Abstract
Uniformly 14C—labelled glucose was used to estimate maximum potential uptake kinetics (WMAX) in unfractionated and <64 μm, and <10 μm screened water samples. Most of the activity in the estuary was found in the size fraction >10 μm, in the summer, and in the tidal creeks. The uptake (VMAX) of labelled lactic acid was > glucose > glycolic acid > aspartic acid and alanine. Glycolic acid was respired most rapidly, followed by aspartic acid, lactic acid, alanine and glucose. Most of the particulate organic carbon (POC), adenosine triphosphate (ATP), and platable bacterial cells (CFU) were in the 10 μm fraction. Glucose VMAX values were significantly correlated with ATP and CFU, and lactic acid VMAX values with CFU only. VMAX and turnover times in the unfractionated water were 57% lower and 29% greater, respectively, than in the <64 μm fraction sample, and (K / Sn) values were at times very dissimilar among fractions of the same water. These results were attributed to the physical separation of the plankton community, nutrient fluctuation in the sample, and microheterotroph diversity and distribution on particles.
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