Limitation of bacterial growth by dissolved organic matter and iron in the Southern Ocean
The importance of resource limitation in controlling bacterial growth in the high-nutrient, low-chlorophyll (HNLC) region of the Southern Ocean was experimentally determined during February and March 1998. Organic- and inorganic-nutrient enrichment experiments were performed between 42 degrees S and...
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-2384 2023-06-11T04:09:41+02:00 Limitation of bacterial growth by dissolved organic matter and iron in the Southern Ocean Church, MJ Hutchins, DA Ducklow, HW 2000-02-01T08:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/1392 doi: 10.1128/AEM.66.2.455-466.2000 https://scholarworks.wm.edu/context/vimsarticles/article/2384/viewcontent/2000_Church_455.full.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/1392 doi: 10.1128/AEM.66.2.455-466.2000 https://scholarworks.wm.edu/context/vimsarticles/article/2384/viewcontent/2000_Church_455.full.pdf VIMS Articles Late Austral Winter Sub-Arctic Pacific Surface Waters Heterotrophic Bacterioplankton Biological Sciences Peer-Reviewed Articles Environmental Microbiology and Microbial Ecology Marine Biology text 2000 ftwilliammarycol https://doi.org/10.1128/AEM.66.2.455-466.2000 2023-05-04T17:44:32Z The importance of resource limitation in controlling bacterial growth in the high-nutrient, low-chlorophyll (HNLC) region of the Southern Ocean was experimentally determined during February and March 1998. Organic- and inorganic-nutrient enrichment experiments were performed between 42 degrees S and 55 degrees S along 141 degrees E. Bacterial abundance, mean cell volume, and [H-3]thymidine and [H-3]leucine incorporation were measured during 4- to 5-day incubations. Bacterial biomass, production, and rates of growth all responded to organic enrichments in three of the four experiments. These results indicate that bacterial growth was constrained primarily by the availability of dissolved organic matter. Bacterial growth in the subtropical front, subantarctic zone, and subantarctic front responded most favorably to additions of dissolved free amino acids or glucose plus ammonium. Bacterial growth in these regions may be limited by input of both organic matter and reduced nitrogen. Unlike similar experimental results in other HNLC regions (subarctic and equatorial Pacific), growth stimulation of bacteria in the Southern Ocean resulted in significant biomass accumulation, apparently by stimulating bacterial growth in excess of removal processes. Bacterial growth was relatively unchanged by additions of iron alone; however, additions of glucose plus iron resulted in substantial increases in rates of bacterial growth and biomass accumulation. These results imply that bacterial growth efficiency and nitrogen utilization may be partly constrained by iron availability in the HNLC Southern Ocean. Text Arctic Southern Ocean Subarctic W&M ScholarWorks Arctic Southern Ocean Austral Pacific Applied and Environmental Microbiology 66 2 455 466 |
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W&M ScholarWorks |
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ftwilliammarycol |
language |
unknown |
topic |
Late Austral Winter Sub-Arctic Pacific Surface Waters Heterotrophic Bacterioplankton Biological Sciences Peer-Reviewed Articles Environmental Microbiology and Microbial Ecology Marine Biology |
spellingShingle |
Late Austral Winter Sub-Arctic Pacific Surface Waters Heterotrophic Bacterioplankton Biological Sciences Peer-Reviewed Articles Environmental Microbiology and Microbial Ecology Marine Biology Church, MJ Hutchins, DA Ducklow, HW Limitation of bacterial growth by dissolved organic matter and iron in the Southern Ocean |
topic_facet |
Late Austral Winter Sub-Arctic Pacific Surface Waters Heterotrophic Bacterioplankton Biological Sciences Peer-Reviewed Articles Environmental Microbiology and Microbial Ecology Marine Biology |
description |
The importance of resource limitation in controlling bacterial growth in the high-nutrient, low-chlorophyll (HNLC) region of the Southern Ocean was experimentally determined during February and March 1998. Organic- and inorganic-nutrient enrichment experiments were performed between 42 degrees S and 55 degrees S along 141 degrees E. Bacterial abundance, mean cell volume, and [H-3]thymidine and [H-3]leucine incorporation were measured during 4- to 5-day incubations. Bacterial biomass, production, and rates of growth all responded to organic enrichments in three of the four experiments. These results indicate that bacterial growth was constrained primarily by the availability of dissolved organic matter. Bacterial growth in the subtropical front, subantarctic zone, and subantarctic front responded most favorably to additions of dissolved free amino acids or glucose plus ammonium. Bacterial growth in these regions may be limited by input of both organic matter and reduced nitrogen. Unlike similar experimental results in other HNLC regions (subarctic and equatorial Pacific), growth stimulation of bacteria in the Southern Ocean resulted in significant biomass accumulation, apparently by stimulating bacterial growth in excess of removal processes. Bacterial growth was relatively unchanged by additions of iron alone; however, additions of glucose plus iron resulted in substantial increases in rates of bacterial growth and biomass accumulation. These results imply that bacterial growth efficiency and nitrogen utilization may be partly constrained by iron availability in the HNLC Southern Ocean. |
format |
Text |
author |
Church, MJ Hutchins, DA Ducklow, HW |
author_facet |
Church, MJ Hutchins, DA Ducklow, HW |
author_sort |
Church, MJ |
title |
Limitation of bacterial growth by dissolved organic matter and iron in the Southern Ocean |
title_short |
Limitation of bacterial growth by dissolved organic matter and iron in the Southern Ocean |
title_full |
Limitation of bacterial growth by dissolved organic matter and iron in the Southern Ocean |
title_fullStr |
Limitation of bacterial growth by dissolved organic matter and iron in the Southern Ocean |
title_full_unstemmed |
Limitation of bacterial growth by dissolved organic matter and iron in the Southern Ocean |
title_sort |
limitation of bacterial growth by dissolved organic matter and iron in the southern ocean |
publisher |
W&M ScholarWorks |
publishDate |
2000 |
url |
https://scholarworks.wm.edu/vimsarticles/1392 https://scholarworks.wm.edu/context/vimsarticles/article/2384/viewcontent/2000_Church_455.full.pdf |
geographic |
Arctic Southern Ocean Austral Pacific |
geographic_facet |
Arctic Southern Ocean Austral Pacific |
genre |
Arctic Southern Ocean Subarctic |
genre_facet |
Arctic Southern Ocean Subarctic |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/1392 doi: 10.1128/AEM.66.2.455-466.2000 https://scholarworks.wm.edu/context/vimsarticles/article/2384/viewcontent/2000_Church_455.full.pdf |
op_doi |
https://doi.org/10.1128/AEM.66.2.455-466.2000 |
container_title |
Applied and Environmental Microbiology |
container_volume |
66 |
container_issue |
2 |
container_start_page |
455 |
op_container_end_page |
466 |
_version_ |
1768383663156756480 |