Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean
In the naturally iron-fertilized surface waters of the northern Kerguelen Plateau region, the early spring diatom community composition and contribution to plankton carbon biomass were investigated and compared with the high nutrient, low chlorophyll (HNLC) surrounding waters. The large iron-induced...
Published in: | FEMS Microbiology Ecology |
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Format: | Article in Journal/Newspaper |
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2016
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Online Access: | https://researchers.mq.edu.au/en/publications/dd368de5-9cb3-4470-88d0-fcaa9e7a0c13 https://doi.org/10.1093/femsec/fiw171 http://www.scopus.com/inward/record.url?scp=84992708597&partnerID=8YFLogxK |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/dd368de5-9cb3-4470-88d0-fcaa9e7a0c13 2024-09-30T14:44:00+00:00 Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean Lasbleiz, Marine Leblanc, Karine Armand, Leanne K. Christaki, Urania Georges, Clément Obernosterer, Ingrid Quéguiner, Bernard 2016-11 https://researchers.mq.edu.au/en/publications/dd368de5-9cb3-4470-88d0-fcaa9e7a0c13 https://doi.org/10.1093/femsec/fiw171 http://www.scopus.com/inward/record.url?scp=84992708597&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Lasbleiz , M , Leblanc , K , Armand , L K , Christaki , U , Georges , C , Obernosterer , I & Quéguiner , B 2016 , ' Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean ' , FEMS Microbiology Ecology , vol. 92 , no. 11 , fiw171 , pp. 1-16 . https://doi.org/10.1093/femsec/fiw171 diatoms carbon biomass plankton community structure natural iron fertilization Southern Ocean article 2016 ftmacquarieunicr https://doi.org/10.1093/femsec/fiw171 2024-09-04T23:52:01Z In the naturally iron-fertilized surface waters of the northern Kerguelen Plateau region, the early spring diatom community composition and contribution to plankton carbon biomass were investigated and compared with the high nutrient, low chlorophyll (HNLC) surrounding waters. The large iron-induced blooms were dominated by small diatom species belonging to the genera Chaetoceros (Hyalochaete) and Thalassiosira, which rapidly responded to the onset of favorable light-conditions in the meander of the Polar Front. In comparison, the iron-limited HNLC area was typically characterized by autotrophic nanoeukaryote-dominated communities and by larger and more heavily silicified diatom species (e.g. Fragilariopsis spp.). Our results support the hypothesis that diatoms are valuable vectors of carbon export to depth in naturally iron-fertilized systems of the Southern Ocean. Furthermore, our results corroborate observations of the exported diatom assemblage from a sediment trap deployed in the iron-fertilized area, whereby the dominant Chaetoceros (Hyalochaete) cells were less efficiently exported than the less abundant, yet heavily silicified, cells of Thalassionema nitzschioides and Fragilariopsis kerguelensis. Our observations emphasize the strong influence of species-specific diatom cell properties combined with trophic interactions on matter export efficiency, and illustrate the tight link between the specific composition of phytoplankton communities and the biogeochemical properties characterizing the study area. Article in Journal/Newspaper Southern Ocean Macquarie University Research Portal Kerguelen Southern Ocean FEMS Microbiology Ecology 92 11 fiw171 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
diatoms carbon biomass plankton community structure natural iron fertilization Southern Ocean |
spellingShingle |
diatoms carbon biomass plankton community structure natural iron fertilization Southern Ocean Lasbleiz, Marine Leblanc, Karine Armand, Leanne K. Christaki, Urania Georges, Clément Obernosterer, Ingrid Quéguiner, Bernard Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean |
topic_facet |
diatoms carbon biomass plankton community structure natural iron fertilization Southern Ocean |
description |
In the naturally iron-fertilized surface waters of the northern Kerguelen Plateau region, the early spring diatom community composition and contribution to plankton carbon biomass were investigated and compared with the high nutrient, low chlorophyll (HNLC) surrounding waters. The large iron-induced blooms were dominated by small diatom species belonging to the genera Chaetoceros (Hyalochaete) and Thalassiosira, which rapidly responded to the onset of favorable light-conditions in the meander of the Polar Front. In comparison, the iron-limited HNLC area was typically characterized by autotrophic nanoeukaryote-dominated communities and by larger and more heavily silicified diatom species (e.g. Fragilariopsis spp.). Our results support the hypothesis that diatoms are valuable vectors of carbon export to depth in naturally iron-fertilized systems of the Southern Ocean. Furthermore, our results corroborate observations of the exported diatom assemblage from a sediment trap deployed in the iron-fertilized area, whereby the dominant Chaetoceros (Hyalochaete) cells were less efficiently exported than the less abundant, yet heavily silicified, cells of Thalassionema nitzschioides and Fragilariopsis kerguelensis. Our observations emphasize the strong influence of species-specific diatom cell properties combined with trophic interactions on matter export efficiency, and illustrate the tight link between the specific composition of phytoplankton communities and the biogeochemical properties characterizing the study area. |
format |
Article in Journal/Newspaper |
author |
Lasbleiz, Marine Leblanc, Karine Armand, Leanne K. Christaki, Urania Georges, Clément Obernosterer, Ingrid Quéguiner, Bernard |
author_facet |
Lasbleiz, Marine Leblanc, Karine Armand, Leanne K. Christaki, Urania Georges, Clément Obernosterer, Ingrid Quéguiner, Bernard |
author_sort |
Lasbleiz, Marine |
title |
Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean |
title_short |
Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean |
title_full |
Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean |
title_fullStr |
Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean |
title_full_unstemmed |
Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean |
title_sort |
composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of kerguelen in the southern ocean |
publishDate |
2016 |
url |
https://researchers.mq.edu.au/en/publications/dd368de5-9cb3-4470-88d0-fcaa9e7a0c13 https://doi.org/10.1093/femsec/fiw171 http://www.scopus.com/inward/record.url?scp=84992708597&partnerID=8YFLogxK |
geographic |
Kerguelen Southern Ocean |
geographic_facet |
Kerguelen Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Lasbleiz , M , Leblanc , K , Armand , L K , Christaki , U , Georges , C , Obernosterer , I & Quéguiner , B 2016 , ' Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean ' , FEMS Microbiology Ecology , vol. 92 , no. 11 , fiw171 , pp. 1-16 . https://doi.org/10.1093/femsec/fiw171 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/femsec/fiw171 |
container_title |
FEMS Microbiology Ecology |
container_volume |
92 |
container_issue |
11 |
container_start_page |
fiw171 |
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1811645531673329664 |