Horizon 1 1 17 ACLN : Articles dans des revues avec comité de lecture non répertoriées par l'AERES Deep-Sea Research : Part 1 1305-1320 MICROPLANCTON BACTERIE BIOMASSE PRODUCTION ANALYSE STATISTIQUE VARIATION SPATIALE OCEAN ATLANTIQUE TROPICAL 1996 fdi:010013314 ENG Deep-Sea Research : Part 1 0967-0637 8 10.1016/0967-0637(96)00060-X https://www.documentation.ird.fr/hor/fdi:010013314 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_49-50/010013314.pdf 43 Horizon (IRD) Bacterioplankton biomass and production were determined over the whole water column of a eutrophic, a mesotrophic and an oligotrophic site (2300, 3200 and 4500 m deep) in the tropical NE Atlantic Ocean during a EUMELI cruise in May-June 1992. This resulted in an exceptionally large amplitude of data, with abundance, biomass and production. These data were analyzed in order to determine whether bacterioplankton was controlled by bottom-up or top-down processes. Regressions of log-transformed bacterioplankton biomass versus log-transformed production were tested at the different sites and in different layers. Slopes of 0.40-0.55 suggest that bacterioplankton is moderately controlled by bottom-up processes increasing from the eutrophic coastal site to the open ocean oligotrophic site and from surface layers (< 250 m) to deep waters. These conclusions are in agreement with other indices of bottom-up control like cell size, doubling times of the biomass, per cent of active cells, and relationships of bacterial biomass versus phytoplanktonic biomass and production. (Résumé d'auteur) 034MIORG