تعیین کیفیت آب رودخانه فوشه (استان گیلان) با استفاده از شاخص های زیستی ماکروبنتوز

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 ۲۰۱۷ with a surber sampler (area of ۹۰۰ cm۲, mesh size of ۳۰۰ µ) with ۳ replicates in each sampling site. The collected macroinvertebrate samples were preserved in ethanol ۹۶% and transferred to the laboratory for enumeration identification. In Total ۴۹۲۸ macrobenthoses specimens were identified belonging to ۲ phyla, ۳ classes, ۸ orders, ۲۵ families and ۳۱ genera. Insect larvae dominated the samples. The most abundant groups of macrobenthoses were Diptera (۵۳.۰۹%) and family Simuliidae. Trichoptera (۲۸.۴۴%) with dominant family of Hydropsychidae and Ephemeroptera (۱۶.۲۴%) 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 ۱ and ۲ (upstream) in suspected to pollution, site ۳ and ۴ (downstream) in moderately pollution classes. According to the Shannon wiener index the sampling sites ۱, ۲ and ۴ were relatively polluted and sampling site ۳ was polluted (P≤۰.۰۵).

Keywords:

شاخص تنوع , رودخانه فوشه , شاخص زیستی هیلسنهوف , ماکرو بنتوز