Abstract

This study has been conducted in the river section of the Gorky Reservoir in the zone affected by the heated water discharge from the Kostroma hydroelectric power plant during the growing season (May–November) of 2021. The reduced species richness is observed in the sites of the maximum water heating, which, however, quickly return to the initial values in the downstream section of the river. The lethal effect of warm waters on zooplankton is mainly manifested in the summer, when the natural warming of the river waters is influenced by the heated water discharge from the Kostroma hydroelectric power plant. In autumn, the warming effect of heated waters, on the contrary, promotes the better survival of organisms. Fish reach a high abundance in the study area by the end of summer, when the juvenile leave shallow waters. In the autumn period, the fish redistribution and a significant increase in the abundance occur in the area of heated waters compared to the background sites. The results indicate the absence of an environmentally significant lethal effect. Local plankton losses are quickly compensated for due to high reproduction rates and the short-cycle development of invertebrates. No lethal effect of the exposure to high temperatures on fish was found.

中文翻译：

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高尔基水库受科斯特罗马水力发电厂热水影响河段水生生物的丰度、分布和死亡率

摘要

这项研究是在高尔基水库河段进行的，该水库位于 2021 年生长季节（5 月至 11 月）受科斯特罗马水力发电厂热水排放影响的地区。最大的水加热，但是，在河流的下游部分很快恢复到初始值。温暖水域对浮游动物的致命影响主要表现在夏季，此时河水自然变暖受到科斯特罗马水力发电厂热水排放的影响。秋季，热水的升温作用反而促进生物更好的生存。夏末，当幼鱼离开浅水区时，研究区域的鱼类数量达到很高。在秋季，与背景地点相比，热水区域的鱼类重新分布且丰度显着增加。结果表明不存在对环境显着的致命影响。由于无脊椎动物的高繁殖率和短周期发育，当地浮游生物的损失很快得到补偿。没有发现暴露在高温下对鱼类有致命影响。