期刊
ANIMAL BEHAVIOUR
卷 85, 期 4, 页码 751-758出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.anbehav.2013.01.016
关键词
ejaculate allocation; experimental evolution; house mouse; intensity; mating duration; Mus domesticus; paternity success; risk; sperm competition
资金
- Academy of Finland [128222]
- Australian Research Council [DP1094845]
- Australian Research Council [DP1094845] Funding Source: Australian Research Council
- Academy of Finland (AKA) [128222, 128222] Funding Source: Academy of Finland (AKA)
Sperm competition imposes strong selection on males to gain fertilizations and maximize paternity. Males have been shown to adapt to sperm competition by modifying their behaviour and/or reproductive physiology. We investigated the fitness effects of male responses to sperm competition in house mice, Mus domesticus. Males that had been evolving with (polygamy) and without (monogamy) sperm competition for 18 generations were subject to different frequencies of social encounters with conspecific males to generate a sperm competition 'risk' treatment and a 'no risk' treatment. After manipulation of their social environment for 15-22 days, males were forced to compete for fertilizations against a male with the same selection history that experienced no manipulation. We genotyped embryos at 16 days gestation to quantify paternity success, and thus the competitive ability, of the experimental males. While there was no treatment effect on mating behaviour and paternity success, males from polygamous lines had significantly increased mating duration and paternity success when positioned in the disfavoured role of the second male to mate. Thus, males that had evolved with sperm competition showed greater mating effort and fitness compared to males that had evolved without sperm competition. Whether this is due to a genetic divergence between the lines or a differential capacity of males with different selection histories to respond plastically to current levels of sperm competition remains to be tested. (C) 2013 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据