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A study of the phytoplankton in Concarneau Bay (Bretagne, France)was carried out on 68 June, 1978. Autotrophy was measuredby the 14C method and heterotrophic activity was estimated by14C labelled glucose and protein hydrolysate uptake. The measurementswere made on the whole of the sample as well as on the bacterialfraction, isolated by size-fractionation on Nuclepore 3 µmfilters. Moreover, a study of the relationships between naturalphytoplanktonic and bacterial populations was possible becauseof cell counts. The phytoplankton shows coastal characteristicsand diatoms are dominant. The distribution of the genus Chaetoceros,Nitzschia and Leptocylindrus seems to have an influence on therelationship between algae and bacteria so that environmentalconditions not only interfere directly at the bacterial levelon heterotrophic activity, but also through the specific compositionand abundance of the phytoplankton. 相似文献
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