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男人对精子竞争的反应与增加的宏观营养素摄入量和缩短寿命相关的风险
Leigh W Simmons1, Hwei-Ling Chan1
1Centre for Evolutionary Biology, School of Biological Sciences, The University of Western Australia, Crawley 6009, Australia.
Biology letters
|October 24, 2023
概括
面对精子竞争的雄性增加了射精支出,消耗更多的营养素. 这种战略性射精导致更快的发育和更短的寿命,揭示了繁殖的成本.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 动物行为 动物行为
背景情况:
- 当男性面临精子竞争时,男性往往会增加射精支出.
- 这种战略性射精被认为会对未来的繁殖产生成本,但这些生命历史成本的理解很少.
- 巨量营养素的摄入量会影响生殖和寿命之间的权衡.
研究的目的:
- 为了调查宏观营养素摄入是否调解雄性 (Teleogryllus oceanicus) 的战略性射精支出.
- 为了确定战略性射精是否会导致寿命缩短的成本.
- 检查与战略性射精相关的机制和生命史成本.
主要方法:
- 雄性 (Teleogryllus oceanicus) 在他们的整个生命周期中都暴露在竞争曲 (竞争环境) 或无声环境 (非竞争环境) 中.
- 监测了宏观营养素 (蛋白质和碳水化合物) 的摄入量.
- 测量了发育时间,射精质量和寿命.
主要成果:
- 在竞争环境中的男性显示蛋白质和碳水化合物摄入量增加.
- 暴露于对手歌曲的男性更早达到成年期,并产生更高质量的射精.
- 竞争环境中的雄性与静音环境中的雄性相比,寿命显著缩短.
结论:
- 雄性的战略性射精支出是由增加的宏观营养素摄入量介导的.
- 在精子竞争下增加对射精的投资,以减少寿命为代价.
- 这项研究为战略性射精的机制和生命史成本提供了罕见的证据.
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