Male mate preference against tail‐elongated females in the barn swallow
Male mate preference against tail‐elongated females in the barn swallow
复制标题
家燕中雄性对尾部拉长的雌性的择偶偏好
作者：
Hasegawa Masaru;Arai Emi
雌性纹饰在性选择中的作用越来越受到关注，但实地研究大多基于交配模式等间接测量；在控制混杂因素的情况下，需要直接证据证明雄性配偶对雌性装饰的偏好。本文通过模型呈现实验，研究了雌雄选择模式物种褐家燕的雄性择偶偏好。虽然仓燕的雌尾比雄尾短，但它们仍然很长，表明雌性的品质，可能是由于装饰成本的差异。尽管在过去的三十年里，许多有关雌性活燕的相关研究和实验研究都集中在雌性仓燕的长尾巴上，但缺乏对雄性配偶偏好的直接行为测试。在我们的序列模型展示实验中，我们用相同的雄性重复了这些实验，我们发现，与对照组相比，当雄性看到尾巴拉长的雌性模型时，它们明显减少了配对展示的次数。处理与雄尾长的交互作用不显著。观察到的模式与主流观点不一致，即雌性的纹饰是通过雄性对更多纹饰的雌性的偏好来维持的；相反，这与性模仿假说是一致的，即女性可以通过模仿男性来避免性骚扰和社会骚扰。
The function of female ornamentation in (inter)sexual selection is attracting increasing attention, but empirical field studies are mostly based on indirect measures such as mating patterns; direct evidence of male mate preference on female ornamentation while controlling for confounding factors is needed. Here, we performed model presentation experiments to study male mate preference in the barn swallowHirundo rustica,a model species of sexual selection. Although female tails are shorter than male tails in the barn swallow, they are still long and indicate female quality, possibly due to the differential costs of ornamentation. Although many correlational and experimental studies of live females have focused on long tails in female barn swallows over the last three decades, direct behavioral tests of male mate preference are lacking. In our sequential model presentation experiment, in which we repeated the trials with the same males, we found that males significantly reduced the number of pairing displays when presented with tail‐elongated female models compared to controls. The interaction between treatment and male tail length was far from significant. The observed pattern is inconsistent with the prevailing view that female ornamentation is maintained via male preference for more ornamented females; rather, it is consistent with the sexual mimicry hypothesis, in which females can avoid sexual and social harassment by mimicking males.