Humans affect ecosystems in many ways, and scientific field studies are no exception. If data collection disrupts environments or biota too much, it can lead to inaccurate conclusions in the study of interest or in subsequent studies. We evaluated whether stream electrofishing surveys could measurably disturb the benthic biofilms in two forested headwaters in western Oregon, USA. While the consequences of electrofishing to macroinvertebrates and fish have been assessed, to date no studies have quantified its influence on benthic biofilms. We observed declines in the standing stocks of accrued benthic chlorophyll a directly after electrofishing in both streams. After electrofishing, the standing biofilm stocks declined by an average of ~15% in Oak Creek, a small third‐order stream in the Oregon Coast Range Mountains, and by an average of ~34% in a third‐order section of Lookout Creek, which is located in the western Cascade Mountains of Oregon, USA. In returning to Oak Creek 2 weeks after electrofishing, the standing stocks had fully recovered to their prefishing levels. While the benthic biofilm standing stocks did decline in association with electrofishing, the effects were small when compared with those of disturbances from common flow events and when scaling to the whole stream system. In Oak Creek, the proportional biofilm standing stock decline from electrofishing activity was about 26% of what was observed following a moderate flow event (40% of bank‐full discharge), and about 15% of the decline in biofilm standing stocks following a complete bank‐full discharge event (140% of bank‐full discharge).

中文翻译：

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电钓鱼活动会破坏流式生物膜常备种群吗？来自俄勒冈州西部的两条源头水流的评估

人类以多种方式影响生态系统，科学领域的研究也不例外。如果数据收集过多地破坏了环境或生物区系，则可能导致在感兴趣的研究或后续研究中得出不正确的结论。我们评估了水流电捕鱼法是否能在美国西部俄勒冈州的两个森林上游水域中显着地干扰底栖生物膜。虽然已经评估了电捕鱼对大型无脊椎动物和鱼类的影响，但迄今为止，尚无研究量化其对底栖生物膜的影响。我们观察到底栖叶绿素a的积压存量下降在两个溪流中直接进行电钓之后。电钓鱼后，橡树溪，俄勒冈海岸山脉的三阶小溪中的常规生物膜种群平均下降了约15％，而out望溪的三阶部分中的平均生物膜种群平均下降了约34％，它位于美国俄勒冈州的西部喀斯喀特山脉。在电捕鱼两周后返回橡树溪，立种群已完全恢复到捕捞前的水平。虽然底栖生物被膜种群确实随着电捕鱼而下降，但与普通水流干扰和结垢到整个河流系统相比，其影响却很小。在橡树溪，