生命史的权衡和环境的变化影响了山地类动物的繁殖人口结构
Kevin S White1,2,3, Taal Levi4, Eran Hood2
1Department of Geography, University of Victoria, Victoria, British Columbia, Canada.
The Journal of animal ecology
|September 12, 2025
概括
山羊的繁殖受到繁殖成本和环境因素 (如积雪) 的重大影响. 这些高山动物优先考虑生存,在应对气候变化时表现出保守的繁殖策略.
科学领域:
- 生态生态学 生态生态学
- 野生动物生物学 野生动物生物学
- 人口统计学 人口统计学
背景情况:
- 阿尔卑斯山的生态系统面临着快速的环境变化.
- 山地山羊 (Oreamnos americanus) 是山地生态系统健康的关键指标.
- 了解生殖人口结构对于管理野生动物种群至关重要.
研究的目的:
- 调查山羊繁殖人口结构的内在和外在驱动因素.
- 分析生命历史的权衡和环境变化的生殖影响.
- 评估气候敏感因素对人口动态的影响.
主要方法:
- 利用了阿拉斯加沿海地区17年来个别标记的山羊 (n=180只雌性) 的长期数据.
- 研究了不同年龄段 (年轻人,成年人,老年人) 的生殖成本.
- 使用人口模型评估冬季积雪和前期夏季温度对生殖成功的影响.
主要成果:
- 观察到高生殖成本,特别是在年轻和老年雌性身上.
- 冬季积雪的积累大大降低了生殖率 (20%-35%).
- 之前的夏季温度对生殖有较弱的负面影响 (10%-15%).
- 积雪对人口增长的影响比夏季的温度更大,因为年间的变化更大.
- 生殖能力没有对母亲或后代的后续存活产生负面影响.
结论:
- 山地山羊表现出"风险敏感"的繁殖策略,优先考虑生存.
- 生命历史的权衡和环境的变化,特别是雪,是山羊繁殖人口结构的关键驱动因素.
- 研究结果提供了对高山环境中气候敏感野生动物的繁殖策略的见解.
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