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首页> 外文期刊>Journal of Mathematical Biology >Evolution of condition-dependent dispersal under kin competition
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Evolution of condition-dependent dispersal under kin competition

机译：亲属竞争下条件依赖分散的演化

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摘要

Dispersers often differ in body condition from non-dispersers. The social dominance hypothesis explains dispersal of weak individuals, but it is not yet well understood why strong individuals, which could easily retain their natal site, are sometimes exposed to risky dispersal. Based on the model for dispersal under kin competition by Hamilton and May, we construct a model where dispersal propensity depends on body condition. We consider an annual species that inhabits a patchy environment with varying patch qualities. Offspring body condition corresponds to the quality of the natal patch and competitive ability increases with body condition. Our main general result balances the fitness benefit from not dispersing and retaining the natal patch and the benefit from dispersing and establishing somewhere else. We present four different examples for competition, which all hint that dispersal of strong individuals may be a common outcome under the assumptions of the present model. In three of the examples, the evolutionarily stable dispersal probability is an increasing function of body condition. However, we found an example where, counterintuitively, the evolutionarily stable dispersal probability is a non-monotone function of body condition such that both very weak and very strong individuals disperse with high probability but individuals of intermediate body condition do not disperse at all.
机译：分散剂的身体状况通常与非分散剂不同。社会支配性假设解释了弱势个体的分散，但尚不十分清楚为何为什么可以轻易保留其出生地的强势个体有时会面临危险的分散。基于汉密尔顿和梅的亲属竞争下的分散模型，我们构建了一个分散倾向取决于身体状况的模型。我们考虑一种生活在斑驳质量不同的斑驳环境中的一年生物种。后代的身体状况与出生补丁的质量相对应，竞争能力随身体状况而增加。我们的主要总体结果平衡了不分散和保留出生斑块所带来的健身益处，以及分散和建立其他地方所带来的益处。我们提供了四个不同的竞争示例，所有这些示例都表明，在本模型的假设下，强人的分散可能是一个共同的结果。在三个示例中，进化稳定的扩散概率是身体状况的增加函数。但是，我们发现一个例子，与直觉相反，进化稳定的分散概率是身体状况的非单调函数，因此非常弱的个体和非常强的个体都以高概率分散，而处于中等身体状况的个体则根本不分散。

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