Survey Effects of Benefited Gravels on Benthic Invertebrates in Tonekabon River
Subject Areas : Journal of Animal Biology
مژگان روشن طبری
1
(پژوهشکده اکولوژی دریای خزر)
Keywords: Caspian Sea, TonekaboonRiver, benthose, gravels,
Abstract :
This research was done for surveying effects of benefited gravels on benthic animals in Tonekaboon River in southern of Caspian Sea from 1382 to 1383. Seasonal sampling were done in two stations from upper and under the river and one station in benefited gravel area .the samples catch from stations were included 14 families belong to 9 orders from benthic animals. The density of samples population, in first station between 1020 to 5740 N/m3, in second station between 47 to 1230 N/m3, and third station between 251 to 5577 N/m3, were counted in. The least of abundance and biomass were belong to second station and 5% of total benthoses in this area, were content. Because of subversion of habitat and unstable bed of the river and Seston increasing, abundance of benthoses was decreased extremely. The effects of bed destructed to bank of river were traced.