Energy pathways modulate the resilience of stream invertebrate communities to drought
Energy pathways modulate the resilience of stream invertebrate communities to drought
复制标题
能量途径调节溪流无脊椎动物群落对干旱的恢复能力
DOI：
10.1111/1365-2656.13490
复制
发表时间：
2021
影响因子：
4.8
通讯作者：
Allen, Daniel C.
中科院分区：
文献类型：
--
作者：
Nelson, Daniel;Busch, Michelle H.;Kopp, Darin A.;Allen, Daniel C.
虽然气候变化正在全球范围内改变生态系统，但并非所有生态系统都以同样的方式作出反应。生态群落的恢复力可能取决于食物网是以生产者为基础还是以碎屑为基础（即分别为“绿色”或“棕色”食物网），或者两者兼而有之（即“多渠道”食物网）。食物网理论表明，多种能量途径的存在可以增强群落的稳定性和恢复力，并可能调节生态群落对气候变化等干扰的反应。尽管食物网理论取得了重要进展，但很少有研究对不同初级能量通道生态系统中生态群落对气候变化压力源的适应能力进行实证研究。利用室外河流生态系统进行因子试验，研究了不同能量通道配置下，气候变暖和干旱对食物网中无脊椎动物群落的独立和交互影响。气候变暖对无脊椎动物的影响不大，但河流干燥对无脊椎动物的总体丰度、生物量、丰富度和多样性均有负面影响。尽管不同能量通道处理对干燥的抗性没有差异，但绿色中胚层的恢复力和总体恢复力高于混合和棕色中胚层。不同的类群对干燥的适应能力差异也很大，较大的掠食性类群表现出较低的适应能力。我们的研究结果表明，干旱对河流群落的影响可能因地区而异，并取决于食物网是由本地还是外来的基础资源提供燃料。居住在具有大量有机物和更复杂基质的溪流中的群落可能比居住在具有更简单、更均匀基质的溪流中的群落更能适应地表水的流失。
While climate change is altering ecosystems on a global scale, not all ecosystems are responding in the same way. The resilience of ecological communities may depend on whether food webs are producer‐ or detritus‐based (i.e. ‘green’ or ‘brown’ food webs, respectively), or both (i.e. ‘multi‐channel’ food web).Food web theory suggests that the presence of multiple energy pathways can enhance community stability and resilience and may modulate the responses of ecological communities to disturbances such as climate change. Despite important advances in food web theory, few studies have empirically investigated the resilience of ecological communities to climate change stressors in ecosystems with different primary energy channels.We conducted a factorial experiment using outdoor stream mesocosms to investigate the independent and interactive effects of warming and drought on invertebrate communities in food webs with different energy channel configurations. Warming had little effect on invertebrates, but stream drying negatively impacted total invertebrate abundance, biomass, richness and diversity.Although resistance to drying did not differ among energy channel treatments, recovery and overall resilience were higher in green mesocosms than in mixed and brown mesocosms. Resilience to drying also varied widely among taxa, with larger predatory taxa exhibiting lower resilience.Our results suggest that the effects of drought on stream communities may vary regionally and depend on whether food webs are fuelled by autochthonous or allochthonous basal resources. Communities inhabiting streams with large amounts of organic matter and more complex substrates that provide refugia may be more resilient to the loss of surface water than communities inhabiting streams with simpler, more homogeneous substrates.