生态系统的稳定性取决于食物层之间的多样性差异
Yizhou Liu1,2, Jiliang Hu1, Jeff Gore1
1Physics of Living Systems, Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139.
概括
生态社区的稳定性取决于食物层之间的多样性差异,而不是绝对的物种数量. 类似的多样性水平会造成不稳定,而差异会增强生态系统的弹性.
科学领域:
- 生态生态学 生态生态学
- 理论生态学理论生态学
- 社区生态学社区生态学
背景情况:
- 生物多样性与生态系统稳定性之间的关系是生态学中一个核心的,有争议的话题.
- 之前的研究已经产生了相互矛盾的结果,即更高的生物多样性是否增强或减少稳定性.
- 人类的福祉直接与通过服务和健康的生态系统稳定性有关.
研究的目的:
- 为了研究在确定生态社区的稳定性中食量级之间的多样性差异的作用.
- 解决关于生物多样性与稳定关系的相互矛盾理论.
- 根据跨层次的多样性,制定一个定量稳定性标准.
主要方法:
- 对具有多种捕食者和猎物物种的最小两级生态系统模型的分析.
- 分析稳定性标准的推导.
- 将模型扩展到三个营养水平和其他相互作用类型 (例如交叉养).
主要成果:
- 社区的稳定性取决于食物层之间的多样性差异,而不是绝对的多样性.
- 一个层面的多样性越来越多,显示出一个重新进入的过渡:最初的不稳定,然后是稳定.
- 最不稳定的社区在不同的热带层表现出相似的多样性水平.
- 衍生的稳定性标准量化了层次间相互作用相关性的影响.
结论:
- 营养水平的结构和多样性差异对于生态系统的稳定性至关重要.
- 稳定性对多样性的非单调依赖解释了各种经验观察.
- 这些发现为预测生态系统行为和稳定性提供了一个新的框架.
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