交配后的性选择使雌性在与衰老的雄性交配时减轻了适应性成本

Pauline Vuarin, Alice Bouchard, L. Lesobre, Gwénaëlle Leveque, T. Chalah, M. S. Jalme, F. Lacroix, Y. Hingrat, G. Sorci
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引用次数: 19

摘要

雄性衰老对生殖成功和后代健康有不利影响。当雌性在同一次繁殖过程中与多个雄性交配时,交配后的性选择,要么通过精子竞争,要么通过隐性的雌性选择,可能会让雌性将受精的成功倾向于年轻雄性,从而限制了卵子被衰老的雄性受精时产生的适应性成本。在这里,我们通过实验验证了这个假设。我们用不同年龄(年轻和年老)或相近年龄(年轻或年老)雄性的精子对雌性北非胡巴拉鸨进行人工授精。然后,我们评估了繁殖成功是否偏向于年轻雄性,并测量了后代的几个生活史特征,以评估由于父亲年龄较大而导致的适应性成本。与预测一致的是,我们发现繁殖成功倾向于年轻雄性,而由年老雄性繁殖的后代(在雌性中)孵化成功率、生长和释放后存活率都受到损害。总的来说,我们的研究结果支持了这样的假设,即交配后的性选择可能是一种有效的机制,允许雌性避免由衰老的伴侣受精的适应性成本。
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Post-copulatory sexual selection allows females to alleviate the fitness costs incurred when mating with senescing males
Male senescence has detrimental effects on reproductive success and offspring fitness. When females mate with multiple males during the same reproductive bout, post-copulatory sexual selection that operates either through sperm competition or cryptic female choice might allow females to skew fertilization success towards young males and as such limit the fitness costs incurred when eggs are fertilized by senescing males. Here, we experimentally tested this hypothesis. We artificially inseminated female North African houbara bustards with sperm from dyads of males of different (young and old) or similar ages (either young or old). Then, we assessed whether siring success was biased towards young males and we measured several life-history traits of the progeny to evaluate the fitness costs due to advanced paternal age. In agreement with the prediction, we found that siring success was biased towards young males, and offspring sired by old males had impaired hatching success, growth and post-release survival (in females). Overall, our results support the hypothesis that post-copulatory sexual selection might represent an effective mechanism allowing females to avoid the fitness costs of fertilization by senescing partners.
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