Selection on female remating interval is influenced by male sperm competition strategies and ejaculate characteristics
Selection on female remating interval is influenced by male sperm competition strategies and ejaculate characteristics
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DOI：
10.1098/rstb.2012.0044
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发表时间：
2013-03-05
影响因子：
6.3
通讯作者：
Pizzari, Tommaso
中科院分区：
文献类型：
--
作者：
Alonzo, Suzanne H.;Pizzari, Tommaso
雌性的再交配率决定了种群中精子竞争的水平，广泛的研究集中在精子竞争如何产生对雄性射精分配的选择。然而，射精分配策略的方式反过来又产生对女性再交配率的选择，最终影响精子竞争的水平，尽管越来越多的证据表明交配本身和射精性状影响女性健身的多个组成部分，但受到的关注要少得多。在这里，我们发展理论来研究如何交配对女性生育力，繁殖力和死亡率的影响相互作用，以产生选择女性再交配率。当雄性产生更多的精液时，雌性被选择交配频率较低，从而降低了精子竞争的水平。这可能反过来有利于减少男性射精分配，这可能随后导致更高的女性再交配。当再次交配同时增加女性生殖力和死亡率，女性被选择更频繁地交配，从而加剧精子竞争和有利于男性的特点，传达了竞争优势，即使有害于女性的生存。虽然直观的单独考虑时，这些预测表明，男性射精支出和女性再交配率之间的复杂的协同进化动力学的潜力，以及多个男性和女性的生殖性状影响交配，生育力和繁殖力的相关进化。
Female remating rate dictates the level of sperm competition in a population, and extensive research has focused on how sperm competition generates selection on male ejaculate allocation. Yet the way ejaculate allocation strategies in turn generate selection on female remating rates, which ultimately influence levels of sperm competition, has received much less consideration despite increasing evidence that both mating itself and ejaculate traits affect multiple components of female fitness. Here, we develop theory to examine how the effects of mating on female fertility, fecundity and mortality interact to generate selection on female remating rate. When males produce more fertile ejaculates, females are selected to mate less frequently, thus decreasing levels of sperm competition. This could in turn favour decreased male ejaculate allocation, which could subsequently lead to higher female remating. When remating simultaneously increases female fecundity and mortality, females are selected to mate more frequently, thus exacerbating sperm competition and favouring male traits that convey a competitive advantage even when harmful to female survival. While intuitive when considered separately, these predictions demonstrate the potential for complex coevolutionary dynamics between male ejaculate expenditure and female remating rate, and the correlated evolution of multiple male and female reproductive traits affecting mating, fertility and fecundity.