بررسي فون كف زي نهر زرين گل علي آباد كتول، استان گلستان در آبان سال 1386

Benthic fauna study of Zarrin-Gol Stream, Aliabad-Katool, Golestan Province

Benthos has an important role in aquatic ecosystem as food material, transporting and recycling the food and mineralizing the organic materials. For this study nine physiochemical factors of water were measured with water checker and photometers and discharge, depth, width, and type bottom of stream. Likewise benthoses were sampled with surber Sampler (covered 930.25 cm2) from 13 stations, during November 2007. Sample analysis showed 8 animal groups, which some recognized as orders, some in family, and genus. Three dominant macro benthos communities in Zarrin-Gol River contained ephemeroptera, diptera (simulidae, chironomidae) and trichoptera. Other taxa with less abundant consisted of pelecoptera, tabanidae, hironidae, and oligochaeta (.Lumbricus). Physicochemical parameters, phosphate, pH and nitrite had significant differences on the ephemeroptera, nitrate on the trichoptera, and phosphate on the diptera frequency. The maximum and minimum total abundance were 3858 ind.mʹ2 in station 2 and 280.7 ind.mʹ2 in station 13. By the Shannon index, maximum and minimum diversity was in reach. By the evenness, reach and mead stream had the lowest and highest species homogeneity. By Jaccard index, adjusted stations had not significant difference on the having of benthic fauna.