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• W2135479747 abstract "AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 50:63-74 (2007) - DOI: https://doi.org/10.3354/ame01156 Strong coast–ocean and surface–depth gradients in prokaryotic assemblage structure and activity in a coastal transition zone region Federico Baltar1,*, Javier Arístegui1, Josep M. Gasol2, Santiago Hernández-León1, Gerhard J. Herndl3 1Facultad de Ciencias del Mar, Universidad de Las Palmas de Gran Canaria, Campus Universitario de Tafira, 35017 Las Palmas de Gran Canaria, Spain 2Departament de Biologia Marina i Oceanografia, Institut de Ciències del Mar – CSIC, Pg. Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain 3Department of Biological Oceanography, Royal Netherlands Institute for Sea Research (NIOZ), PO Box 59, 1790 AB, Den Burg, The Netherlands *Email: federico.baltar102@doctorandos.ulpgc.es ABSTRACT: The distribution of marine Crenarchaeota Group I, marine Euryarchaeota Group II and some major groups of Bacteria (SAR 11, Roseobacter, Gammaproteobacteria and Bacteroidetes) was investigated in the North Atlantic water column (surface to 2000 m depth) along a transect from the coastal waters of the NW African upwelling to the offshore waters of the Canary Coastal Transition Zone (CTZ). Catalyzed reporter deposition-fluorescence in situ hybridization (CARD-FISH) was used to describe the prokaryotic assemblages. Bulk picoplankton abundance and leucine incorporation were determined. Pronounced changes in prokaryotic assemblage composition were observed from the coast to the open ocean and at the deep chlorophyll maximum (DCM) with decreasing bulk heterotrophic activity. All bacterial groups decreased in absolute abundances from the coast to the open ocean; both archaeal groups increased towards the open ocean. Prokaryotic abundance and activity decreased 2 and 3 orders of magnitude, respectively, from the surface to 2000 m. Prokaryotic growth rates were high in the mesopelagic zone (~0.13 d–1), compared to other reports from the central North Atlantic. SAR11 in total picoplankton abundance decreased from 42% in the DCM to 4% at 2000 m, while marine Crenarchaeota Group I increased from 1% in the DCM to 39% in the oxygen minimum layer. A clear influence of the different intermediate water masses was observed on the bulk heterotrophic picoplankton activity, with lower leucine incorporation rates corresponding to layers where patches of Antarctic Intermediate Water were detected. Coast–ocean and surface–depth gradients in bulk prokaryotic abundance and production and assemblage composition were comparable to changes observed in basin-scale studies, pinpointing the CTZs as regions of strong variability in microbial diversity and metabolism. KEY WORDS: Archaea · Bacteria · Assemblage structure · Activity · Deep ocean · CARD-FISH Full text in pdf format PreviousNextCite this article as: Baltar F, Arístegui J, Gasol JM, Hernández-León S, Herndl GJ (2007) Strong coast–ocean and surface–depth gradients in prokaryotic assemblage structure and activity in a coastal transition zone region. Aquat Microb Ecol 50:63-74. https://doi.org/10.3354/ame01156 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 50, No. 1. Online publication date: December 12, 2007 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2007 Inter-Research." @default.
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• W2135479747 date "2007-12-12" @default.
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• W2135479747 title "Strong coast–ocean and surface–depth gradients in prokaryotic assemblage structure and activity in a coastal transition zone region" @default.
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• W2135479747 doi "https://doi.org/10.3354/ame01156" @default.
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