Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean.
Identifieur interne : 003981 ( Ncbi/Curation ); précédent : 003980; suivant : 003982Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean.
Auteurs : Marine Lasbleiz [Oman] ; Karine Leblanc [France] ; Leanne K. Armand [Australie] ; Urania Christaki [France] ; Clément Georges [France] ; Ingrid Obernosterer [France] ; Bernard Quéguiner [France]Source :
- FEMS microbiology ecology [ 1574-6941 ] ; 2016.
Descripteurs français
- KwdFr :
- Archéobactéries (isolement et purification), Archéobactéries (métabolisme), Bactéries (isolement et purification), Bactéries (métabolisme), Biodiversité, Biomasse, Carbone (analyse), Carbone (métabolisme), Chlorophylle, Diatomées (), Diatomées (métabolisme), Fer (métabolisme), Océan Indien, Océans et mers, Phytoplancton (métabolisme), Saisons.
- MESH :
- analyse : Carbone.
- isolement et purification : Archéobactéries, Bactéries.
- métabolisme : Archéobactéries, Bactéries, Carbone, Diatomées, Fer, Phytoplancton.
- Biodiversité, Biomasse, Chlorophylle, Diatomées, Océan Indien, Océans et mers, Saisons.
English descriptors
- KwdEn :
- Archaea (isolation & purification), Archaea (metabolism), Bacteria (isolation & purification), Bacteria (metabolism), Biodiversity, Biomass, Carbon (analysis), Carbon (metabolism), Chlorophyll, Diatoms (classification), Diatoms (metabolism), Indian Ocean, Iron (metabolism), Oceans and Seas, Phytoplankton (metabolism), Seasons.
- MESH :
- chemical , analysis : Carbon.
- classification : Diatoms.
- isolation & purification : Archaea, Bacteria.
- metabolism : Archaea, Bacteria, Carbon, Diatoms, Iron, Phytoplankton.
- Biodiversity, Biomass, Chlorophyll, Indian Ocean, Oceans and Seas, Seasons.
Abstract
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.
DOI: 10.1093/femsec/fiw171
PubMed: 27515734
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type="city">Marseille</settlement><region type="region" nuts="2">Provence-Alpes-Côte d'Azur</region></placeName></affiliation></author><author><name sortKey="Leblanc, Karine" sort="Leblanc, Karine" uniqKey="Leblanc K" first="Karine" last="Leblanc">Karine Leblanc</name><affiliation wicri:level="4"><nlm:affiliation>Aix-Marseille Université, Université de Toulon, CNRS/INSU, IRD, MIO, UM 110, 13288, Marseille, Cedex 09, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Aix-Marseille Université, Université de Toulon, CNRS/INSU, IRD, MIO, UM 110, 13288, Marseille, Cedex 09</wicri:regionArea><wicri:noRegion>Cedex 09</wicri:noRegion><orgName type="university">Université d'Aix-Marseille</orgName><placeName><settlement type="city">Marseille</settlement><region type="region" nuts="2">Provence-Alpes-Côte d'Azur</region></placeName></affiliation></author><author><name sortKey="Armand, Leanne K" sort="Armand, Leanne K" uniqKey="Armand L" first="Leanne K" 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Wimereux</wicri:regionArea><wicri:noRegion>62930 Wimereux</wicri:noRegion><wicri:noRegion>62930 Wimereux</wicri:noRegion></affiliation></author><author><name sortKey="Georges, Clement" sort="Georges, Clement" uniqKey="Georges C" first="Clément" last="Georges">Clément Georges</name><affiliation wicri:level="1"><nlm:affiliation>INSU-CNRS, UMR8187 LOG, Laboratoire d'Océanologie et des Géosciences, Université du Littoral Côte d'Opale, ULCO, 32 avenue Foch, 62930 Wimereux, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>INSU-CNRS, UMR8187 LOG, Laboratoire d'Océanologie et des Géosciences, Université du Littoral Côte d'Opale, ULCO, 32 avenue Foch, 62930 Wimereux</wicri:regionArea><wicri:noRegion>62930 Wimereux</wicri:noRegion><wicri:noRegion>62930 Wimereux</wicri:noRegion></affiliation></author><author><name sortKey="Obernosterer, Ingrid" sort="Obernosterer, Ingrid" uniqKey="Obernosterer I" first="Ingrid" last="Obernosterer">Ingrid Obernosterer</name><affiliation