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The environmental and ecological determinants of larval survival and recruitment of Scomber scombrus were investigated in May 1987, during an interdisciplinary cruise on the continental slope at the edge of the Celtic Sea. The present paper relates some of these results to the microbial characteristics. Three locations were chosen along a narrow horizontal scale between the stratified waters of the continental shelf and the mixed waters of the shelf-break. In the subsurface layers, primary productivity as well as chlorophyll biomass increased proportionally to the stratification. Conversely, bacteria cell numbers progressively increased from the stratified water column to the mixed one. Bacterial net production was twice as high in mixed as in stratified waters. A correspondence analysis showed differences in the composition and production of phytoplankton and bacteria at the 3 locations. This analysis characterized mixed waters by bacterial biomass, bacterial carbon production, and ciliate biomass, transitional waters by diatom and dinoflagellate biomass, and stratified waters by Cryptophyceae, flagellates and total phytoplankton biomass. Chlorophyll appeared independent of the 3 locations, suggesting that chlorophyll alone is not sufficient to study this particularly variable and complex environment. Bacterial speclfic growth rate and phytoplankton carbon production were also independent of the 3 locations. The classical food web structure was found relative to the degree of stratification of the water masses. But, compared to previous knowledge of the microbial distribution, an unusual importance of bacterial and ciliate components in the mixed waters was observed, related to other characteristics of the food chain at this station, such as larval mortality. It is suggested that the spring tidal regime and an early establishment of the food chain were responsible for these results.

Phytoplankton and bacteria over the transient area of the continental slope of the Celtic Sea in spring. I. Vertical distribution and productivity