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The role of genetic constraints and social environment in explaining female extra‐pair mating
Evolution ( IF 3.3 ) Pub Date : 2020-01-11 , DOI: 10.1111/evo.13905
Daiping Wang 1 , Wolfgang Forstmeier 1 , Katrin Martin 1 , Alastair Wilson 2 , Bart Kempenaers 1
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Why do females of socially monogamous species engage in extra‐pair copulations? This long‐standing question remains a puzzle, because the benefits of female promiscuous behavior often do not seem to outweigh the costs. Genetic constraint models offer an answer by proposing that female promiscuity emerges through selection favoring alleles that are either beneficial for male reproductive success (intersexual pleiotropy hypothesis) or beneficial for female fecundity (intrasexual pleiotropy hypothesis). A previous quantitative genetic study on captive zebra finches, Taeniopygia guttata, reported support for the first, but not for the second hypothesis. Here, we re‐examine both hypotheses based on data from lines selected for high and low male courtship rate. In contrast to previous conclusions, our new analyses clearly reject the hypothesis that male and female promiscuity are genetically homologous traits. We find some support for a positive genetic correlation between female promiscuity and fecundity. This study also shows that the behavioral outcome of extra‐pair courtships primarily depends on individual‐specific female preferences and not on the “attractiveness” of the social mate. In contrast, patterns of paternity are strongly influenced by the social partner and the pair bond, presumably reflecting variation in copulation behavior, fertility, or sperm competitiveness.

中文翻译:

遗传限制和社会环境在解释雌性异性交配中的作用

为什么社会一夫一妻制物种的雌性进行额外的交配?这个长期存在的问题仍然是一个谜,因为女性滥交行为的好处似乎并不超过代价。遗传约束模型提供了一个答案,提出女性滥交是通过选择有利于男性生殖成功(间性多效性假说)或有利于女性生育能力(性内多效性假说)的等位基因而出现的。先前对圈养斑胸草雀 Taeniopygia guttata 的定量遗传研究报告支持第一个假设,但不支持第二个假设。在这里,我们根据为高和低男性求爱率选择的线的数据重新检查这两种假设。与之前的结论相反,我们的新分析显然拒绝了男性和女性滥交是基因同源性状的假设。我们发现一些支持女性滥交和生育能力之间的正遗传相关性。这项研究还表明,双外求爱的行为结果主要取决于个体特定的女性偏好,而不是社交伴侣的“吸引力”。相比之下,亲子关系模式受社会伙伴和夫妻关系的强烈影响,大概反映了交配行为、生育能力或精子竞争力的变化。这项研究还表明,双外求爱的行为结果主要取决于个体特定的女性偏好,而不是社交伴侣的“吸引力”。相比之下,亲子关系模式受社会伙伴和夫妻关系的强烈影响,大概反映了交配行为、生育能力或精子竞争力的变化。这项研究还表明,双外求爱的行为结果主要取决于个体特定的女性偏好,而不是社交伴侣的“吸引力”。相比之下,亲子关系模式受社会伙伴和夫妻关系的强烈影响,大概反映了交配行为、生育能力或精子竞争力的变化。
更新日期:2020-01-11
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