Summary
A year long study on the utilization of glycose by the microorganisms of two Amazonian lakes (Tupe and Janauari) were studied. The bacterial populations of lake Tupe is approximately 1000 times smaller, and that of lake Janauari 100 times smaller than those of lakes from temperate regions. The mineralization capacity by heterotrophic bacteria is very low, and the organic substrate turnover time is very long.