Ecological responses to experimental glacier-runoff reduction in alpine rivers.
Ecological responses to experimental glacier-runoff reduction in alpine rivers.
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DOI：
10.1038/ncomms12025
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发表时间：
2016-06-24
影响因子：
16.6
通讯作者：
Dangles O
中科院分区：
文献类型：
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作者：
Cauvy-Fraunié S;Andino P;Espinosa R;Calvez R;Jacobsen D;Dangles O
冰川退缩是一种世界性现象，对水文循环和下游生态系统的结构和功能具有重要影响。为了确定冰川退缩对水生群落的影响，我们在一条热带冰川补给的溪流中进行了为期4年的水流控制。与邻近的参考溪流相比，融水流量减少会在不到2周的时间内引起底栖动物群落组成的显著变化。此外，作为对流量减少的反应，操控溪流中藻类和草食动物的生物量都显著增加。在流量减少停止后，系统需要14-16个月才能恢复到扰动前的状态。这些结果得到了对不同冰川影响的地点的多溪流调查的支持，调查显示，在集水区的冰川覆盖率低于11%的情况下，藻类和食草动物的生物量突然增加。这项研究表明，流量减少对冰川补给的河流生物群产生了强烈的影响，预示着正在进行的冰川消退对水生系统的深远生态影响。气候变化导致的冰川退缩会影响生物多样性和生态系统功能。在这里，Cauvy-Fraunié和他的同事操纵了厄瓜多尔安第斯山脉热带冰川供应的溪流的流动，并表明底栖动物群落的组成需要几个月的时间才能恢复到封锁前的条件。
Glacier retreat is a worldwide phenomenon with important consequences for the hydrological cycle and downstream ecosystem structure and functioning. To determine the effects of glacier retreat on aquatic communities, we conducted a 4-year flow manipulation in a tropical glacier-fed stream. Compared with an adjacent reference stream, meltwater flow reduction induces significant changes in benthic fauna community composition in less than 2 weeks. Also, both algal and herbivore biomass significantly increase in the manipulated stream as a response to flow reduction. After the flow reduction ceased, the system requires 14–16 months to return to its pre-perturbation state. These results are supported by a multi-stream survey of sites varying in glacial influence, showing an abrupt increase in algal and herbivore biomass below 11% glacier cover in the catchment. This study shows that flow reduction strongly affects glacier-fed stream biota, prefiguring profound ecological effects of ongoing glacier retreat on aquatic systems. Glacier retreat due to climate change can affect the biodiversity and ecosystem function. Here, Cauvy-Fraunié and colleagues manipulated the flow of tropical glacier-fed stream in the Ecuadorian Andes, and show that benthic fauna community composition requires several months before it can recover to the pre-blockade conditions.