Bottom-up and top-down control of bacterioplankton from eutrophic to oligotrophic sites in the tropical northeastern Atlantic ocean /Dufour, Philippe /Torréton, Jean-Pascal MICROPLANCTON BACTERIE BIOMASSE PRODUCTION ANALYSE STATISTIQUE VARIATION SPATIALE 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) 1996 text https://www.documentation.ird.fr/hor/fdi:010013314 fdi:010013314 Dufour Philippe, Torréton Jean-Pascal. Bottom-up and top-down control of bacterioplankton from eutrophic to oligotrophic sites in the tropical northeastern Atlantic ocean. 1996, 43 (8), 1305-1320 EN