Genetic and thermal effects on the latitudinal variation in the timing of fin development of a fish Oryzias latipes
Genetic and thermal effects on the latitudinal variation in the timing of fin development of a fish Oryzias latipes
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DOI：
10.1016/j.jtherbio.2011.06.003
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发表时间：
2011-08-01
影响因子：
2.7
通讯作者：
Yamahira, Kazunori
中科院分区：
文献类型：
--
作者：
Kawajiri, Maiko;Fujimoto, Shingo;Yamahira, Kazunori
异时性是生物在发育过程中的一种进化变化，是生物形态多样性的主要原因之一。据报道，在青鳉Oryzias latipes，高纬度的幼虫有一个遗传倾向，完成鳍射线形成在更大的身体尺寸，这导致相对较短的肛门和背鳍的成年人。然而，这种纬向，异时的变化，在野生的鳍长可以部分解释纬向差异的热环境，如果温度影响鳍射线形成的时间。共同的环境实验表明，在完成鳍（鳍射线的基本骨架）形成的身体尺寸是在高纬度的幼虫比在低纬度的幼虫在所有温度下检查，支持的建议，鳍射线形成的前是遗传延迟。然而，表型可塑性反应温度也很明显，较低的温度造成延迟鳍射线的形成，直到一个更大的身体尺寸已经实现了在高纬度和低纬度的幼虫。这些观察结果表明，栖息地的温度也有助于在鳍发育的时间，放大表型变异鳍长度跨纬度的纬度差异。我们讨论的原因，这种积极的协方差之间的遗传和环境影响的纬度，异时变化，从局部适应和进化的表型可塑性的观点。(C)2011爱思唯尔有限公司保留所有权利。
Heterochrony, an evolutionary change in developmental processes, is one of the major proximate causes of morphological diversity of organisms. It has been reported in the medaka Oryzias latipes that higher-latitude larvae have a genetic tendency to complete fin ray formation at larger body sizes, which results in relatively shorter anal and dorsal fins in adults. However, this latitudinal, heterochronic variation in fin length in the wild may be partially explained by latitudinal differences in thermal environments, if temperatures affect the timing of fin ray formation. Common-environment experiments revealed that the body size at which fin pterygiophore (a basal skeleton of fin rays) formation was completed was larger in higher-latitude larvae than in lower-latitude larvae at all temperatures examined, supporting the proposal that fin ray formation of the former is genetically delayed. However, phenotypic plasticity in response to temperature was also evident; lower temperatures caused delayed fin ray formation until a larger body size had been achieved in both high- and low-latitude larvae. These observations suggest that habitat temperatures also contribute to the latitudinal difference in the timing of fin development, magnifying phenotypic variation in fin length across latitudes. We discuss reasons for this positive covariance between genetic and environmental effects on the latitudinal, heterochronic variation, from the viewpoint of local adaptation and evolution of phenotypic plasticity. (C) 2011 Elsevier Ltd. All rights reserved.