Species extinction thresholds in the face of spatially correlated periodic disturbance.
Species extinction thresholds in the face of spatially correlated periodic disturbance.
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DOI：
10.1038/srep15455
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发表时间：
2015-10-20
影响因子：
4.6
通讯作者：
Nijs I
中科院分区：
文献类型：
--
作者：
Liao J;Ying Z;Hiebeler DE;Wang Y;Takada T;Nijs I
干扰的空间相关性越来越受到景观生态学的关注，但知识仍然缺乏空间相关的干扰制度下，物种性状如何决定灭绝阈值。在这里，我们开发了一个对近似模型，探讨在一个网格结构的景观受到聚合周期性干扰的物种灭绝风险。增加干扰的程度和频率加速种群灭绝，无论扩散是本地或全球。干扰的空间相关性也增加了物种灭绝的风险，但仅限于当地的扩散。这表明基于随机模拟扰动的模型（例如，平均场或非空间模型）可能低估了真实的灭绝率。与局部扩散相比，具有全球扩散的物种耐受更严重的干扰，这表明从进化的角度来看，干扰的空间相关性有利于远距离扩散。干扰后，种内竞争大大增加了距离有限扩散者的灭绝风险，但令人惊讶的是，除了在一定程度上降低种群密度外，种内竞争并没有影响全球扩散者的灭绝阈值。由于物种对具有不同时空特性的扰动制度的反应不同，不同的制度可能适应不同的物种。
The spatial correlation of disturbance is gaining attention in landscape ecology, but knowledge is still lacking on how species traits determine extinction thresholds under spatially correlated disturbance regimes. Here we develop a pair approximation model to explore species extinction risk in a lattice-structured landscape subject to aggregated periodic disturbance. Increasing disturbance extent and frequency accelerated population extinction irrespective of whether dispersal was local or global. Spatial correlation of disturbance likewise increased species extinction risk, but only for local dispersers. This indicates that models based on randomly simulated disturbances (e.g., mean-field or non-spatial models) may underestimate real extinction rates. Compared to local dispersal, species with global dispersal tolerated more severe disturbance, suggesting that the spatial correlation of disturbance favors long-range dispersal from an evolutionary perspective. Following disturbance, intraspecific competition greatly enhanced the extinction risk of distance-limited dispersers, while it surprisingly did not influence the extinction thresholds of global dispersers, apart from decreasing population density to some degree. As species respond differently to disturbance regimes with different spatiotemporal properties, different regimes may accommodate different species.