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Measurement of the nitrate-reducing potential by bacteria in saltmarsh sediment, using a thermal gradient block incubator, revealed seasonal physiological changes in the community. A mesophilic part of the nitrate-reducing community was always present, although it achieved maximum development at the end of the summer and minimum development at the end of the winter. In contrast, a distinct psychrotrophic part of the community achieved maximum development at the end of the winter but disappeared during summer. Chemostat enrichment of nitratereducing bacteria at I0 "C isolated predominantly Pseudomonos spp., but Vibrio spp. predominated in enrichments at 25 "C. The observed seasonal changes in situ might reflect differential seasonal selection of these two groups of bacteria.

Changes in the Nitrate-reducing Community of an Anaerobic Saltmarsh Sediment in Response to Seasonal Selection by Temperature