母亲效应衰老和热量限制相互作用,通过生活史的变化影响健康时间
Christina M Hernández1, Silke F van Daalen2, Alyssa Liguori3
1Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA.
The Journal of animal ecology
|November 26, 2024
概括
低粮食条件在罗提弗延迟繁殖和延长寿命,但减少人口增长. 孕产妇的年龄和食物的可用性相互作用,影响人口结构和健康状况,突出了生命周期分析的必要性.
科学领域:
- 生态学和进化生物学.
- 人口动态 人口动态
- 生命史理论 生命史理论
背景情况:
- 环境因素和个体属性相互作用,影响生存,生长和繁殖.
- 克隆式的 rotifer Brachionus 在缺乏食物的条件下表现出延迟的繁殖和延长寿命.
- 母亲效应衰老发生,年长母亲的后代减少了生存和生殖产出.
研究的目的:
- 探索母亲年龄和低粮食可用性之间的相互作用对人口的影响.
- 调查这些因素如何影响人口增长率和结构.
- 在不同情景下分析生育率和生存率变化的人口贡献.
主要方法:
- 为自由选择和低食物治疗构建矩阵人口模型,按年龄和孕产妇年龄分类个体.
- 对降低生育率或生存率的假设场景进行分析,以模拟静止种群.
- 生活表响应实验 (LTRE) 分析以在不同条件和场景下比较人口统计率.
主要成果:
- 低粮食条件降低了人口增长率,并将人口结构转向更老的孕产妇年龄.
- 个人一生的生殖产出没有受到低食物的可检测影响.
- 在实验室条件下,低食物下人口增长的减少主要是由于早期生育率的下降.
结论:
- 个人好处,如在低食物下延长寿命,可能会由于延迟繁殖而降低人口健康.
- 孕产妇年龄和食物供应的相互作用取决于人口结构,影响健康后果.
- 综合性生命周期分析对于了解环境变化的适应性影响至关重要.
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