Keanekaragaman Makrozobentos sebagai Bioindikator Perairan Sungai Batang Toru Kabupaten Tapanuli Selatan

Abstract

Batang toru river is one of the largest river in the South Tapanuli, with a length of 69.32 km. Downstream, the current beach ends into the sea after the first split the water into the lake Siais, where as upstream Batang Toru crossing Tarutung, North Tapanuli The water from this river used for drinking water, plantation/agriculture, sand dredging, tourism, transportation facilities. The people activities along this rivers could influence its water quality, because the waste produced by those people activities is thrown to this rivets directly. The changes of the water qualities in the river induce the change of macrozoobentos community. For that reason, it is necessary to observe the Batang toru river water quality based on macrozoobenthic indicator. The aim of the research were to know the diversity of macrozoobenthic at bioindicator in Batang toru river and to determine the Batang Toru river quality level in relation to physical-chemical and biological of the river. The research was carried out from November 2010 until March 2011 in Batang toru river. Sampel were collected from three stations by purposive Random Sampling method. Surber net and Eckman Grabb were used to taken the sampel. Samples were identified in Laboratory PSDAL, Department of Biology, Faculty of Mathematic and Natural Sciences of North Sumatera University. The result showed that there three classes within nine ordo, 15 family and 15 genera of macrozoobenrhic were founded. Goniobasis sp has the highest density index with 30,86 individua/m2 founded in second station, and Macronychus Naucarinae and Rhithrogena first station has the lowest density index with 1 ,23 individu/m2 and Atherix uand Neureclipsis on station . The Highest Index Diversity (H) was founded at the first station with 1,668 and the lowest value was founded at the 2st station with 1,506. According to the analysis Spearman corrclation o.f light penetration, pH, DO has positive correlated to diversity of Macrozoobenthic, while Organic Substrat , phosphate, Nitrate, BOD5, TDS, ZSE COD and Temperature has negative correlation to the Diversity of Macrozoobenthic.