Context Dependent Effect of Landscape on the Occurrence of an Apex Predator across Different Climate Regions
Context Dependent Effect of Landscape on the Occurrence of an Apex Predator across Different Climate Regions
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DOI：
10.1371/journal.pone.0153722
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发表时间：
2016-04-28
期刊：
影响因子：
3.7
通讯作者：
Miyashita, Tadashi
中科院分区：
文献类型：
--
作者：
Fujita, Go;Azuma, Atsuki;Miyashita, Tadashi
在景观尺度的生境适宜性研究中，不同地点之间物种-景观关联的可转移性可能是至关重要的，因为在不同地区收集数据集往往是不切实际的。然而，由于物种池的差异，诸如猎物可用性等限制因素不太可能在不同尺度上保持不变。对于经常成为保护目标的顶级掠食者来说尤其如此。本文主要研究了东亚地区以农田为主的顶级捕食者灰面秃鹰。我们利用来自五个地点的巢巢位置数据集研究了“秃鹰-景观关系”的语境依赖性，每个地点的景观组成不同。基于猎获物和景观组成的相似性，我们确定了几种不同的类群方式，并对不同类群之间的秃鹰-景观关系进行了研究。结果，基于猎物相似性的研究地点分组模型显示最小的δ AICc。由于群落IDs与阔叶林和草地面积的交互作用项的选取，秃鹰与景观的关系呈现出一种语境依赖关系，即这两种景观要素在南方地区的相互关系得到强化。猎物动物群的差异与气候的差异有关，可能会导致秃鹰与景观关联的区域差异。
In studies of habitat suitability at landscape scales, transferability of species-landscape associations among sites are likely to be critical because it is often impractical to collect datasets across various regions. However, limiting factors, such as prey availability, are not likely to be constant across scales because of the differences in species pools. This is particularly true for top predators that are often the target for conservation concern. Here we focus on gray-faced buzzards, apex predators of farmland-dominated landscapes in East Asia. We investigated context dependency of "buzzard-landscape relationship", using nest location datasets from five sites, each differing in landscape composition. Based on the similarities of prey items and landscape compositions across the sites, we determined several alternative ways of grouping the sites, and then examined whether buzzard-landscape relationship change among groups, which was conducted separately for each way of grouping. As a result, the model of study-sites grouping based on similarities in prey items showed the smallest Delta AICc. Because the terms of interaction between group IDs and areas of broad-leaved forests and grasslands were selected, buzzard-landscape relationship showed a context dependency, i. e., these two landscape elements strengthen the relationship in southern region. The difference in prey fauna, which is associated with the difference in climate, might generate regional differences in the buzzard-landscape associations.