Contribution of SAR11 bacteria to dissolved dimethylsulfoniopropionate and amino acid uptake in the North Atlantic ocean

Applied and Environmental Microbiology
Rex R MalmstromDavid L Kirchman

Abstract

SAR11 bacteria are abundant in marine environments, often accounting for 35% of total prokaryotes in the surface ocean, but little is known about their involvement in marine biogeochemical cycles. Previous studies reported that SAR11 bacteria are very small and potentially have few ribosomes, indicating that SAR11 bacteria could have low metabolic activities and could play a smaller role in the flux of dissolved organic matter than suggested by their abundance. To determine the ecological activity of SAR11 bacteria, we used a combination of microautoradiography and fluorescence in situ hybridization (Micro-FISH) to measure assimilation of (3)H-amino acids and [(35)S]dimethylsulfoniopropionate (DMSP) by SAR11 bacteria in the coastal North Atlantic Ocean and the Sargasso Sea. We found that SAR11 bacteria were often abundant in surface waters, accounting for 25% of all prokaryotes on average. SAR11 bacteria were typically as large as, if not larger than, other prokaryotes. Additionally, more than half of SAR11 bacteria assimilated dissolved amino acids and DMSP, whereas about 40% of other prokaryotes assimilated these compounds. Due to their high abundance and activity, SAR11 bacteria were responsible for about 50% of amino acid a...Continue Reading

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Citations

Sep 3, 2011·Microbial Ecology·Mélissa LaghdassIngrid Obernosterer
Sep 17, 2013·Environmental Science & Technology·Muhammad Tariq KhanJean Philippe Croue
May 22, 2009·The ISME Journal·Timothy J WilliamsRicardo Cavicchioli
May 14, 2010·The ISME Journal·Rex R MalmstromSallie W Chisholm
Sep 16, 2005·Nature·Stephen J Giovannoni, Ulrich Stingl
Sep 15, 2007·Nature Reviews. Microbiology·Curtis A Suttle
Jun 16, 2012·Proceedings of the National Academy of Sciences of the United States of America·Lu FanTorsten Thomas
Apr 21, 2009·Applied and Environmental Microbiology·Tiffany R A StrazaDavid L Kirchman
May 13, 2008·Applied and Environmental Microbiology·Sarah M SowellStephen J Giovannoni
Oct 10, 2006·Applied and Environmental Microbiology·Alexander Eiler
Oct 16, 2012·Applied and Environmental Microbiology·Stefan ThieleRudolf Amann
Aug 30, 2011·Applied and Environmental Microbiology·Nianzhi Jiao, Qiang Zheng
Jan 31, 2012·Applied and Environmental Microbiology·Mrinalini P NikradD L Kirchman
Feb 14, 2012·Applied and Environmental Microbiology·Vanessa A VaraljayMary Ann Moran
Dec 8, 2005·Applied and Environmental Microbiology·Hila ElifantzDavid L Kirchman
Jun 4, 2005·Applied and Environmental Microbiology·Rex R MalmstromDavid L Kirchman
Sep 9, 2005·Microbiology and Molecular Biology Reviews : MMBR·Jakob Pernthaler, Rudolf Amann
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Jun 16, 2012·Environmental Microbiology·Laura Gómez-ConsarnauJarone Pinhassi

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