The ecological genetics of conditional strategies
The ecological genetics of conditional strategies
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DOI：
10.1086/386313
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发表时间：
2004-06-01
影响因子：
2.9
通讯作者：
Lively, CM
中科院分区：
文献类型：
--
作者：
Hazel, W;Smock, R;Lively, CM
我们为条件策略开发了一个定量遗传模型，该模型结合了先前策略模型的生态现实主义。与策略模型类似，结果表明，环境异质性、线索可靠性和条件策略替代策略的环境依赖性适应性权衡相互作用，决定条件策略何时受到青睐，并且条件策略应该是自然界适应性变异的常见形式。结果还表明，有条件和无条件的发育可以通过以下两种方式之一来维持：通过频率依赖性选择或通过维持超过诱导阈值的遗传变异。然后，我们修改了模型，以考虑环境线索暴露的方差以及对线索响应的方差，从而可以推导剂量反应曲线。结果表明，增加反应的遗传方差既可以使剂量反应曲线变平，又可以使剂量反应曲线移动。最后，我们修改模型以导出阻断条件策略表达的基因的群体多态性的剂量反应曲线。我们通过应用于潮间带藤壶捕食者诱导的防御来说明该模型的实用性，并将结果与选择的表型模型进行比较。
We develop a quantitative genetic model for conditional strategies that incorporates the ecological realism of previous strategic models. Similar to strategic models, the results show that environmental heterogeneity, cue reliability, and environment-dependent fitness trade-offs for the alternative tactics of the conditional strategy interact to determine when conditional strategies will be favored and that conditional strategies should be a common form of adaptive variation in nature. The results also show that conditional and unconditional development can be maintained in one of two ways: by frequency-dependent selection or by the maintenance of genetic variation that exceeds the threshold for induction. We then modified the model to take into account variance in exposures to the environmental cue as well as variance in response to the cue, which allows a derivation of a dose-response curve. Here the results showed that increasing the genetic variance for response both flattens and shifts the dose-response curve. Finally, we modify the model to derive the dose-response curve for a population polymorphic for a gene that blocks expression of the conditional strategy. We illustrate the utility of the model by application to predator-induced defense in an intertidal barnacle and compare the results with phenotypic models of selection.