Keanekaragaman Makrozoobentos di Danau Toba Desa Haranggaol Kecamatan Haranggaol Horisan Kabupaten Simalungun

Abstract

The aims of study to determine the diversity of macrozoobenthos and to analize the relationship of water quality (temperature, pH, DO, BOD5) diversity index of macrozoobenthos in Toba Lake, Village Haranggaol, Haranggaol Horisan District, Simalungun Regensi. Observations were carried out three times in three research stations. Sampling was conducted three replications at each station. Regression analysis was used to determine the relationship of macrozoobenthos diversity with environmental factors (physical and chemical). Based on the results obtained macrozoobenthos diversity index ranged from 1.53 to 1.90, uniformity index ranged from 0.82 to 0.95, the population density ranges from 332 to 645 ind/m2 and relative density ranged from 99.95 to 99.98 %. Regression analysis showed that the correlation coefficient (R) of 0.710 indicates that the relationship between water quality against the relatively strong macrozoobenthos diversity index and the coefficient of determination (R2) obtained at 0.505.