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This study illustrates the sporadic distribution of metals in fluvial systems flowing from catchments to urban settlements. This is a detailed study prognosticating the deteriorating quality of rivers at specific locations due to metal pollution. Heavy metals like cadmium, lead, nickel and mercury are prominent in industrial sector. Contour plots derived using spatial and temporal data could determine the focal point of metal pollution and its gradation. Metal values recorded were cadmium 157 mg/L, lead 47 mg/L, nickel 61 mg/L and mercury 0.56 mg/L. Prokaryote diversity was less in polluted water and it harboured metal tolerant bacteria, which were isolated from these polluted sites. Actinomycetes like  Streptomyces  and several other bacteria like  Stenotrophomonas  and  Pseudomonas  isolated from the polluted river sites exhibited changes in morphology in presence of heavy metals. This stress response offered remedial measures as  Streptomyces  were effective in biosorption of cadmium, nickel and lead and  Stenotrophomonas  and  Pseudomonas  were effective in the bioaccumulation of lead and cadmium. Eighty-nine mg of lead and 106 mg of nickel could be adsorbed on one gram of  Streptomyces  biomass-based biosorbent. Such biological remedies can be further explored to remove metals from polluted sites and from metal contaminated industrial or waste waters.

Status of metal pollution in rivers flowing through urban settlements at Pune and its effect on resident microflora