Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords
Rising temperatures in the Arctic Ocean are causing sea ice and glaciers to melt at record breaking rates, which has consequences for carbon cycling in the Arctic Ocean that are yet to be fully understood. Microbial carbon cycling is driven by internal processing of in situ produced organic carbon (...
Published in: | Limnology and Oceanography |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://pure.au.dk/portal/en/publications/66b91cb5-c3d4-41f2-a0ab-014a1523ff81 https://doi.org/10.1002/lno.10526 |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/66b91cb5-c3d4-41f2-a0ab-014a1523ff81 2024-04-14T08:06:50+00:00 Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords Holding, Johnna M. Duarte, Carlos M. Delgado-Huertas, Antonio Soetaert, Karline Vonk, Jorien E. Agusti, Susana Wassmann, Paul Middelburg, Jack J. 2017-05 https://pure.au.dk/portal/en/publications/66b91cb5-c3d4-41f2-a0ab-014a1523ff81 https://doi.org/10.1002/lno.10526 eng eng https://pure.au.dk/portal/en/publications/66b91cb5-c3d4-41f2-a0ab-014a1523ff81 info:eu-repo/semantics/restrictedAccess Holding , J M , Duarte , C M , Delgado-Huertas , A , Soetaert , K , Vonk , J E , Agusti , S , Wassmann , P & Middelburg , J J 2017 , ' Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords ' , Limnology and Oceanography , vol. 62 , no. 3 , pp. 1307-1323 . https://doi.org/10.1002/lno.10526 ARCTIC MARINE ECOSYSTEM ELEVATED CO2 LEVELS SEA-ICE ALGAE STABLE-ISOTOPES FATTY-ACIDS HETEROTROPHIC BACTERIA PLANKTON COMMUNITY INORGANIC CARBON BARENTS SEA MATTER article 2017 ftuniaarhuspubl https://doi.org/10.1002/lno.10526 2024-03-21T15:27:12Z Rising temperatures in the Arctic Ocean are causing sea ice and glaciers to melt at record breaking rates, which has consequences for carbon cycling in the Arctic Ocean that are yet to be fully understood. Microbial carbon cycling is driven by internal processing of in situ produced organic carbon (OC), however recent research suggests that melt water from sea ice and glaciers could introduce an allochthonous source of OC to the microbial food web with ramifications for the metabolic balance of plankton communities. In this study, we characterized autochthonous and allochthonous sources of OC to the Western Svalbard fjord system using stable isotopes of carbon. We quantified delta C-13 of eukaryotic and prokaryotic planktonic groups using polar lipid-derived fatty acids as biomarkers in addition to measuring delta C-13 of marine particulate OC and dissolved OC from glacial runoff. delta C-13 of bacteria (-22.5&) was higher than that of glacial runoff OC (-28.5&) and other phytoplankton groups (-24.7 to -29.1&), which suggests that marine bacteria preferentially use a third source of OC. We present a Bayesian three-source delta C-13 mixing model whereby similar to 60% of bacteria carbon is derived from OC in sea ice, and the remaining carbon is derived from autochthonous production and glacial-derived OC. These results suggest that subsidies of OC from melting glaciers will not likely influence microbial carbon cycling in Svalbard fjords in the future and that further research is needed to determine the effects of melting sea ice on microbial carbon cycling in fjord systems and elsewhere in the Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Ocean Barents Sea ice algae Phytoplankton Sea ice Svalbard Aarhus University: Research Arctic Arctic Ocean Barents Sea Svalbard Limnology and Oceanography 62 3 1307 1323 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
ARCTIC MARINE ECOSYSTEM ELEVATED CO2 LEVELS SEA-ICE ALGAE STABLE-ISOTOPES FATTY-ACIDS HETEROTROPHIC BACTERIA PLANKTON COMMUNITY INORGANIC CARBON BARENTS SEA MATTER |
spellingShingle |
ARCTIC MARINE ECOSYSTEM ELEVATED CO2 LEVELS SEA-ICE ALGAE STABLE-ISOTOPES FATTY-ACIDS HETEROTROPHIC BACTERIA PLANKTON COMMUNITY INORGANIC CARBON BARENTS SEA MATTER Holding, Johnna M. Duarte, Carlos M. Delgado-Huertas, Antonio Soetaert, Karline Vonk, Jorien E. Agusti, Susana Wassmann, Paul Middelburg, Jack J. Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords |
