Keanekaragaman Plankton di Pantai Sujono, Desa Lalang, Kecamatan Medang Deras, Kabupaten Batubara, Sumatera Utara

Abstract

Plankton diversity can be used as a baseline data to evaluate quality of water. This study was aimed to determine the plankton diversity in Sujono Beach, Lalang village, Medang Deras District of North Sumatra. The method of determining sampling points was purposive random sampling. Sampling was done by filtering as much as 25 litre of water into a plankton net then was transferred into the sample bottles. The specimen were identified in the Basic Science Laboratory, University of North Sumatra. Plankton that were found were belonged to the 11 classes, 19 orders, 20 families and 26 species. Plankton diversity ranged from 1.78 to 2.33 and classified as relatively moderate. The light penetration, salinity, dissolve oxygen, pH, light intensity, water temperature and BOD5 were strongly correlated to the diversity of plankton.