ECOLOGY OF BACTERIOPLANKTON IN A NATIONALLY IMPORTANT LAKE, RABINDRA SAROBAR IN KOLKATAT. SAHA , A. ROY AND P.B. GHOSH
Studies on the abundance and distribution of the heterotropic bacterial communities of total bacteria and coliform bacteria including faecal and Salmonella revealed a distinct seasonal variation of their population with relatively higher values in monsoon and lower values during winter. Higher bacterial density was accompanied with higher population of both phytoplankton and zooplankton and showed significant positive correlation between each of them indicating their common source of occurrence. While insignificant correlation between bacterial population and phytoplankton production well substantiated the fact that the heterotrophic organisms showed relatively less affinity for fixed carbon accumulated in the system during photosynthesis. Besides, bacterial community also prefers to take easily available dissolved nutrients of inorganic forms, but not with combined forms. The influence of the physical factors like pH, total dissolved solids, temperature and dissolved oxygen on the bacterial density throughout the season were not prominent and probably suppressed by other operating forces. The interaction between and among the biotic components together with their release of organic substrates during survival could probably play a vital role for their abundance and distribution in the present aquatic system.
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