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...
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ftdoajarticles:oai:doaj.org/article:7742699c94974a0192fdba134b06a923 2023-05-15T14:50:12+02:00 Biogenic silica production and diatom dynamics in the Svalbard region during spring J. W. Krause C. M. Duarte I. A. Marquez P. Assmy M. Fernández-Méndez I. Wiedmann P. Wassmann S. Kristiansen S. Agustí 2018-11-01T00:00:00Z https://doi.org/10.5194/bg-15-6503-2018 https://doaj.org/article/7742699c94974a0192fdba134b06a923 EN eng Copernicus Publications https://www.biogeosciences.net/15/6503/2018/bg-15-6503-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-6503-2018 1726-4170 1726-4189 https://doaj.org/article/7742699c94974a0192fdba134b06a923 Biogeosciences, Vol 15, Pp 6503-6517 (2018) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.5194/bg-15-6503-2018 2022-12-31T05:18:57Z 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 ∼ 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 Phytoplankton Southern Ocean Svalbard Zooplankton Directory of Open Access Journals: DOAJ Articles Arctic Southern Ocean Arctic Ocean Svalbard Biogeosciences 15 21 6503 6517 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 J. W. Krause C. M. Duarte I. A. Marquez P. Assmy M. Fernández-Méndez I. Wiedmann P. Wassmann S. Kristiansen S. Agustí Biogenic silica production and diatom dynamics in the Svalbard region during spring |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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 ∼ 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 |
J. W. Krause C. M. Duarte I. A. Marquez P. Assmy M. Fernández-Méndez I. Wiedmann P. Wassmann S. Kristiansen S. Agustí |
author_facet |
J. W. Krause C. M. Duarte I. A. Marquez P. Assmy M. Fernández-Méndez I. Wiedmann P. Wassmann S. Kristiansen S. Agustí |
author_sort |
J. W. Krause |
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 |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-6503-2018 https://doaj.org/article/7742699c94974a0192fdba134b06a923 |
geographic |
Arctic Southern Ocean Arctic Ocean Svalbard |
geographic_facet |
Arctic Southern Ocean Arctic Ocean Svalbard |
genre |
Arctic Arctic Ocean Phytoplankton Southern Ocean Svalbard Zooplankton |
genre_facet |
Arctic Arctic Ocean Phytoplankton Southern Ocean Svalbard Zooplankton |
op_source |
Biogeosciences, Vol 15, Pp 6503-6517 (2018) |
op_relation |
https://www.biogeosciences.net/15/6503/2018/bg-15-6503-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-6503-2018 1726-4170 1726-4189 https://doaj.org/article/7742699c94974a0192fdba134b06a923 |
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 |
_version_ |
1766321249215053824 |