wicri:level="1"><nlm:affiliation>CNRS, Sorbonne Universités, UPMC Univ Paris 06, Laboratoire d'Océanographie Microbienne (LOMIC), Observatoire Océanologique, F-66650 Banyuls/mer, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>CNRS, Sorbonne Universités, UPMC Univ Paris 06, Laboratoire d'Océanographie Microbienne (LOMIC), Observatoire Océanologique, F-66650 Banyuls/mer</wicri:regionArea><wicri:noRegion>66650 Banyuls/mer</wicri:noRegion><wicri:noRegion>66650 Banyuls/mer</wicri:noRegion></affiliation></author><author><name sortKey="Queguiner, Bernard" sort="Queguiner, Bernard" uniqKey="Queguiner B" first="Bernard" last="Quéguiner">Bernard Quéguiner</name><affiliation wicri:level="4"><nlm:affiliation>Aix-Marseille Université, Université de Toulon, CNRS/INSU, IRD, MIO, UM 110, 13288, Marseille, Cedex 09, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Aix-Marseille Université, Université de Toulon, CNRS/INSU, IRD, MIO, UM 110, 13288, Marseille, Cedex 09</wicri:regionArea><wicri:noRegion>Cedex 09</wicri:noRegion><orgName type="university">Université d'Aix-Marseille</orgName><placeName><settlement type="city">Marseille</settlement><region type="region" nuts="2">Provence-Alpes-Côte d'Azur</region></placeName></affiliation></author></analytic><series><title level="j">FEMS microbiology ecology</title><idno type="eISSN">1574-6941</idno><imprint><date when="2016" type="published">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Archaea (isolation & purification)</term><term>Archaea (metabolism)</term><term>Bacteria (isolation & purification)</term><term>Bacteria (metabolism)</term><term>Biodiversity</term><term>Biomass</term><term>Carbon (analysis)</term><term>Carbon (metabolism)</term><term>Chlorophyll</term><term>Diatoms (classification)</term><term>Diatoms (metabolism)</term><term>Indian Ocean</term><term>Iron (metabolism)</term><term>Oceans and Seas</term><term>Phytoplankton (metabolism)</term><term>Seasons</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Archéobactéries (isolement et purification)</term><term>Archéobactéries (métabolisme)</term><term>Bactéries (isolement et purification)</term><term>Bactéries (métabolisme)</term><term>Biodiversité</term><term>Biomasse</term><term>Carbone (analyse)</term><term>Carbone (métabolisme)</term><term>Chlorophylle</term><term>Diatomées ()</term><term>Diatomées (métabolisme)</term><term>Fer (métabolisme)</term><term>Océan Indien</term><term>Océans et mers</term><term>Phytoplancton (métabolisme)</term><term>Saisons</term></keywords><keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Carbon</term></keywords><keywords scheme="MESH" qualifier="analyse" xml:lang="fr"><term>Carbone</term></keywords><keywords scheme="MESH" qualifier="classification" xml:lang="en"><term>Diatoms</term></keywords><keywords scheme="MESH" qualifier="isolation & purification" xml:lang="en"><term>Archaea</term><term>Bacteria</term></keywords><keywords scheme="MESH" qualifier="isolement et purification" xml:lang="fr"><term>Archéobactéries</term><term>Bactéries</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Archaea</term><term>Bacteria</term><term>Carbon</term><term>Diatoms</term><term>Iron</term><term>Phytoplankton</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Archéobactéries</term><term>Bactéries</term><term>Carbone</term><term>Diatomées</term><term>Fer</term><term>Phytoplancton</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Biodiversity</term><term>Biomass</term><term>Chlorophyll</term><term>Indian Ocean</term><term>Oceans and Seas</term><term>Seasons</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Biodiversité</term><term>Biomasse</term><term>Chlorophylle</term><term>Diatomées</term><term>Océan Indien</term><term>Océans et mers</term><term>Saisons</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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