Dynamics of an intense diatom bloom in the Northern Antarctic Peninsula, February 2016
Abstract Diatoms are considered the main base of the Southern Ocean food web as they are responsible for more than 85% of its annual primary production and play a crucial role in the Antarctic trophic structure and in the biogeochemical cycles. Within this context, an intense diatom bloom reaching &...
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Online Access: | http://dx.doi.org/10.1002/lno.11437 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11437 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11437 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11437 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11437 |
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crwiley:10.1002/lno.11437 2024-09-15T17:47:00+00:00 Dynamics of an intense diatom bloom in the Northern Antarctic Peninsula, February 2016 Costa, Raul Rodrigo Mendes, Carlos Rafael Borges Tavano, Virginia Maria Dotto, Tiago Segabinazzi Kerr, Rodrigo Monteiro, Thiago Odebrecht, Clarisse Secchi, Eduardo Resende Conselho Nacional de Desenvolvimento Científico e Tecnológico Coordenação de Aperfeiçoamento de Pessoal de Nível Superior 2020 http://dx.doi.org/10.1002/lno.11437 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11437 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11437 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11437 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11437 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ Limnology and Oceanography volume 65, issue 9, page 2056-2075 ISSN 0024-3590 1939-5590 journal-article 2020 crwiley https://doi.org/10.1002/lno.11437 2024-08-06T04:15:22Z Abstract Diatoms are considered the main base of the Southern Ocean food web as they are responsible for more than 85% of its annual primary production and play a crucial role in the Antarctic trophic structure and in the biogeochemical cycles. Within this context, an intense diatom bloom reaching > 45 mg m −3 of chlorophyll a was registered in the Northern Antarctic Peninsula (NAP) during a late summer study in February 2016. Given that nutrient concentrations and grazing activities were not identified here as limiting factors on the bloom development, the aim of this study was to evaluate the effect of water column structure (stability and upper mixed layer depth) on the phytoplankton biomass and composition in the NAP. The diatom bloom, mainly composed by the large centric Odontella weissflogii (mostly > 70 μ m in length), was associated with a local ocean carbon dioxide uptake that reached values greater than −60 mmol m −2 d −1 . We hypothesize that the presence of a vertically large water column stability barrier, just below the pycnocline, was the main driver allowing for the development of the intense diatom bloom, particularly in the Gerlache Strait. Contrarily, a shift from diatoms to dinoflagellates (mainly Gymnodiniales < 20 μ m) was observed associated with conditions of a highly stable thin layer. The results suggest that a large fraction of this intense diatom bloom is in fast sinking process, associated with low grazing pressure, showing a crucial role of diatoms for the efficiency of the biological carbon pump in this region. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Southern Ocean Wiley Online Library Limnology and Oceanography 65 9 2056 2075 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Diatoms are considered the main base of the Southern Ocean food web as they are responsible for more than 85% of its annual primary production and play a crucial role in the Antarctic trophic structure and in the biogeochemical cycles. Within this context, an intense diatom bloom reaching > 45 mg m −3 of chlorophyll a was registered in the Northern Antarctic Peninsula (NAP) during a late summer study in February 2016. Given that nutrient concentrations and grazing activities were not identified here as limiting factors on the bloom development, the aim of this study was to evaluate the effect of water column structure (stability and upper mixed layer depth) on the phytoplankton biomass and composition in the NAP. The diatom bloom, mainly composed by the large centric Odontella weissflogii (mostly > 70 μ m in length), was associated with a local ocean carbon dioxide uptake that reached values greater than −60 mmol m −2 d −1 . We hypothesize that the presence of a vertically large water column stability barrier, just below the pycnocline, was the main driver allowing for the development of the intense diatom bloom, particularly in the Gerlache Strait. Contrarily, a shift from diatoms to dinoflagellates (mainly Gymnodiniales < 20 μ m) was observed associated with conditions of a highly stable thin layer. The results suggest that a large fraction of this intense diatom bloom is in fast sinking process, associated with low grazing pressure, showing a crucial role of diatoms for the efficiency of the biological carbon pump in this region. |
author2 |
Conselho Nacional de Desenvolvimento Científico e Tecnológico Coordenação de Aperfeiçoamento de Pessoal de Nível Superior |
format |
Article in Journal/Newspaper |
author |
Costa, Raul Rodrigo Mendes, Carlos Rafael Borges Tavano, Virginia Maria Dotto, Tiago Segabinazzi Kerr, Rodrigo Monteiro, Thiago Odebrecht, Clarisse Secchi, Eduardo Resende |
spellingShingle |
Costa, Raul Rodrigo Mendes, Carlos Rafael Borges Tavano, Virginia Maria Dotto, Tiago Segabinazzi Kerr, Rodrigo Monteiro, Thiago Odebrecht, Clarisse Secchi, Eduardo Resende Dynamics of an intense diatom bloom in the Northern Antarctic Peninsula, February 2016 |
author_facet |
Costa, Raul Rodrigo Mendes, Carlos Rafael Borges Tavano, Virginia Maria Dotto, Tiago Segabinazzi Kerr, Rodrigo Monteiro, Thiago Odebrecht, Clarisse Secchi, Eduardo Resende |
author_sort |
Costa, Raul Rodrigo |
title |
Dynamics of an intense diatom bloom in the Northern Antarctic Peninsula, February 2016 |
title_short |
Dynamics of an intense diatom bloom in the Northern Antarctic Peninsula, February 2016 |
title_full |
Dynamics of an intense diatom bloom in the Northern Antarctic Peninsula, February 2016 |
title_fullStr |
Dynamics of an intense diatom bloom in the Northern Antarctic Peninsula, February 2016 |
title_full_unstemmed |
Dynamics of an intense diatom bloom in the Northern Antarctic Peninsula, February 2016 |
title_sort |
dynamics of an intense diatom bloom in the northern antarctic peninsula, february 2016 |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/lno.11437 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11437 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11437 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11437 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11437 |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
op_source |
Limnology and Oceanography volume 65, issue 9, page 2056-2075 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1002/lno.11437 |
container_title |
Limnology and Oceanography |
container_volume |
65 |
container_issue |
9 |
container_start_page |
2056 |
op_container_end_page |
2075 |
_version_ |
1810495474742853632 |