Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean
We examined the light absorption properties and light-dependent rates of photosynthetic electron transport (ETRRCII) and 14C-uptake in phytoplankton of the Canadian Subarctic and Arctic Ocean. Our results reveal high variability in the light-saturated, chlorophyll a-specific rate of 14C-uptake (PChl...
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AMER SOC LIMNOLOGY OCEANOGRAPHY
2017
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ftawi:oai:epic.awi.de:44859 2024-09-15T17:51:22+00:00 Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean Schuback, Nina Hoppe, Clara Tremblay, J E Maldonado, M T Tortell, P D 2017-03-02 https://epic.awi.de/id/eprint/44859/ https://hdl.handle.net/10013/epic.51094 unknown AMER SOC LIMNOLOGY OCEANOGRAPHY Schuback, N. , Hoppe, C. orcid:0000-0002-2509-0546 , Tremblay, J. E. , Maldonado, M. T. and Tortell, P. D. (2017) Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean , Limnology and Oceanography, 62 (3), pp. 898-921 . doi:10.1002/lno.10475 <https://doi.org/10.1002/lno.10475> , hdl:10013/epic.51094 EPIC3Limnology and Oceanography, AMER SOC LIMNOLOGY OCEANOGRAPHY, 62(3), pp. 898-921, ISSN: 0024-3590 Article isiRev 2017 ftawi https://doi.org/10.1002/lno.10475 2024-06-24T04:17:43Z We examined the light absorption properties and light-dependent rates of photosynthetic electron transport (ETRRCII) and 14C-uptake in phytoplankton of the Canadian Subarctic and Arctic Ocean. Our results reveal high variability in the light-saturated, chlorophyll a-specific rate of 14C-uptake (PChlamax; 0.7 to 8.0 mg C mg chl a−1 h−1) , and the light-dependant efficiency of 14C-uptake (αChla; 0.01 to 0.09 mg C mg Chl a−1 h−1 [μmol quanta m−2 s−1]−1). Variability in PChlamax correlated with light availability in the stratified water-column, while both PChlamax and αChla were correlated to the degree of nitrate depletion in the mixed layer. For all samples, we observed that 14C-uptake rates reached light saturation at lower irradiances than ETRRCII, leading to significant, light-dependent de-coupling of carbon fixation and photosynthetic electron transport. For samples taken from within the mixed layer, we found that the conversion factor from ETRRCII to carbon fixation was strongly correlated to the magnitude of non-photochemical quenching, as derived from fast repetition rate fluorometry (FRRF) measurements. This correlation supports recent findings from the Subarctic Pacific Ocean, and has the potential to improve FRRF-based estimates of phytoplankton carbon fixation. Our observations reveal distinct environmental regulation of phytoplankton light absorption, electron transport and carbon fixation in phytoplankton assemblages within and below the shallow summer mixed layer, and will help to inform more robust predictions of future primary production in a rapidly changing Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Ocean Phytoplankton Subarctic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Limnology and Oceanography 62 3 898 921 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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We examined the light absorption properties and light-dependent rates of photosynthetic electron transport (ETRRCII) and 14C-uptake in phytoplankton of the Canadian Subarctic and Arctic Ocean. Our results reveal high variability in the light-saturated, chlorophyll a-specific rate of 14C-uptake (PChlamax; 0.7 to 8.0 mg C mg chl a−1 h−1) , and the light-dependant efficiency of 14C-uptake (αChla; 0.01 to 0.09 mg C mg Chl a−1 h−1 [μmol quanta m−2 s−1]−1). Variability in PChlamax correlated with light availability in the stratified water-column, while both PChlamax and αChla were correlated to the degree of nitrate depletion in the mixed layer. For all samples, we observed that 14C-uptake rates reached light saturation at lower irradiances than ETRRCII, leading to significant, light-dependent de-coupling of carbon fixation and photosynthetic electron transport. For samples taken from within the mixed layer, we found that the conversion factor from ETRRCII to carbon fixation was strongly correlated to the magnitude of non-photochemical quenching, as derived from fast repetition rate fluorometry (FRRF) measurements. This correlation supports recent findings from the Subarctic Pacific Ocean, and has the potential to improve FRRF-based estimates of phytoplankton carbon fixation. Our observations reveal distinct environmental regulation of phytoplankton light absorption, electron transport and carbon fixation in phytoplankton assemblages within and below the shallow summer mixed layer, and will help to inform more robust predictions of future primary production in a rapidly changing Arctic Ocean. |
format |
Article in Journal/Newspaper |
author |
Schuback, Nina Hoppe, Clara Tremblay, J E Maldonado, M T Tortell, P D |
spellingShingle |
Schuback, Nina Hoppe, Clara Tremblay, J E Maldonado, M T Tortell, P D Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean |
author_facet |
Schuback, Nina Hoppe, Clara Tremblay, J E Maldonado, M T Tortell, P D |
author_sort |
Schuback, Nina |
title |
Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean |
title_short |
Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean |
title_full |
Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean |
title_fullStr |
Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean |
title_full_unstemmed |
Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean |
title_sort |
primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the arctic ocean |
publisher |
AMER SOC LIMNOLOGY OCEANOGRAPHY |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/44859/ https://hdl.handle.net/10013/epic.51094 |
genre |
Arctic Arctic Ocean Phytoplankton Subarctic |
genre_facet |
Arctic Arctic Ocean Phytoplankton Subarctic |
op_source |
EPIC3Limnology and Oceanography, AMER SOC LIMNOLOGY OCEANOGRAPHY, 62(3), pp. 898-921, ISSN: 0024-3590 |
op_relation |
Schuback, N. , Hoppe, C. orcid:0000-0002-2509-0546 , Tremblay, J. E. , Maldonado, M. T. and Tortell, P. D. (2017) Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean , Limnology and Oceanography, 62 (3), pp. 898-921 . doi:10.1002/lno.10475 <https://doi.org/10.1002/lno.10475> , hdl:10013/epic.51094 |
op_doi |
https://doi.org/10.1002/lno.10475 |
container_title |
Limnology and Oceanography |
container_volume |
62 |
container_issue |
3 |
container_start_page |
898 |
op_container_end_page |
921 |
_version_ |
1810293247374786560 |