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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Female Promiscuity Promotes The Evolution Of Faster Sperm In Cichlid Fishes
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Female Promiscuity Promotes The Evolution Of Faster Sperm In Cichlid Fishes

机译：女性滥交促进丽鱼科鱼类更快精子的进化

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摘要

Sperm competition, the contest among ejaculates from rival males to fertilize ova of a female, is a common and powerful evolutionary force influencing ejaculate traits. During competitive interactions between ejaculates, longer and faster spermatozoa are expected to have an edge; however, to date, there has been mixed support for this key prediction from sperm competition theory. Here, we use the spectacular radiation of cichlid fishes from Lake Tanganyika to examine sperm characteristics in 29 closely related species. We provide phylogenetically robust evidence that species experiencing greater levels of sperm competition have faster-swimming sperm. We also show that sperm competition selects for increases in the number, size, and longevity of spermatozoa in the ejaculate of a male, and, contrary to expectations from theory, we find no evidence of trade-offs among sperm traits in an interspecific analysis. Also, sperm swimming speed is positively correlated with sperm length among, but not within, species. These different responses to sperm competition at intra- and interspecific levels provide a simple, powerful explanation for equivocal results from previous studies. Using phylogenetic analyses, we also reconstructed the probable evolutionary route of trait evolution in this taxon, and show that, in response to increases in the magnitude of sperm competition, the evolution of sperm traits in this clade began with the evolution of faster (thus, more competitive) sperm.
机译：精子竞争是雄性对雄性的射精争夺女性卵子的竞争，是影响射精性状的共同而强大的进化力量。在射精之间的竞争性相互作用中，预计更长，更快的精子将具有优势。然而，迄今为止，对于精子竞争理论中的这一关键预测一直有不同的支持。在这里，我们使用坦Tang尼喀湖壮观的丽鱼科鱼类辐射来检查29个密切相关物种的精子特征。我们提供了系统发育上可靠的证据，表明经历更高水平精子竞争的物种具有更快游动的精子。我们还表明，精子竞争选择了男性射精中精子的数量，大小和寿命的增加，并且与理论预期相反，我们在种间分析中未发现在精子性状之间进行权衡的证据。同样，精子游动速度与物种之间（而非物种内部）的精子长度呈正相关。这些对种内和种间水平精子竞争的不同反应，为先前研究的模棱两可的结果提供了一个简单而有力的解释。使用系统发育分析，我们还重建了该分类单元中性状进化的可能进化途径，并表明，随着精子竞争程度的增加，该进化枝中精子性状的进化始于更快的进化（因此，更具竞争力）的精子。

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