Stimulation du potentiel de dégradation dans les eaux marines profondes par les bactéries barotolérantes colonisant les fèces du plancton migrateur = Stimulation of the potential heterotrophic activity in deep seawater by barotolerant bacteria colonizing faecal pellets produced by migrating zooplankton
Bianchi, A.; Garcin, J.; Gorsky, G.; Poulicek, M.; Tholosan, O. (1999). Stimulation du potentiel de dégradation dans les eaux marines profondes par les bactéries barotolérantes colonisant les fèces du plancton migrateur = Stimulation of the potential heterotrophic activity in deep seawater by barotolerant bacteria colonizing faecal pellets produced by migrating zooplankton. C. R. Acad. Sci., Sér. 3 Sci. Vie 322(12): 1113-1120. http://dx.doi.org/10.1016/S0764-4469(99)00111-0
In: Comptes Rendus de l'Académie des Sciences. Serie 3. Sciences de la Vie. Elsevier: Paris. ISSN 0764-4469; e-ISSN 1878-5565
At a depth of 1150 m in the northwest Mediterranean, amino acid uptake and bacterial biomass production rates increased, in a 12-day time interval, 5- and 30-fold, respectively. Simultaneously, bacterial response to pressure changes evolved from barophilic to barotolerant. During the same period, scanning electron microscope observations and in situ observations using Underwater Video Profiler showed a 2-fold increase in particle concentrations, mainly due to faecal pellet production by zooplankton. This input, nutrient rich and largely colonized with bacteria unaffected by pressure variations since they originated from organisms that regularly migrate up and down through the water column, could produce such microbial activity peaking in the deep water masses.
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