Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes
Microzooplankton play an important role in aquatic food webs through their multiple interactions with other organisms and their impact on carbon export. They are major predators of phytoplankton and bacteria while being preyed on by higher trophic levels. Microzooplankton diversity (Dinoflagellates,...
Published in: | Journal of Marine Systems |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://biblio.ugent.be/publication/01HYWJ0VFK12M69HKAZYQ7X34W http://hdl.handle.net/1854/LU-01HYWJ0VFK12M69HKAZYQ7X34W https://doi.org/10.1016/j.jmarsys.2021.103531 https://biblio.ugent.be/publication/01HYWJ0VFK12M69HKAZYQ7X34W/file/01J03VJ72V8H5PBN2JJ5MVVRDK |
id |
ftunivgent:oai:archive.ugent.be:01HYWJ0VFK12M69HKAZYQ7X34W |
---|---|
record_format |
openpolar |
spelling |
ftunivgent:oai:archive.ugent.be:01HYWJ0VFK12M69HKAZYQ7X34W 2024-09-15T17:48:08+00:00 Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes Christaki, Urania Skouroliakou, Dimitra-Ioli Delegrange, Alice Irion, Solène Courcot, Lucie Jardillier, Ludwig Sassenhagen, Ingrid 2021 application/pdf https://biblio.ugent.be/publication/01HYWJ0VFK12M69HKAZYQ7X34W http://hdl.handle.net/1854/LU-01HYWJ0VFK12M69HKAZYQ7X34W https://doi.org/10.1016/j.jmarsys.2021.103531 https://biblio.ugent.be/publication/01HYWJ0VFK12M69HKAZYQ7X34W/file/01J03VJ72V8H5PBN2JJ5MVVRDK eng eng https://biblio.ugent.be/publication/01HYWJ0VFK12M69HKAZYQ7X34W http://hdl.handle.net/1854/LU-01HYWJ0VFK12M69HKAZYQ7X34W http://doi.org/10.1016/j.jmarsys.2021.103531 https://biblio.ugent.be/publication/01HYWJ0VFK12M69HKAZYQ7X34W/file/01J03VJ72V8H5PBN2JJ5MVVRDK No license (in copyright) info:eu-repo/semantics/restrictedAccess JOURNAL OF MARINE SYSTEMS ISSN: 0924-7963 ISSN: 1879-1573 Biology and Life Sciences Earth and Environmental Sciences Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity PROTIST COMMUNITY COMPOSITION IRON-FERTILIZED REGION CO-INERTIA ANALYSIS ICE-EDGE ZONE PHYTOPLANKTON BLOOMS IN-SITU GRAZING IMPACT GROWTH KERGUELEN RATES journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftunivgent https://doi.org/10.1016/j.jmarsys.2021.103531 2024-07-10T16:00:38Z Microzooplankton play an important role in aquatic food webs through their multiple interactions with other organisms and their impact on carbon export. They are major predators of phytoplankton and bacteria while being preyed on by higher trophic levels. Microzooplankton diversity (Dinoflagellates, DIN and Ciliates, CIL), community structure, interaction with phytoplankton and its potential in channeling carbon to higher trophic levels were studied in contrasting productivity regimes (off- and on-plateau, the latter been naturally fertilized by iron) around the Kerguelen islands in the Southern Ocean (SO). DIN and CIL diversity was sampled in late summer (February–March 2018; project MOBYDICK) and at the onset-of the bloom (KEOPS2 cruise), and assessed by Illumina sequencing of 18S rDNA amplicons and microscopic observations. The diversity obtained by the two approaches could be compared at a relatively high taxonomic level (i.e., often to family level). In particular for DIN, relative abundances and ranking of dominant taxa differed between sequencing and microscopy observations. CIL were always recorded at considerably lower abundances than DIN, the median of their abundances across stations and seasons being 350 and 1370 cells L 1, respectively. During late summer, DIN and CIL biomasses were about 1.5 times higher on- than in off-plateau waters, while community composition was spatially similar. The most abundant DIN at all stations and during both seasons were small Gymnodinium (<20 μm). During late summer, ciliates Lohmaniella oviformis (<20 μm) and Cymatocylis antarctica (20-40 μm) dominated on- and off-plateau, respectively. Dilution experiments suggested significant grazing of microzooplankton on phytoplankton as phytoplankton net growth (k) was lower than microzooplankton grazing (g) at all stations (mean k = 0.16 ± 0.05 d 1, g = 0.36 ± 0.09 d 1) in late summer. Despite having great potential as a phyto plankton grazer, microzooplankton occurred at low biomass and showed little temporal ... Article in Journal/Newspaper Antarc* Antarctica Kerguelen Islands Southern Ocean Ghent University Academic Bibliography Journal of Marine Systems 219 103531 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Biology and Life Sciences Earth and Environmental Sciences Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity PROTIST COMMUNITY COMPOSITION IRON-FERTILIZED REGION CO-INERTIA ANALYSIS ICE-EDGE ZONE PHYTOPLANKTON BLOOMS IN-SITU GRAZING IMPACT GROWTH KERGUELEN RATES |
