Abstract
In the period March–October 2009 in the water of Strezhevo accumulation, Shemnica River and the alimentation canal samples of water and sediment were being collected for multidisciplinal research, with special regard to the quantitative and qualitative composition of benthic fauna. The field study was organized in season intervals, and special attention was paid to the critical months (June, July, August) with the goal of following-up the dynamics of the changes in the accumulation. The obtained results shows that the dominant groups of bottom fauna are Oligochaeta, Ephemeroptera,Trichoptera, Diptera and Plecoptera. According to the used indicators (composition of macrozoobentos fauna) it was found that there is a serious worsening of the water quality in the ecosystem. Increased presence of biodegradable organic matters was noticed, especially in the summer period.
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