BENTHIC FAUNA STATUS AS INDICATOR OF WATER QUALITY ASSESSMENT IN STREZHEVO ACCUMULATION
Rodne Nastova, Vasil Kostov, Natasha Gjorgovska, Vesna Levkov
Ss. Cyril and Methodius” University in Skopje, Institute of Animal Science, Blvd. Ilinden 92a, 1000 Skopje, Republic of Macedonia
rodne_nastova@yahoo.com
In the period March–October 2009 in the water of Strezhevo accumulation, Shemnica River and the alimenta¬tion 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 spe¬cial 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 macrozoo¬bentos 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.
Keywords: water quality; bottom fauna; assessment; worsening
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