Determination of water Quality the Fusheh River in Guilan Province using Macrobenthose Biotic Indices

Document Type : Ecology

Authors

1 Department of Fisheries , Faculty of Natural Resources, Guilan University, Sowmeh sara, Iran

2 Department of Fisheries , Faculty of Natural Resources, Guilan University, Someh sara, Iran

Abstract

Water quality of Fusheh River (Guilan province) was examined using macrobenthose density, Hilsenhoff Biotic index and Shannon Winner diversity indices. Four sampling sites were selected and monthly sampling was conducted from May to December 2017 with a surber sampler (area of 900 cm2, mesh size of 300 µ) with 3 replicates in each sampling site. The collected macroinvertebrate samples were preserved in ethanol 96% and transferred to the laboratory for enumeration identification. In Total 4928 macrobenthoses specimens were identified belonging to 2 phyla, 3 classes, 8 orders, 25 families and 31 genera. Insect larvae dominated the samples. The most abundant groups of macrobenthoses were Diptera (53.09%) and family Simuliidae. Trichoptera (28.44%) with dominant family of Hydropsychidae and Ephemeroptera (16.24%) and the dominant family of Baetidae. Based on tolerance scores assigned to each family considering their resistance or sensitivity to pollution the Hilsenhoff Biotic Index was calculated. The results obtained from this Index categorized the Fusheh River in GOOD (some organic pollution) water quality class.BMWP/ASPT Biotic indices categorized site 1 and 2 (upstream) in suspected to pollution, site 3 and 4 (downstream) in moderately pollution classes. According to the Shannon wiener index the sampling sites 1, 2 and 4 were relatively polluted and sampling site 3 was polluted (P≤0.05).

Keywords


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