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首页> 外文期刊>Behavioural processes >Last male wins the egg fertilization fight: A case study in ladybird, Menochilus sexmaculatus
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Last male wins the egg fertilization fight: A case study in ladybird, Menochilus sexmaculatus

机译：最后雄性赢得蛋精抗战：以瓢虫，Menochilus Sexmaculatus为例

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Sexual selection and the mechanisms involved in sperm competition have not been greatly explored in ladybird beetles. The present study was conducted to investigate the processes of sperm competition and the role of mate guarding behaviour in its regulation in ladybird beetles. We investigated these questions in polyandrous females of the ladybird, Menochilus sexmaculatus (Coleoptera: Coccinellidae) using a phenotypic marker (typical and intermediate morph) to assess paternity of offspring; to determine sperm competition. We conducted two double mating experiments: (i) complete first and second matings, and (ii) disrupted first and complete second matings each using homomorphic and heteromorphic pairing in alternation. Males which mated last were found to sire up to 72% of the offspring produced, indicating last male sperm precedence. Morph itself, independent of mating order, did not have a significant effect on proportion of offspring sired. Paternity share of the last male was negatively associated with mating duration of the first male; mating duration of the first male being indicative of mate guarding. This therefore indicates that prolonged matings by first males are essentially examples of post-copulatory mate guarding to prevent last male sperm precedence. (C) 2016 Elsevier B.V. All rights reserved.
机译：在瓢虫甲虫中，精神竞争所涉及的性别选择和涉及的机制并未大大探索。进行了本研究以调查精子竞争的过程以及伴侣守卫行为在瓢虫甲虫中规例中的作用。我们在瓢虫（Cocoptera：Coccinellidae）的瓢虫（殖民植物：Coccinellidae）的瓢虫女性中调查了这些问题，使用了表型标志物（典型的和中间变形）来评估后代的亲子;确定精子竞争。我们进行了两次双交配实验：（i）完成第一和第二聚合物，（ii）在交替中使用同态和异常配对时突破并完成第二垫。将上次交配的男性最高可达72％的后代，表明最后的男性精子优先。变形本身独立于交配秩序，对后代的比例没有显着影响。最后一个男性的父级份额与第一个男性的交配持续时间负相关;交配第一个男性的持续时间指示伴侣守卫。因此，这表明第一名雄性的延长的果实基本上是分组后伴侣守卫的实例，以防止最后的男性精子优先于优先级。 （c）2016年Elsevier B.v.保留所有权利。

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