共同养哺乳动物的种群动态是由种群层面而不是群体层面的Allee效应驱动的
Luis A Ebensperger1, Mauricio Lima1,2, Carolina B Morales1
1Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
The Journal of animal ecology
|March 4, 2025
概括
在Octodon degus中,合作繁殖显示出人口级别的Allee效应,而不是群体级别的效应,特别是当食物稀缺时. 群体生活并不能保护这些动物免受人口减少的风险.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 动物行为 动物行为
背景情况:
- 合作繁殖物种通常在社会群体层面表现出Allee效应.
- 在多重繁殖和共同照顾后代的物种中,这种动态的理解较少.
- 这些物种在人口层面上仍然可能面临人口统计学艾利效应.
研究的目的:
- 调查社区Octodon degus. 群体和群体层面的动态.
- 确定艾利效应是否影响这些动物的种群动态.
- 评估粮食供应和群体规模与人口密度脱的作用.
主要方法:
- 对Octodon degus种群和群体动态的15年数据集的分析.
- 检查人口层面对生长率和生育率的影响.
- 评估群体层面的Allee对生育能力的影响以及群体规模与人口密度之间的关系.
- 测试Allee对食品可用性的影响.
主要成果:
- 在人口水平上观察到对人均人口增长和女性生育率的Allee效应.
- 在每组女性生育能力上没有发现群体级别的Allee效应.
- 当食物供应稀缺时,带效应更为明显.
- 发现群体规模与人口密度相结合.
结论:
- 在殖民环境中以食物为媒介的合作推动了Octodon degus.在人口层面的Allee效应.
- 群体生活并不能保护 degus 免受人口层面的 Allee 影响.
- 研究结果表明,在多种繁殖和殖民物种中,存在局部灭绝风险的机制.
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