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The contribution of zooplankton to flows of dissolved organic carbon was studied for the food web of coastal plankton assemblages off Southern California, USA. Seawater samples including active macrozooplankton were labelled with I4CO2. The time course of I4CO2 incorporation into size fractions of the plankton and dissolved organic materials was determined. Changes in extracellular concentrations of free primary amines and dissolved saccharides were also measured. In addition, the time course of 3H-thymidine incorporation into bacteria was determined along with bacterial cell counts. By comparing carbon flows in samples with macrozooplankton and without macrozooplankton, we evaluated the role of macrozooplankton in the flux of carbon to bacteria and dissolved organic matter. One-half or more of theI4C-carbon in the bacterial size fraction could be due to small photosynthetic forms or the remains of microplankton disrupted by the filtration used in the size fractionation. Moreover, most of the carbon flowing to bacteria from the macrozooplankton was not labelled by I4C and was proportional to the number of macrozooplankton. Conservative estimates of this unlabelled carbon flux to bacterial biomass due to macrozooplankton were 3 and 10 % of the I4C assimilated photosynthetically. Potential artefacts resulting from experlmental manipulations are considered.

Origins of Dissolved Organic Matter in Southern California Coastal Waters: Experiments on the Role of Zooplankton