| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Composition of diatom communities and their contribution to plankton biomass in the naturally iron fertilized region of Kerguelen in the Southern Ocean
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| Autores: |
Lasbleiz, Marine
Leblanc, Karine
Armand, Leanne K.
Christaki, Urania
Georges, Clement
Obernosterer, Ingrid
Queguiner, Bernard
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| Data: |
2016-11
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| Ano: |
2016
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| Palavras-chave: |
Diatoms
Carbon biomass
Plankton community structure
Natural iron fertilization
Southern Ocean
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| Resumo: |
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 with 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00347/45850/45512.pdf
https://archimer.ifremer.fr/doc/00347/45850/45513.pdf
https://archimer.ifremer.fr/doc/00347/45850/45514.pdf
https://archimer.ifremer.fr/doc/00347/45850/45515.pdf
DOI:10.1093/femsec/fiw171
https://archimer.ifremer.fr/doc/00347/45850/
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| Editor: |
Oxford Univ Press
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| Formato: |
application/pdf
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| Fonte: |
Fems Microbiology Ecology (0168-6496) (Oxford Univ Press), 2016-11 , Vol. 92 , N. 11 , P. fix171 (1-6)
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| Direitos: |
FEMS 2016. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com
info:eu-repo/semantics/openAccess
restricted use
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