论文标题
人口同步的空间尺度通常会随着两个物种生态系统的传播而增加
Spatial Scales of Population Synchrony generally increases as fluctuations propagate in a Two Species Ecosystem
论文作者
论文摘要
人口同步的空间尺度给出了人口波动相关的特征距离。因此，它还给出了同时种群耗竭甚至灭绝区域的特征大小。单物种先前的结果表明，人口同步的空间尺度比环境波动同步的空间尺度相等或更大（由于分散）。多物种生态系统的理论结果指出，种间相互作用会改变人口同步的空间尺度。特别是，针对两个竞争对手和捕食者捕集的两个物种生态系统的最新结果表明，人口同步的空间尺度通常会随着食物网的波动传播而增长，即受环境波动更直接影响的物种，表现出较小的人群同步的较小空间尺度。在这里，我们发现这种行为对于两个物种生态系统通常是正确的。这种行为的例外是特定情况下，其中一个物种的种群波动不会自行降低，而是需要将波动的强烈转移向其他物种被抑制。这些分析结果说明了在开发可持续收获或评估濒危物种的灭绝风险时，应用生态系统而不是单物种观点的重要性。
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.
