diversity of chironomidae (insecta: diptera) genera in taleghan river, alborz province, iran

Chironomidae is one of the most important elements of the aquatic benthos all over the world, which has its own ecological and biological importance in different aspects. the present study has been conducted to investigate the chironomid diversity in taleghan river in two seasons, spring and summer 2016 for six sampling points (asfaran, varkesh, mir, jostan, barikan and gooran). the sampling procedure was done by applying a simple dredge in five replications for each sampling point. the results have showed that there was a great diversity of chironomidae in taleghan river which composed of four sub-families and 21 different genera; chironominae (chironomus, robackia, stenochironomus, omisus, cryptochironomus, saetheria, cryptotendipes, microtendipes, paratendipes, constempellina and neozavrelia), orthocladiinae (bryophaenocladius, comptocladius, echinocladius, smittia, botryocladius, symbiocladius, psectrocladius and gymnometriocnemus), tanypodinae (unidentified genera in pentaneurini tribe) and diamesinae (potthastia and diamesa). ten genera have been reported for the first time in iran. diversity on abundance of each genus in different months and sampling points might be the result of the environmental conditions and water pollution.