Hydrobiological study of the small stream on the Czech–Moravian Highlands

Abstract

Zoobenthos of the Fryšávka Rivulet was investigated in the years 2007–2008. Research included also physico-chemical factors of water (temperature, pH, conductivity, oxygen saturation). Altogether, 144 taxa of zoobenthos were determined in the Fryšávka Rivulet: Coelenterata (1 taxon), Turbellaria (1 taxon), Oligochaeta (6 taxa), Hirudinea (1 taxon), Mollusca (5 taxa), Amphipoda (1 taxon), Decapoda (1 taxon), Acari (1 taxon), Ephemeroptera (18 taxa), Plecoptera (18 taxa), Heteroptera (1 taxon), Megaloptera (1 taxon), Planipennia (1 taxon), Trichoptera (36 taxa), Coleoptera (8 taxa), Diptera (44 taxa). Altogether, 76 taxa of zoobenthos were determined in Medlovka brook: Coelenterata (1 taxon), Turbellaria (1 taxon), Oligochaeta (2 taxa), Mollusca (1 taxon), Isopoda (1 taxon), Amphipoda (1 taxon), Acari (1 taxon), Ephemeroptera (14 taxa), Plecoptera (8 taxa), Megaloptera (1 taxon), Trichoptera (17 taxa), Coleoptera (6 taxa), Diptera (22 taxa).The average abundance of zoobenthos of the Fryšávka Rivulet was 3208 ind.m−2, the average biomass was 7.5 g . m−2, respectively. The same values for the Medlovka brook were: abundance 3238 ind.m−2 and biomass 5.8 g . m−2. The average value of the saprobic index for the whole Fryšávka Rivulet was 1.25 (oligosaprobity), for the Medlovka brook 1.42 (oligosaprobity).

Keywords

• Fryšávka Rivulet
• physico-chemical factors
• quality and quantity of zoobenthos
• saprobity indices