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Title: Seasonal and spatial distribution of heterotrophic bacteria in relation to physico-chemical properties along Ennore coastal waters
Authors: Bharathi, M. D.
Sundaramoorthy, S.
Patra, Sivaji
Madeswaran, P.
Sundaramanickam, A.
Keywords: Heterotrophic bacteria;BOD;DO;Correlation analysis;Ennore
Issue Date: Mar-2018
Publisher: NISCAIR-CSIR, India
Abstract: Water samples were examined for total viable count and pollution indicator bacteria (total coliform, fecal coliform, Escherichia coli and Streptococcus faecalis). Salinity, pH, dissolved oxygen, biological oxygen demand, nutrients and Chlorophyll-a were examined to assess the physico-chemical condition of water. Statistically, insignificant seasonal variation was found in bacterial populations. Average abundances (CFU/ml) of the different heterotrophic bacteria of surface waters were: total viable count (2.1×106), total coliforms (1.3×105), fecal coliforms (1.5×104), Escherichia coli (1.1×104) and Streptococcus faecalis (0.4×104).  Spatially, the higher bacterial population was recorded in creek and shore regions with high concentration of nutrients. Significant positive correlation (p < 0.05) was observed between bacterial population and the nutrient concentration which suggest that elevated nutrient load favors the bacterial growth. However, bacterial populations showed positive correlations with biological oxygen demand, and negative relationship (p < 0.05) with salinity, indicating the dominating influence of anthropogenic activities in the coastal area.
Page(s): 587-597
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.47(03) [March 2018]

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