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Macrophytes of Dhir Beel Wetland in Assam, India in relation to its limnological factors
Abstract
Dhir Beel, an oxbow lake in Western Assam, India, is a heaven for diverse flora and fauna, fostering a rich ecosystem in freshwater habitats. The study aimed to address pollution, encroachment, siltation, and overfishing concerns in Dhir Beel. Over a three-year period, samples were collected from five different sites for water and macrophytes. Physico-chemical parameters were assessed using the APHA method, and macrophytes were identified through a thorough identification procedure. The study revealed a total of 82 species, with dicots, monocots, and pteridophytes representing 38, 40, and 4 species, respectively. Notably, Nymphaeaceae, Poaceae, and Equisetaceae families played significant roles, occupying 11.21%, 25%, and 25% of the macrophyte composition, respectively. The emergent macrophytes monocots Poaceae were dominant in terms of species diversity, while free floating macrophyte P. stratiotes and A. nilotica were dominant. The study of diversity indicated that undisturbed sites (Site- IV and V) exhibited significant macrophyte diversity compared to polluted sites (Site-I and II), emphasizing the need for well-planned conservation efforts in this ecologically valuable oxbow lake.
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