Dynamic resource allocation between pre- and postcopulatory episodes of sexual selection determines competitive fertilization success
Dynamic resource allocation between pre- and postcopulatory episodes of sexual selection determines competitive fertilization success
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性选择交配前和交配后事件之间的动态资源分配决定了竞争性受精的成功
DOI：
10.1098/rspb.2015.1279
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Bakker
中科院分区：
文献类型：
--
作者：
Mehlis;Bakker
在多雄交配系统中，雄性生殖成功取决于交配前的求偶特征和交配后的精子竞争能力。关于这些特征之间相互作用的经验数据是不一致的;揭示了积极的，消极的或没有关系。一般认为，交配前后性状的投资是由环境条件介导的。为了测试食物资源的可利用性如何影响三刺鱼（Gasterosteus aculeatus）的性取向、精子质量及其相互关系，在三种不同食物数量和/或质量（即类胡萝卜素含量）的条件下饲养全同胞组：（i）高数量/高质量，（ii）高数量/低质量或（iii）低数量/低质量。经过1年的喂养，食物限制的男性开发了更强烈的繁殖着色和更快的精子相比，他们的良好喂养的兄弟，这表明他们分配相对更多的前和交配后的性状。此外，在精子竞争试验中，它们以相同数量的竞争精子击败了营养良好、补充了类胡萝卜素的兄弟，这表明食物限制的雄性最大限度地提高了它们目前的繁殖成功率。这可能导致未来生殖机会减少，因为食物限制的男性死亡率较高，整体体型缩小，可用于受精的精子数量减少。根据理论，在前和交配后性状的投资之间的权衡观察到在食物限制的男性，而营养良好的男性能够分配到这两个特征，导致显着的正相关关系。
In polyandrous mating systems, male reproductive success depends on both mate-acquisition traits (precopulatory) and sperm competitive abilities (postcopulatory). Empirical data on the interaction between these traits are inconsistent; revealing positive, negative or no relationships. It is generally expected that the investment in pre- and postcopulatory traits is mediated by environmental conditions. To test how dietary resource availability affects sexual ornamentation, sperm quality and their interrelationship in three-spined sticklebacks (Gasterosteus aculeatus), full-sibling groups were raised under three conditions differing in food quantity and/or quality (i.e. carotenoid content): (i) high-quantity/high-quality, (ii) high-quantity/low-quality or (iii) low-quantity/low-quality. After 1 year of feeding, food-restricted males developed a more intense breeding coloration and faster sperm compared with their well-fed brothers, indicating that they allocated relatively more in pre- and postcopulatory traits. Moreover, they outcompeted their well-fed, carotenoid-supplemented brothers in sperm competition trials with equal numbers of competing sperm, suggesting that food-restricted males maximize their present reproductive success. This may result in reduced future reproductive opportunities as food-restricted males suffered from a higher mortality, had an overall reduced body size, and sperm number available for fertilization. In accordance with theory, a trade-off between the investment in pre- and postcopulatory traits was observed in food-restricted males, whereas well-fed males were able to allocate to both traits resulting in a significantly positive relationship.
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