在男性怀孕的演变过程中,交配后的性选择和性冲突
Kimberly A Paczolt1, Adam G Jones
1Department of Biology, 3258 TAMU, Texas A&M University, College Station, Texas 77845, USA. kpaczolt@mail.bio.tamu.edu
Nature
|March 19, 2010
概括
雄性管鱼 (Syngnathidae) 呈现出繁殖性权衡,雄性可能会从不那么有吸引力的雌性中流产后代,以节约未来怀孕的资源. 这突显了男性怀孕中的性冲突.
科学领域:
- 生殖生物学 生殖生物学
- 进化生物学是进化的生物学.
- 动物行为 动物行为
背景情况:
- 雄性怀孕在Syngnathidae (海马,管鱼,海龙) 是一个独特的适应.
- 雄性繁殖袋的进化可能涉及性冲突和生殖事件之间的权衡.
- 男性的家长照顾得到了充分的证据,但在袋子进化中冲突的作用不太清楚.
研究的目的:
- 为了研究海湾管鱼 (Syngnathus scovelli) 繁殖后的性选择.
- 检查连续的男性怀孕之间的权衡,受女性吸引力的影响.
- 为了确定性冲突是否塑造男性生殖策略在syngnathids.
主要方法:
- 对海湾管鱼 (Syngnathus scovelli) 进行了受控的繁殖实验.
- 在怀孕期间影响后代存活率的因素分析 (伴侣大小,卵子数量,雄性反应能力).
- 评估当前与之前怀孕中胚胎存活率之间的关系.
主要成果:
- 后代的生存率受到伴侣大小,卵子数量和男性性反应的影响.
- 当前怀孕中的胚胎存活率与先前怀孕中的存活率有负相关性,这表明有种子之间的权衡.
- 有证据表明,雄性参与了神秘的选择,选择性地堕胎了不那么有吸引力的雌性胚胎.
结论:
- 在海湾管道鱼中存在交配后的性选择和性冲突.
- 雄性繁殖袋的功能不仅在于培养,而且作为调解性冲突的场所.
- 男性的生殖策略涉及平衡当前的生殖投资与未来的机会,受到伴侣选择和神秘的女性选择的影响.
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