First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn
We studied phytoplankton and protozooplankton community composition based on light microscopy, flow cytometry, and photosynthetic pigment data in the Atlantic sector of the Southern Ocean during March 2019 (early austral autumn). Sampling was focused on the area east of the prime meridian in the Kon...
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2022
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Online Access: | https://doi.org/10.5194/bg-19-5449-2022 https://doaj.org/article/f3d7b8c41c134418a8f236df648aa408 |
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ftdoajarticles:oai:doaj.org/article:f3d7b8c41c134418a8f236df648aa408 2023-05-15T17:05:13+02:00 First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn H. M. Kauko P. Assmy I. Peeken M. Różańska-Pluta J. M. Wiktor G. Bratbak A. Singh T. J. Ryan-Keogh S. Moreau 2022-12-01T00:00:00Z https://doi.org/10.5194/bg-19-5449-2022 https://doaj.org/article/f3d7b8c41c134418a8f236df648aa408 EN eng Copernicus Publications https://bg.copernicus.org/articles/19/5449/2022/bg-19-5449-2022.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-19-5449-2022 1726-4170 1726-4189 https://doaj.org/article/f3d7b8c41c134418a8f236df648aa408 Biogeosciences, Vol 19, Pp 5449-5482 (2022) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/bg-19-5449-2022 2022-12-30T19:40:09Z We studied phytoplankton and protozooplankton community composition based on light microscopy, flow cytometry, and photosynthetic pigment data in the Atlantic sector of the Southern Ocean during March 2019 (early austral autumn). Sampling was focused on the area east of the prime meridian in the Kong Håkon VII Hav, including Astrid Ridge, Maud Rise, and a south–north transect at 6 ∘ E. Phytoplankton community composition throughout the studied area was characterized by oceanic diatoms typical of the iron-depleted high-nutrient, low-chlorophyll (HNLC) Southern Ocean. Topography and wind-driven iron supply likely sustained blooms dominated by the centric diatom Chaetoceros dichaeta at Maud Rise and at a station north of the 6 ∘ E transect. For the remainder of the 6 ∘ E transect, diatom composition was similar to the previously mentioned bloom stations, but flagellates dominated in abundance, suggesting a post-bloom situation and likely top-down control by krill on the bloom-forming diatoms. Among flagellates, species with haptophyte-type pigments were the dominating group. At Astrid Ridge, overall abundances were lower and pennate diatoms were more numerous than centric diatoms, but the community composition was nevertheless typical of HNLC areas. The observations described here show that C. dichaeta can form blooms beyond the background biomass level and also fuels both carbon export and upper trophic levels within HNLC areas. This study is the first thorough assessment of phytoplankton communities in this region and can be compared to other seasons in future studies. Article in Journal/Newspaper Kong Håkon VII Hav Southern Ocean Directory of Open Access Journals: DOAJ Articles Astrid Ridge ENVELOPE(12.000,12.000,-68.000,-68.000) Austral Kong Håkon VII Hav ENVELOPE(12.000,12.000,-67.000,-67.000) Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Southern Ocean Biogeosciences 19 23 5449 5482 |
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 H. M. Kauko P. Assmy I. Peeken M. Różańska-Pluta J. M. Wiktor G. Bratbak A. Singh T. J. Ryan-Keogh S. Moreau First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
We studied phytoplankton and protozooplankton community composition based on light microscopy, flow cytometry, and photosynthetic pigment data in the Atlantic sector of the Southern Ocean during March 2019 (early austral autumn). Sampling was focused on the area east of the prime meridian in the Kong Håkon VII Hav, including Astrid Ridge, Maud Rise, and a south–north transect at 6 ∘ E. Phytoplankton community composition throughout the studied area was characterized by oceanic diatoms typical of the iron-depleted high-nutrient, low-chlorophyll (HNLC) Southern Ocean. Topography and wind-driven iron supply likely sustained blooms dominated by the centric diatom Chaetoceros dichaeta at Maud Rise and at a station north of the 6 ∘ E transect. For the remainder of the 6 ∘ E transect, diatom composition was similar to the previously mentioned bloom stations, but flagellates dominated in abundance, suggesting a post-bloom situation and likely top-down control by krill on the bloom-forming diatoms. Among flagellates, species with haptophyte-type pigments were the dominating group. At Astrid Ridge, overall abundances were lower and pennate diatoms were more numerous than centric diatoms, but the community composition was nevertheless typical of HNLC areas. The observations described here show that C. dichaeta can form blooms beyond the background biomass level and also fuels both carbon export and upper trophic levels within HNLC areas. This study is the first thorough assessment of phytoplankton communities in this region and can be compared to other seasons in future studies. |
format |
Article in Journal/Newspaper |
author |
H. M. Kauko P. Assmy I. Peeken M. Różańska-Pluta J. M. Wiktor G. Bratbak A. Singh T. J. Ryan-Keogh S. Moreau |
author_facet |
H. M. Kauko P. Assmy I. Peeken M. Różańska-Pluta J. M. Wiktor G. Bratbak A. Singh T. J. Ryan-Keogh S. Moreau |
author_sort |
H. M. Kauko |
title |
First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn |
title_short |
First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn |
title_full |
First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn |
title_fullStr |
First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn |
title_full_unstemmed |
First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn |
title_sort |
first phytoplankton community assessment of the kong håkon vii hav, southern ocean, during austral autumn |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-5449-2022 https://doaj.org/article/f3d7b8c41c134418a8f236df648aa408 |
long_lat |
ENVELOPE(12.000,12.000,-68.000,-68.000) ENVELOPE(12.000,12.000,-67.000,-67.000) ENVELOPE(3.000,3.000,-66.000,-66.000) |
geographic |
Astrid Ridge Austral Kong Håkon VII Hav Maud Rise Southern Ocean |
geographic_facet |
Astrid Ridge Austral Kong Håkon VII Hav Maud Rise Southern Ocean |
genre |
Kong Håkon VII Hav Southern Ocean |
genre_facet |
Kong Håkon VII Hav Southern Ocean |
op_source |
Biogeosciences, Vol 19, Pp 5449-5482 (2022) |
op_relation |
https://bg.copernicus.org/articles/19/5449/2022/bg-19-5449-2022.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-19-5449-2022 1726-4170 1726-4189 https://doaj.org/article/f3d7b8c41c134418a8f236df648aa408 |
op_doi |
https://doi.org/10.5194/bg-19-5449-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
23 |
container_start_page |
5449 |
op_container_end_page |
5482 |
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1766059614994956288 |