Bird species turnover is related to changing predation risk along a vegetation gradient
Bird species turnover is related to changing predation risk along a vegetation gradient
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鸟类物种更替与沿植被梯度变化的捕食风险有关
DOI：
10.1890/14-1333.1
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发表时间：
2015
期刊：
影响因子：
4.8
通讯作者：
T. E. Martin
中科院分区：
文献类型：
--
作者：
Joseph A LaManna;Amy B. Hemenway;Vanna J. Boccadori;T. E. Martin
周转在动物物种沿着植被梯度往往被认为是反映适应性栖息地的偏好，比全梯度窄。具体来说，动物在繁殖成功率低的地方数量可能会减少，而这些低质量的地点在物种之间是不同的。然而，栖息地的利用并不总是适应性的。缺乏关于动物的丰度和人口成本如何沿着实验操纵的植被梯度沿着变化的关键测试。我们研究了16种鸟类的栖息地利用和巢捕食率，表现出营业额与落叶和针叶植被的变化。对于大多数鸟类物种，减少丰度与增加捕食率沿着自然和实验修改植被梯度。这种规模的方法强烈支持的想法，植被介导的捕食作用与动物的分布和物种营业额。
Turnover in animal species along vegetation gradients is often assumed to reflect adaptive habitat preferences that are narrower than the full gradient. Specifically, animals may decline in abundance where their reproductive success is low, and these poor-quality locations differ among species. Yet habitat use does not always appear adaptive. The crucial tests of how abundances and demographic costs of animals vary along experimentally manipulated vegetation gradients are lacking. We examined habitat use and nest predation rates for 16 bird species that exhibited turnover with shifts in deciduous and coniferous vegetation. For most bird species, decreasing abundance was associated with increasing predation rates along both natural and experimentally modified vegetation gradients. This landscape-scale approach strongly supports the idea that vegetation-mediated effects of predation are associated with animal distributions and species turnover.