The wolves of Isle Royale display scale-invariant satiation and ratio-dependent predation on moose
The wolves of Isle Royale display scale-invariant satiation and ratio-dependent predation on moose
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DOI：
10.1111/j.1365-2656.2005.00977.x
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发表时间：
2005-09-01
影响因子：
4.8
通讯作者：
Arditi, R
中科院分区：
文献类型：
--
作者：
Jost, C;Devulder, G;Arditi, R
1.本文研究了在美国密歇根州皇家岛国家公园的麋鹿-驼鹿相互作用中捕食者功能反应的两个特征（饱足和捕食者依赖）的重要性。这是通过拟合和比较九种不同的功能反应模型与观察到的杀灭率来完成的。三种不同的观测尺度（整个岛屿，狼群，或一个“混合”的规模）被用来评估检测到的属性相对于这些空间尺度的敏感性。独立的观测尺度和数据结构的统计假设，强大的捕食者的依赖性和饱食狼的功能response. The“混合”规模给出了最一致的结果，这表明捕食应测量每个包，但包共享所有驼鹿在岛上。在这个尺度上，功能反应明显是比率依赖性的。
1. The importance of two features of the predator functional response (satiation and predator dependence) is investigated in the wolf-moose interaction on Isle Royale National Park (Michigan, USA). This is done by fitting and comparing nine different functional response models to the observed kill rates.2. Three different observational scales (the whole island, the wolf packs, or a 'mixed' scale) are used to assess the sensitivity of the detected properties with respect to these spatial scales.3. Independently of the observational scale and of statistical assumptions on data structure, strong predator dependence and satiation of the wolf functional response are found. The 'mixed' scale gives the most consistent results, suggesting that predation should be measured for each pack, but that packs share all moose on the island. On this scale, the functional response is clearly ratio-dependent.