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 (...
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2017
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ftnioz:oai:imis.nioz.nl:286622 2023-05-15T14:54:46+02:00 Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords Holding, J.M. Duarte, C.M. Delgado-Huertas, A. Soetaert, K. Vonk, J.E. Agusti, S. Wassmann, P. Middelburg, J. 2017 http://imis.nioz.nl/imis.php?module=ref&refid=286622 en eng info:eu-repo/semantics/altIdentifier/wos/000402907100028 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1002/lno.10526 http://imis.nioz.nl/imis.php?module=ref&refid=286622 info:eu-repo/semantics/closedAccess %3Ci%3ELimnol.+Oceanogr.+62%283%29%3C%2Fi%3E%3A+1307-1323.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1002%2Flno.10526%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1002%2Flno.10526%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftnioz https://doi.org/10.1002/lno.10526 2022-05-01T14:05:56Z 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 δ13C of eukaryotic and prokaryotic planktonic groups using polar lipid-derived fatty acids as biomarkers in addition to measuring δ13C of marine particulate OC and dissolved OC from glacial runoff. δ13C 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 δ13C 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 NIOZ Repository (Royal Netherlands Institute for Sea Research) Arctic Arctic Ocean Svalbard Limnology and Oceanography 62 3 1307 1323 |
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Open Polar |
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NIOZ Repository (Royal Netherlands Institute for Sea Research) |
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ftnioz |
language |
English |
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 δ13C of eukaryotic and prokaryotic planktonic groups using polar lipid-derived fatty acids as biomarkers in addition to measuring δ13C of marine particulate OC and dissolved OC from glacial runoff. δ13C 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 δ13C 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. |
format |
Article in Journal/Newspaper |
author |
Holding, J.M. Duarte, C.M. Delgado-Huertas, A. Soetaert, K. Vonk, J.E. Agusti, S. Wassmann, P. Middelburg, J. |
spellingShingle |
Holding, J.M. Duarte, C.M. Delgado-Huertas, A. Soetaert, K. Vonk, J.E. Agusti, S. Wassmann, P. Middelburg, J. Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords |
author_facet |
Holding, J.M. Duarte, C.M. Delgado-Huertas, A. Soetaert, K. Vonk, J.E. Agusti, S. Wassmann, P. Middelburg, J. |
author_sort |
Holding, J.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 |
http://imis.nioz.nl/imis.php?module=ref&refid=286622 |
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 |
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op_relation |
info:eu-repo/semantics/altIdentifier/wos/000402907100028 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1002/lno.10526 http://imis.nioz.nl/imis.php?module=ref&refid=286622 |
op_rights |
info:eu-repo/semantics/closedAccess |
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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1766326521653362688 |