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<font size=3>Please find below information on 2 positions ( postdoc 2
Years and <br>
PhD 3 Years) available in the team "Plankton Evolution and
Paleoceans" at <br>
the Roscoff Marine Station, France.<br>
Research Themes: Marine Molecular Ecology, Plankton Ecology and
Evolution, <br>
Phylogenetics, Functional Genomics, Biomineralization, Paleontology and
<br>
Paleoceanography, Earth System Science.<br>
Just have a look at the attached document for more information, but do
not <br>
hesitate to email Colomban de Vargas (vargas@sb-roscoff.fr) if any
further <br>
questions.<br><br>
</font><font face="Arial, Helvetica" size=3>Roscoff, April 4th
2006,<br>
Station Biologique de Roscoff<br>
CNRS, UMR 7144, Groupe Plancton Oceanique<br>
Equipe ATIP : « Evolution du Plancton et Paleoceans »<br>
<a href="http://www.sb-roscoff.fr/Phyto/" eudora="autourl">http://www.sb-roscoff.fr/Phyto/</a><br>
CONCERNS: Two positions (PhD 3 Years $ PostDoc 2 Years) available at
the<br>
Roscoff Marine Station; Team: “Plankton Evolution and
Paleoceans”.<br><br>
The group “Plancton Oceanique” at the SBR in Brittany, France, is a one
of the world leader in the fields of molecular ecology, evolution, and
physiology of marine unicellular plankton
(<a href="http://www.sb-roscoff.fr/Phyto/" eudora="autourl">http://www.sb-roscoff.fr/Phyto/</a>).
The new team “Plankton Evolution and Paleoceans” (PI: Colomban de Vargas;
Research Engineer: Ian Probert; PhD students: Miguel Frada and Hui Liu)
explores key aspects of the biological, functional, and ecological
diversities within the two main groups of pelagic micro-calcifiers: the
coccolithophores and foraminifers. Having built kilometers-thick,
exceptionally well preserved carbonate deposits at the ocean floor, these
protists have played a fundamental role in the ecology and geology of
Earth System for the last ~200 My. The biological (genomic,
physiological, ecological, biogeographical), chemical (trace elements and
isotopes within the micro-skeletons), and morphological (optical and
electron microscopy) information we extract from living species are used
to assess their mode and rate of evolution, and to re-interpret their
fossil record and impact on biogeochemical cycles.<br><br>
</font><font face="Arial, Helvetica" size=3><b>PhD project: Role of
</font><font face="Arial, Helvetica" size=3><i>Red-Queen
</i></font><font face="Arial, Helvetica" size=3>selection, life cycle,
and sex in the evolution of marine pelagic viruses and their hosts
(coccolithophores).<br><br>
</b></font><font face="Arial, Helvetica" size=2>This project will be
co-supervised by Colomban de Vargas (SBR) and Willie Wilson (Plymouth
Marine Laboratory, http://www.pml.ac.uk/pml/). It is part of
</font><font face="Arial, Helvetica" size=2><b><i>ESTeam</i></b></font><font face="Arial, Helvetica" size=2>,
a new European PhD program of excellence in marine genomics and molecular
ecology, hosted at the SBR
(</font><a href="http://www.sbroscoff. fr/ESTeam/" eudora="autourl"><font face="Arial, Helvetica" size=2 color="#0000FF"><u>http://www.sbroscoff</a></u></font><a href="http://www.sbroscoff. fr/ESTeam/" eudora="autourl"><font face="Arial, Helvetica" size=2>.
