Keanekaragaman dan Kelimpahan Makrozoobentos di Sungai Naborsahan Kabupaten Toba Samosir Sumatera Utara

Abstract

MELINDA SARI LUBIS. Diversity and Abudance of Makrozoobenthos in Naborsahan River of Toba Samosir Regency, North Sumatera. Supervised By MOHAMMAD BASYUNI and ANI SURYANTI This research described diversity and abundance of macrozoobenthos in Naborsahan River Toba Samosir Regency of North Sumatra. Macrozoobenthos sampling station consists of 3 stations using purposive random sampling method. Physical and chemical parameters were measured, namely temperature, currents, depth, brightness, turbidity, organic content on C-substrate, pH, DO, BOD5, and COD. Macrozoobenthos obtained consists of 5 phylum, namely Annelida, Arthropoda, Nemertea, molluscs and Platyhelminthes which are divided into 26 genera. Station I have a value of diversity (H ') of 2,25 with a high of 11 genera. Tryonia genus has the highest value of 14,429 ind/m2 abundance that is at the third station. The analysis used the Principal Component Analysis (PCA). Based on PCA analysis and diversity indices obtained equitabilitas index was inversely proportional to the brightness, turbidity, depth, temperature, DO and BOD 5, therefore affect the diversity index and the index of macrozoobenthos equitability.