Relative abundance of biotic communities of plankton and zoobenthos in three ox-bow lakes of Eastern India |
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| Authors: | Debajyoti Chakrabarty Probir Biswas Sanjib Kumar Das |
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| Institution: | (1) Faculty of Education, Hirosaki University, Hirosaki Aomori, 036-8560, Japan;(2) Omote-machi 1-64, Aizu-wakamatsu, Fukushima, Japan;(3) Authority of the Protection and Management of Angkor and the Region of Siem Reap (APSARA), Siem Reap, Cambodia;(4) Institute of Nature and Environmental Technology, Kanazawa University, Kanazawa, Japan |
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| Abstract: | We made comparative studies of three tropical ox-bow lakes in India with different trophic states. The species number of zooplanktons
was negatively correlated with the degree of water eutrophication, and lakes of similar trophic status had higher similarity
of species. The most significant differences of species composition were observed with rotifers and zoobenthos. The density
and biomass of phytoplankton, rotifers, oligochaetes and chironomids tended to increase with increasing nutrients. We observed
a significant difference of dominant species in different waters, especially the eutrophic lake, which was dominated by a
few species of oligochaetes. The abundance of Tanypus bilobatus showed a highly significant correlation with the degree of eutrophication. Rotifers and zoobenthos showed considerably lower
biodiversity in the eutrophic lake. |
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