Plankton potential as bioindicator of trophic status of Lokop River Leuser Ecosystem

Lokop is one of the villages in East Aceh which has a watershed Leuser Ecosystem. Human activities have potential to disrupt Trophic Status River, such as use pesticides for agriculture, household waste and potassium fishing. It necessary research quality waters River. The plankton community present river can be an indicator environmental pollution by analyzing saprobic index. This study aims determine index diversity water Ecosystem River through was conducted at three stations. A sampling taken form 10 cc filtrate five replications were carried out each site. Water measurements include pH, TDS, Temperature, transparancy, depth, current. 11 species used indicators namely Cladophora sp, Diatoma elongatum, Fragilaria capucina, Oedogonium sp., Gonatozygon Lyngbya agardh, Melosira Merismopedia punctata, Microspora Pinnularia Synedra ulna. medium category. Based on Saprobic Index, level site not lightly loaded organic lowly pollution.Keywords:IsoprobikPlanktonBioindicatorLokop