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Your search keyword '"Grattepanche, Jean‐David"' showing total 14 results
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14 results on '"Grattepanche, Jean‐David"'

12. Impact of anticyclonic mesoscale features on the Mediterranean Sea's microbial food web

Author

Christaki , Urania, Van Wambeke , F., Lefevre , D., Lagaria , A., Prieur , L., Pujo Pay , M., Grattepanche , Jean-David, Colombet , J., Psarra , S., Dolan , J., Sime-Ngando , Télesphore, Weinbauer , M., Moutin , T., Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 ( LOG ), Université de Lille-Université du Littoral Côte d'Opale-Centre National de la Recherche Scientifique ( CNRS ), MREN, équipe écologie planctonique, Université du Littoral Côte d'Opale-PRES Université Lille Nord de France-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Microorganismes : Génome et Environnement ( LMGE ), Université Blaise Pascal - Clermont-Ferrand 2 ( UBP ) -Université d'Auvergne - Clermont-Ferrand I ( UdA ) -Centre National de la Recherche Scientifique ( CNRS ), Inst. of Oceanography, Hellenic Centre for Marine Research ( HCMR ), Smurfit Institute of Genetics, Trinity College Dublin, Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS), Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS), Laboratoire Microorganismes : Génome et Environnement (LMGE), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université d'Auvergne - Clermont-Ferrand I (UdA)-Centre National de la Recherche Scientifique (CNRS), Hellenic Centre for Marine Research (HCMR), Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Nord]), Laboratoire d'océanographie de Villefranche (LOV), Observatoire océanologique de Villefranche-sur-mer (OOVM), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[ SDU.STU.OC ] Sciences of the Universe [physics]/Earth Sciences/Oceanography, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Abstract

International audience; The abundance and activity of the major members of the heterotrophic microbial community - from viruses to ciliates - were studied along a longitudinal transect across the Mediterranean Sea in the summer of 2008. The Mediterranean Sea is characterized by a west to the east gradient of deepening of DCM (deep chlorophyll maximum) and increasing oligotrophy reflected in gradients of heterotrophic microbial biomass and production. However, within this longitudinal trend, hydrological mesoscale features exist and likely influence microbial dynamics. We show here the importance of mesoscale structures by a description of the structure and function of the microbial food web through an investigation of 3 geographically distant eddies within a longitudinal transect. Three selected sites each located in the center of an anticyclonic eddy were intensively investigated: in the Algero-Provencal Basin (St. A), the Ionian Basin (St. B), and the Levantine Basin (St. C). The 3 geographically distant eddies showed the lowest values of the different heterotrophic compartments of the microbial food web, and except for viruses in site C, all stocks were higher in the neighboring stations outside the eddies. During our study the 3 eddies showed equilibrium between GCP (Gross Community Production) and DCR (Dark Community Respiration); moreover, the west-east (W-E) gradient was evident in terms of heterotrophic biomass but not in terms of production. Means of integrated PPp values were higher at site B (~190 mg C m−2 d−1) and about 15% lower at sites A and C (~160 mg C m−2 d−1). Net community production fluxes were similar at all three stations exhibiting equilibrium between gross community production and dark community respiration.

Published
2011
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13. Microplanktonic Community Structure in a Coastal System Relative to a Phaeocystis Bloom Inferred from Morphological and Tag Pyrosequencing Methods

Author

Monchy, Sebastien, Grattepanche, Jean-david, Breton, Elsa, Meloni, Dionigia, Sanciu, Giovanna, Chabe, Magali, Delhaes, Laurence, Viscogliosi, Eric, Sime-ngando, Telesphore, Christaki, Urania, Monchy, Sebastien, Grattepanche, Jean-david, Breton, Elsa, Meloni, Dionigia, Sanciu, Giovanna, Chabe, Magali, Delhaes, Laurence, Viscogliosi, Eric, Sime-ngando, Telesphore, and Christaki, Urania

Abstract

Background: Massive phytoplankton blooms, like the recurrent Phaeocystis proliferation observed every year in the Eastern English Channel (EEC), have a significant influence on the overall planktonic community structure and their food web dynamics. As well as being an important area for local fisheries, the EEC is an ideal ecosystem for work on microbial diversity. This is because, although its environmental context is relatively complex, it is reasonably well understood due to several years of monitoring and morphological observations of its planktonic organisms. The objective of our study was to better understand the under-explored microbial eukaryotic diversity relative to the Phaeocystis bloom. Methodology and Principal Findings: The community structure of microplankton (diatoms, haptophytes, ciliates and dinoflagellates) was studied through morphological observations and tag pyrosequencing. During the annual Phaeocystis spring bloom, the phytoplankton biomass increased by 34-fold, while the microzooplankton biomass showed a 4-fold increase, representing on average about 4.6% of the biomass of their phytoplankton prey. Tag pyrosequencing unveiled an extensive diversity of Gymnodiniaceae, with G. spirale and G. fusiformis representing the most abundant reads. An extended diversity of Phaeocystales, with partial 18S rDNA genes sequence identity as low as 85% was found, with taxa corresponding to P. globosa, but also to unknown Phaeocystaceae. Conclusions: Morphological analyses and pyrosequencing were generally in accordance with capturing frequency shifts of abundant taxa. Tag pyrosequencing allowed highlighting the maintenance of microplankton diversity during the Phaeocystis bloom and the increase of the taxa presenting low number of reads (minor taxa) along with the dominant ones in response to biotic and/or abiotic changing conditions. Although molecular approaches have enhanced our perception on diversity, it has come to light that the challenge of modelling

Published
2012
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14. Microplanktonic Community Structure in a Coastal System Relative to a Phaeocystis Bloom Inferred from Morphological and Tag Pyrosequencing Methods

Author

Monchy, Sébastien, primary, Grattepanche, Jean-David, additional, Breton, Elsa, additional, Meloni, Dionigia, additional, Sanciu, Giovanna, additional, Chabé, Magali, additional, Delhaes, Laurence, additional, Viscogliosi, Eric, additional, Sime-Ngando, Télesphore, additional, and Christaki, Urania, additional

Published
2012
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