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Since 28 jan 2005
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Recently published papers
File Icon Massana Stramenopiles ISME J 2014 (82)
File Icon Bendif barcoding Emiliania J Phycol 2014 (336)
File Icon Dunthorn - Metabarcoding of ciliates - MBE 2014 (133)
File Icon Carrier - Transcriptome Isochrysis - PLoS One 2014 (175)
File Icon Maat - Phaeocystis virus and lipids - Biogeosciences - 2013 (120)
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One year post doc position on Prasinovirus proteomics
News - Students and job offers

In the framework of the project REVIREC (funded by the French Research Agency), we offer a one year post doc poistion. The work proposed will combine genomic and structural approaches to improve our understanding of the “unknown diversity” in different phytoplankton virus models. The applicant will be in charge of the proteome analysis of viruses that infect the world widely distributed prasinophytes Micromonas, Ostreococcus, and Bathycoccus.

 

Last Updated ( Friday, 20 September 2013 )
 
Unveiling the mystery of "chameleon" cyanobacteria
Research - Recent publications

                                                      Some strains of marine Synechococcus are capable of "chromatic acclimation", that is to modify their light-figure_chameleon_cyanobacteria.jpgharvesting capacity to match the dominant color of their habitat. Thus, when grown in green light, these cyanobacteria can synthesize pigments that specifically catch this color, but when shifted to blue light they can, in less than a week, change their pigmentation to catch this new color. To harvest light, cyanobacteria use a sophisticated "antenna" (phycobilisomes) composed of a very complex assemblage of proteins and pigments. This is a modification in the pigment content of this antenna which allows these micro-organisms to adapt to changes in the ambient light color. 

 

In collaboration with three American teams, we have unveiled the molecular bases of this intriguing phenomenon (Shukla et al. 2012).  

Last Updated ( Monday, 11 February 2013 )
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A new type of symbiosis among marine planktonic microbes discovered
Research - Topics

This symbiosis was observed during the BISOPE cruise in 2004In the Ocean, planktonic photosynthesis allows atmospheric carbon fixation and is accomplished by microscopic algae which are either eukaryotic or prokaryotic. Some Bacteria and Archaea (Cyanobacteria) can fix atmospheric nitrogen, which confers to them a competitive advantage in the central areas of the oceans that are devoid of nutrients. The paper by Anne W. Thompson, Rachel A. Foster, Andreas Krupke, Brandon J. Carter, Niculina Musat, Daniel Vaulot, Marcel MM Kuypers, & Jonathan P. Zehr published in Science on September 21, 2012 (download pdf) describes a new type of symbiosis between a cyanobacterium that can fix nitrogen and a eukaryotic alga belonging to the prymnesiophytes, which cannot fix it. The cyanobacterium provides nitrogen to the alga, but as it is lacking a part of the photosynthetic apparatus and cannot fix carbon, it relies on the Eukaryote to get the carbon it needs for its growth. This type of planktonic symbiosis has never been observed before and none of the two partners have been isolated in the laboratory. This discovery underscores the potential importance of such associations among plankton. In contrast to coral symbioses, planktonic symbioses have been very little studied until now but could have a strong impact of mineral fluxes in central regions of the oceans.

Last Updated ( Friday, 12 October 2012 )
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A new EU project launched - MicroB3
Research - Projects

MicroB3

The three teams of the Plankton Group are participating in a new EU project called MicroB3 dedicated to the genomics and metagenomics of Marine Microbes. The startup meeting took place at Jacobs University in Bremen on Feb 1-3 2012.

 

The project’s main objectives are to create an integrative database, which is open to researchers worldwide and features many innovative tools for data analysis, and to develop a legal framework for genome-based environmental research. New biotechnological applications will also be identified.

32 partner institutions from 14 countries are participating in the project, which unites leading experts from eight disciplines and is coordinated by Frank Oliver Glöckner, Professor of Bioinformatics at Jacobs University.

Modern biotechnological processes, which utilize or modify genetic information, have been in use for many years. Their main areas of usage lie within agriculture, medical or pharmaceutical applications, and the food industry. The so-called “blue biotechnology”, which uses genetic information of marine organisms for biotechnology, is still considered new terrain: Only 1% of all biotechnology companies worldwide use marine ecosystem knowledge as a source (e.g. for innovative enzymatic functions).

The potential of blue biotechnology, however, is huge, since life in marine habitats and especially microbial communities shows an enormous biodiversity and thus a genetic diversity, which largely exceeds that of most terrestrial ecosystems. Yet, this diversity has hardly been explored.

 

Last Updated ( Friday, 03 February 2012 )
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ECODIM VII in Las Cruces, Chile - Jan 2012
Education - University

The whole crew - Las Cruces, ChileFront: Florencia, Kurt, Pancho, Rodrigo, Maria Jesus, MariLo, Felipe, FernandoBack : Osvaldo, Ger, Claudia, Yolaine, Carlos, Carla, Eric, Nocole, Marine, Priscilla, Marcia, Alvaro, Adriana, Sylvia, Nathalie and Peter

 

 

Daniel Vaulot participated in the VII ECODIM Course in Las Cruces, Chile.  This marine microbiology course that takes place every two years is attended by the 15 best graduate and post-graduates from Latin America in the field.  This year Chile, Argentina, Brazil, Uruguay, Colombia and Cuba were represented.  The course lasts 3 weeks and includes lectures, field trips, practicals as well as team research project. This year it was a great success with impressive students.  See you for the next edition in 2014....

