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.