topic_facet |
ARCTIC MARINE ECOSYSTEM ELEVATED CO2 LEVELS SEA-ICE ALGAE STABLE-ISOTOPES FATTY-ACIDS HETEROTROPHIC BACTERIA PLANKTON COMMUNITY INORGANIC CARBON BARENTS SEA MATTER |
description |
Rising temperatures in the Arctic Ocean are causing sea ice and glaciers to melt at record breaking rates, which has consequences for carbon cycling in the Arctic Ocean that are yet to be fully understood. Microbial carbon cycling is driven by internal processing of in situ produced organic carbon (OC), however recent research suggests that melt water from sea ice and glaciers could introduce an allochthonous source of OC to the microbial food web with ramifications for the metabolic balance of plankton communities. In this study, we characterized autochthonous and allochthonous sources of OC to the Western Svalbard fjord system using stable isotopes of carbon. We quantified delta C-13 of eukaryotic and prokaryotic planktonic groups using polar lipid-derived fatty acids as biomarkers in addition to measuring delta C-13 of marine particulate OC and dissolved OC from glacial runoff. delta C-13 of bacteria (-22.5&) was higher than that of glacial runoff OC (-28.5&) and other phytoplankton groups (-24.7 to -29.1&), which suggests that marine bacteria preferentially use a third source of OC. We present a Bayesian three-source delta C-13 mixing model whereby similar to 60% of bacteria carbon is derived from OC in sea ice, and the remaining carbon is derived from autochthonous production and glacial-derived OC. These results suggest that subsidies of OC from melting glaciers will not likely influence microbial carbon cycling in Svalbard fjords in the future and that further research is needed to determine the effects of melting sea ice on microbial carbon cycling in fjord systems and elsewhere in the Arctic Ocean. |
format |
Article in Journal/Newspaper |
author |
Holding, Johnna M. Duarte, Carlos M. Delgado-Huertas, Antonio Soetaert, Karline Vonk, Jorien E. Agusti, Susana Wassmann, Paul Middelburg, Jack J. |
author_facet |
Holding, Johnna M. Duarte, Carlos M. Delgado-Huertas, Antonio Soetaert, Karline Vonk, Jorien E. Agusti, Susana Wassmann, Paul Middelburg, Jack J. |
author_sort |
Holding, Johnna M. |
title |
Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords |
title_short |
Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords |
title_full |
Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords |
title_fullStr |
Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords |
title_full_unstemmed |
Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords |
title_sort |
autochthonous and allochthonous contributions of organic carbon to microbial food webs in svalbard fjords |
publishDate |
2017 |
url |
https://pure.au.dk/portal/en/publications/66b91cb5-c3d4-41f2-a0ab-014a1523ff81 https://doi.org/10.1002/lno.10526 |
geographic |
Arctic Arctic Ocean Barents Sea Svalbard |
geographic_facet |
Arctic Arctic Ocean Barents Sea Svalbard |
genre |
Arctic Arctic Ocean Barents Sea ice algae Phytoplankton Sea ice Svalbard |
genre_facet |
Arctic Arctic Ocean Barents Sea ice algae Phytoplankton Sea ice Svalbard |
op_source |
Holding , J M , Duarte , C M , Delgado-Huertas , A , Soetaert , K , Vonk , J E , Agusti , S , Wassmann , P & Middelburg , J J 2017 , ' Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords ' , Limnology and Oceanography , vol. 62 , no. 3 , pp. 1307-1323 . https://doi.org/10.1002/lno.10526 |
op_relation |
https://pure.au.dk/portal/en/publications/66b91cb5-c3d4-41f2-a0ab-014a1523ff81 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/lno.10526 |
container_title |
Limnology and Oceanography |
container_volume |
62 |
container_issue |
3 |
container_start_page |
1307 |
op_container_end_page |
1323 |
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1796304045085818880 |