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The specific growth rate of heterotrophic bacteria is determined by dividing the production between the biomass, is an indicator of the capacity of the bacterial population to replace its biomass. The eukaryotic heterotrophic flagellates and ciliates are important grazers on bacteria, thus potentially influencing the abundance by selective feeding within the ‘microbial loop’. Mid stream surface water samples from all the water courses selected were collected in a sterile glass bottles. Water samples were screened through Whatman GF/A (1.63 μm nominal pore size) glass micro fibre filters. The SGR was calculated by taking only the abundance of bacterioplankton at the beginning (0 h) and at the end (48 h) incubation period. Mean value of SGR of bacteria was similar in the rivers Harangi (0.0024 h), Hemavathy (0.0031 h), Lokapavani (0.0030 h) and Cauvery (0.0033 h). But it was more and significantly different in the river Lakshmanatheertha (0.0042 h). More negative variations of SGR of bacteria was noticed in the river Lakshmanatheertha (15); compared to rivers Harangi (2), Hemavathy (1), Lokapavani (3) and Cauvery (2). The negative growth rates were due to decrease in the observed bacterial cell counts after 48 h incubation. The calculations of Pearson’s Correlation Coefficients after log10 transformation showed both negative and positive relations of bacterial abundance with the SGR. The negative correlation implies that, lesser the bacterial abundance higher will be the SGR of planktonic bacteria. Relatively low bacterial abundance could be ascribed to the differential interactions among bacterial growth rate, substrate supply, bacteriophages, bacterivory and other predation in regulating bacterial abundance.

international journal of scientific and research publications

Bacterial abundance and potential grazing (top-down) influence on Specific Growth Rate of heterotrophic bacteria in the river Cauvery and its upstream tributaries in southern Karnataka