型可以在当代的时间尺度上演变。
Offspring traits are greatly influenced by maternal effects, and these maternal effects may provide an important pathway through which populations can adapt to changing thermal environments. We investigated the effect of egg size on the among‐ and within‐population variation in early life history traits among introduced Great Lakes Chinook salmon (Oncorhynchus tshawytscha) populations under varying thermal conditions. We reared Chinook salmon from three populations in a common‐garden hatchery study at 6.5, 9.4, and 15.2°C and measured a variety of fitness‐related traits during development. We found that most of the among‐population variation in early life history traits was explained by egg size. However, the contribution of egg size to the among‐population variation decreased with an increase in temperature suggesting that other effects, such as genetic, contribute at high temperature. Within populations, egg size explained much of the dam variance and maternal effect for traits in every temperature, whereas egg size generally had little to no influence on the sire variance and heritability. Overall, our results demonstrate the significant contribution egg size makes to shaping early life history phenotypes among and within populations, and suggest that egg size is an important pathway through which offspring phenotypes can evolve on contemporary timescales.
影响因子：
6.6
作者：
Nakagawa, Shinichi;Schielzeth, Holger
通讯作者：
Schielzeth, Holger