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Sea-surface microlayer and surface water samples, collected in the Bay of Marseilles (France), were compared for 14C-glucose incorporation and catabolism under natural radiation by means of incubation in glass and quartz tubes as compared to standard dark bottles. Beforehand. possible interference by phytoplankton during light exposure was investigated for one sample of each type by means of 1 pm size-fractionation and/or cycloheximide treatment. Though size-fractionation appeared to be unsuitable for the surface film sample, the cycloheximide experiment data suggested that the recorded activity was primarily due to bacteria. In a set of surface microlayer and associated underlying water samples, the former exhibited higher (ca 10-fold) heterotrophic activity. For both kinds of samples, a decrease in 14C-CO2 production (by 4 8 % ) was observed in glass tubes but no difference was found between glass and quartz tubes. Since the remaining activity (> 50 O/O) could have been underestimated due to removal of produced 14C-CO, by photoautotrophs during light exposure, this result is evidence of the extent of heterotroph~c actlvity at the sea-air interface.

14C-glucose uptake and 14C-C02 production in surface microlayer and surface-water samples: influence of UV and visible radiation