KOMPOSISI DIATOM EPIPELIK DAN EPIFITIK DI PERAIRAN SUNGAI MESJID KOTA DUMAI PROVINSI RIAU

Abstract

The research was conducted in June 2012 in water the Sungai Mesjid of Dumai City Riau Province. This research aims to describe how the composition of epipelic diatom the sediments and epiphytic on mangrove communities in the water Sungai Mesjid of Dumai City Riau Province and environmental factors that affect it. The data obtained by observation, measurement and sampling in the field, followed by the identification of diatom samples at Integrated Laboratory of Marine Sciences, Faculty of Fisheries and Marine Science, University of Riau. Total species of epipelic diatom that were consisted of 53 species and 16 species epiphytic diatom.Epipelik diatom species most frequently encountered is Navicula elegans, Navicula membranacea and Nitzschia frigida. While epiphytic diatom species only Rhabdonema arculatum which can be found at all stations. The species is a species that has a high tolerance to various substrates. From the value of diversity index (H '), dominance (D), equability (e) and the measurement of water quality parameters shows that the condition of the waters in the Sungai Mesjid of as whole is still in balance, there is no competition for place nor food and water quality middle level of contamination.