在具有高水平交配失败的昆虫中,交配后的性选择
Vicki L Balfour1, Mélissa Armand1,2, David M Shuker1
1School of Biology University of St Andrews St Andrews UK.
Ecology and evolution
|October 18, 2024
概括
性选择涉及多个相互作用的过程. 在种子虫中,神秘的雄性选择更大的雌性和精子竞争都影响繁殖,但在很大程度上独立行动.
科学领域:
- 进化生物学 进化生物学
- 行为生态学 行为生态学
- 性选择性选择性选择
背景情况:
- 性选择包括各种各样的过程,它们可以以复杂的方式相互作用.
- 在种子虫*Lygaeus simulans*中,有限的交配前选择与大量的交配后选择形成鲜明对比,包括频繁的交配失败.
- 以前的研究表明,神秘的男性选择更喜欢更大,更生育的女性.
研究的目的:
- 为了研究神秘的男性选择与Lygaeus simulans*中的精子竞争之间的相互作用.
- 确定男性和女性体型如何影响生殖成功和父权份额.
主要方法:
- 试验性操纵男性和女性的大小变化成大小类.
- 双重交配的雌性与雄性跨越所有尺寸组合.
- 使用可见的突变标记来确定父亲身份.
- 分析交配时间对授精成功和父权的影响.
主要成果:
- 精子竞争的结果主要取决于交配的持续时间;较长的交配增加了男性的父权份额.
- 更大的雌性有更高的后代产量,这与更长的交配时间和减少交配失败有关.
- 较大的雄性在精子竞争中略有优势,特别是在第二次交配时.
- 雌性体型对父亲的直接影响很小,这表明选择过程的独立作用.
结论:
- 神秘的男性对女性体型的选择和精子竞争在Lygaeus simulans中相对独立.
- 交配的持续时间是一个关键因素,它介绍了交配的成功和父亲的份额.
- 了解不同性选择组件的相互作用对于进化动态至关重要.
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