E 2008, by the American Society of Limnology and Oceanography, Inc. Bacterial vs. zooplankton control of sinking particle flux in the ocean’s twilight zone
The downward flux of particulate organic carbon (POC) decreases significantly in the ocean’s mesopelagic or ‘twilight ’ zone due both to abiotic processes and metabolism by resident biota. Bacteria and zooplankton solubilize and consume POC to support their metabolism, but the relative importance of...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.297.4492 2023-05-15T18:28:32+02:00 E 2008, by the American Society of Limnology and Oceanography, Inc. Bacterial vs. zooplankton control of sinking particle flux in the ocean’s twilight zone Deborah K. Steinberg Benjamin A. S. Van Mooy Ken O. Buesseler Philip W. Boyd Toru Kobari David M. Karl The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.297.4492 http://www.aslo.org/lo/toc/vol_53/issue_4/1327.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.297.4492 http://www.aslo.org/lo/toc/vol_53/issue_4/1327.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.aslo.org/lo/toc/vol_53/issue_4/1327.pdf text ftciteseerx 2016-01-07T21:51:15Z The downward flux of particulate organic carbon (POC) decreases significantly in the ocean’s mesopelagic or ‘twilight ’ zone due both to abiotic processes and metabolism by resident biota. Bacteria and zooplankton solubilize and consume POC to support their metabolism, but the relative importance of bacteria vs. zooplankton in the consumption of sinking particles in the twilight zone is unknown. We compared losses of sinking POC, using differences in export flux measured by neutrally buoyant sediment traps at a range of depths, with bacteria and zooplankton metabolic requirements at the Hawaii Ocean Time-series station ALOHA in the subtropical Pacific and the Japanese times-series site K2 in the subarctic Pacific. Integrated (150–1,000 m) mesopelagic bacterial C demand exceeded that of zooplankton by up to 3-fold at ALOHA, while bacteria and zooplankton required relatively equal amounts of POC at K2. However, sinking POC flux was inadequate to meet metabolic demands at either site. Mesopelagic bacterial C demand was 3- to 4-fold (ALOHA), and 10-fold (K2) greater than the loss of sinking POC flux, while zooplankton C demand was 1- to 2-fold (ALOHA), and 3- to 9-fold (K2) greater (using our ‘‘middle’ ’ estimate conversion factors to calculate C demand). Assuming the particle flux estimates are accurate, we posit that this additional C demand must be met by diel vertical migration of zooplankton feeding at the surface and by carnivory at depth—with both processes ultimately supplying organic C to mesopelagic bacteria. These pathways Text Subarctic Unknown Pacific |
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description |
The downward flux of particulate organic carbon (POC) decreases significantly in the ocean’s mesopelagic or ‘twilight ’ zone due both to abiotic processes and metabolism by resident biota. Bacteria and zooplankton solubilize and consume POC to support their metabolism, but the relative importance of bacteria vs. zooplankton in the consumption of sinking particles in the twilight zone is unknown. We compared losses of sinking POC, using differences in export flux measured by neutrally buoyant sediment traps at a range of depths, with bacteria and zooplankton metabolic requirements at the Hawaii Ocean Time-series station ALOHA in the subtropical Pacific and the Japanese times-series site K2 in the subarctic Pacific. Integrated (150–1,000 m) mesopelagic bacterial C demand exceeded that of zooplankton by up to 3-fold at ALOHA, while bacteria and zooplankton required relatively equal amounts of POC at K2. However, sinking POC flux was inadequate to meet metabolic demands at either site. Mesopelagic bacterial C demand was 3- to 4-fold (ALOHA), and 10-fold (K2) greater than the loss of sinking POC flux, while zooplankton C demand was 1- to 2-fold (ALOHA), and 3- to 9-fold (K2) greater (using our ‘‘middle’ ’ estimate conversion factors to calculate C demand). Assuming the particle flux estimates are accurate, we posit that this additional C demand must be met by diel vertical migration of zooplankton feeding at the surface and by carnivory at depth—with both processes ultimately supplying organic C to mesopelagic bacteria. These pathways |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Deborah K. Steinberg Benjamin A. S. Van Mooy Ken O. Buesseler Philip W. Boyd Toru Kobari David M. Karl |
spellingShingle |
Deborah K. Steinberg Benjamin A. S. Van Mooy Ken O. Buesseler Philip W. Boyd Toru Kobari David M. Karl E 2008, by the American Society of Limnology and Oceanography, Inc. Bacterial vs. zooplankton control of sinking particle flux in the ocean’s twilight zone |
author_facet |
Deborah K. Steinberg Benjamin A. S. Van Mooy Ken O. Buesseler Philip W. Boyd Toru Kobari David M. Karl |
author_sort |
Deborah K. Steinberg |
title |
E 2008, by the American Society of Limnology and Oceanography, Inc. Bacterial vs. zooplankton control of sinking particle flux in the ocean’s twilight zone |
title_short |
E 2008, by the American Society of Limnology and Oceanography, Inc. Bacterial vs. zooplankton control of sinking particle flux in the ocean’s twilight zone |
title_full |
E 2008, by the American Society of Limnology and Oceanography, Inc. Bacterial vs. zooplankton control of sinking particle flux in the ocean’s twilight zone |
title_fullStr |
E 2008, by the American Society of Limnology and Oceanography, Inc. Bacterial vs. zooplankton control of sinking particle flux in the ocean’s twilight zone |
title_full_unstemmed |
E 2008, by the American Society of Limnology and Oceanography, Inc. Bacterial vs. zooplankton control of sinking particle flux in the ocean’s twilight zone |
title_sort |
e 2008, by the american society of limnology and oceanography, inc. bacterial vs. zooplankton control of sinking particle flux in the ocean’s twilight zone |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.297.4492 http://www.aslo.org/lo/toc/vol_53/issue_4/1327.pdf |
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Pacific |
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Pacific |
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Subarctic |
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Subarctic |
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http://www.aslo.org/lo/toc/vol_53/issue_4/1327.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.297.4492 http://www.aslo.org/lo/toc/vol_53/issue_4/1327.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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