Operational sex ratio influences female preference and male-male competition in guppies
Operational sex ratio influences female preference and male-male competition in guppies
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DOI：
10.1006/anbe.1999.1149
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发表时间：
1999-08-01
期刊：
影响因子：
2.5
通讯作者：
Jirotkul, M
中科院分区：
文献类型：
--
作者：
Jirotkul, M
对孔雀鱼（Poecilia reticulata）的操作性别比（OSR）的操纵导致了雄性竞争和雌性配偶选择的变化。在这项研究中，OSR被定义为性活跃的男性数量除以性活跃的两性成年人总数。在雄性偏倚的osr中，雄性的求偶表现率下降，雄性之间的干扰行为增加。OSR影响了交配策略和交配后的保护。所有的交配都遵循s形显示，除了在5雄1雌的OSR中，60%的交配发生在潜行尝试中。与乙形显示后的交配相比，成功的潜行交配后，雄性恢复求偶活动前的交配后守护配偶的时间更短，不应期更短。每当有选择的机会时，女性更喜欢橙色较多的男性，而且男性偏向的osr越多，女性对橙色的偏好就越强烈。因此，OSR会影响雌性配偶选择和雄性竞争的存在与否或相对重要性，而这反过来又会影响第二性征的进化。(C) 1999动物行为研究协会。
Manipulation of the operational sex ratio (OSR) in guppies, Poecilia reticulata, causes changes in male-male competition and female mate choice. In this study OSR is defined as the number of sexually active males divided by the total number of sexually active adults of both sexes. The rate of male courtship displays decreased, and interference behaviours between males increased, at male-biased OSRs. The OSR influenced both copulatory tactics and postcopulatory guarding. All copulations followed sigmoid displays, except at an OSR of five males to one female where 60% of copulations occurred during sneak attempts. Compared with copulations that followed sigmoid displays, successful sneak copulations were followed by a shorter period of postcopulatory mate guarding and a shorter refractory period before males resumed courtship activities. Females preferred males with more orange colour whenever they had a choice, and the preference for orange colour was stronger with more male-biased OSRs. The OSR thus influences the presence, absence or relative importance of both female mate choice and male-male competition which, in turn, should affect the evolution of secondary sexual traits. (C) 1999 The Association for the Study of Animal Behaviour.