Biomass Production and Assimilation of Dissolved Organic Matter by SAR11 Bacteria in the Northwest Atlantic Ocean
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...
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ftpubmed:oai:pubmedcentral.nih.gov:1151852 2023-05-15T17:45:32+02:00 Biomass Production and Assimilation of Dissolved Organic Matter by SAR11 Bacteria in the Northwest Atlantic Ocean Malmstrom, Rex R. Cottrell, Matthew T. Elifantz, Hila Kirchman, David L. 2005-06 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1151852 http://www.ncbi.nlm.nih.gov/pubmed/15932993 https://doi.org/10.1128/AEM.71.6.2979-2986.2005 en eng American Society for Microbiology http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1151852 http://www.ncbi.nlm.nih.gov/pubmed/15932993 http://dx.doi.org/10.1128/AEM.71.6.2979-2986.2005 Copyright © 2005, American Society for Microbiology Microbial Ecology Text 2005 ftpubmed https://doi.org/10.1128/AEM.71.6.2979-2986.2005 2013-08-30T10:47:34Z 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 (≤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. Text Northwest Atlantic PubMed Central (PMC) Applied and Environmental Microbiology 71 6 2979 2986 |
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English |
topic |
Microbial Ecology |
spellingShingle |
Microbial Ecology Malmstrom, Rex R. Cottrell, Matthew T. Elifantz, Hila Kirchman, David L. Biomass Production and Assimilation of Dissolved Organic Matter by SAR11 Bacteria in the Northwest Atlantic Ocean |
topic_facet |
Microbial Ecology |
description |
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 (≤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. |
format |
Text |
author |
Malmstrom, Rex R. Cottrell, Matthew T. Elifantz, Hila Kirchman, David L. |
author_facet |
Malmstrom, Rex R. Cottrell, Matthew T. Elifantz, Hila Kirchman, David L. |
author_sort |
Malmstrom, Rex R. |
title |
Biomass Production and Assimilation of Dissolved Organic Matter by SAR11 Bacteria in the Northwest Atlantic Ocean |
title_short |
Biomass Production and Assimilation of Dissolved Organic Matter by SAR11 Bacteria in the Northwest Atlantic Ocean |
title_full |
Biomass Production and Assimilation of Dissolved Organic Matter by SAR11 Bacteria in the Northwest Atlantic Ocean |
title_fullStr |
Biomass Production and Assimilation of Dissolved Organic Matter by SAR11 Bacteria in the Northwest Atlantic Ocean |
title_full_unstemmed |
Biomass Production and Assimilation of Dissolved Organic Matter by SAR11 Bacteria in the Northwest Atlantic Ocean |
title_sort |
biomass production and assimilation of dissolved organic matter by sar11 bacteria in the northwest atlantic ocean |
publisher |
American Society for Microbiology |
publishDate |
2005 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1151852 http://www.ncbi.nlm.nih.gov/pubmed/15932993 https://doi.org/10.1128/AEM.71.6.2979-2986.2005 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1151852 http://www.ncbi.nlm.nih.gov/pubmed/15932993 http://dx.doi.org/10.1128/AEM.71.6.2979-2986.2005 |
op_rights |
Copyright © 2005, American Society for Microbiology |
op_doi |
https://doi.org/10.1128/AEM.71.6.2979-2986.2005 |
container_title |
Applied and Environmental Microbiology |
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71 |
container_issue |
6 |
container_start_page |
2979 |
op_container_end_page |
2986 |
_version_ |
1766148609152122880 |