Relative Brain Size Is Predicted by the Intensity of Intrasexual Competition in Frogs

Relative Brain Size Is Predicted by the Intensity of Intrasexual Competition in Frogs
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青蛙的相对大脑大小是通过两性竞争的强度来预测的

DOI:
10.1086/709465
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发表时间:
2020-06
影响因子:
2.9
通讯作者:
er
er
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Mai Chun Lan;Liao Wen Bo;Luepold Stefan;Kotrschal Alex;er

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对配偶的竞争是一种塑造性状进化的强大力量。例如,更好的认知能力可能在雄性之间的竞争中是有益的,因此可以通过性内选择来选择。另一方面,对有利于男性在配偶竞争中表现的身体属性的投资可能会降低大脑发育的可用资源,而更激烈的男性配偶竞争将与更小的大脑相一致。到目前为止,只有间接的证据存在这种关系,大多数研究都严重偏向灵长类动物和其他恒温脊椎动物。我们测试了N=30种中国无尾两栖类的雄性大脑大小(相对于身体大小)和雄性-雄性竞争之间的关联。雄性交配竞争强度的三个指标-操作性比(OSR),产卵场密度,和男性前肢肌肉质量-与相对大脑大小呈正相关,而绝对产卵组的大小没有。与OSR和男性前肢肌肉质量的关系是男性比女性的大脑更强。总的来说,我们的研究结果表明,更大的大脑增加的认知能力在男性之间的竞争中是有益的。这项研究增加了分类学的广度,越来越多的证据表明性选择在脊椎动物大脑进化中的重要作用。
Competition over mates is a powerful force shaping trait evolution. For instance, better cognitive abilities may be beneficial in male-male competition and thus be selected for by intrasexual selection. Alternatively, investment in physical attributes favoring male performance in competition for mates may lower the resources available for brain development, and more intense male mate competition would coincide with smaller brains. To date, only indirect evidence for such relationships exists, and most studies are heavily biased toward primates and other homoeothermic vertebrates. We tested the association between male brain size (relative to body size) and male-male competition across N=30 species of Chinese anurans. Three indicators of the intensity of male mate competition—operational sex ratio (OSR), spawning-site density, and male forelimb muscle mass—were positively associated with relative brain size, whereas the absolute spawning group size was not. The relationship with the OSR and male forelimb muscle mass was stronger for the male than for the female brains. Taken together, our findings suggest that the increased cognitive abilities of larger brains are beneficial in male-male competition. This study adds taxonomic breadth to the mounting evidence for a prominent role of sexual selection in vertebrate brain evolution.
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