Surface-depth and coastal-ocean gradients in diversity and activity of prokaryotes in the canary CTZ region

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Colaborador: Baltar González, FedericoAristegui, J.Herndl, Gerhard J.Gasol, Josep M.Hernández-León, Santiago
???metadata.dc.contributor.other???: Facultad de Ciencias del MarDepartamento de BiologíaCentro de Biotecnología Marina
Materias : ProcariotasFitoplancton marinoÁreas de afloramientoCanariasNoroeste de África
Fecha de publicación : 2007
Fecha de depósito: 8-oct-2009
Tipo de documento: Resumen
En : Symposium GLOBEC-IMBER España, Valencia, del 28 al 30 de marzo de 2007: libro de resúmenes, p. 17
Fuente: https://acceda.ulpgc.es
Introducción
SURFACE-DEPTH AND COASTAL-OCEAN GRADIENTS IN DIVERSITY
AND ACTIVITY OF PROKARYOTES IN THE CANARY CTZ REGION
Federico Baltar1, Javier Arístegui1, Gerhard J.
Herndl2, Josep M.
Gasol3, Santiago
Hernández-León1
1 Facultad
de Ciencias del Mar, Universidad de Las Palmas de Gran Canaria
Netherlands Institute for Sea Research (NIOZ), Texel, The Netherlands
3 Institut de Ciències del Mar – (CSIC), Barcelona
2 Royal
Prokaryotes are an important component of the marine plankton playing a key role in
mediating a range of biogeochemical cycles in the ocean.
However, very few studies have
addressed their patterns of distribution, or the relative importance of bulk and groupspecific
prokaryotic activity in the dark ocean.
Here we report results of the differential
distribution in the water column of the major prokaryotic groups, including Archaea and
Bacteria (Crenarchaeota, Euryarchaeota, SAR 11, Roseobacter, Gammaproteobacteria and
Cytophaga-Flavobacterium), along a transect stretching from the eutrophic waters of the
NW Africa upwelling to the oligotrophic waters of the Canary Coastal Transition Zone
(CTZ) region.
We used the catalyzed reported deposition FISH (CARD-FISH) technique,
together with measurements of leucine incorporation, to look at coastal-ocean and surfacedepth
patterns of distribution in the abundance and metabolism of Bacteria and Archaea,
related to the hydrography and presence of distinct water masses in this heterogeneous
region.
From surface to depth a marked substitution between SAR11 (ranging from 42% to
4% in the Deep Chlorophyll Maximum (DCM) and 2000 m depth respectively) and
Crenarchaeota (ranging from 1% to 39% in the DCM and Oxygen Minimum (OM)
respectively) was observed.
A clear influence of the different intermediate water masses
was also observed in the prokaryotic bulk heterotrophic activity, with lower values at the
stations where Antarctic Intermediate Water was detected.
Crenarchaeota and
gammaproteobacteria increased in abundance in ...