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Assessing Differences in Sperm Competitive Ability in Drosophila
Published on: August 22, 2013
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性选择如何驱动昂贵的精子装饰的进化
Stefan Lüpold1,2, Mollie K Manier1,3, Nalini Puniamoorthy1,4
1Center for Reproductive Evolution, Department of Biology, Syracuse University, 107 College Place, Syracuse, New York 13244-1270, USA.
Nature
|May 27, 2016
概括
巨型精子在Drosophila,一种形式的后交配性选择,通过女性选择和遗传相关性进化. 这挑战了关于性选择和性别差异的现有理论.
科学领域:
- 进化生物学
- 性别选择
- 遗传学
背景情况:
- 后交配性选择 (PSS) 驱动精子特征进化,但精子装饰和女性偏好的适应意义仍然不清楚.
- 过分的性特征是常见的, 但巨大的精子在Drosophila代表极端的例子, 挑战当前的进化理论.
- 了解精子长度的演变需要检查遗传相关性和女性的选择.
研究的目的:
- 审查进化的性特征,并突出巨型精子在Drosophila作为极端的装饰.
- 通过定量遗传和比较分析,研究Drosophila melanogaster的精子长度的进化动态.
- 在巨型精子进化过程中, 探索鱼类逃生选择和女性间接利益的作用.
主要方法:
- 跨种类的夸张性特征的进化测量.
- 在Drosophila melanogaster中相互作用的性别特征的定量遗传分析.
- 对不同种类的精子/装饰物大小的雄性和雌性生殖潜力的比较分析.
主要成果:
- 巨型精子是大自然最极端的装饰物之一, 挑战性选择强度和交配系统的理论.
- 精子长度进化受鱼类逃跑选择的影响,由精子长度,雌性偏好和交配频率之间的遗传相关性驱动.
- 更长的精子对女性有间接的好处,
结论:
- 这种生长少量巨型精子的进化是由女性的选择和遗传因素驱动的, 而不是男性的竞争.
- 精子质量和数量的发育整合意味着交配后的性选择将男性竞争和女性选择视为相互关联的过程.
- 这项研究提供了对极端性特征的演变和Drosophila性选择机制的新见解.
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