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Activity of heterotrophic bacteria and its coupling to primary production during the spring phytoplankton bloom in the southern bight of the North Sea

par Lancelot, Christiane ;Billen, Gilles
Référence Limnology and oceanography, 29, 4, page (721-730)
Publication Publié, 1984

Article révisé par les pairs

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Résumé :

Parallel measurements were made of particulate and dissolved products of primary production, utilization rate of amino acids, monosaccharides, and glycollate, thymidine incorporation into DNA, and exoproteolytic activity before and during the spring bloom at different stations in the southem bight of the North Sea and in the English Channel. High correlations were found between the three methods used for estimating the activities ofheterotrophic bacteria. A reasonable quan¬titative agreement was found between the estimate of bacterial production based on thymidine incorporation into DNA and the estimate of total carbon utilization based on the sum of the utilization rates of amino acids, monosaccharides, and glycollate. A close coupling between mi¬croheterotrophic activity and primary production was demonstrated. Examination of the nitrogen balance during the spring bloom shows that microheterotrophic activity could play an important role in food-web dynamics by partly satisfying the nitrogen needs of phytoplankton, which rep¬resents about twice the minerai nitrogen stock initially present in the water column.