Evolution & Ecology Research Centre and School of Biological, Earth and Environmental Sciences, The University of New South Wales, Kensington, Sydney 2052, Australia.
Evolution. 2010 May;64(5):1273-82. doi: 10.1111/j.1558-5646.2009.00904.x. Epub 2009 Nov 20.
Although there is continuing debate about whether sexual selection promotes or impedes adaptation to novel environments, the role of mating behavior in such adaptation remains largely unexplored. We investigated the evolution of mating behavior (latency to mating, mating probability and duration) in replicate populations of seed beetles Callosobruchus maculatus subjected to selection on life-history ("Young" vs. "Old" reproduction) under contrasting regimes of sexual selection ("Monogamy" vs. "Polygamy"). Life-history selection is predicted to favor delayed mating in "Old" females, but sexual conflict under polygamy can potentially retard adaptive life-history evolution. We found that life-history selection yielded the predicted changes in mating behavior, but sexual selection regime had no net effect. In within-line crosses, populations selected for late reproduction showed equally reduced early-life mating probability regardless of mating system. In between-line crosses, however, the effect of life-history selection on early-life mating probability was stronger in polygamous lines than in monogamous ones. Thus, although mating system influenced male-female coevolution, removal of sexual selection did not affect the adaptive evolution of mating behavior. Importantly, our study shows that the interaction between sexual selection and life-history selection can result in either increased or decreased reproductive divergence depending on the ecological context.
尽管关于性选择是否促进或阻碍对新环境的适应仍存在持续的争论，但交配行为在这种适应中的作用在很大程度上仍未得到探索。我们研究了在具有不同性选择制度（“一夫一妻制”与“多夫制”）的条件下，对生活史（“年轻”对“年老”生殖）进行选择的复制种群中，种子象鼻虫 Callosobruchus maculatus 的交配行为（交配潜伏期、交配概率和持续时间）的进化。生活史选择预计会有利于“年老”雌性的交配延迟，但多夫制下的性冲突可能会延迟适应性生活史进化。我们发现，生活史选择产生了交配行为的预期变化，但性选择制度没有产生净效应。在同系交配中，无论交配制度如何，选择晚繁殖的种群都表现出同样减少的早期交配概率。然而，在不同系交配中，生活史选择对早期交配概率的影响在多夫制系中比在一夫一妻制系中更强。因此，尽管交配制度影响了雌雄同体的共同进化，但去除性选择并没有影响交配行为的适应性进化。重要的是，我们的研究表明，性选择和生活史选择之间的相互作用可能会导致生殖分歧增加或减少，具体取决于生态背景。
