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Four human-associated bacteria, Pseudomonas aeruginosa, Salmonella newport, Escherichia coli, and Kkebsiella pneumoniae, were tested for survival in five freshwater sediments. Bacterial survival in continuousflow chambers was monitored over 14-day periods on sediments ranging from organically rich high-clay fractions to organically poor sandy fractions. Bacterial die-off ranged from 1 to 5 orders of magnitude in sediments. E. coli survived as long as or longer than S. newport. P. aeruginosa and K. pneumoniae tended to survive longer than E. coli. Survival of E. coli and S. newport was greater in sediments containing at least 25% clay. Good reproducibility allowed the development of linear models to describe die-off rates.

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The susceptibility to microbial decomposition of species of 14 algae was assessed in pond water and with inocula from several environments.