Autotrophic and heterotrophic activity in Arctic first-year sea ice:seasonal study from Malene Bight, SW Greenland
We present a study of autotrophic and heterotrophic activities of Arctic sea ice (Malene Bight, SW Greenland) as measured by 2 different approaches: (1) standard incubation techniques (H14CO3– and [3H]thymidine incubation) on sea ice cores brought to the laboratory and (2) cores incubated in situ in...
Published in: | Marine Ecology Progress Series |
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2010
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ftcopenhagenunip:oai:pure.atira.dk:publications/7d4dc6b2-a61f-48c0-b562-490f02c3eb05 2023-12-17T10:23:14+01:00 Autotrophic and heterotrophic activity in Arctic first-year sea ice:seasonal study from Malene Bight, SW Greenland Søgaard, Dorte Haubjerg Kristensen, Morten Rysgaard, Søren Glud, Ronnie Nøhr Hansen, Per Juel Hillingsøe, Karen Marie 2010 application/pdf https://curis.ku.dk/portal/da/publications/autotrophic-and-heterotrophic-activity-in-arctic-firstyear-sea-ice(7d4dc6b2-a61f-48c0-b562-490f02c3eb05).html https://doi.org/10.3354/meps08845 https://curis.ku.dk/ws/files/165175340/S_gaard_2010_Autotrophic_and_heterotrophic.pdf eng eng info:eu-repo/semantics/openAccess Søgaard , D H , Kristensen , M , Rysgaard , S , Glud , R N , Hansen , P J & Hillingsøe , K M 2010 , ' Autotrophic and heterotrophic activity in Arctic first-year sea ice : seasonal study from Malene Bight, SW Greenland ' , Marine Ecology - Progress Series , vol. 419 , pp. 31-45 . https://doi.org/10.3354/meps08845 article 2010 ftcopenhagenunip https://doi.org/10.3354/meps08845 2023-11-22T23:58:50Z We present a study of autotrophic and heterotrophic activities of Arctic sea ice (Malene Bight, SW Greenland) as measured by 2 different approaches: (1) standard incubation techniques (H14CO3– and [3H]thymidine incubation) on sea ice cores brought to the laboratory and (2) cores incubated in situ in plastic bags with subsequent melting and measurements of changes in total O2 concentrations. The standard incubations showed that the annual succession followed a distinctive pattern, with a low, almost balancing heterotrophic and autotrophic activity during February and March. This period was followed by an algal bloom in late March and April, leading to a net autotrophic community. During February and March, the oxygen level in the bag incubations remained constant, validating the low balanced heterotrophic and autotrophic activity. As the autotrophic activity exceeded the heterotrophic activity in late March and April, it resulted in a significant net oxygen accumulation in the bag incubations. Integrated over the entire season, the sea ice of Malene Bight was net autotrophic with an annual net carbon fixation of 220 mg C m– 2, reflecting the net result of a sea ice-related gross primary production of 350 mg C m– 2 and concurrent bacterial carbon demand of 130 mg C m– 2. Converting the O2 net exchange of the bag incubations into carbon turnover estimated an annual net carbon fixation of 1700 ± 760 mg C m– 2 (mean ± SD), which was higher than the annual net carbon fixation quantified in the standard incubations Article in Journal/Newspaper Arctic Arctic Greenland Sea ice University of Copenhagen: Research Arctic Greenland Marine Ecology Progress Series 419 31 45 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
We present a study of autotrophic and heterotrophic activities of Arctic sea ice (Malene Bight, SW Greenland) as measured by 2 different approaches: (1) standard incubation techniques (H14CO3– and [3H]thymidine incubation) on sea ice cores brought to the laboratory and (2) cores incubated in situ in plastic bags with subsequent melting and measurements of changes in total O2 concentrations. The standard incubations showed that the annual succession followed a distinctive pattern, with a low, almost balancing heterotrophic and autotrophic activity during February and March. This period was followed by an algal bloom in late March and April, leading to a net autotrophic community. During February and March, the oxygen level in the bag incubations remained constant, validating the low balanced heterotrophic and autotrophic activity. As the autotrophic activity exceeded the heterotrophic activity in late March and April, it resulted in a significant net oxygen accumulation in the bag incubations. Integrated over the entire season, the sea ice of Malene Bight was net autotrophic with an annual net carbon fixation of 220 mg C m– 2, reflecting the net result of a sea ice-related gross primary production of 350 mg C m– 2 and concurrent bacterial carbon demand of 130 mg C m– 2. Converting the O2 net exchange of the bag incubations into carbon turnover estimated an annual net carbon fixation of 1700 ± 760 mg C m– 2 (mean ± SD), which was higher than the annual net carbon fixation quantified in the standard incubations |
format |
Article in Journal/Newspaper |
author |
Søgaard, Dorte Haubjerg Kristensen, Morten Rysgaard, Søren Glud, Ronnie Nøhr Hansen, Per Juel Hillingsøe, Karen Marie |
spellingShingle |
Søgaard, Dorte Haubjerg Kristensen, Morten Rysgaard, Søren Glud, Ronnie Nøhr Hansen, Per Juel Hillingsøe, Karen Marie Autotrophic and heterotrophic activity in Arctic first-year sea ice:seasonal study from Malene Bight, SW Greenland |
author_facet |
Søgaard, Dorte Haubjerg Kristensen, Morten Rysgaard, Søren Glud, Ronnie Nøhr Hansen, Per Juel Hillingsøe, Karen Marie |
author_sort |
Søgaard, Dorte Haubjerg |
title |
Autotrophic and heterotrophic activity in Arctic first-year sea ice:seasonal study from Malene Bight, SW Greenland |
title_short |
Autotrophic and heterotrophic activity in Arctic first-year sea ice:seasonal study from Malene Bight, SW Greenland |
title_full |
Autotrophic and heterotrophic activity in Arctic first-year sea ice:seasonal study from Malene Bight, SW Greenland |
title_fullStr |
Autotrophic and heterotrophic activity in Arctic first-year sea ice:seasonal study from Malene Bight, SW Greenland |
title_full_unstemmed |
Autotrophic and heterotrophic activity in Arctic first-year sea ice:seasonal study from Malene Bight, SW Greenland |
title_sort |
autotrophic and heterotrophic activity in arctic first-year sea ice:seasonal study from malene bight, sw greenland |
publishDate |
2010 |
url |
https://curis.ku.dk/portal/da/publications/autotrophic-and-heterotrophic-activity-in-arctic-firstyear-sea-ice(7d4dc6b2-a61f-48c0-b562-490f02c3eb05).html https://doi.org/10.3354/meps08845 https://curis.ku.dk/ws/files/165175340/S_gaard_2010_Autotrophic_and_heterotrophic.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Greenland Sea ice |
genre_facet |
Arctic Arctic Greenland Sea ice |
op_source |
Søgaard , D H , Kristensen , M , Rysgaard , S , Glud , R N , Hansen , P J & Hillingsøe , K M 2010 , ' Autotrophic and heterotrophic activity in Arctic first-year sea ice : seasonal study from Malene Bight, SW Greenland ' , Marine Ecology - Progress Series , vol. 419 , pp. 31-45 . https://doi.org/10.3354/meps08845 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3354/meps08845 |
container_title |
Marine Ecology Progress Series |
container_volume |
419 |
container_start_page |
31 |
op_container_end_page |
45 |
_version_ |
1785556576898121728 |