Factors affecting the evolution of bleaching resistance in corals
Factors affecting the evolution of bleaching resistance in corals
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DOI：
10.1086/524956
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发表时间：
2008-02-01
影响因子：
2.9
通讯作者：
Caley, M. Julian
中科院分区：
文献类型：
--
作者：
Day, Troy;Nagel, Laura;Caley, M. Julian
我们提出了珊瑚-藻类互惠共生中伙伴之间共同进化相互作用的数学模型。我们的目标是更好地了解影响珊瑚抵抗漂白的潜在因素，以应对平均海洋温度的上升。我们探索了四个因素的进化后果：(I)适合度成分之间的权衡，(Ii)珊瑚漂白的不同近端机制，(Iii)漂白抗性的遗传决定，以及(Iv)有性繁殖模式。我们表明，共生共生中的特征，如珊瑚的耐热性，可能会受到新类型的进化限制，并且这些限制是由生态动力学调节的。我们还表明，漂白的某些近似机制对温度胁迫的进化响应更快，漂白抗性的种间控制性质和有性繁殖方式相互作用，强烈影响抗性等位基因的传播速度。这些定性的理论结果突出了未来经验研究的重要方向，以量化珊瑚礁进化出对热应力的抵抗力的潜力。
We present a mathematical model of coevolutionary interactions between partners in a coral-algae mutualistic symbiosis. Our goal is to better understand factors affecting the potential evolution of bleaching resistance in corals in response to increased average sea temperatures. We explore the evolutionary consequences of four factors: (i) trade-offs among fitness components, (ii) different proximate mechanisms of coral bleaching, (iii) the genetic determination of bleaching resistance, and (iv) the mode of sexual reproduction. We show that traits in mutualistic symbioses, such as thermal tolerance in corals, are potentially subject to novel kinds of evolutionary constraints and that these constraints are mediated by ecological dynamics. We also show that some proximate mechanisms of bleaching yield faster evolutionary responses to temperature stress and that the nature of interspecific control of bleaching resistance and the mode of sexual reproduction interact to strongly influence the rate of spread of resistance alleles. These qualitative theoretical results highlight important future directions for empirical research in order to quantify the potential for coral reefs to evolve resistance to thermal stress.