EXPERIMENTAL CONFIRMATION THAT BODY SIZE DETERMINES MATE PREFERENCE VIA PHENOTYPE MATCHING IN A STICKLEBACK SPECIES PAIR
EXPERIMENTAL CONFIRMATION THAT BODY SIZE DETERMINES MATE PREFERENCE VIA PHENOTYPE MATCHING IN A STICKLEBACK SPECIES PAIR
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DOI：
10.1111/evo.12041
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发表时间：
2013-05-01
期刊：
影响因子：
3.3
通讯作者：
Schluter, Dolph
中科院分区：
文献类型：
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作者：
Conte, Gina L.;Schluter, Dolph
通过表型匹配的配偶选择，即个体更喜欢与自己表型相似的配偶，应该有助于基因流的物种形成。这是因为控制交配信号（被匹配的表型）的基因也决定了优选的交配信号（交配偏好）。如果表型匹配是基于趋异自然选择下的性状，物种形成就更容易了。在这种情况下，选择性交配应该很容易演变为对性状的分歧选择的副产品。以前的观察研究同域，杂交threespine棘鱼物种（Gasterosteus aculeatus复合体）之间的相互交配表明，表型匹配可能发生的身体大小，性状下分歧的自然选择。为了验证这一点，我们使用身体大小的实验操作来排除混杂变量的影响。我们发现，大小操纵的底栖和湖沼棘鱼女性喜欢的配偶，其身体大小更接近匹配自己的。因此，很可能是通过表型匹配的间接交配促进了底栖和湖沼三棘鱼在基因流面前的起源和持久性。
Mate choice by phenotype matching, whereby individuals prefer a mate whose phenotype is similar to their own, should facilitate speciation with gene flow. This is because the genes that control mate signal (the phenotype being matched) also determine the preferred mate signal (mate preference). Speciation is made even easier if phenotype matching is based on a trait under divergent natural selection. In this case, assortative mating should readily evolve as a byproduct of divergent selection on the trait. Previous observational studies of assortative mating between sympatric, hybridizing threespine stickleback species (Gasterosteus aculeatus complex) suggested that phenotype matching might occur by body size, a trait under divergent natural selection. To test this, we used experimental manipulation of body size to rule out the effects of confounding variables. We found that size-manipulated benthic and limnetic stickleback females prefer mates whose body size more closely matches their own. It is thus likely that assortative mating by phenotype matching has facilitated the origin and persistence of benthic and limnetic threespine sticklebacks in the face of gene flow.