在野生哺乳动物中,早期和晚期生殖之间的特征依赖性关联
Chris McKenna-Ell1, Sanjana Ravindran1, Jill G Pilkington1
1Institute of Ecology and Evolution, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3FL, UK.
Biology letters
|July 11, 2023
概括
雌性大豆羊的早期繁殖影响了生命晚期的繁殖成功,但不是后代的生存率或体重. 这表明了老化和生命史中复杂的,特征特定的权衡.
科学领域:
- 进化生物学是进化的生物学.
- 老年学是一门学科.
- 动物行为 动物行为
背景情况:
- 生命史理论预测了早期和晚期生殖之间的权衡,影响了衰老.
- 老龄化在野生脊椎动物中很常见,但直接证据将早期晚期的权衡与老龄化率联系起来很少.
- 脊椎动物的繁殖策略是多方面的,但早期生殖投资对后期生命阶段的影响还不够研究.
研究的目的:
- 调查早期生殖分配如何影响晚期生殖表现和野生大豆羊的衰老.
- 确定早期生殖和晚年生活结果之间的关系中是否存在特征特异的差异.
- 检查早期生殖投资对后代生殖概率,后代存活率和后代出生体重的影响.
主要方法:
- 利用了野生大豆羊的36年研究的纵向数据.
- 分析了第一次生殖年龄与随后的晚年生殖表现指标之间的关系.
- 评估了特征依赖于每年繁殖概率,后代第一年生存率和后代出生体重的特征依赖性影响,考虑到选择性消失.
主要成果:
- 雌性早期繁殖与年龄的每年繁殖概率的更快下降有关,这表明了权衡.
- 在早期生殖和与年龄相关的后代第一年生存率或出生体重下降之间没有发现显著的关联.
- 在所有晚年生殖措施中观察到选择性失踪,寿命较长的个体表现出更高的平均表现.
结论:
- 这项研究为早期晚期生殖性权衡在塑造衰老中的存在提供了混合支持.
- 早年生殖对晚年生殖表现的影响是特征依赖的,在不同的生殖措施中有所不同.
- 这些发现凸显了生命历史进化的复杂性和早期投资影响衰老和生殖衰老的细微方式.
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