Analisis Keragaman Makrozoobentos Sebagai Bioindikator Kualitas Perairan Kali Pacal, Kabupaten Bojonegoro

Abstract

Rivers are the most important source of water after wells for humans. Rivers are inland water ecosystems that are directly related to humans. Various community activities around the river can result in physical, chemical and biological changes in the waters. The purpose of this study was to determine the diversity of macrozoobenthos and to determine Family Biotic Index in the Pacal River, Bojonegoro District. The type of research used in descriptive exploratory sampling method. The research was conducted in February – March 2023 by dividing the location into three stations with various habitat types. the data obtained was then identified and analysed using the Shannon-Wiener Index (H’), Evenness Index (E), Dominance Index (D), and Family Biotic Index (FBI). Based the observation, there were 8 species of macrozoobenthos with the two most species of  being Pleurocera and Tubifex. The highest level of macrozoobenthos diversity was found in station 1 is H’=1,20. The highest evenness index in station 1 is E=0,67. The highest dominance index in station 3 is D=0,90. The highest Family Biotic Index in station 3 is FBI=7,89 which indicates that the waters at that station are heavily polluted by organic matter.