Hydrobiological studies in the gradient zone of the Vellar Estuary. 3. Heterotrophic bacteria

R. Chandran, K. Ramamoorthi


Tidal and seasonal variations in total heterotrophic bacterial population in water and sediment samples collected from the gradient zone of the Vellar Estuary were studied over a period of two years from January 1977 to December 1978. Although, there was no consistency in the seasonal variation of bacterial population in the water samples, high bacterial population was recorded only during the monsoon season. Similarly, variation in bacterial population due to tides was also inconspicuous. However, a subtle increase in the bacterial population was noticed at low tides. Differences in the bacterial population in surface and bottom waters was insignificant. Seasonal fluctuation in bacterial population of the sediment samples was less obvious with higher population during premonsoon and lower population during summer. Comparatively, the bacterial population in the sediments was two fold higher than that in the water column. Some relation between sediment composition and bacterial population with higher population in clayey silt and low population in sandy sediments


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