Dufour Philippe auteur aut IRD Torréton Jean-Pascal auteur aut IRD text journalArticle eng text/pdf reformatted digital access 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) specialized MICROPLANCTON BACTERIE BIOMASSE PRODUCTION ANALYSE STATISTIQUE VARIATION SPATIALE 034MIORG 43 8 1305-1320 1996 0967-0637 https://www.documentation.ird.fr/hor/fdi:010013314 10.1016/0967-0637(96)00060-X 0967-0637 [F B010013314] 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 IRD - Base Horizon / Pleins textes 1998-03-31 2020-08-03 fdi:010013314 fre