期刊
EVOLUTION
卷 75, 期 11, 页码 2867-2880出版社
OXFORD UNIV PRESS
DOI: 10.1111/evo.14371
关键词
Ageing; competition; mating experience; postcopulatory; reproductive senescence; sexual selection
资金
- Australian Research Council [DP160100285, DP190100279]
Using eastern mosquitofish for experiments, this study found that old males and males with no mating experience spent more time approaching females and attempting to mate than young males and those with greater mating experience. Old males benefited from previous mating experience, while young males did not.
Many studies ask whether young or older males are better at acquiring mates. Even so, how age affects reproductive success is still poorly understood because male age and mating history are confounded in most studies: older males usually have more mating experience. To what extent does mating history rather than age explain variation in male mating success? And how do mating history and male age determine paternity when there is also postcopulatory sexual selection? Here, we experimentally manipulated the mating history of old and young males in the eastern mosquitofish (Gambusia holbrooki). We then recorded male mating behavior and share of paternity (1259 offspring from 232 potential sires) when they competed for mates and fertilizations. Old males, and males with no mating experience, spent significantly more time approaching females, and attempting to mate, than did young males and those with greater mating experience. Male age and mating history interacted to affect paternity: old males benefited from having previous mating experience, but young males did not. Our results highlight that the age-related changes in male reproductive traits and in paternity that have been described in many taxa may be partly attributable to male mating history and not simply to age itself.
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