Gouhier Tarik C, Guichard Frédéric
Department of Biology, McGill University, 1205 Doctor Penfield, Montréal, Quebec H3A 1B1, Canada.
Ecology. 2007 Mar;88(3):647-57. doi: 10.1890/06-0672.
In marine systems, the occurrence and implications of disturbance-recovery cycles have been revealed at the landscape level, but only in demographically open or closed systems where landscape-level dynamics are assumed to have no feedback effect on regional dynamics. We present a mussel metapopulation model to elucidate the role of landscape-level disturbance cycles for regional response of mussel populations to onshore productivity and larval transport. Landscape dynamics are generated through spatially explicit rules, and each landscape is connected to its neighbor through unidirectional larval dispersal. The role of landscape disturbance cycles in the regional system behavior is elucidated (1) in demographically open vs. demographically coupled systems, in relation to (2) onshore reproductive output and (3) the temporal scale of landscape disturbance dynamics. By controlling for spatial structure at the landscape and metapopulation levels, we first demonstrate the interaction between landscape and oceanographic connectivity. The temporal scale of disturbance cycles, as controlled by mussel colonization rate, plays a critical role in the regional behavior of the system. Indeed, fast disturbance cycles are responsible for regional synchrony in relation to onshore reproductive output. Slow disturbance cycles, however, lead to increased robustness to changes in productivity and to demographic coupling. These testable predictions indicate that the occurrence and temporal scale of local disturbance-recovery dynamics can drive large-scale variability in demographically open systems, and the response of metapopulations to changes in nearshore productivity.
在海洋系统中，干扰 - 恢复周期的发生及其影响已在景观层面得到揭示，但仅在人口统计学上开放或封闭的系统中，其中假定景观层面的动态对区域动态没有反馈作用。我们提出了一个贻贝集合种群模型，以阐明景观层面干扰周期对贻贝种群对陆上生产力和幼体运输的区域响应的作用。景观动态通过空间明确的规则生成，并且每个景观通过单向幼体扩散与其邻居相连。在（1）人口统计学上开放与人口统计学上耦合的系统中，相对于（2）陆上繁殖输出和（3）景观干扰动态的时间尺度，阐明了景观干扰周期在区域系统行为中的作用。通过控制景观和集合种群层面的空间结构，我们首先证明了景观与海洋学连通性之间的相互作用。由贻贝定殖率控制的干扰周期的时间尺度在系统的区域行为中起着关键作用。实际上，快速干扰周期导致与陆上繁殖输出相关的区域同步。然而，缓慢的干扰周期导致对生产力变化和人口统计学耦合的稳健性增加。这些可检验的预测表明，局部干扰 - 恢复动态的发生和时间尺度可以驱动人口统计学上开放系统中的大规模变异性，以及集合种群对近岸生产力变化的响应。
