种群同步性的空间尺度一般随着波动在两种群生态系统中的传播而增大
Spatial Scales of Population Synchrony generally increases as fluctuations propagate in a Two Species Ecosystem
摘要：
种群同步的空间尺度给出了种群波动相关的特征距离。因此，它也给出了同时发生人口减少甚至灭绝的区域的特征大小。单种以前的结果意味着，人口同步的空间尺度是等于或大于（由于分散）比环境波动的同步的空间尺度。多物种生态系统的理论结果指出，物种间的相互作用改变了种群同步的空间尺度。特别是，最近的结果对两个物种的生态系统，两个竞争对手和捕食者-猎物，点的空间尺度的人口同步性一般增加的波动传播通过食物网〈动〉<动>，即，受环境波动影响越直接的物种，其种群同步性的空间尺度越小。在这里，我们发现这种行为对于两个物种的生态系统通常是正确的。这种行为的例外是某些特殊情况，其中一个物种的种群波动本身并不衰减，而是需要将波动强烈地传递到另一个物种才能衰减。这些分析结果说明了在开发可持续收获或评估濒危物种灭绝风险时，应用生态系统而不是单一物种视角的重要性。
英文摘要：
The spatial scale of population synchrony gives the characteristic distance at which the population fluctuations are correlated. Therefore, it gives also the characteristic size of the regions of simultaneous population depletion, or even extinction. Single-species previous results imply that the spatial scale of population synchrony is equal or greater (due to dispersion) than the spatial scale of synchrony of environmental fluctuations. Theoretical results on multispecies ecosystems points that interspecies interactions modify the spatial scale of population synchrony. In particular, recent results on two species ecosystems, for two competitors and for predator-prey, point that the spatial scale of population synchrony generally increases as the fluctuations propagates through the food web, i.e., the species more directly affected by environmental fluctuations presents the smaller spatial scale of population synchrony. Here, we found that this behaviour is generally true for a two species ecosystem. The exception to this behaviour are the particular cases where the population fluctuations of one of the species does not damp by its own, but requires a strong transfer of the fluctuation to the other species to be damped. These analytical results illustrate the importance of applying an ecosystem rather than a single-species perspective when developing sustainable harvestings or assessing the extinction risk of endangered species.
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