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Selection on sperm morphology under relaxed sperm competition in a wild passerine bird

机译:野生雀形目鸟精子竞争下精子形态的选择

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摘要

Theories regarding the role of sexual selection on the evolution of sperm traits are based on an association between pre-copulatory (e.g. female preference) and post-copulatory (e.g. ejaculate quality) male reproductive traits. In tests of these hypotheses, sperm morphology has rarely been used, despite its high heritability and intra-individual consistency. We found evidence of selection for longer sperm through positive phenotypic associations between sperm size and the two major female preference traits in the pied flycatcher, Ficedula hypoleuca. Our results support the sexually selected sperm hypothesis in a species under low sperm competition and demonstrate that natural and pre-copulatory sexual selection forces should not be overlooked in studies of intraspecific sperm morphology evolution.
机译:关于性选择对精子性状进化的作用的理论是基于交配前(例如女性偏爱)和交配后(例如射精)男性生殖特性之间的联系。在这些假设的检验中,尽管具有高遗传力和个体内一致性,但很少使用精子形态。我们发现,通过精子大小和捕蝇器Ficedula hypoleuca的两个主要女性偏好性状之间的正表型关联,可以选择更长的精子。我们的结果支持在低精子竞争下的物种中按性别选择的精子假设,并证明自然和交配前的性选择力在种内精子形态演变研究中不应被忽略。

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