Abstract: A survey was conducted to investigate the community structure and biodiversity of macrozoobenthos in the Hailang River during August in 2011.A total of 56 species of macrobenthos were collected,belonging to 14 orders and 31 families,among which aquatic insects were the predominant,with 43 species(75.44% of the total) belonging to 21 families and 7 orders.A total of 51 species of macrobenthos were found in Endemic Fish Natural Aquatic Germplasm Resource Reserve Zone in Hailang River,belonging to 13 orders and 30 families,among which Ephemerida,Trichoptera and Diptera were prevalent groups in the number of community.The macrobenthos were found at annual average density of 180.19 ind·m-2 and biomass of 3.20 g·m-2.The maximum was found to be the predators with 25 species in all functional feeding groups,followed by 15 collectors,10 scrapers and 6 shredders.The prevalent macrobenthos species were of Brachycentinao,Setodes,Siga substraiata,Epeorus uenoi and Stenpsyche griseipennis in present Hailang River.The water quality was assessed to be basically similar and to be clear in endemic fish Natural Aquatic Germplasm Resource Reserve Zone in Hailang River by Shannon-Weiner index,biotic index(BI) and Simpson index,with coincident change tendency of apinoid grade.

Key words: Hailang River, aquatic germplasm resource reserve zone, macrobentho, community structure, biomonitoring, water quality