Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis
A meta-analysis of photosynthesis–irradiance measurements was completed using data from the Ross Sea, Antarctica, using a total of 417 independent measurements. PmB, the maximum, chlorophyll-specific, irradiance-saturated rate of photosynthesis, averaged 1.1 ± 0.06 μg C (μg Chl)−1 h−1. Light-limited...
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Copernicus Publications
2015
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00016273 2023-05-15T13:41:02+02:00 Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis Smith Jr., W. O. Donaldson, K. 2015-06 electronic https://doi.org/10.5194/bg-12-3567-2015 https://noa.gwlb.de/receive/cop_mods_00016273 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016228/bg-12-3567-2015.pdf https://bg.copernicus.org/articles/12/3567/2015/bg-12-3567-2015.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-12-3567-2015 https://noa.gwlb.de/receive/cop_mods_00016273 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016228/bg-12-3567-2015.pdf https://bg.copernicus.org/articles/12/3567/2015/bg-12-3567-2015.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2015 ftnonlinearchiv https://doi.org/10.5194/bg-12-3567-2015 2022-02-08T22:54:15Z A meta-analysis of photosynthesis–irradiance measurements was completed using data from the Ross Sea, Antarctica, using a total of 417 independent measurements. PmB, the maximum, chlorophyll-specific, irradiance-saturated rate of photosynthesis, averaged 1.1 ± 0.06 μg C (μg Chl)−1 h−1. Light-limited, chlorophyll-specific photosynthetic rates (αB) averaged 0.030 ± 0.023 μg C (μg Chl)−1 h−1 (μmol quanta m−2 s−1)−1. Significant variations in PmB and αB were found as a function of season, with spring maximum photosynthetic rates being 60% greater than those in summer. Similarly, α values were 48% greater in spring. There was no detectable effect of sampling location on the photo-synthetic parameters, and temperature and macronutrient (NO3) concentrations also did not have an influence. However, irradiance and carbon dioxide concentrations, when altered under controlled conditions, exerted significant influences on photosynthetic parameters. Specifically, reduced irradiance resulted in significantly decreased PmB and increased αB values, and increased CO2 concentrations resulted in significantly increased PmB and αB values. Comparison of photosynthetic parameters derived at stations where iron concentrations were above and below 0.1 nM indicated that reduced iron levels were associated with significantly increased PmB values, confirming the importance of iron within the photosynthetic process. No significant difference was detected between stations dominated by diatoms and those dominated by the haptophyte Phaeocystis antarctica. The meta-analysis confirms the photosynthetic rates predicted from global analyses that are based solely on temperature and irradiance availability, but suggests that, for more accurate predictions of productivity in polar systems, a more detailed model that includes temporal effects of photosynthetic parameters will be required. Article in Journal/Newspaper Antarc* Antarctica Ross Sea Niedersächsisches Online-Archiv NOA Ross Sea Biogeosciences 12 11 3567 3577 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Smith Jr., W. O. Donaldson, K. Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis |
topic_facet |
article Verlagsveröffentlichung |
description |
A meta-analysis of photosynthesis–irradiance measurements was completed using data from the Ross Sea, Antarctica, using a total of 417 independent measurements. PmB, the maximum, chlorophyll-specific, irradiance-saturated rate of photosynthesis, averaged 1.1 ± 0.06 μg C (μg Chl)−1 h−1. Light-limited, chlorophyll-specific photosynthetic rates (αB) averaged 0.030 ± 0.023 μg C (μg Chl)−1 h−1 (μmol quanta m−2 s−1)−1. Significant variations in PmB and αB were found as a function of season, with spring maximum photosynthetic rates being 60% greater than those in summer. Similarly, α values were 48% greater in spring. There was no detectable effect of sampling location on the photo-synthetic parameters, and temperature and macronutrient (NO3) concentrations also did not have an influence. However, irradiance and carbon dioxide concentrations, when altered under controlled conditions, exerted significant influences on photosynthetic parameters. Specifically, reduced irradiance resulted in significantly decreased PmB and increased αB values, and increased CO2 concentrations resulted in significantly increased PmB and αB values. Comparison of photosynthetic parameters derived at stations where iron concentrations were above and below 0.1 nM indicated that reduced iron levels were associated with significantly increased PmB values, confirming the importance of iron within the photosynthetic process. No significant difference was detected between stations dominated by diatoms and those dominated by the haptophyte Phaeocystis antarctica. The meta-analysis confirms the photosynthetic rates predicted from global analyses that are based solely on temperature and irradiance availability, but suggests that, for more accurate predictions of productivity in polar systems, a more detailed model that includes temporal effects of photosynthetic parameters will be required. |
format |
Article in Journal/Newspaper |
author |
Smith Jr., W. O. Donaldson, K. |
author_facet |
Smith Jr., W. O. Donaldson, K. |
author_sort |
Smith Jr., W. O. |
title |
Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis |
title_short |
Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis |
title_full |
Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis |
title_fullStr |
Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis |
title_full_unstemmed |
Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis |
title_sort |
photosynthesis–irradiance responses in the ross sea, antarctica: a meta-analysis |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-3567-2015 https://noa.gwlb.de/receive/cop_mods_00016273 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016228/bg-12-3567-2015.pdf https://bg.copernicus.org/articles/12/3567/2015/bg-12-3567-2015.pdf |
geographic |
Ross Sea |
geographic_facet |
Ross Sea |
genre |
Antarc* Antarctica Ross Sea |
genre_facet |
Antarc* Antarctica Ross Sea |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-12-3567-2015 https://noa.gwlb.de/receive/cop_mods_00016273 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016228/bg-12-3567-2015.pdf https://bg.copernicus.org/articles/12/3567/2015/bg-12-3567-2015.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-12-3567-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
11 |
container_start_page |
3567 |
op_container_end_page |
3577 |
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1766144989277978624 |