The frequency of multiple paternity predicts variation in testes size among island populations of house mice
The frequency of multiple paternity predicts variation in testes size among island populations of house mice
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DOI：
10.1111/j.1420-9101.2008.01612.x
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发表时间：
2008-11-01
影响因子：
2.1
通讯作者：
Simmons, L. W.
中科院分区：
文献类型：
--
作者：
Firman, R. C.;Simmons, L. W.
一妻多夫通过精子竞争产生对雄性的选择，这对射精的进化和雄性生殖解剖学具有广泛的意义。跨物种的比较分析和物种内的竞争性交配试验表明，精子竞争可以影响睾丸大小，精子产量和精子形式和功能的进化。令人惊讶的是，种内的方法比较人口之间的变化，调查精子竞争的选择潜力很少被探索。我们对7个岛屿种群的家鼠进行了采样，并确定了每个种群内多重父系的频率。应用多父性的频率作为精子竞争风险的指标，我们寻找男性生殖性状的选择性反应。我们发现，精子竞争的风险预测了七个岛屿家鼠种群的睾丸大小。然而，精子竞争风险不能解释精子性状的变化。我们结合精子竞争理论以及其他可能影响射精质量的内在和外在因素讨论了这些发现。
Polyandry generates selection on males through sperm competition, which has broad implications for the evolution of ejaculates and male reproductive anatomy. Comparative analyses across species and competitive mating trials within species have suggested that sperm competition can influence the evolution of testes size, sperm production and sperm form and function. Surprisingly, the intraspecific approach of comparing among population variation for investigating the selective potential of sperm competition has rarely been explored. We sampled seven island populations of house mice and determined the frequency of multiple paternity within each population. Applying the frequency of multiple paternity as an index of the risk of sperm competition, we looked for selective responses in male reproductive traits. We found that the risk of sperm competition predicted testes size across the seven island populations of house mice. However, variation in sperm traits was not explained by sperm competition risk. We discuss these findings in relation to sperm competition theory, and other intrinsic and extrinsic factors that might influence ejaculate quality.