Microbial Biomass and Activity Distribution in an Anoxic, Hypersaline Basin
The Orca Basin is a hypersaline depression in the northern Gulf of Mexico with anoxic conditions observed in the lower 200 m of the water column. Measurements of adenosine 5′-triphosphate, heterotrophic potential, and uridine uptake made above and across the interface into the anoxic zone revealed t...
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American Society for Microbiology
1979
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Online Access: | http://dx.doi.org/10.1128/aem.37.3.466-470.1979 https://journals.asm.org/doi/pdf/10.1128/aem.37.3.466-470.1979 |
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crasmicro:10.1128/aem.37.3.466-470.1979 2024-09-15T18:28:56+00:00 Microbial Biomass and Activity Distribution in an Anoxic, Hypersaline Basin LaRock, Paul A. Lauer, Ray D. Schwarz, John R. Watanabe, Kathleen K. Wiesenburg, Denis A. 1979 http://dx.doi.org/10.1128/aem.37.3.466-470.1979 https://journals.asm.org/doi/pdf/10.1128/aem.37.3.466-470.1979 en eng American Society for Microbiology https://journals.asm.org/non-commercial-tdm-license Applied and Environmental Microbiology volume 37, issue 3, page 466-470 ISSN 0099-2240 1098-5336 journal-article 1979 crasmicro https://doi.org/10.1128/aem.37.3.466-470.1979 2024-08-26T04:06:32Z The Orca Basin is a hypersaline depression in the northern Gulf of Mexico with anoxic conditions observed in the lower 200 m of the water column. Measurements of adenosine 5′-triphosphate, heterotrophic potential, and uridine uptake made above and across the interface into the anoxic zone revealed the presence of an active microbial population approximately 100 m above the interface. Biomass and activity decreased at and just below the interface but increased near the bottom, consistent with similar observations made in the Cariaco Trench. The maximum adenosine 5′-triphosphate concentration above the interface of 5.9 ng/liter (2,173 m) is about eight times greater than the value found in oxygenated waters of corresponding depth in the absence of an anoxic zone. The maximum adenosine 5′-triphosphate concentration in the anoxic zone is approximately 15 times greater than that found in oxygenated water of similar depth, suggesting anoxia will support the development of a larger bacterial population. Our findings suggest that autotrophic bacteria may be the dominant physiological group in the region just above the interface. Article in Journal/Newspaper Orca ASM Journals (American Society for Microbiology) Applied and Environmental Microbiology 37 3 466 470 |
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Open Polar |
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ASM Journals (American Society for Microbiology) |
op_collection_id |
crasmicro |
language |
English |
description |
The Orca Basin is a hypersaline depression in the northern Gulf of Mexico with anoxic conditions observed in the lower 200 m of the water column. Measurements of adenosine 5′-triphosphate, heterotrophic potential, and uridine uptake made above and across the interface into the anoxic zone revealed the presence of an active microbial population approximately 100 m above the interface. Biomass and activity decreased at and just below the interface but increased near the bottom, consistent with similar observations made in the Cariaco Trench. The maximum adenosine 5′-triphosphate concentration above the interface of 5.9 ng/liter (2,173 m) is about eight times greater than the value found in oxygenated waters of corresponding depth in the absence of an anoxic zone. The maximum adenosine 5′-triphosphate concentration in the anoxic zone is approximately 15 times greater than that found in oxygenated water of similar depth, suggesting anoxia will support the development of a larger bacterial population. Our findings suggest that autotrophic bacteria may be the dominant physiological group in the region just above the interface. |
format |
Article in Journal/Newspaper |
author |
LaRock, Paul A. Lauer, Ray D. Schwarz, John R. Watanabe, Kathleen K. Wiesenburg, Denis A. |
spellingShingle |
LaRock, Paul A. Lauer, Ray D. Schwarz, John R. Watanabe, Kathleen K. Wiesenburg, Denis A. Microbial Biomass and Activity Distribution in an Anoxic, Hypersaline Basin |
author_facet |
LaRock, Paul A. Lauer, Ray D. Schwarz, John R. Watanabe, Kathleen K. Wiesenburg, Denis A. |
author_sort |
LaRock, Paul A. |
title |
Microbial Biomass and Activity Distribution in an Anoxic, Hypersaline Basin |
title_short |
Microbial Biomass and Activity Distribution in an Anoxic, Hypersaline Basin |
title_full |
Microbial Biomass and Activity Distribution in an Anoxic, Hypersaline Basin |
title_fullStr |
Microbial Biomass and Activity Distribution in an Anoxic, Hypersaline Basin |
title_full_unstemmed |
Microbial Biomass and Activity Distribution in an Anoxic, Hypersaline Basin |
title_sort |
microbial biomass and activity distribution in an anoxic, hypersaline basin |
publisher |
American Society for Microbiology |
publishDate |
1979 |
url |
http://dx.doi.org/10.1128/aem.37.3.466-470.1979 https://journals.asm.org/doi/pdf/10.1128/aem.37.3.466-470.1979 |
genre |
Orca |
genre_facet |
Orca |
op_source |
Applied and Environmental Microbiology volume 37, issue 3, page 466-470 ISSN 0099-2240 1098-5336 |
op_rights |
https://journals.asm.org/non-commercial-tdm-license |
op_doi |
https://doi.org/10.1128/aem.37.3.466-470.1979 |
container_title |
Applied and Environmental Microbiology |
container_volume |
37 |
container_issue |
3 |
container_start_page |
466 |
op_container_end_page |
470 |
_version_ |
1810470365329096704 |