fr/ESTeam/</a>).<br><br>
</font><font face="Arial, Helvetica" size=3>Project Abstract: Modern
optical and genomic techniques have revealed extremely abundant and
diverse marine planktonic viruses. Although the influence of viruses on
marine geochemical cycles (via the regulation of host populations), and
prokaryote evolution (via lateral gene transfer), is well recognized, the
processes creating and maintaining such huge oceanic viral diversity,
including its rate of evolution, are largely unknown. Mechanisms of
co-evolution between hosts and their viruses, where both are fighting to
respectively decrease and increase virulence, are certainly playing
critical roles. We propose to test two main hypotheses, using the
coccolithophore Emiliania huxleyi as model: (A) virulence in pelagic
host-virus interactions is highly specific, constrained by the boundaries
between species, sub-species, or strains; (B) virulence is not species
specific, but life-stages specific, and thus constrained by the sexual
alternation between haploid and diploid populations. Experiments will
test if “Red-Queen” processes are driving ecological/evolutionary
diversification in coccolithoviruses and their hosts, and will address
whether host evolution is driven by rapid genomic mutations, or rather by
genomic restructuring through haploidization and/or genetic recombination
associated with sex. Results will enhance our understanding of the nature
and tempo of evolution of planktonic host-virus interactions.<br><br>
</font><font face="Arial, Helvetica" size=2>The complete project can be
downloaded @:<br>
</font><font face="Arial, Helvetica" size=2 color="#0000FF"><a href="http://www.sb-roscoff.fr/ESTeam//Theses/ESTeam_DeVargas.pdf" eudora="autourl">http://www.sb-roscoff.fr/ESTeam//Theses/ESTeam_DeVargas.pdf<br><br>
</a></font><font face="Arial, Helvetica" size=2><i>Application
dealine</i></font><font face="Arial, Helvetica" size=2>: May
26</font><font face="Arial, Helvetica" size=1>th
</font><font face="Arial, Helvetica" size=2>2006;
</font><font face="Arial, Helvetica" size=2><i>Interviews</i></font><font face="Arial, Helvetica" size=2>:
June 15-16</font><font face="Arial, Helvetica" size=1>th
</font><font face="Arial, Helvetica" size=2>2006;
</font><font face="Arial, Helvetica" size=2><i>Starting
date</i></font><font face="Arial, Helvetica" size=2>: Fall 2006.
</font><font face="Arial, Helvetica" size=2><i>Salary</i></font><font face="Arial, Helvetica" size=2>:
1532,94 Euros net/month; in addition:
</font><font face="Arial, Helvetica" size=2><i>travel
allowance</i></font><font face="Arial, Helvetica" size=2>, 750 €/year;
</font><font face="Arial, Helvetica" size=2><i>mobility</i></font><font face="Arial, Helvetica" size=2>:
523,50 €/month; </font><font face="Arial, Helvetica" size=2><i>career
exploration</i></font><font face="Arial, Helvetica" size=2>: 2000
€/fellow. Further detail about the
</font><font face="Arial, Helvetica" size=2><i>ESTeam
</i></font><font face="Arial, Helvetica" size=2>program can be found @
<a href="http://www.sb-roscoff.fr/ESTeam/" eudora="autourl">http://www.sb-roscoff.fr/ESTeam/</a>.<br><br>
</font><font face="Arial, Helvetica" size=2><b>Application form can be
found @
</font><a href="http://www.sb-roscoff.fr/ESTeam/" eudora="autourl"><font face="Arial, Helvetica" size=2 color="#0000FF">http://www.sb-roscoff.fr/ESTeam/</a>
</font><font face="Arial, Helvetica" size=2>and will be sent, together
with a CV, a letter of motivation, and 2 recommendation letters, to
</font><font face="Arial, Helvetica" size=2 color="#0000FF"><i>houbin@sb-roscoff.fr</i></font><font face="Arial, Helvetica" size=2>,
i.e. Mrs Celine Houbin,
</font><font face="Arial, Helvetica" size=2><i>ESTeam
</i></font><font face="Arial, Helvetica" size=2>operational manager,
SBR/CNRS-UPMC, BP74, F-29682 cedex, FRANCE. A copy of the documents
should be emailed to the Dr. Colomban de Vargas,
</font><font face="Arial, Helvetica" size=3 color="#0000FF">vargas@sb-roscoff.fr</font><font face="Arial, Helvetica" size=2>;
