Document Detail

Biomass production and assimilation of dissolved organic matter by SAR11 bacteria in the Northwest Atlantic Ocean.
MedLine Citation:
PMID:  15932993     Owner:  NLM     Status:  MEDLINE    
Members of the SAR11 clade often dominate the composition of marine microbial communities, yet their contribution to biomass production and the flux of dissolved organic matter (DOM) is unclear. In addition, little is known about the specific components of the DOM pool utilized by SAR11 bacteria. To better understand the role of SAR11 bacteria in the flux of DOM, we examined the assimilation of leucine (a measure of biomass production), as well as free amino acids, protein, and glucose, by SAR11 bacteria in the Northwest Atlantic Ocean. We found that when SAR11 bacteria were >25% of total prokaryotes, they accounted for about 30 to 50% of leucine incorporation, suggesting that SAR11 bacteria were major contributors to bacterial biomass production and the DOM flux. Specific growth rates of SAR11 bacteria either equaled or exceeded growth rates for the total prokaryotic community. In addition, SAR11 bacteria were typically responsible for a greater portion of amino acid assimilation (34 to 61%) and glucose assimilation (45 to 57%) than of protein assimilation (< or = 34%). These data suggest that SAR11 bacteria do not utilize various components of the DOM pool equally and may be more important to the flux of low-molecular-weight monomers than to that of high-molecular-weight polymers.
Rex R Malmstrom; Matthew T Cottrell; Hila Elifantz; David L Kirchman
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  71     ISSN:  0099-2240     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-06-03     Completed Date:  2005-08-11     Revised Date:  2010-09-21    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2979-86     Citation Subset:  IM    
College of Marine Studies, University of Delaware, Lewes, Deleware 19958, USA.
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MeSH Terms
Alphaproteobacteria / classification,  genetics,  metabolism*
Amino Acids / metabolism
Glucose / metabolism
In Situ Hybridization, Fluorescence
Organic Chemicals / metabolism*
Seawater / microbiology*
Reg. No./Substance:
0/Amino Acids; 0/Organic Chemicals; 50-99-7/Glucose

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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