Effluence of Aquaculture on Bioabundance of Macroinvertebrates in Dohezar River in Tonekabon
Subject Areas : Journal of Animal Biologyجواد مسگران کریمی 1 , قباد آذری تاکامی 2 , حسین خارا 3 , روح الله عباسپور 4
1 - باشگاه پژوهشگران جوان، دانشگاه آزاد اسلامی، گروه شیلات، واحد لاهیجان، لاهیجان، ایران
2 - دانشگاه تهران، دانشکده دامپزشکی، تهران، ایران
3 - دانشگاه آزاد اسلامی، واحد لاهیجان، گروه شیلات، لاهیجان، ایران
4 - باشگاه پژوهشگران جوان، دانشگاه آزاد اسلامی، گروه شیلات، واحد لاهیجان، لاهیجان، ایران
Keywords: Water Quality, Tonekabon, Aquaculture, Dohezar River, Macroinvertebrates, Bioindex, Effluence,
Abstract :
The present study aims to explore, the Dohezar river biological diversity and abundance of Macro benthos using demographic indicators from October 2010- 0ctober 2011. Samples of macroinvertebrates were collected monthly from 7 stations designated as station 1 (upstream of the river course) to station 7 (downstream of the river course) for a period of 12 months. A combined total of 60 families and 18 orders and 7 class species of macroinvertebraits were encountered in the study. with the sampling of benthic fauna of some physic-chemical factors such as temperature, BOD5, DO, pH were also measured at the station in that the above factors does showed significant difference at the probable level of 5% (Pandlt;0.05) Except DO that does not showed significant difference at the above-mentioned stations.The fauna data surveyed with using SHANON and EPT andamp; EPT/Ch biological index. One-sided variance analysis test of index indicates existing a significant difference among the stations in probable level of 5 %( Pandlt;0.05).According to EPT index, the highest mean belongs to station 3with 70.66 score mean possibly due to minor contamination and the lowest score belongs to station 7 with 22 mean score which has the average level of organic contamination. The EPT/Ch index, the highest mean belongs to station 1with 1.11 score mean possibly due to minor contamination and the lowest score belongs to station 7 with 0.31 mean score which has the average level of organic contamination. . The SHANON index, the highest mean belongs to station 2with 2.27 score mean possibly due to minor contamination and the lowest score belongs to station 7 with 1.77 mean score which has the average level of organic contamination.
