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°S and 55°S al...
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ftpubmed:oai:pubmedcentral.nih.gov:91849 2023-05-15T18:24:30+02:00 Limitation of Bacterial Growth by Dissolved Organic Matter and Iron in the Southern Ocean† Church, Matthew J. Hutchins, David A. Ducklow, Hugh W. 2000-02 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC91849 http://www.ncbi.nlm.nih.gov/pubmed/10653704 en eng American Society for Microbiology http://www.ncbi.nlm.nih.gov/pmc/articles/PMC91849 http://www.ncbi.nlm.nih.gov/pubmed/10653704 Copyright © 2000, American Society for Microbiology Microbial Ecology Text 2000 ftpubmed 2013-08-29T09:19:54Z 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°S and 55°S along 141°E. Bacterial abundance, mean cell volume, and [3H]thymidine and [3H]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 Southern Ocean Subarctic PubMed Central (PMC) Pacific Southern Ocean |
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English |
topic |
Microbial Ecology |
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Microbial Ecology Church, Matthew J. Hutchins, David A. Ducklow, Hugh W. Limitation of Bacterial Growth by Dissolved Organic Matter and Iron in the Southern Ocean† |
topic_facet |
Microbial Ecology |
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°S and 55°S along 141°E. Bacterial abundance, mean cell volume, and [3H]thymidine and [3H]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, Matthew J. Hutchins, David A. Ducklow, Hugh W. |
author_facet |
Church, Matthew J. Hutchins, David A. Ducklow, Hugh W. |
author_sort |
Church, Matthew J. |
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 |
American Society for Microbiology |
publishDate |
2000 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC91849 http://www.ncbi.nlm.nih.gov/pubmed/10653704 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean Subarctic |
genre_facet |
Southern Ocean Subarctic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC91849 http://www.ncbi.nlm.nih.gov/pubmed/10653704 |
op_rights |
Copyright © 2000, American Society for Microbiology |
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