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Phytoplankton diversity was investigated over a period of two years (2006 to 2008) inChatla floodplain wetland in Barak valley, Assam, North-East India. Site 1 and site 2 aretwo inlets and site 3 is a lentic system associated with vegetation cover ofCalamus tenuis and Baringtonia acutangula. Thefloodplain has a unique hydrology because of the presence of different types of habitats(inlets, fisheries, beels and outlets) which maintains a network among the floodplains,rivers and streams. Phytoplankton community composition, density and diversity werestudied in relation to environmental variables. All the variables were estimated byfollowing standard methods. Phytoplankton was collected by plankton net and quantitativeestimation was made by using Sedgwick Rafter counting cell. Phytoplankton communitycomprised 53 taxa represented by Chlorophyceae (31), Cyanophyceae (11), Bacillariophyceae(7), Euglenophyceae (1) and Dinophyceae (3). Phytoplankton taxa was dominated byVolvox sp., Nostoc sp., Eunotia sp.,Navicula sp., Euglena spp. and density was foundhighest in site 3 and lowest in site 1. Shannon diversity index (H′) for phytoplanktoncommunity varied between 2.4 to 2.65 indicating fairly high species diversity. The varyingmagnitude of correlationship among environmental variables and phytoplankton speciesdensity as shown by Canonical correspondence analysis (CCA) indicated that some of theenvironmental variables (water temperature, transparency, rainfall, nitrate and ammonia)are the driving factors for governing the phytoplankton species assemblages in Chatlafloodplain wetland. Fluctuation of phytoplankton density and community composition indifferent habitats indicated various niche apportionment as well as anthropogenicinfluences

Phytoplankton community and limnology of Chatla floodplain wetland of Barak valley, Assam, North-East India