Diffusive boundary layers, photosynthesis, and respiration of the colony-forming plankton algae, Phaeocystis sp.
Diffusive boundary layers, photosynthesis, and respiration in Phaeocystis colonies were studied by the use of microelectrodes for oxygen and pH during a bloom in the Barents Sea, 1993, and in the Marsdiep, Dutch North Sea, 1994. The oxygen microenvironment of a Phaeocystis colony with a mean diamete...
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Language: | English |
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ftpubman:oai:pure.mpg.de:item_3154120 2023-08-27T04:08:41+02:00 Diffusive boundary layers, photosynthesis, and respiration of the colony-forming plankton algae, Phaeocystis sp. Ploug, H. Stolte, W. Epping, E. Jørgensen, B. 1999 application/pdf http://hdl.handle.net/21.11116/0000-0005-4935-E http://hdl.handle.net/21.11116/0000-0005-4937-C eng eng info:eu-repo/semantics/altIdentifier/doi/10.4319/lo.1999.44.8.1949 http://hdl.handle.net/21.11116/0000-0005-4935-E http://hdl.handle.net/21.11116/0000-0005-4937-C Limnology and Oceanography info:eu-repo/semantics/article 1999 ftpubman https://doi.org/10.4319/lo.1999.44.8.1949 2023-08-02T00:10:07Z Diffusive boundary layers, photosynthesis, and respiration in Phaeocystis colonies were studied by the use of microelectrodes for oxygen and pH during a bloom in the Barents Sea, 1993, and in the Marsdiep, Dutch North Sea, 1994. The oxygen microenvironment of a Phaeocystis colony with a mean diameter of 1.4 mm was mapped from 346 O-2 measurements and showed gradients of oxygen concentration in the water phase up to 1 mm distance from the colony surface. The effective diffusive boundary layer was 0.4-0.9 mm thick. Oxygen concentrations inside colonies reached 180% of the bulk water, and pH increased up to 0.4 units when measured in light at saturating intensities (>90 mu mol photons m(-2) s(-1)). The respiration in the dark was low, resulting in a 6% lowering in oxygen concentration and 0.04 units lowering in pH inside colonies, compared to the bulk water phase. Such colonies were net heterotrophic communities at light intensities up to 10 mu mol photons m(-2) s(-1). A week later, colonies were net heterotrophic at light intensities up to 80 mu mol photons m(-2) s(-1). The effective diffusion coefficient for oxygen in the gelatinous colonies was not significantly different from that in sea water. Article in Journal/Newspaper Barents Sea Max Planck Society: MPG.PuRe Barents Sea Limnology and Oceanography 44 8 1949 1958 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
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ftpubman |
language |
English |
description |
Diffusive boundary layers, photosynthesis, and respiration in Phaeocystis colonies were studied by the use of microelectrodes for oxygen and pH during a bloom in the Barents Sea, 1993, and in the Marsdiep, Dutch North Sea, 1994. The oxygen microenvironment of a Phaeocystis colony with a mean diameter of 1.4 mm was mapped from 346 O-2 measurements and showed gradients of oxygen concentration in the water phase up to 1 mm distance from the colony surface. The effective diffusive boundary layer was 0.4-0.9 mm thick. Oxygen concentrations inside colonies reached 180% of the bulk water, and pH increased up to 0.4 units when measured in light at saturating intensities (>90 mu mol photons m(-2) s(-1)). The respiration in the dark was low, resulting in a 6% lowering in oxygen concentration and 0.04 units lowering in pH inside colonies, compared to the bulk water phase. Such colonies were net heterotrophic communities at light intensities up to 10 mu mol photons m(-2) s(-1). A week later, colonies were net heterotrophic at light intensities up to 80 mu mol photons m(-2) s(-1). The effective diffusion coefficient for oxygen in the gelatinous colonies was not significantly different from that in sea water. |
format |
Article in Journal/Newspaper |
author |
Ploug, H. Stolte, W. Epping, E. Jørgensen, B. |
spellingShingle |
Ploug, H. Stolte, W. Epping, E. Jørgensen, B. Diffusive boundary layers, photosynthesis, and respiration of the colony-forming plankton algae, Phaeocystis sp. |
author_facet |
Ploug, H. Stolte, W. Epping, E. Jørgensen, B. |
author_sort |
Ploug, H. |
title |
Diffusive boundary layers, photosynthesis, and respiration of the colony-forming plankton algae, Phaeocystis sp. |
title_short |
Diffusive boundary layers, photosynthesis, and respiration of the colony-forming plankton algae, Phaeocystis sp. |
title_full |
Diffusive boundary layers, photosynthesis, and respiration of the colony-forming plankton algae, Phaeocystis sp. |
title_fullStr |
Diffusive boundary layers, photosynthesis, and respiration of the colony-forming plankton algae, Phaeocystis sp. |
title_full_unstemmed |
Diffusive boundary layers, photosynthesis, and respiration of the colony-forming plankton algae, Phaeocystis sp. |
title_sort |
diffusive boundary layers, photosynthesis, and respiration of the colony-forming plankton algae, phaeocystis sp. |
publishDate |
1999 |
url |
http://hdl.handle.net/21.11116/0000-0005-4935-E http://hdl.handle.net/21.11116/0000-0005-4937-C |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
Limnology and Oceanography |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.4319/lo.1999.44.8.1949 http://hdl.handle.net/21.11116/0000-0005-4935-E http://hdl.handle.net/21.11116/0000-0005-4937-C |
op_doi |
https://doi.org/10.4319/lo.1999.44.8.1949 |
container_title |
Limnology and Oceanography |
container_volume |
44 |
container_issue |
8 |
container_start_page |
1949 |
op_container_end_page |
1958 |
_version_ |
1775349542917505024 |