Ecology, Evolution and Organismal Biology Publications Ecology, Evolution and Organismal Biology Temperature-dependent Sex Determination under Rapid Anthropogenic Environmental Change: Evolution at a Turtle' S Pace? Temperature-dependent Sex Determination
Ecology, Evolution and Organismal Biology Publications Ecology, Evolution and Organismal Biology Temperature-dependent Sex Determination under Rapid Anthropogenic Environmental Change: Evolution at a Turtle' S Pace? Temperature-dependent Sex Determination
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通讯作者：
Jeanine M. Refsnider;F. Janzen
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作者：
Jeanine M. Refsnider;F. Janzen
生物体通过自然选择的进化而适应环境，这一过程通常经历许多代。目前，生物驱动的环境变化比人类影响之前快了几个数量级，这可能会超过一些生物体的适应能力。在这里，我们专注于与温度依赖性性别决定（TSD），一个典型的多型性，在一个模型龟物种，以解决与TSD物种的进化潜力，以应对快速的气候变化的性状。我们表明，首先，在物种的性别比结果与TSD是敏感的气候变化。然后，我们确定的进化潜力，在遗传力方面，TSD和量化的进化潜力的三个关键性状参与TSD：关键温度，产妇巢址的选择，筑巢物候。我们发现，这些特征显示不同的模式的适应潜力：关键温度表现出适度的遗传变异，而巢址的选择和筑巢物候，具有相当大的表型可塑性，只有适度的进化潜力，改变性别比例。因此，最有可能的反应与TSD的物种的生殖引起的气候变化可能是一个组合的性别决定途径的热敏感性和可塑性的母性筑巢行为的微进化。
Organisms become adapted to their environment by evolving through natural selection, a process that generally transpires over many generations. Currently, anthropogenically-driven environmental changes are occurring orders of magnitude faster than they did prior to human influence, which could potentially outpace the ability of some organisms to adapt. Here, we focus on traits associated with temperature-dependent sex determination (TSD), a classic polyphenism, in a model turtle species to address the evolutionary potential of species with TSD to respond to rapid climate change. We show, first, that sex-ratio outcomes in species with TSD are sensitive to climatic variation. We then identify the evolutionary potential, in terms of heritability, of TSD and quantify the evolutionary potential of three key traits involved in TSD: pivotal temperature, maternal nest-site choice, and nesting phenology. We find that these traits display different patterns of adaptive potential: pivotal temperature exhibits moderate heritable variation, while nest-site choice and nesting phenology, with considerable phenotypic plasticity, have only modest evolutionary potential to alter sex ratios. Therefore, the most likely response of species with TSD to anthropogenically-induced climate change may be a combination of microevolution in thermal sensitivity of the sex-determining pathway and of plasticity in maternal nesting behavior.