Spatial distribution in Norwegian lemming Lemmus lemmus in relation to the phase of the cycle
Spatial distribution in Norwegian lemming Lemmus lemmus in relation to the phase of the cycle
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DOI：
10.1007/s00300-018-2293-6
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发表时间：
2018-03
期刊：
影响因子：
1.7
通讯作者：
Maryline Le Vaillant;R. Erlandsson;B. Elmhagen;B. Hörnfeldt;N. Eide;A. Angerbjörn
中科院分区：
文献类型：
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作者：
Maryline Le Vaillant;R. Erlandsson;B. Elmhagen;B. Hörnfeldt;N. Eide;A. Angerbjörn
同一物种或不同物种的个体之间的竞争在任何给定时间都会影响生物体的空间分布。因此，一个物种的地理分布是通过密度依赖的过程与人口动态。小型北极啮齿动物是许多北极生态系统的重要猎物。它们通常表现出大的周期性波动丰富提供了一个潜在的调查景观特征与密度依赖的栖息地选择。基于长期的夏季诱捕数据的挪威旅鼠（Lemmus lemmus）在斯堪的纳维亚山区苔原，我们应用物种分布模型来测试，如果环境变量对旅鼠分布的影响改变有关的旅鼠周期。旅鼠在高峰期的栖息地特异性较低，因为它们的分布只与初级生产力有关。然而，在增加阶段，旅鼠分布，此外，与景观特征，如丘陵地形和斜坡，不太可能被淹没。旅鼠栖息地的使用在周期中变化，表明密度依赖的变化，可以解释种内竞争的栖息地选择。我们认为，在增加阶段观察到的分布模式显示出更强的生态信号的栖息地偏好和特定的栖息地使用在高峰期是旅鼠放牧自己的最佳栖息地的人口增长的结果。旅鼠冬季分布的未来研究将有可能调查周围的旅鼠栖息地选择策略的一年，更好地了解在许多北极生态系统中的一个基本演员。
Competition between individuals of the same or different species affects spatial distribution of organisms at any given time. Consequently, a species geographical distribution is related to population dynamics through density-dependent processes. Small Arctic rodents are important prey species in many Arctic ecosystems. They commonly show large cyclic fluctuations in abundance offering a potential to investigate how landscape characteristics relates to density-dependent habitat selection. Based on long-term summer trapping data of the Norwegian lemming (Lemmus lemmus) in the Scandinavian Mountain tundra, we applied species distribution modeling to test if the effect of environmental variables on lemming distribution changed in relation to the lemming cycle. Lemmings were less habitat specific during the peak phase, as their distribution was only related to primary productivity. During the increase phase, however, lemming distribution was, in addition, associated with landscape characteristics such as hilly terrain and slopes that are less likely to get flooded. Lemming habitat use varied during the cycle, suggesting density-dependent changes in habitat selection that could be explained by intraspecific competition. We believe that the distribution patterns observed during the increase phase show a stronger ecological signal for habitat preference and that the less specific habitat use during the peak phase is a result of lemmings grazing themselves out of the best habitat as the population grows. Future research on lemming winter distribution would make it possible to investigate the year around strategies of habitat selection in lemmings and a better understanding of a fundamental actor in many Arctic ecosystems.