阶段锁定和环境波动在捕食者-猎物社区中产生同步
David A Vasseur1, Jeremy W Fox
1Department of Ecology and Evolutionary Biology, Yale University, New Haven, Connecticut 06520, USA. david.vasseur@yale.edu
Nature
|July 24, 2009
概括
物种种群中的空间同步受分散,环境因素 (莫兰效应) 和捕食者与猎物的相互作用的影响. 捕食者驱动的循环是分散以同步种群的关键,增强生态稳定性.
科学领域:
- 生态生态学 生态生态学
- 人口动态 人口动态
- 理论生物学 理论生物学
背景情况:
- 空间同步在自然系统中很常见,但引起它的因素的相互作用是复杂的.
- 了解同步驱动因素对于预测人口稳定性和生态动态至关重要.
- 之前的研究经常孤立地研究同步因素,限制了对它们相互作用的理解.
研究的目的:
- 开发一个一般的捕食者-猎物空间动态的随机模型.
- 测试分散的相互作用,莫兰效应,以及空间同步上的跨种相互作用.
- 为了预测这些相互作用的结果在实验室的微观宇宙实验.
主要方法:
- 开发了捕食者-猎物空间动态的一般随机模型.
- 进行了一项实验室微观宇宙实验,使用状原体 (Tetrahymena pyriformis) 和它们的捕食者 (Euplotes patella).
- 量化了分散,莫兰效应和掠食者存在对人口同步的影响.
主要成果:
- 仅仅莫兰效应就同步了猎物种群.
- 只有当捕食者存在时,分散才能使猎物种群同步,这表明对捕食者诱导的循环动态的依赖.
- 分散"相锁"捕食者-猎物周期,防止脱节和保持同步;如果没有周期,这种效果是可以忽略不计的.
- 跨物种相互作用通过改变种群动态来增强同步性,而不是通过添加单独的波动源来增加.
结论:
- 捕食者驱动的循环动态对于分散至关重要,以有效地同步种群.
- 跨物种相互作用在调节分散对空间同步的影响方面发挥着关键作用.
- 这些发现为了解各种生态系统中的空间同步提供了一个强大的框架,包括捕食者-猎物和宿主-病原体动态.
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