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...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2022
|
Subjects: | |
Online Access: | https://hdl.handle.net/11250/3049692 https://doi.org/10.5194/bg-19-5449-2022 |
id |
ftunivbergen:oai:bora.uib.no:11250/3049692 |
---|---|
record_format |
openpolar |
spelling |
ftunivbergen:oai:bora.uib.no:11250/3049692 2023-05-15T17:05:13+02:00 First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn Kauko, Hanna Maria Assmy, Philipp Peeken, Ilka Rózańska-Pluta, Magdalena Wiktor, Józef M Bratbak, Gunnar Singh, Asmita Ryan-Keogh, Thomas J. Moreau, Sebastien 2022 application/pdf https://hdl.handle.net/11250/3049692 https://doi.org/10.5194/bg-19-5449-2022 eng eng Copernicus Publications urn:issn:1726-4170 https://hdl.handle.net/11250/3049692 https://doi.org/10.5194/bg-19-5449-2022 cristin:2106587 Biogeosciences. 2022, 19 (23), 5449-5482. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2022 The Author(s) Biogeosciences 5449-5482 19 23 Journal article Peer reviewed 2022 ftunivbergen https://doi.org/10.5194/bg-19-5449-2022 2023-03-14T17:41:37Z 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. publishedVersion Article in Journal/Newspaper Kong Håkon VII Hav Southern Ocean University of Bergen: Bergen Open Research Archive (BORA-UiB) 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 |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
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. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Kauko, Hanna Maria Assmy, Philipp Peeken, Ilka Rózańska-Pluta, Magdalena Wiktor, Józef M Bratbak, Gunnar Singh, Asmita Ryan-Keogh, Thomas J. Moreau, Sebastien |
spellingShingle |
Kauko, Hanna Maria Assmy, Philipp Peeken, Ilka Rózańska-Pluta, Magdalena Wiktor, Józef M Bratbak, Gunnar Singh, Asmita Ryan-Keogh, Thomas J. Moreau, Sebastien First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn |
author_facet |
Kauko, Hanna Maria Assmy, Philipp Peeken, Ilka Rózańska-Pluta, Magdalena Wiktor, Józef M Bratbak, Gunnar Singh, Asmita Ryan-Keogh, Thomas J. Moreau, Sebastien |
author_sort |
Kauko, Hanna Maria |
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://hdl.handle.net/11250/3049692 https://doi.org/10.5194/bg-19-5449-2022 |
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 5449-5482 19 23 |
op_relation |
urn:issn:1726-4170 https://hdl.handle.net/11250/3049692 https://doi.org/10.5194/bg-19-5449-2022 cristin:2106587 Biogeosciences. 2022, 19 (23), 5449-5482. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2022 The Author(s) |
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 |
_version_ |
1766059614415093760 |