Sex–specific, counteracting responses to inbreeding in a bird
Sex–specific, counteracting responses to inbreeding in a bird
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鸟类对近亲繁殖的性别特异性、抵消反应
DOI：
10.1098/rspb.2004.2843
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Charlie K. Cornwallis
中科院分区：
文献类型：
--
作者：
T. Pizzari;H. Løvlie;Charlie K. Cornwallis
近亲繁殖往往会降低后代的适应性。由于雌性在一次繁殖活动中比雄性投入更多，近亲繁殖对母亲的成本预计会比父亲高，这就造成了两性之间的生殖利益分歧，促进了性别特异性的近亲繁殖策略。雄性和雌性可能通过选择交配对象来偏向近亲繁殖的可能性，并且，在性混杂的物种中，通过雄性对不同雌性的战略精子投资和雌性对不同雄性的精子选择。然而，这些过程通常很难研究，而且不同的雄性和雌性策略相互作用决定近亲繁殖的方式仍然知之甚少。在这里，我们展示了性别特异性的，对近亲繁殖的对抗反应在滥交的红丛林鸟，Gallus Gallus。首先，雄性与同父异母的姐妹交配的可能性与与自己无关的雌性交配的可能性是一样的。此外，雄性表现出：(1)与不相关的雌性接触时比与姐妹接触时更快地开始交配；(2)与不相关的雌性相比，将更多的精子植入姐妹体内。其次，雌性在兄弟授精后保留的精子较少，从而降低了近亲繁殖的风险，抵消了雄性的近亲繁殖策略。
Inbreeding often depresses offspring fitness. Because females invest more than males in a reproductive event, inbreeding is expected to be more costly to mothers than fathers, creating a divergence between the reproductive interests of each sex and promoting sex–specific inbreeding strategies. Males and females may bias the probability of inbreeding by selecting copulation partners, and, in sexually promiscuous species, through male strategic sperm investment in different females and female selection of the sperm of different males. However, these processes are often difficult to study, and the way that different male and female strategies interact to determine inbreeding remains poorly understood. Here we demonstrate sex–specific, counteracting responses to inbreeding in the promiscuous red junglefowl, Gallus gallus. First, a male was just as likely to copulate with his full–sib sister as with an unrelated female. In addition, males displayed a tendency to: (i) initiate copulation faster when exposed to an unrelated female than when exposed to a sister, and (ii) inseminate more sperm into sisters than into unrelated females. Second, females retained fewer sperm following insemination by brothers, thus reducing the risk of inbreeding and counteracting male inbreeding strategies.
DOI：
10.1073/pnas.060284797
发表时间：
2000-03-28
影响因子：
11.1
作者：
Meagher, S;Penn, DJ;Potts, WK
通讯作者：
Potts, WK