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The role of habitat disturbance and recovery in metapopulation persistence.

机译:栖息地干扰和恢复在持久种群迁移中的作用。

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摘要

Classical metapopulation theory assumes a static landscape. However, empirical evidence indicates many metapopulations are driven by habitat succession and disturbance. We develop a stochastic metapopulation model, incorporating habitat disturbance and recovery, coupled with patch colonization and extinction, to investigate the effect of habitat dynamics on persistence. We discover that habitat dynamics play a fundamental role in metapopulation dynamics. The mean number of suitable habitat patches is not adequate for characterizing the dynamics of the metapopulation. For a fixed mean number of suitable patches, we discover that the details of how disturbance affects patches and how patches recover influences metapopulation dynamics in a fundamental way. Moreover, metapopulation persistence is dependent not only on the average lifetime of a patch, but also on the variance in patch lifetime and the synchrony in patch dynamics that results from disturbance. Finally, there is an interaction between the habitat and metapopulation dynamics, for instance declining metapopulations react differently to habitat dynamics than expanding metapopulations. We close, emphasizing the importance of using performance measures appropriate to stochastic systems when evaluating their behavior, such as the probability distribution of the state of the metapopulation, conditional on it being extant (i.e., the quasistationary distribution).
机译:古典的人口迁移理论假设一个静态景观。但是,经验证据表明,许多种群是由生境演替和干扰驱动的。我们建立了一个随机的种群模型,结合了栖息地的干扰和恢复,以及斑块的定植和灭绝,以研究栖息地动态对持久性的影响。我们发现栖息地动力学在种群动态中起着基本作用。合适的栖息地斑块的平均数量不足以表征种群的动态。对于固定数量的合适补丁,我们发现扰动如何影响补丁以及补丁如何恢复的细节从根本上影响了种群动态。而且,种群持久性不仅取决于斑块的平均寿命,还取决于斑块寿命的变化和由干扰引起的斑块动力学的同步性。最后,栖息地与种群动态之间存在相互作用,例如,减少的种群对栖息地动态的反应与扩展的种群不同。我们在结语时强调了在评估随机系统的行为时使用适合于随机系统的性能度量的重要性,例如以随机种群为前提的准种群状态(即准稳态分布)的概率分布。

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