Macrozoobenthos diversity as bioindicator of water quality in the Bilah river, Rantauprapat

Abstract

Bilah river is the largest river and is located right in the densely populated urban areas of Rantauprapat Labuhanbatu, North Sumatra. There are so many community activities that take place such as the baths, water supplay company, sand mining, agriculture, transportation and fisheries. The purpose of this study was to determine the diversity of macrozoobenthos as a bioindicator of water quality as well as determining of water quality. This study was conducted from November 2016 to October 2017, samples taken from five research stations. From the research results obtained macrozoobenthos which consisting of4 grade, 7 orders, 11 families and 12genera. The high density value is a genus of Neanthes sp (18.519 individu/m2) found at station 4. The highest value of diversity index (H’) of macrozoobenthos found at station 1 (2.052) and the lowest at station 5 (0.965). Person correlation analysis showed that the DO, BOD5, nitrate, phosphate, COD, substrate, light penetration, the solubility of oxygen, TSS, and TDS was positively correlated with diversity index of macrozoobenthos.