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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Sperm Evolve Speed In Promiscuous Fish
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Sperm Evolve Speed In Promiscuous Fish

机译：混杂鱼的精子进化速度

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In species where promiscuous mating is common, evolutionary theory predicts that sperm would evolve to become more competitive, swimming faster in the race to fertilize eggs. To date, however, experimental evidence of this theory has been mixed.rnJohn Fitzpatrick et al. studied African cichlid fish and confirm the theory for these fishes. Cichlids are a diverse group of fish, whose mating behavior varies widely, and those in East African lakes have helped researchers understand the fishes' explosive speciation. The authors collected specimens from Lake Tanganyika and were able to correlate cichlid promiscuity with faster and larger sperm. Sperm speed was also positively linked to sperm size across 29 cichlid species (although the speed-size link did not hold up within individual species). Contrary to their expectations, Fitzpatrick et al. found no tradeoffs between sperm size, longevity, or number in the transition to greater speed, possibly because the fish are compensating in another, currently unknown, area. The authors' say their phylogenetic reconstruction also confirms that promiscuous behavior, and therefore mating competition, drove the evolution of faster, bigger cichlid sperm.
机译：在混杂交配很常见的物种中，进化理论预测，精子将进化为更具竞争性，在受精卵竞争中游得更快。然而，迄今为止，该理论的实验证据还很复杂。约翰·菲茨帕特里克等人。研究了非洲丽鱼科鱼，并证实了这些鱼的理论。丽鱼科鱼类是各种各样的鱼类，它们的交配行为差异很大，东非湖泊中的鱼类帮助研究人员了解了这些鱼类的爆炸性物种。作者从坦any尼喀湖采集了标本，并能够将丽鱼科鱼的滥交与更快和更大的精子联系起来。精子速度还与29个丽鱼科动物的精子大小呈正相关（尽管速度-大小链接在单个物种中不成立）。与他们的期望相反，Fitzpatrick等。发现在向更高速度过渡的过程中，精子大小，寿命或数量之间没有权衡取舍，这可能是因为鱼在另一个未知区域进行了补偿。作者说，他们的系统发育重建也证实了滥交行为以及因此而来的交配竞争推动了更快，更大丽鱼科鱼精子的进化。

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