NEGATIVE FREQUENCY-DEPENDENT SELECTION IN FEMALE COLOR POLYMORPHISM OF A DAMSELFLY
NEGATIVE FREQUENCY-DEPENDENT SELECTION IN FEMALE COLOR POLYMORPHISM OF A DAMSELFLY
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DOI：
10.1111/j.1558-5646.2010.01083.x
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发表时间：
2010-12-01
期刊：
影响因子：
3.3
通讯作者：
Watanabe, Mamoru
中科院分区：
文献类型：
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作者：
Takahashi, Yuma;Yoshimura, Jin;Watanabe, Mamoru
负频率依赖选择（Negative frequency-dependent selection， NFDS）是自然界中维持遗传多态性最强大的选择力之一。最近报道了许多由NFDS引起的潜在多态性病例。其中一些非常复杂，尽管强烈支持NFDS。本文研究了塞内加尔二形豆娘（Ischnura senegalensis）野生种群的NFDS，其中雌性为雌雄同体。具体来说，我们(1)测试了适应度对形态频率的响应，(2)建立了一个简单的群体遗传模型，(3)比较了观察到的和预测的形态频率动态。两种变体的适应度是其自身在种群中的频率的反函数，当它们的频率相似时，它们的适应度大致相等。从而满足了NFDS的必要条件。长期的野外观测表明，形态频率以两代为周期振荡。小群体中的变形频率经历大的振荡，而大群体中的变形频率则经历小的振荡。观察到的动态的人口学特性与我们的模型非常吻合。这个例子是自然界中最简单的NFDS保持遗传多态性的确诊病例之一。
Negative frequency-dependent selection (NFDS) is one of the most powerful selective forces maintaining genetic polymorphisms in nature. Recently many prospective cases of polymorphisms by NFDS have been reported. Some of them are very complicated, although strongly supportive of the NFDS. Here we investigate NFDS in wild populations of the dimorphic damselfly Ischnura senegalensis, in which females occur as andromorphs and gynomorphs. Specifically, we (1) test fitness responses to morph frequencies, (2) built a simple population genetic model, and (3) compare the observed and predicted morph-frequency dynamics. Fitnesses of the two morphs are an inverse function of its own frequency in a population, and are about equal when their frequencies are similar. Thus the conditions necessary for NFDS are satisfied. The long-term field surveys show that the morph frequencies oscillate with a period of two generations. Morph frequencies in a small population undergo large oscillations whereas those in a large population do small oscillations. The demographic properties of the observed dynamics agree well with those of our model. This example is one of the simplest confirmed cases of NFDS maintaining genetic polymorphisms in nature.