Marked spatiotemporal variations in small phytoplankton structure in contrasted waters of the Southern Ocean (Kerguelen area)
International audience Abstract In the Southern Ocean, diatom blooms have attracted a lot of attention, while other small nonsilicified phytoplankton groups have been less studied. Here, small phytoplankton (< 20 μ m, including small diatoms and nonsilicified small phytoplankton) are focused on i...
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ftccsdartic:oai:HAL:hal-04385281v1 2024-02-27T08:35:24+00:00 Marked spatiotemporal variations in small phytoplankton structure in contrasted waters of the Southern Ocean (Kerguelen area) Irion, Solène Jardillier, Ludwig Sassenhagen, Ingrid Christaki, Urania Ecologie Systématique et Evolution (ESE) AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 2020-07 https://hal.science/hal-04385281 https://doi.org/10.1002/lno.11555 en eng HAL CCSD Association for the Sciences of Limnology and Oceanography info:eu-repo/semantics/altIdentifier/doi/10.1002/lno.11555 hal-04385281 https://hal.science/hal-04385281 doi:10.1002/lno.11555 ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.science/hal-04385281 Limnology and Oceanography, 2020, 65 (11), pp.2835-2852. ⟨10.1002/lno.11555⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1002/lno.11555 2024-01-28T00:10:29Z International audience Abstract In the Southern Ocean, diatom blooms have attracted a lot of attention, while other small nonsilicified phytoplankton groups have been less studied. Here, small phytoplankton (< 20 μ m, including small diatoms and nonsilicified small phytoplankton) are focused on in two contrasting areas: the productive Kerguelen plateau and its surrounding low productivity waters. To assess the diversity and spatial structuration of phytoplankton, discrete plankton samples (0–300 m layer) of two size fractions (< 20 and 20–100 μ m) were analyzed with 18S rDNA amplicon sequencing in late summer. Phytoplankton seasonal succession was described using flow cytometry, pigments, and environmental data, from two previous cruises (during the onset and decline of the diatom bloom). In the mixed layer, small nonsilicified phytoplankton represented less than 10% of chlorophyll a (Chl a ) during the onset and late diatom bloom on the plateau, but they increased on and off the plateau after the bloom (53–70% of Chl a ). Phaeocystis antarctica was relatively abundant at all stations after the bloom, but other small phytoplanktonic groups featured marked differences on and off the plateau. Higher concentrations on the plateau appeared to stimulate the presence of Micromonas , while Pelagophytes were enhanced off the plateau. A diverse assemblage of small diatoms was also promoted off the plateau, where silicate concentration was still high. Interestingly, P. antarctica represented up to 25% of all reads at 300 m depth off the plateau in the larger size fraction suggesting a significant contribution to carbon export through aggregation in low productive waters. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Kerguelen Southern Ocean Limnology and Oceanography 65 11 2835 2852 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Irion, Solène Jardillier, Ludwig Sassenhagen, Ingrid Christaki, Urania Marked spatiotemporal variations in small phytoplankton structure in contrasted waters of the Southern Ocean (Kerguelen area) |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Abstract In the Southern Ocean, diatom blooms have attracted a lot of attention, while other small nonsilicified phytoplankton groups have been less studied. Here, small phytoplankton (< 20 μ m, including small diatoms and nonsilicified small phytoplankton) are focused on in two contrasting areas: the productive Kerguelen plateau and its surrounding low productivity waters. To assess the diversity and spatial structuration of phytoplankton, discrete plankton samples (0–300 m layer) of two size fractions (< 20 and 20–100 μ m) were analyzed with 18S rDNA amplicon sequencing in late summer. Phytoplankton seasonal succession was described using flow cytometry, pigments, and environmental data, from two previous cruises (during the onset and decline of the diatom bloom). In the mixed layer, small nonsilicified phytoplankton represented less than 10% of chlorophyll a (Chl a ) during the onset and late diatom bloom on the plateau, but they increased on and off the plateau after the bloom (53–70% of Chl a ). Phaeocystis antarctica was relatively abundant at all stations after the bloom, but other small phytoplanktonic groups featured marked differences on and off the plateau. Higher concentrations on the plateau appeared to stimulate the presence of Micromonas , while Pelagophytes were enhanced off the plateau. A diverse assemblage of small diatoms was also promoted off the plateau, where silicate concentration was still high. Interestingly, P. antarctica represented up to 25% of all reads at 300 m depth off the plateau in the larger size fraction suggesting a significant contribution to carbon export through aggregation in low productive waters. |
author2 |
Ecologie Systématique et Evolution (ESE) AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Irion, Solène Jardillier, Ludwig Sassenhagen, Ingrid Christaki, Urania |
author_facet |
Irion, Solène Jardillier, Ludwig Sassenhagen, Ingrid Christaki, Urania |
author_sort |
Irion, Solène |
title |
Marked spatiotemporal variations in small phytoplankton structure in contrasted waters of the Southern Ocean (Kerguelen area) |
title_short |
Marked spatiotemporal variations in small phytoplankton structure in contrasted waters of the Southern Ocean (Kerguelen area) |
title_full |
Marked spatiotemporal variations in small phytoplankton structure in contrasted waters of the Southern Ocean (Kerguelen area) |
title_fullStr |
Marked spatiotemporal variations in small phytoplankton structure in contrasted waters of the Southern Ocean (Kerguelen area) |
title_full_unstemmed |
Marked spatiotemporal variations in small phytoplankton structure in contrasted waters of the Southern Ocean (Kerguelen area) |
title_sort |
marked spatiotemporal variations in small phytoplankton structure in contrasted waters of the southern ocean (kerguelen area) |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-04385281 https://doi.org/10.1002/lno.11555 |
geographic |
Kerguelen Southern Ocean |
geographic_facet |
Kerguelen Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_source |
ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.science/hal-04385281 Limnology and Oceanography, 2020, 65 (11), pp.2835-2852. ⟨10.1002/lno.11555⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/lno.11555 hal-04385281 https://hal.science/hal-04385281 doi:10.1002/lno.11555 |
op_doi |
https://doi.org/10.1002/lno.11555 |
container_title |
Limnology and Oceanography |
container_volume |
65 |
container_issue |
11 |
container_start_page |
2835 |
op_container_end_page |
2852 |
_version_ |
1792041952357646336 |