Last Updated ( Saturday, 28 January 2012 )
 
Anne-Claire Baudoux - A new CNRS researcher in the Plankton Group
News - Announcements

anne-claire_baudoux_redimensionner.jpg

Anne-Claire Baudoux has been recruited in 2011 as a CNRS "Chargée de Recherche" and has started her new position in Roscoff on Oct 1, 2011. She is a member of the Diversity of Oceanic Plankton team, part of UMR 7144.

 

Anne-Claire's interest includes the diversity, the evolution, and the ecology of marine viruses, which infect phytoplankton and bacteria.  Her research focuses mainly on the interactions of viruses with their environment (both biotic and abiotic) and how these interactions affect the functioning of marine ecosystems.

 

A few years ago, Anne-Claire spent some times in Roscoff as a visiting post-doctoral fellow.

 

Publications of Anne-Claire

Last Updated ( Friday, 04 November 2011 )
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Les microalgues calcaires, témoins de l'acidification des océans
Research - Topics

LeCinq coccolithophoridés vus au microscope électronique à balayage  montrant les différences de... phytoplancton calcaire, maillon important du cycle du carbone océanique, apparait très sensible à l'acidification océanique. Une étude internationale impliquant notamment des chercheurs du CNRS montre que la sécrétion du squelette calcaire d'une espèce de microalgues : les coccolithophores, diminue quand les eaux marines deviennent plus acides, mais certaines souches hyper-calcifiées se sont adaptées aux milieux les plus corrosifs. Leurs résultats sont publiés dans la revue Nature du 4 aout 2011.

 

 

 

Cinq coccolithophoridés vus au microscope électronique à balayage montrant les différences de calcification existant au sein de la même espèce ici Emiliania huxleyi. © Luc Beaufort CNRS/CEREGE

 

 

  • Beaufort, L., Probert, I., de Garidel-Thoron, T., Bendif, E. M., Ruiz-Pino, D., Metzl, N., Goyet, C., Buchet, N., Coupel, P., Grelaud, M., Rost, B., Rickaby, R. E. M. & de Vargas, C. 2011. Sensitivity of coccolithophores to carbonate chemistry and ocean acidification. Nature 476:80-83 - pdf
Last Updated ( Saturday, 13 August 2011 )
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Campagne PARALEX en Rance
Research - Projects

 

 

Dans le cadre de l'ANR Paralex, les équipes DPO, BEDIM, Chimie Marine, et DIVCO mettent en commun leurs compétences pour identifier les parasites naturels d'Alexandrium dans des écosystèmes récemment contaminés par des microalgues invasives et toxiques afin de comprendre leur rôle dans la résilience et la stabilité des écosystèmes marins côtiers.

Le dinoflagellé Alexandrium
minutum est une microalgue planctonique susceptible de proliférer de façon importante pour  former des marées rouges.
La campagne 2011 permet de suivre en parallèle ces efflorescences en Penzé et en Rance où les différentes équipes se relaient de fin mai à mi-juillet 2011.

L'équipe Chimie Marine est en charge du suivi des conditions hydrologiques pendant la campagne et a installé un container-laboratoire à Plouër-sur-Rance pour des analyses in-situ, et déployé plusieurs instruments en Rance (capteurs).

Voir l'article paru dans Ouest-France

version pdf de l'article de Ouest France
version pdf de l'article du Télégramme
Article du Petit Bleu

Last Updated ( Saturday, 13 August 2011 )
 
Thesis defence - Daniella Mella-Flores - 9 June 2011
News - Announcements

Daniella Mella-Flores a défendu sa thèse de doctorat à la Station Biologique de Roscoff le Jeudi 9 Juin 2011 (Université de Paris 6). Son travail a porté sur l'étude de la Diversité Génétique et Fonctionnelle des Cyanobactéries Picoplanctoniques Marines. Elle s'est en particulier intéressée à la distribution écologique, la diversité génétique et la réponse physiologique à différents stress environnementaux chez les deux principaux genres de picocyanobactéries marines, Prochlorococcus et Synechococcus.

 

Daniella Mella-Flores defended her PhD thesis the 9th of June 2011 at the Station Biologique of Roscoff (University of Paris 6). She worked on the Genetic and Functional Diversity of Marine Picoplanktonic Cyanobacteria with a more specific focus on the study of the ecological distribution, the genetic diversity and the physiological responses to different stress conditions of the two main genera of marine cyanobacteria, Prochlorococcus and Synechococcus.

 

 

daniella_thesis_2011.jpg

 

 


 

Last Updated ( Thursday, 23 June 2011 )
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