Biogenic silica production and diatom dynamics in the Svalbard region during spring
Diatoms are generally the dominant contributors to the Arctic Ocean spring bloom, which is a key event in regional food webs in terms of capacity for secondary production and organic matter export. Dissolved silicic acid is an obligate nutrient for diatoms and has been declining in the European Arct...
Published in: | Biogeosciences |
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Language: | English |
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2018
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Online Access: | https://pure.au.dk/portal/en/publications/d1d13fb6-f493-4b29-b411-e8c92b00eef7 https://doi.org/10.5194/bg-15-6503-2018 https://pure.au.dk/ws/files/136704561/bg_15_6503_2018.pdf |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/d1d13fb6-f493-4b29-b411-e8c92b00eef7 2024-01-14T10:03:52+01:00 Biogenic silica production and diatom dynamics in the Svalbard region during spring Krause, Jeffrey W. Duarte, Carlos M. Marquez, Israel A. Assmy, Philipp Fernandez-Mendez, Mar Wiedmann, Ingrid Wassmann, Paul Kristiansen, Svein Agusti, Susana 2018-11-06 application/pdf https://pure.au.dk/portal/en/publications/d1d13fb6-f493-4b29-b411-e8c92b00eef7 https://doi.org/10.5194/bg-15-6503-2018 https://pure.au.dk/ws/files/136704561/bg_15_6503_2018.pdf eng eng https://pure.au.dk/portal/en/publications/d1d13fb6-f493-4b29-b411-e8c92b00eef7 info:eu-repo/semantics/openAccess Krause , J W , Duarte , C M , Marquez , I A , Assmy , P , Fernandez-Mendez , M , Wiedmann , I , Wassmann , P , Kristiansen , S & Agusti , S 2018 , ' Biogenic silica production and diatom dynamics in the Svalbard region during spring ' , Biogeosciences , vol. 15 , no. 21 , pp. 6503-6517 . https://doi.org/10.5194/bg-15-6503-2018 CENTRAL BARENTS SEA MARGINAL ICE-ZONE PACIFIC SUBTROPICAL GYRE SOUTHERN-OCEAN PHYTOPLANKTON BLOOMS ARCTIC-OCEAN NORTHEAST ATLANTIC SEASONAL-VARIATION NUTRIENT DYNAMICS CHLOROPHYLL-A article 2018 ftuniaarhuspubl https://doi.org/10.5194/bg-15-6503-2018 2023-12-20T23:59:54Z Diatoms are generally the dominant contributors to the Arctic Ocean spring bloom, which is a key event in regional food webs in terms of capacity for secondary production and organic matter export. Dissolved silicic acid is an obligate nutrient for diatoms and has been declining in the European Arctic since the early 1990s. The lack of regional silicon cycling information precludes understanding the consequences of such changes for diatom productivity during the Arctic spring bloom. This study communicates the results from a cruise in the European Arctic around Svalbard, which reports the first concurrent data on biogenic silica production and export, export of diatom cells, the degree of kinetic limitation by ambient silicic acid, and diatom contribution to primary production. Regional biogenic silica production rates were significantly lower than those achievable in the Southern Ocean and silicic acid concentration limited the biogenic silica production rate in 95% of samples. Compared to diatoms in the Atlantic subtropical gyre, regional diatoms are less adapted for silicic acid uptake at low concentration, and at some stations during the present study, silicon kinetic limitation may have been intense enough to limit diatom growth. Thus, silicic acid can play a critical role in diatom spring bloom dynamics. The diatom contribution to primary production was variable, ranging from <10% to similar to 100% depending on the bloom stage and phytoplankton composition. While there was agreement with previous studies regarding the export rate of diatom cells, we observed significantly elevated biogenic silica export. Such a discrepancy can be resolved if a higher fraction of the diatom material exported during our study was modified by zooplankton grazers. This study provides the most direct evidence to date suggesting the important coupling of the silicon and carbon cycles during the spring bloom in the European Arctic. Article in Journal/Newspaper Arctic Arctic Ocean Barents Sea Northeast Atlantic Phytoplankton Southern Ocean Svalbard Zooplankton Aarhus University: Research Arctic Arctic Ocean Barents Sea Pacific Southern Ocean Svalbard Biogeosciences 15 21 6503 6517 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
CENTRAL BARENTS SEA MARGINAL ICE-ZONE PACIFIC SUBTROPICAL GYRE SOUTHERN-OCEAN PHYTOPLANKTON BLOOMS ARCTIC-OCEAN NORTHEAST ATLANTIC SEASONAL-VARIATION NUTRIENT DYNAMICS CHLOROPHYLL-A |
spellingShingle |
