Adjustment of sperm allocation under high risk of sperm competition across taxa: a meta-analysis
Adjustment of sperm allocation under high risk of sperm competition across taxa: a meta-analysis
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DOI：
10.1111/j.1420-9101.2011.02293.x
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发表时间：
2011-08-01
影响因子：
2.1
通讯作者：
delBarco-Trillo, J.
中科院分区：
文献类型：
--
作者：
delBarco-Trillo, J.
精子竞争理论预测，在精子竞争的高风险下，雄性会增加分配给雌性的精子数量。这一预测得到了一些实验研究的支持，但没有得到其他研究的支持。在这里，我进行了一项荟萃分析，以确定在精子竞争的高风险下，精子分配的增加是否是一个跨分类群的普遍反应。我收集了39项研究和37个物种的数据。在所有分类群中，精子竞争风险高的男性通过增加精子分配来应对（平均效应量= 0.32）。后代的数量不能解释效应量变异的显著部分。一个传统的荟萃分析（即没有系统发育信息）描述的影响大小之间的变化比荟萃分析，纳入物种之间的系统发育关系，这表明精子分配的增加，精子竞争的高风险下，是同样普遍的类群。
Sperm competition theory predicts that under high risk of sperm competition, males will increase the number of sperm that they allocate to a female. This prediction has been supported by some experimental studies but not by others. Here, I conducted a meta-analysis to determine whether the increase in sperm allocation under high risk of sperm competition is a generalized response across taxa. I collected data from 39 studies and 37 species. Across taxa, males under a high risk of sperm competition respond by increasing their sperm allocation (mean effect size = 0.32). Number of offspring did not explain a significant portion of the variation in effect sizes. A traditional meta-analysis (i.e. without phylogenetic information) described the variation among effect sizes better than a meta-analysis that incorporates the phylogenetic relationships among species, suggesting that the increase in sperm allocation under high risk of sperm competition is similarly prevalent across taxa.