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[3 H]thymidine incorporation, the rate of reduction of iodonitrotetrazolium violet (INT) to INT formazan normalized to DNA, and the ratio of ATP to DNA were adapted to measure the activity of attached and unattached microbial assemblages of Bayboro Harbor, Fla. Activity measurements by [3 H]thymidine incorporation were made of cells attached to polystyrene culture dishes, in unfiltered water samples, and in the  1-μm fraction were higher than those for cells either in unfiltered water or in the &lt;1-μm-filtered fraction. By the rate of reduction of INT to INT formazan normalized to DNA and by ATP-to-DNA ratios, attached cells were also more active than cells in unfiltered water samples. These results indicate that the microenvironment afforded by attachment is a more beneficial habitat for microbial growth. Reasons for greater activity by natural populations of attached bacteria are discussed.

Activity Measurements of Planktonic Microbial and Microfouling Communities in a Eutrophic Estuary