Keanekaragaman Makrozoobentos di Sungai Bah Bolon Kabupaten Simalungun Sumatera Utara

Abstract

“The diversity of macrozoobenthos in Bah Bolon River Regency of Simalungun Provinceo of North Sumatera” has been observed and it was identified in Management Laboratory of Natural Resource and Environment, Study Program of Biology, Faculty of Mathematic and Natural Science, University of North Sumatera, Medan. The sample was taken from four different areas using Purposive Random Sampling method. The diversity of macrozoobenthos which is found such as Annelida, Arthropoda, and Molusca filums and devided in 20 genus. Genus Cyrnellus has the highest density wich is found in disposal waste of cigarette factory location with 87,40 ind/m2 and genus Hellobdella has the lowest density wich is found in agricultural location with 0,73 ind/m2 . The disposal waste of ice factory location has the highest diversity index of macrozoobenthos with 1,94 and the agricultural location has the lowest diversity index of macrozoobenthos with 1,20. The free area from humans activities has the highest uniformity index with 0,74 and the agricultural location has the lowest uniformity index with 0,53. The psychochemical factors such as temperature, intensity of lights, DO, BOD5, COD, and sanuration of oxygen have a strong correlation with diversity of macrozoobenthos.