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- W2158331282 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 39:7-16 (2005) - doi:10.3354/ame039007 Seasonal dynamics of bacterial growth efficiencies in relation to phytoplankton in the southern North Sea Thomas Reinthaler*, Gerhard J. Herndl Department of Biological Oceanography, Royal Netherlands Institute for Sea Research (NIOZ), PO Box 59, 1790 AB Den Burg, Texel, The Netherlands *Email: thomas.reinthaler@nioz.nl ABSTRACT: The main function of heterotrophic bacterioplankton in marine carbon cycling is the conversion of dissolved organic carbon (DOC) into biomass and CO2. The relative importance of bacterial biomass production (BP) versus respiration (BR) is expressed by the bacterial growth efficiency (BGE = BP/(BP + BR) × 100). Studies on the dynamics of the BGE of bacterioplankton growing on natural DOC covering entire seasonal cycles are scarce. We measured BP and BR over a seasonal cycle in the southern North Sea at a total of 150 stations to determine seasonal variability in BGE. While BP varied over 1 order of magnitude over the seasonal cycle, BR varied only 2-fold. Cell-specific BP was related to primary production while BR was not. Mean BGE increased from 6 ± 3% in the winter to 25 ± 9% in the spring and summer. Depth-integrated BR was fairly stable over the seasonal cycle, averaging 57% of the particulate primary production. Based on the bacterioplankton respiration and the mean annual BGE of 20%, bacterioplankton organic carbon demand amounts to ~70% of the particulate primary production in the southern North Sea, suggesting that autochthonous organic matter production is sufficient to fuel bacterioplankton carbon demand. KEY WORDS: Bacterioplankton · Bacterial production · Bacterial respiration · Bacterial growth efficiency · Primary production · North Sea Full article in pdf format NextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 39, No. 1. Online publication date: April 28, 2005 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2005 Inter-Research." @default.
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- W2158331282 date "2005-01-01" @default.
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- W2158331282 title "Seasonal dynamics of bacterial growth efficiencies in relation to phytoplankton in the southern North Sea" @default.
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