spellingShingle |
Biology and Life Sciences Earth and Environmental Sciences Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity PROTIST COMMUNITY COMPOSITION IRON-FERTILIZED REGION CO-INERTIA ANALYSIS ICE-EDGE ZONE PHYTOPLANKTON BLOOMS IN-SITU GRAZING IMPACT GROWTH KERGUELEN RATES Christaki, Urania Skouroliakou, Dimitra-Ioli Delegrange, Alice Irion, Solène Courcot, Lucie Jardillier, Ludwig Sassenhagen, Ingrid Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
topic_facet |
Biology and Life Sciences Earth and Environmental Sciences Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity PROTIST COMMUNITY COMPOSITION IRON-FERTILIZED REGION CO-INERTIA ANALYSIS ICE-EDGE ZONE PHYTOPLANKTON BLOOMS IN-SITU GRAZING IMPACT GROWTH KERGUELEN RATES |
description |
Microzooplankton play an important role in aquatic food webs through their multiple interactions with other organisms and their impact on carbon export. They are major predators of phytoplankton and bacteria while being preyed on by higher trophic levels. Microzooplankton diversity (Dinoflagellates, DIN and Ciliates, CIL), community structure, interaction with phytoplankton and its potential in channeling carbon to higher trophic levels were studied in contrasting productivity regimes (off- and on-plateau, the latter been naturally fertilized by iron) around the Kerguelen islands in the Southern Ocean (SO). DIN and CIL diversity was sampled in late summer (February–March 2018; project MOBYDICK) and at the onset-of the bloom (KEOPS2 cruise), and assessed by Illumina sequencing of 18S rDNA amplicons and microscopic observations. The diversity obtained by the two approaches could be compared at a relatively high taxonomic level (i.e., often to family level). In particular for DIN, relative abundances and ranking of dominant taxa differed between sequencing and microscopy observations. CIL were always recorded at considerably lower abundances than DIN, the median of their abundances across stations and seasons being 350 and 1370 cells L 1, respectively. During late summer, DIN and CIL biomasses were about 1.5 times higher on- than in off-plateau waters, while community composition was spatially similar. The most abundant DIN at all stations and during both seasons were small Gymnodinium (<20 μm). During late summer, ciliates Lohmaniella oviformis (<20 μm) and Cymatocylis antarctica (20-40 μm) dominated on- and off-plateau, respectively. Dilution experiments suggested significant grazing of microzooplankton on phytoplankton as phytoplankton net growth (k) was lower than microzooplankton grazing (g) at all stations (mean k = 0.16 ± 0.05 d 1, g = 0.36 ± 0.09 d 1) in late summer. Despite having great potential as a phyto plankton grazer, microzooplankton occurred at low biomass and showed little temporal ... |
format |
Article in Journal/Newspaper |
author |
Christaki, Urania Skouroliakou, Dimitra-Ioli Delegrange, Alice Irion, Solène Courcot, Lucie Jardillier, Ludwig Sassenhagen, Ingrid |
author_facet |
Christaki, Urania Skouroliakou, Dimitra-Ioli Delegrange, Alice Irion, Solène Courcot, Lucie Jardillier, Ludwig Sassenhagen, Ingrid |
author_sort |
Christaki, Urania |
title |
Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
title_short |
Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
title_full |
Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
title_fullStr |
Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
title_full_unstemmed |
Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
title_sort |
microzooplankton diversity and potential role in carbon cycling of contrasting southern ocean productivity regimes |
publishDate |
2021 |
url |
https://biblio.ugent.be/publication/01HYWJ0VFK12M69HKAZYQ7X34W http://hdl.handle.net/1854/LU-01HYWJ0VFK12M69HKAZYQ7X34W https://doi.org/10.1016/j.jmarsys.2021.103531 https://biblio.ugent.be/publication/01HYWJ0VFK12M69HKAZYQ7X34W/file/01J03VJ72V8H5PBN2JJ5MVVRDK |
genre |
Antarc* Antarctica Kerguelen Islands Southern Ocean |
genre_facet |
Antarc* Antarctica Kerguelen Islands Southern Ocean |
op_source |
JOURNAL OF MARINE SYSTEMS ISSN: 0924-7963 ISSN: 1879-1573 |
op_relation |
https://biblio.ugent.be/publication/01HYWJ0VFK12M69HKAZYQ7X34W http://hdl.handle.net/1854/LU-01HYWJ0VFK12M69HKAZYQ7X34W http://doi.org/10.1016/j.jmarsys.2021.103531 https://biblio.ugent.be/publication/01HYWJ0VFK12M69HKAZYQ7X34W/file/01J03VJ72V8H5PBN2JJ5MVVRDK |
op_rights |
No license (in copyright) info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.jmarsys.2021.103531 |
container_title |
Journal of Marine Systems |
container_volume |
219 |
container_start_page |
103531 |
_version_ |
1810289278604804096 |