Keanekaragaman Makrozoobentos sebagai Indikator Kualitas Perairan Danau Siombak Kecamatan Medan Marelan Kota Medan

Abstract

Siombak Lake is an artificial lake formed as a result of sand dredging activities in an area formerly known as Paya Pasir and the lake is also influenced by the ups and downs because of the location of the lake is not far from the coastal region. The diversity of macrozoobenthic and measurement of physical and chemical factors is one of the parameters used to determine changes in water quality in the waters of Siombak Lake. The purpose of this study was to determine the physical and chemical factors in the waters of Siombak Lake in conjunction with water quality standards under PP 82 of 2001 and Storet methods as well as the density and diversity of macrozoobenthic. This study was conducted for three months that started from May to July 2014 in the waters of Siombak Lake District of Medan Marelan in Medan City. Based on the results obtained, the relationship between chemical physical factors Siombak Lake waters with water quality standards under PP 82 of 2001 and Storet method states that the waters of Siombak Lake belong to the class of the class C with the condition of being contaminated waters and value diversity index (H') of macrozoobenthic were obtained at each station study ranged from 1,091 to 1,480. These results indicate that the condition of the waters of Siombak Lake have a low diversity of macrozoobenthic. The results of Pearson correlation analysis showed that temperature, COD, phosphate, light penetration, pH and BOD5 have a positive correlation or have a direct relationship with the diversity of macrozoobenthic while salinity, DO and nitrate have a negative correlation, or have the opposite relationship.