Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords
Abstract 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...
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crwiley:10.1002/lno.10526 2024-06-02T08:01:30+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. Agustí, Susana Wassmann, Paul Middelburg, Jack J. Royal Netherlands Institute for Sea research (NIOZ) in Yerseke Spanish Ministry of Economy and Inovation Netherlands Earth System Science Center JAE fellowship 2017 http://dx.doi.org/10.1002/lno.10526 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10526 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10526 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 62, issue 3, page 1307-1323 ISSN 0024-3590 1939-5590 journal-article 2017 crwiley https://doi.org/10.1002/lno.10526 2024-05-03T11:26:38Z Abstract 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 δ 13 C of eukaryotic and prokaryotic planktonic groups using polar lipid‐derived fatty acids as biomarkers in addition to measuring δ 13 C of marine particulate OC and dissolved OC from glacial runoff. δ 13 C 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 δ 13 C mixing model whereby ∼ 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 Phytoplankton Sea ice Svalbard Wiley Online Library Arctic Arctic Ocean Svalbard Limnology and Oceanography 62 3 1307 1323 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract 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 δ 13 C of eukaryotic and prokaryotic planktonic groups using polar lipid‐derived fatty acids as biomarkers in addition to measuring δ 13 C of marine particulate OC and dissolved OC from glacial runoff. δ 13 C 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 δ 13 C mixing model whereby ∼ 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. |
author2 |
Royal Netherlands Institute for Sea research (NIOZ) in Yerseke Spanish Ministry of Economy and Inovation Netherlands Earth System Science Center JAE fellowship |
format |
Article in Journal/Newspaper |
author |
Holding, Johnna M. Duarte, Carlos M. Delgado‐Huertas, Antonio Soetaert, Karline Vonk, Jorien E. Agustí, Susana Wassmann, Paul Middelburg, Jack J. |
spellingShingle |
Holding, Johnna M. Duarte, Carlos M. Delgado‐Huertas, Antonio Soetaert, Karline Vonk, Jorien E. Agustí, Susana Wassmann, Paul Middelburg, Jack J. Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords |
author_facet |
Holding, Johnna M. Duarte, Carlos M. Delgado‐Huertas, Antonio Soetaert, Karline Vonk, Jorien E. Agustí, 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 |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/lno.10526 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10526 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10526 |
geographic |
Arctic Arctic Ocean Svalbard |
geographic_facet |
Arctic Arctic Ocean Svalbard |
genre |
Arctic Arctic Ocean Phytoplankton Sea ice Svalbard |
genre_facet |
Arctic Arctic Ocean Phytoplankton Sea ice Svalbard |
op_source |
Limnology and Oceanography volume 62, issue 3, page 1307-1323 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
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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1800745884461301760 |