| Roseobacter and SAR11 dominate microbial glucose uptake in coastal North Sea waters. | |
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MedLine Citation:
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PMID: 17014500 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Bacterial assemblages in coastal pelagic environments are exposed to pronounced temporal and spatial fluctuations in the availability of monomeric substrates. Little is known about the response of particular bacterial groups to such variability. We studied glucose incorporation at various concentrations (0.1-100 nM) by bacteria related to Roseobacter, SAR11, Gammaproteobacteria and Cytophaga-Flavobacteria in coastal North Sea waters in late winter and during a spring phytoplankton bloom dominated by Phaeocystis sp. (March and May 2004 respectively). Both the fraction of glucose-assimilating bacterial cells and the rate of substrate incorporation per active cell were higher in May. The respective contributions of the studied groups to all glucose-assimilating Bacteria were related to substrate concentration. The majority of glucose-incorporating bacterial cells at the lower concentrations were members of the Roseobacter and SAR11 clades. At both time-points the two groups formed approximately equal fractions of all glucose-incorporating bacteria. This was due to a small population of highly active Roseobacter cells and high abundances of SAR11 bacteria with low proportions of glucose-incorporating cells. By contrast, the proportion of active cells from the Cytophaga-Flavobacteria lineage substantially increased at higher levels of available substrate. The determination of concentration-dependent substrate incorporation patterns may help to better understand the different ecophysiological niches of bacterioplankton populations. |
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Authors:
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Cecilia Alonso; Jakob Pernthaler |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Environmental microbiology Volume: 8 ISSN: 1462-2912 ISO Abbreviation: Environ. Microbiol. Publication Date: 2006 Nov |
Date Detail:
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Created Date: 2006-10-03 Completed Date: 2006-11-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100883692 Medline TA: Environ Microbiol Country: England |
Other Details:
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Languages: eng Pagination: 2022-30 Citation Subset: IM |
Affiliation:
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Limnological Station Kilchberg, University of Zürich, Switzerland. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Alphaproteobacteria
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metabolism* Autoradiography / methods Bacteria / metabolism Cytophaga Glucose / metabolism* In Situ Hybridization, Fluorescence North Sea Phytoplankton Roseobacter / metabolism* Seawater / microbiology* |
| Chemical | |
Reg. No./Substance:
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50-99-7/Glucose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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