内生繁殖和高养殖温度对战略精子投资的影响
Meng-Han Joseph Chung1, Md Mahmud-Al-Hasan1, Michael D Jennions1,2
1Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, Australian Capital Territory 2601, Australia.
概括
在遇到无血缘关系的健康雌性时,养的雄性皮会在战略上增加精子数量. 这种精子原始反应受到男性近亲繁殖的影响,而不是温度或女性亲属关系.
科学领域:
- 生殖生物学 生殖生物学
- 行为生态学 行为生态学
- 进化遗传学的进化遗传学
背景情况:
- 男性的精子原始化反应取决于背景,但受到环境和遗传因素的影响.
- 在孤立的淡水息地内,近亲繁殖和高温会对鱼类发育和精子生产产生负面影响.
- 瓜皮 (Poecilia reticulata) 被用来研究内生和温度对生殖策略的影响.
研究的目的:
- 为了研究发育温度和雄性近亲繁殖状态如何影响毛皮犬的精子原始化反应.
- 为了确定雌性亲属关系和内生关系是否会影响雄性熊猫的精子原始反应.
- 了解基于女性状况和亲属关系的射精的战略分配.
主要方法:
- 瓜皮犬在两个温度 (26°C和30°C) 中养.
- 男人被分为内生或外生.
- 精子计数是根据女性的存在,亲属关系和近亲繁殖状况来衡量的.
主要成果:
- 发育温度没有影响精子数;男性内生状态是唯一的决定因素.
- 当接触到与其无关的异种雌性时,同系雄性增加了精子数量,但异种雄性没有改变精子数量.
- 只有在与无关的雌性交配时,才观察到精子原始化,这表明资源分配给更健康的雌性.
结论:
- 雄性近亲繁殖状态,而不是发育温度,决定了毛皮犬的精子原始反应.
- 杂交的雄性表现出战略性的精子分配,偏爱与其无关的,杂交的 (较大的) 雌性.
- 这项研究强调了在塑造男性生殖投资方面,遗传地位和社会背景之间的相互作用.
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