Survival of natural sewage populations of enteric bacteria in diffusion and batch chambers in the marine environment.

Applied and Environmental Microbiology
E J Lessard, J M Sieburth

Abstract

The survival of natural populations of Escherichia coli and enterococci in sewage was measured in large-volume diffusion chambers in an estuary and a salt marsh. The 5-liter chambers, with polycarbonate membrane sidewalls, were found to be suitable for up to week-long experiments. Decay rates, measured monthly from February to August 1978, ranged from 0.042 to 0.088 h(-1) (time for 90% of the population to die = 25 to 55 h) for E. coli and 0.019 to 0.083 h(-1) (time for 90% of the population to die = 29 to 122 h) for enterococci and were significantly correlated with temperature. In contrast to the diffusion culture experiments, the decay of E. coli in batch culture did not correlate with temperature. Enterococci survived longer than E. coli in the Narragansett Bay (estuary) experiments, but survived less well in the more eutrophic salt marsh. The effect of light on survival was examined with light/dark experiments and sampling at frequent intervals over the diel cycle. Diel changes in survival were not evident in the Narragansett Bay experiments. E. coli, however, exhibited a diel pattern of growth during the day and death at night in the salt marsh. There was no significant difference in decay rates between light and dark dif...Continue Reading

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Citations

Feb 11, 2014·Water Resources Research·Dipankar DwivediBruce J Lesikar
Jan 1, 1988·Archives of Microbiology·P R ScheuermanM Alexander
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Jun 28, 2021·Journal of Microbiological Methods·Larry J WymerAlfred P Dufour

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