Publications des scientifiques de l'IRD

Dufour Philippe, Torréton Jean-Pascal. (1996). Bottom-up and top-down control of bacterioplankton from eutrophic to oligotrophic sites in the tropical northeastern Atlantic ocean. Deep-Sea Research : Part 1, 43 (8), p. 1305-1320. ISSN 0967-0637.

Titre du document
Bottom-up and top-down control of bacterioplankton from eutrophic to oligotrophic sites in the tropical northeastern Atlantic ocean
Année de publication
1996
Type de document
Article
Auteurs
Dufour Philippe, Torréton Jean-Pascal
Source
Deep-Sea Research : Part 1, 1996, 43 (8), p. 1305-1320 ISSN 0967-0637
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)
Plan de classement
Micro-organismes [034MIORG]
Descripteurs
MICROPLANCTON ; BACTERIE ; BIOMASSE ; PRODUCTION ; ANALYSE STATISTIQUE ; VARIATION SPATIALE
Localisation
Fonds IRD [F B010013314]
Identifiant IRD
fdi:010013314
Contact