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Bacterial Productivity in the Water Column and Sediments of the Georgia (USA) Coastal Zone: Estimates via Direct Counting and Parallel Measurement of Thymidine Incorporation

Steven Y. Newell and Robert D. Fallon
Microbial Ecology
Vol. 8, No. 1 (Jun., 1982), pp. 33-46
Published by: Springer
Stable URL: http://www.jstor.org/stable/4250688
Page Count: 14
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Bacterial Productivity in the Water Column and Sediments of the Georgia (USA) Coastal Zone: Estimates via Direct Counting and Parallel Measurement of Thymidine Incorporation
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Abstract

Three methods of estimating bacterial productivity were compared using parallel samples of Atlantic Ocean water (within 0.25-15 km of the Georgia coast). The frequency-of-dividing cells (FDC) method and the [3 H]thymidine incorporation method gave results which were strongly correlated (r = 0.97), but the FDC estimates were always higher (X2 to X7) than the [3 H]thymidine estimates. Estimates of bacterial productivity ranged from 2-4 × 108 cells· l-1· h-1 at 0.25 km from shore to 1-9 × 107 cells· l-1· h-1 at 15 km. A method involving incubation of 3-μm filtrates and direct counting gave results that could not be easily translated into estimates of bacterial productivity. Application of the FDC method to sediment samples gave high productivity estimates, which could be not reconciled with productivity estimates based on sediment oxygen uptake.

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