عنوان مقاله [English]
نویسندگان [English]چکیده [English]
This research was conducted to the study of population structure macrobenthic fauna in six rivers (Ghale Dibaj, Zardavan Dibaj, Sarcheshmeh Dibaj, Absij, Abrendan, Kalateh pirkhoshdar) of northen Damghan during a period of one year from July 2009June 2010. The attention of Macrobenthic distribution and diversity and the study was conducted, Sample was Taken monthly basis using a mesh frame Surber Sampler was 35andtimes;35 Centimeter. Samples collected were fixed with 4% formaldehyde solution and then transferred to the laboratory. Throughout the year18 families belonging to11orders were identified. Their abundance changed in different months of the year. Most of the individuals belonged to five order: Amphipoda, Diptera, Ephemeroptera, Trichoptera and Tricladida that were the most abundant benthics, which dominant Order were members of Gammaridae Family in all of station (exception of six station). Bedding material had a direct effect on biodiversity and species density. Existingconditionsof the regionshowed thatexisting sources(exceptriversKalatePyrkhoshdar) forfishincludingtroutSalmon cellaranditisexcellent.