STRUCTURE OF BENTHIC FAUNA IN TWO FLOODPLAIN WETLAND ECOSYSTEMS OF WEST BENGAL
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Authors
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UTPAL BHAUMIK
Central Inland Fisheries Research Institute, Barrackpore, Kolkata - 700120
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I C MITTAL
Department of Zoology, University of Kurukshetra, Kurukshetra, Haryana
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P DAS
Indralok Estate, Kolkata
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T PARIA
Central Inland Fisheries Research Institute, Barrackpore, Kolkata - 700120
Abstract
An investigation was carried out in two floodplain wetlands with open (Amda) and closed (Suguna) system. The density of benthic population varied between 42 no. m -2 and 94 no. m-2 in Amda whereas in Suguna it ranged from 60 no. m-2 and 106 no. m-2. Seasonal fluctuations in water column were conspicuous and mostly dependent on the replenishment resources and volume. A mixed and balanced population of diversified fauna constituted the benthic population of the
investigated ecosystems. The diversity was maximum during winter season with coincidence of favourable temperature, dissolved oxygen and other physico-chemical parameters besides, optimum solar radiation. Richness of benthic
structure in closed system resulted in higher fish production (1,570.05 kg ha-1yr-1) than that of the open system (384.4 kg ha-1yr-1).
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