Splitting the tail of the displacement kernel shows the unimportance of kurtosis
Splitting the tail of the displacement kernel shows the unimportance of kurtosis
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DOI：
10.1890/07-1363.1
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发表时间：
2008-07-01
期刊：
影响因子：
4.8
通讯作者：
Wennergren, Uno
中科院分区：
文献类型：
--
作者：
Lindstroem, Tom;Hakansson, Nina;Wennergren, Uno
动物通过不同的运动行为在空间中分散，产生不同的位移距离。这通常用位移内核来描述，其中长距离分散器位于内核的尾部内。大量长距离分散者的迁移可能会对空间生态学的不同方面产生影响，例如入侵速度、种群持续性和分布。然而，尚不清楚核的峰度是否起着主要作用，因为较胖的尾部也会影响核的方差。我们对具有不同数量和栖息地配置的景观中的位移进行建模，并分别处理峰度和方差，以研究它们如何影响种群分布和过渡时间。我们得出的结论是，峰度对于空间生态学的任何这些方面都不重要。另一方面，核的方差对于种群分布和过渡时间都非常重要。我们认为，分离方差和峰度可以为长距离分散器在生态过程中的重要性提供新的线索。讨论了实证研究的后果。
Animals disperse in space through different movement behaviors, resulting in different displacement distances. This is often described with a displacement kernel where the long-distance dispersers are within the tail of the kernel. A displacement with a large proportion of long-distance dispersers may have impact on different aspects of spatial ecology such as invasion speed, population persistence, and distribution. It is, however, unclear whether the kurtosis of the kernel plays a major role since a fatter tail also influences the variance of the kernel. We modeled displacement in landscapes with different amounts and configurations of habitats and handled kurtosis and variance separately to study how these affected population distribution and transition time. We conclude that kurtosis is not important for any of these aspects of spatial ecology. The variance of the kernel, on the other hand, was of great importance to both population distribution and transition time. We argue that separating variance and kurtosis can cast new light on the way in which long-distance dispersers are important in ecological processes. Consequences for empirical studies are discussed.