Adaptive plasticity in female mate choice dampens sexual selection on male ornaments in the lark bunting
Adaptive plasticity in female mate choice dampens sexual selection on male ornaments in the lark bunting
复制标题
DOI：
10.1126/science.1149167
复制
发表时间：
2008-01-25
期刊：
影响因子：
56.9
通讯作者：
Lyon, Bruce E.
中科院分区：
文献类型：
--
作者：
Chaine, Alexis S.;Lyon, Bruce E.
关于通过性别选择来进化观赏性男性特征的理论假定随着时间的推移，选择是一致的。女性选择的时间变化可能会抑制性别选择，但关于女性个人偏好的灵活性程度的信息很少。在这里，我们展示了百灵鸟对雄性性状的性别选择在不同年份之间变化很大，在某些情况下，在单一性状的选择方向上表现出逆转。我们发现，这些变化可能是因为女性个体在选择配偶方面的灵活性，以及它们与预测某一年女性生殖成功的男性特征的变化平行。随着时间的推移，选择的可塑性和交配模式的逆转可能会削弱性选择的强度，并可能保持多种性装饰的遗传变异。
Theory on the evolution of ornamental male traits by sexual selection assumes consistency in selection over time. Temporal variation in female choice could dampen sexual selection, but scant information exists on the degree to which individual female preferences are flexible. Here we show that in lark buntings sexual selection on male traits varied dramatically across years and, in some cases, exhibited reversals in the direction of selection for a single trait. We show that these shifts are probably because of flexibility in mate choice by individual females and that they parallel shifts in the male traits that predict female reproductive success in a given year. Plasticity in choice and concomitant reversals in mating patterns across time may weaken the strength of sexual selection and could maintain genetic variation underlying multiple sexual ornaments.