CENTRAL BARENTS SEA MARGINAL ICE-ZONE PACIFIC SUBTROPICAL GYRE SOUTHERN-OCEAN PHYTOPLANKTON BLOOMS ARCTIC-OCEAN NORTHEAST ATLANTIC SEASONAL-VARIATION NUTRIENT DYNAMICS CHLOROPHYLL-A Krause, Jeffrey W. Duarte, Carlos M. Marquez, Israel A. Assmy, Philipp Fernandez-Mendez, Mar Wiedmann, Ingrid Wassmann, Paul Kristiansen, Svein Agusti, Susana Biogenic silica production and diatom dynamics in the Svalbard region during spring |
topic_facet |
CENTRAL BARENTS SEA MARGINAL ICE-ZONE PACIFIC SUBTROPICAL GYRE SOUTHERN-OCEAN PHYTOPLANKTON BLOOMS ARCTIC-OCEAN NORTHEAST ATLANTIC SEASONAL-VARIATION NUTRIENT DYNAMICS CHLOROPHYLL-A |
description |
Diatoms are generally the dominant contributors to the Arctic Ocean spring bloom, which is a key event in regional food webs in terms of capacity for secondary production and organic matter export. Dissolved silicic acid is an obligate nutrient for diatoms and has been declining in the European Arctic since the early 1990s. The lack of regional silicon cycling information precludes understanding the consequences of such changes for diatom productivity during the Arctic spring bloom. This study communicates the results from a cruise in the European Arctic around Svalbard, which reports the first concurrent data on biogenic silica production and export, export of diatom cells, the degree of kinetic limitation by ambient silicic acid, and diatom contribution to primary production. Regional biogenic silica production rates were significantly lower than those achievable in the Southern Ocean and silicic acid concentration limited the biogenic silica production rate in 95% of samples. Compared to diatoms in the Atlantic subtropical gyre, regional diatoms are less adapted for silicic acid uptake at low concentration, and at some stations during the present study, silicon kinetic limitation may have been intense enough to limit diatom growth. Thus, silicic acid can play a critical role in diatom spring bloom dynamics. The diatom contribution to primary production was variable, ranging from <10% to similar to 100% depending on the bloom stage and phytoplankton composition. While there was agreement with previous studies regarding the export rate of diatom cells, we observed significantly elevated biogenic silica export. Such a discrepancy can be resolved if a higher fraction of the diatom material exported during our study was modified by zooplankton grazers. This study provides the most direct evidence to date suggesting the important coupling of the silicon and carbon cycles during the spring bloom in the European Arctic. |
format |
Article in Journal/Newspaper |
author |
Krause, Jeffrey W. Duarte, Carlos M. Marquez, Israel A. Assmy, Philipp Fernandez-Mendez, Mar Wiedmann, Ingrid Wassmann, Paul Kristiansen, Svein Agusti, Susana |
author_facet |
Krause, Jeffrey W. Duarte, Carlos M. Marquez, Israel A. Assmy, Philipp Fernandez-Mendez, Mar Wiedmann, Ingrid Wassmann, Paul Kristiansen, Svein Agusti, Susana |
author_sort |
Krause, Jeffrey W. |
title |
Biogenic silica production and diatom dynamics in the Svalbard region during spring |
title_short |
Biogenic silica production and diatom dynamics in the Svalbard region during spring |
title_full |
Biogenic silica production and diatom dynamics in the Svalbard region during spring |
title_fullStr |
Biogenic silica production and diatom dynamics in the Svalbard region during spring |
title_full_unstemmed |
Biogenic silica production and diatom dynamics in the Svalbard region during spring |
title_sort |
biogenic silica production and diatom dynamics in the svalbard region during spring |
publishDate |
2018 |
url |
https://pure.au.dk/portal/en/publications/d1d13fb6-f493-4b29-b411-e8c92b00eef7 https://doi.org/10.5194/bg-15-6503-2018 https://pure.au.dk/ws/files/136704561/bg_15_6503_2018.pdf |
geographic |
Arctic Arctic Ocean Barents Sea Pacific Southern Ocean Svalbard |
geographic_facet |
Arctic Arctic Ocean Barents Sea Pacific Southern Ocean Svalbard |
genre |
Arctic Arctic Ocean Barents Sea Northeast Atlantic Phytoplankton Southern Ocean Svalbard Zooplankton |
genre_facet |
Arctic Arctic Ocean Barents Sea Northeast Atlantic Phytoplankton Southern Ocean Svalbard Zooplankton |
op_source |
Krause , J W , Duarte , C M , Marquez , I A , Assmy , P , Fernandez-Mendez , M , Wiedmann , I , Wassmann , P , Kristiansen , S & Agusti , S 2018 , ' Biogenic silica production and diatom dynamics in the Svalbard region during spring ' , Biogeosciences , vol. 15 , no. 21 , pp. 6503-6517 . https://doi.org/10.5194/bg-15-6503-2018 |
op_relation |
https://pure.au.dk/portal/en/publications/d1d13fb6-f493-4b29-b411-e8c92b00eef7 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-15-6503-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
21 |
container_start_page |
6503 |
op_container_end_page |
6517 |
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1788058540276973568 |