Alterations to hydrological regime of running waters are one of the typical manifestations of current climate change. Small streams in particular are subject to both periods of critically low flow rates on the one hand and increased discharges at spates on the other. The response of macroinvertebrate assemblages to flow pulses following severe rainfall events was studied in two small highland streams. Benthic macroinvertebrates showed good resistance and resilience against the impacts of increased discharge rates caused by severe rainfall events not exceeding certain limits. No distinct changes were recorded in macroinvertebrate composition following discharge events in which current velocities increased by < 0.35 m.s; however, significant (p < 0.05) reductions in abundance was recorded following the spate where current velocity increased by > 1 m.s. Macroinvertebrate assemblages on gravel substrates were more resistant to the impact of sudden flow pulses than those on sandy substrates.

中文翻译：

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水源大型无脊椎动物对水流脉冲的抵抗力

流域水文情势的改变是当前气候变化的典型表现之一。尤其是小溪流，一方面会受到流速极低的时期的影响，另一方面会遭受大量流量增加的影响。在两条小型高地溪流中研究了大型无脊椎动物群落对强降雨事件后水流脉冲的响应。底栖大型无脊椎动物对不超过一定限度的强降雨事件引起的排放量增加的影响表现出良好的抵抗力和恢复力。在电流速度增加 < 0.35 ms 的放电事件后，大型无脊椎动物的组成没有记录到明显的变化；然而，在水流速度增加> 1 ms的大量事件之后，记录到丰度显着减少（p < 0.05）。砾石基质上的大型无脊椎动物组合比沙质基质上的大型无脊椎动物组合更能抵抗突然流动脉冲的影响。