title: Starvation effects on Escherichia coli and aquatic bacterial responses to nutrient addition and secondary warming stresses.
abstract: A gram-negative polar flagellated rod, isolated from a Colorado mountain stream and considered to be an Aeromonas sp., a mixed aquatic microbial population, and a culture of Escherichia coli were starved to determine their responses to the short-term presence of nutrients and mild warming stress (49.5 C for 2 min) in relation to starvation time. At the beginning of the starvation period, the Aeromonas isolate was extremely sensitive to the secondary warming stress. This response was markedly diminished after a 3-week starvation period. The mixed aquatic microbial population showed a similar trend in becoming less sensitive to stress with increased starvation. E coli under similar conditions, became more sensitive to the secondary stress after exposure to glucose. Respiration measurements after glucose additions also indicated that E. coli responded in a different manner to starvation stress and glucose presence than the Aeromonas isolate. The increased sensitivity of E. coli to secondary stress and short-term nutrient availability after starvation may contribute to the exclusion of this organism from aquatic environments.
mesh_terms: D000333:Aeromonas / Q000378:metabolism*; D004926:Escherichia coli / Q000378:metabolism*; D005618:Fresh Water; D005947:Glucose / Q000378:metabolism; D006358:Hot Temperature; D010101:Oxygen Consumption; D010461:Peptones / Q000378:metabolism; D013045:Species Specificity; D014871:Water Microbiology
chemical_list: D010461:Peptones; D005947:Glucose