Mangrove forests are considered as second most productive ecosystem in the world. They provide habitat for a wide variety of fauna and flora. The green algal mats are the common feature of mangrove forests. The aim of this study was to find out the distribution of algal mats formed by Cladophora coelothrix in the mangrove forests and to analyze the diversity of associated organisms with these algal mats at Sandspit backwater mangrove stand. Variation in species number and density in algal mat at two stations were observed. The diversity of Microphytobenthos (MB) is comparatively higher in full grown mats at both sites. In decomposed mats the species number and density of both MB and macrobenthos decreased significantly. The occurrence of C.
coelothrix mat and high number of MB abundance is related to the close proximity to water channels. From the management perspective, the results suggest that the abundance and diversity of macrofauna and abundance of microalgae may be useful as biological indicators to assess the environmental impact on mangrove habitat.
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