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首页> 外文期刊>Behavioral Ecology and Sociobiology >A novel, sexually selected trait in poeciliid fishes: female preference for mustache-like, rostral filaments in male Poecilia sphenops
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A novel, sexually selected trait in poeciliid fishes: female preference for mustache-like, rostral filaments in male Poecilia sphenops

机译：一种新的，按性别选择的性状在拟真鱼类中：雄性Poecilia sphenops中雌性偏爱像胡子一样的鼻状细丝

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摘要

Female choice can often drive the elaboration of male traits, leading to the evolution of secondary sexual traits. In the Mexican molly, Poecilia sphenops (Poeciliidae), some males exhibit a mustache-like structure on the upper maxilla, the function of which has not been previously recognized. The mustache consists of epidermal outgrowths at the edge of the scales that appear to have no sensory function. Trait expression varies within as well as among populations of P. sphenops, but is not linked to male body size polymorphism. In mate choice experiments, female P. sphenops exhibited a visual mating preference for males with mustaches, suggesting that the trait may be sexually selected. Since the mating behavior of P. sphenops involves contact of the male’s snout and the female genital region prior to copulation, we hypothesize that the mustache may also convey tactile signals to the female.
机译：女性的选择通常可以推动男性特征的形成，从而导致次要性特征的演变。在墨西哥软体动物Poecilia sphenops（Poeciliidae）中，一些雄性上颌上部表现出类似胡须的结构，其功能此前尚未被认识到。小胡子由鳞片边缘的表皮生长物组成，似乎没有感觉功能。性状的表达在斑节对虾的种群内以及种群之间变化，但与男性体型多态性无关。在配偶选择实验中，雌性P. sphenops对有胡子的雄性显示出视觉交配偏好，表明该性状可能是按性别选择的。由于斑节对虾的交配行为涉及在交配之前雄性的鼻子和雌性的生殖器官的接触，因此我们假设小胡子也可能向雌性传递触觉信号。

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