Heterotrophic bacterial production and extracellular enzymatic activity in sinking particulate matter in the western North Pacific Ocean
Heterotrophic activities on sinking particulate matter (SPM) play an important role in SPM fluxes in the ocean. To demonstrate regional differences in heterotrophic activities on SPM, we measured heterotrophic bacterial production (HBP) in seawater (HBPSW) and SPM (HBPSPM) as well as potential extra...
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ftpubmed:oai:pubmedcentral.nih.gov:3478788 2023-05-15T18:28:29+02:00 Heterotrophic bacterial production and extracellular enzymatic activity in sinking particulate matter in the western North Pacific Ocean Yamada, Namiha Fukuda, Hideki Ogawa, Hiroshi Saito, Hiroaki Suzumura, Masahiro 2012-10-23 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3478788 http://www.ncbi.nlm.nih.gov/pubmed/23109933 https://doi.org/10.3389/fmicb.2012.00379 en eng Frontiers Media S.A. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3478788 http://www.ncbi.nlm.nih.gov/pubmed/23109933 http://dx.doi.org/10.3389/fmicb.2012.00379 Copyright © Yamada, Fukuda, Ogawa, Saito and Suzumura. http://www.frontiersin.org/licenseagreement This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) , which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc. CC-BY Microbiology Text 2012 ftpubmed https://doi.org/10.3389/fmicb.2012.00379 2013-09-04T14:52:02Z Heterotrophic activities on sinking particulate matter (SPM) play an important role in SPM fluxes in the ocean. To demonstrate regional differences in heterotrophic activities on SPM, we measured heterotrophic bacterial production (HBP) in seawater (HBPSW) and SPM (HBPSPM) as well as potential extracellular enzyme activity (EEA) in SPM on a transect along 155°E in the western North Pacific Ocean in the subarctic (44°N), the Kuroshio Extension area (35°N), and the subtropical gyre (20°N). Depth-integrated HBPSW from the surface to 500 m was comparable between the locations, whereas HBPSPM at 44°N was substantially lower than at the other sites. We found the highest particulate organic carbon (POC) export flux and export efficiency to bathypelagic depths, and the lowest water temperatures, at 44°N. We found significant correlations between leucine aminopeptidase (LAPase) activity, β-glucosidase (BGase) activity, POC flux and particulate organic nitrogen flux. LAPase activity was two orders of magnitude higher than BGase activity, with a BGase:LAPase activity ratio of 0.027. There were no significant correlations between HBP and EEA in SPM except for lipase, and lipase activity was significantly correlated with temperature. We propose that hydrographic conditions are an important factor controlling heterotrophic bacterial activity and export efficiency of organic carbon to the deep ocean, as are the sources and abundance of SPM produced in the euphotic zone via primary production. Text Subarctic PubMed Central (PMC) Pacific Frontiers in Microbiology 3 |
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Microbiology |
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Microbiology Yamada, Namiha Fukuda, Hideki Ogawa, Hiroshi Saito, Hiroaki Suzumura, Masahiro Heterotrophic bacterial production and extracellular enzymatic activity in sinking particulate matter in the western North Pacific Ocean |
topic_facet |
Microbiology |
description |
Heterotrophic activities on sinking particulate matter (SPM) play an important role in SPM fluxes in the ocean. To demonstrate regional differences in heterotrophic activities on SPM, we measured heterotrophic bacterial production (HBP) in seawater (HBPSW) and SPM (HBPSPM) as well as potential extracellular enzyme activity (EEA) in SPM on a transect along 155°E in the western North Pacific Ocean in the subarctic (44°N), the Kuroshio Extension area (35°N), and the subtropical gyre (20°N). Depth-integrated HBPSW from the surface to 500 m was comparable between the locations, whereas HBPSPM at 44°N was substantially lower than at the other sites. We found the highest particulate organic carbon (POC) export flux and export efficiency to bathypelagic depths, and the lowest water temperatures, at 44°N. We found significant correlations between leucine aminopeptidase (LAPase) activity, β-glucosidase (BGase) activity, POC flux and particulate organic nitrogen flux. LAPase activity was two orders of magnitude higher than BGase activity, with a BGase:LAPase activity ratio of 0.027. There were no significant correlations between HBP and EEA in SPM except for lipase, and lipase activity was significantly correlated with temperature. We propose that hydrographic conditions are an important factor controlling heterotrophic bacterial activity and export efficiency of organic carbon to the deep ocean, as are the sources and abundance of SPM produced in the euphotic zone via primary production. |
format |
Text |
author |
Yamada, Namiha Fukuda, Hideki Ogawa, Hiroshi Saito, Hiroaki Suzumura, Masahiro |
author_facet |
Yamada, Namiha Fukuda, Hideki Ogawa, Hiroshi Saito, Hiroaki Suzumura, Masahiro |
author_sort |
Yamada, Namiha |
title |
Heterotrophic bacterial production and extracellular enzymatic activity in sinking particulate matter in the western North Pacific Ocean |
title_short |
Heterotrophic bacterial production and extracellular enzymatic activity in sinking particulate matter in the western North Pacific Ocean |
title_full |
Heterotrophic bacterial production and extracellular enzymatic activity in sinking particulate matter in the western North Pacific Ocean |
title_fullStr |
Heterotrophic bacterial production and extracellular enzymatic activity in sinking particulate matter in the western North Pacific Ocean |
title_full_unstemmed |
Heterotrophic bacterial production and extracellular enzymatic activity in sinking particulate matter in the western North Pacific Ocean |
title_sort |
heterotrophic bacterial production and extracellular enzymatic activity in sinking particulate matter in the western north pacific ocean |
publisher |
Frontiers Media S.A. |
publishDate |
2012 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3478788 http://www.ncbi.nlm.nih.gov/pubmed/23109933 https://doi.org/10.3389/fmicb.2012.00379 |
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Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3478788 http://www.ncbi.nlm.nih.gov/pubmed/23109933 http://dx.doi.org/10.3389/fmicb.2012.00379 |
op_rights |
Copyright © Yamada, Fukuda, Ogawa, Saito and Suzumura. http://www.frontiersin.org/licenseagreement This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) , which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmicb.2012.00379 |
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Frontiers in Microbiology |
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3 |
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