Diatom distribution in the Enderby Basin, East Antarctica
The distribution of diatom taxa was studied in the Enderby Basin, East Antarctica during the austral summer of 2010. In this study, the influence of freshwater at east of the 55°E was observed due to the melting of sea-ice, resulting in stratified (shallow Mixed Layer Depth (MLD)) and low saline con...
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ftnipr:oai:nipr.repo.nii.ac.jp:00016882 2023-05-15T13:46:39+02:00 Diatom distribution in the Enderby Basin, East Antarctica 2021-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16882 http://id.nii.ac.jp/1291/00016751/ en eng https://doi.org/10.1016/j.polar.2021.100748 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16882 http://id.nii.ac.jp/1291/00016751/ Polar Science, 30, 100748(2021-12) 18739652 Sea-ice Antarctica Melting Diatom Nutrients Journal Article 2021 ftnipr https://doi.org/10.1016/j.polar.2021.100748 2023-02-18T20:11:55Z The distribution of diatom taxa was studied in the Enderby Basin, East Antarctica during the austral summer of 2010. In this study, the influence of freshwater at east of the 55°E was observed due to the melting of sea-ice, resulting in stratified (shallow Mixed Layer Depth (MLD)) and low saline conditions. This decrease in sea-surface salinity was associated with an increase in pCO2 and decrease in total diatom abundance. Corethron criophilum was recognized as the most abundant diatom (absolute abundance up to 30 × 104 cells L−1; 35% contribution to total diatom taxa) and its elevated abundances recorded at west of the 55°E. Reduced C. criophilum and increased abundances of Fragilariopsis curta and Thalassiothrix antarctica were documented at east of the 55oE. This study shows that despite shallow MLD and macronutrient availability, the diatom abundance at east of 55oE was low. We suspect that, the factors such as micronutrient unavailability, freshening of the upper water column, transportation by water masses, and photoinhibition possibly affect the production of diatoms at east of the 55oE. The elevated abundance of diatoms to the west of the 55°E resulted in low pCO2 levels and high meso-zooplankton abundance. This study suggests the need of long term monitoring of phytoplankton community structure and factors influencing their production in the East Antarctic region. This is essential to better understand the projected effects of physico-chemical conditions (especially pCO2 and temperature) on Southern Ocean phytoplankton and thus biological carbon pump. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Polar Science Polar Science Sea ice Southern Ocean National Institute of Polar Research Repository, Japan Antarctic Southern Ocean East Antarctica Austral Polar Science 30 100748 |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
Sea-ice Antarctica Melting Diatom Nutrients |
spellingShingle |
Sea-ice Antarctica Melting Diatom Nutrients Diatom distribution in the Enderby Basin, East Antarctica |
topic_facet |
Sea-ice Antarctica Melting Diatom Nutrients |
description |
The distribution of diatom taxa was studied in the Enderby Basin, East Antarctica during the austral summer of 2010. In this study, the influence of freshwater at east of the 55°E was observed due to the melting of sea-ice, resulting in stratified (shallow Mixed Layer Depth (MLD)) and low saline conditions. This decrease in sea-surface salinity was associated with an increase in pCO2 and decrease in total diatom abundance. Corethron criophilum was recognized as the most abundant diatom (absolute abundance up to 30 × 104 cells L−1; 35% contribution to total diatom taxa) and its elevated abundances recorded at west of the 55°E. Reduced C. criophilum and increased abundances of Fragilariopsis curta and Thalassiothrix antarctica were documented at east of the 55oE. This study shows that despite shallow MLD and macronutrient availability, the diatom abundance at east of 55oE was low. We suspect that, the factors such as micronutrient unavailability, freshening of the upper water column, transportation by water masses, and photoinhibition possibly affect the production of diatoms at east of the 55oE. The elevated abundance of diatoms to the west of the 55°E resulted in low pCO2 levels and high meso-zooplankton abundance. This study suggests the need of long term monitoring of phytoplankton community structure and factors influencing their production in the East Antarctic region. This is essential to better understand the projected effects of physico-chemical conditions (especially pCO2 and temperature) on Southern Ocean phytoplankton and thus biological carbon pump. |
format |
Article in Journal/Newspaper |
title |
Diatom distribution in the Enderby Basin, East Antarctica |
title_short |
Diatom distribution in the Enderby Basin, East Antarctica |
title_full |
Diatom distribution in the Enderby Basin, East Antarctica |
title_fullStr |
Diatom distribution in the Enderby Basin, East Antarctica |
title_full_unstemmed |
Diatom distribution in the Enderby Basin, East Antarctica |
title_sort |
diatom distribution in the enderby basin, east antarctica |
publishDate |
2021 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16882 http://id.nii.ac.jp/1291/00016751/ |
geographic |
Antarctic Southern Ocean East Antarctica Austral |
geographic_facet |
Antarctic Southern Ocean East Antarctica Austral |
genre |
Antarc* Antarctic Antarctica East Antarctica Polar Science Polar Science Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Polar Science Polar Science Sea ice Southern Ocean |
op_relation |
https://doi.org/10.1016/j.polar.2021.100748 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16882 http://id.nii.ac.jp/1291/00016751/ Polar Science, 30, 100748(2021-12) 18739652 |
op_doi |
https://doi.org/10.1016/j.polar.2021.100748 |
container_title |
Polar Science |
container_volume |
30 |
container_start_page |
100748 |
_version_ |
1766244969158279168 |