Predicted climate change alters the indirect effect of predators on an ecosystem process
Predicted climate change alters the indirect effect of predators on an ecosystem process
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DOI：
10.1073/pnas.0607064103
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发表时间：
2006-10-17
影响因子：
11.1
通讯作者：
Wise, David H.
中科院分区：
文献类型：
--
作者：
Lensing, Janet R.;Wise, David H.
预计随着全球气候变化而发生的降雨量变化可能会通过对初级分解者的直接影响来改变落叶分解的速度。在两个地点重复的现场实验中，我们表明，降雨量的改变也可能会改变落叶中节肢动物捕食者引发的级联营养相互作用间接影响凋落物分解的方式。在干燥地区，降雨与捕食者对分解的间接影响之间没有相互作用。相比之下，在潮湿的地方，蜘蛛在低降雨量下加速了落叶凋落物的消失速度，但在高降雨量下没有或可能产生负面的间接影响。因此，随着气候变化而发生的更强烈的水文循环所引起的变化可能会影响捕食者如何间接影响重要的生态系统过程。
Changes in rainfall predicted to occur with global climate change will likely alter rates of leaf-litter decomposition through direct effects on primary decomposers. In a field experiment replicated at two sites, we show that altered rainfall may also change how cascading trophic interactions initiated by arthropod predators in the leaf litter indirectly influence litter decomposition. On the drier site there was no interaction between rainfall and the indirect effect of predators on decomposition. In contrast, on the moister site spiders accelerated the disappearance rate of deciduous leaf litter under low rainfall, but had no, or possibly a negative, indirect effect under high rainfall. Thus, changes resulting from the more intense hydrological cycle expected to occur with climate change will likely influence how predators indirectly affect an essential ecosystem process.