Abstract
The distribution and densities of aerobic heterotrophic bacteria were measured in the surface layers of Lake Superior from May to November, 1973, and correlated with temperature and certain nutrient levels.On a lake-wide basis bacterial densities were closely related to temperature, increasing from June until September, after which their levels started to decline. A similar relationship was noted in the nearshore areas of the lake until the September-October period, after which heterotroph densities increased despite the decrease in temperature (4°C) in November. The importance of psychrophilic bacterial species in the nearshore areas of the lake and the relationships between heterotrophs and nutrients in the lake are discussed.
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