Any questions? Do not hesitate to call: 00 33 2 98 29 25 28.<br><br>
</b></font><font face="Arial, Helvetica" size=3>CONCERNS</font><font face="Arial, Helvetica" size=3><b>:
2-Years PostDoc positions available at the
</font><font face="Arial, Helvetica" size=3><i>Roscoff Marine
Station</i></font><font face="Arial, Helvetica" size=3>; Team:
“</font><font face="Arial, Helvetica" size=3><i>Plankton Evolution and
Paleoceans</i></font><font face="Arial, Helvetica" size=3>”.<br><br>
</b></font><font face="Arial, Helvetica" size=3>Postdoctoral
Associate</font><font face="Arial, Helvetica" size=3><b>:
</font><font face="Arial, Helvetica" size=3><i>Species & Skeleton
Diversification in Coccolithophores<br><br>
</i></b></font><font face="Arial, Helvetica" size=2>The ‘invention’ of
intracellular biomineralization (or
</font><font face="Arial, Helvetica" size=2><i>coccolithogenesis</i></font><font face="Arial, Helvetica" size=2>)
in haptophyte microalgae ~200 Ma transferred the biological control of
carbonate chemistry from coastal waters to the open oceans. This new
microbial machinery controlling the rate of carbon transfer between the
atmosphere, ocean, and sediments, significantly contributed to buffer the
concentration of atmospheric
CO</font><font face="Arial, Helvetica" size=1>2
</font><font face="Arial, Helvetica" size=2>and stabilize long-term
climates on Earth. Today, the anthropogenic acidification of the oceans,
in combination with a secular increase in Mg/Ca ratio in oceanic waters
may threaten coccolithogenesis and thus have a profound, disruptive
effect on the global carbon cycle. However, very little is known about
the complexity of the genetic network underlying
</font><font face="Arial, Helvetica" size=2><i>calcification
</i></font><font face="Arial, Helvetica" size=2>in coccolithophores and
the evolution of this fundamental function within the astonishing
biodiversity and morphological complexity of the group (shaped over
billions of generations in separated lineages, different water masses and
succeeding oceans). Such information will be required in order to predict
the potential of pelagic calcification for acclimation and
adaptation.<br><br>
24-months research position is available in our lab to join a
pluridisciplinary research program aimed at understanding the biological
and functional diversities within the coccolithophores, and assessing the
rate of change of these diversities over time (project ANR BOOM,
Biodiversity of Open Ocean Microcalcifiers). The candidate will develop
part of the molecular axis within BOOM, with 3 main objectives: (1)
Identify and sequence the genes responsible for haptophyte
biomineralization within a few divergent model species; (2) analyze the
molecular evolution (clock, selection) of key “calcifying” genes across
the phylogeny of the haptophytes and coccolithophores; (3) explore a few
phylogenetic patterns at the genus and higher taxonomic levels (species
versus skeletons diversification), using “neutral” genetic markers.
Molecular analyses of the biological and functional diversities will be
compared and calibrated in time using the coccolithophore fossil record.
A skilled molecular biologist is required with sound laboratory skills
and an interest in the fields of phylogenetics, functional genomics, and
the evolution of marine plankton and Earth System. Experience in the
systematics of coccolithophores and/or haptophytes is desirable but not
essential. Hundreds of haptophyte strains cultured in our lab will be
available for this study, which will be integrated into collaborative
work in physiology, functional genomics, and
paleontology/paleoceanography performed in South of France, California,
Germany, and UK.<br><br>
</font><font face="Arial, Helvetica" size=3><b>An application letter and
resume should be directly sent to the Dr. Colomban de Vargas, e-mail:
</font><font face="Arial, Helvetica" size=3 color="#0000FF">vargas@sb-roscoff.fr</font><font face="Arial, Helvetica" size=3>;
Station Biologique de Roscoff, Place George Teissier, BP74; 29682 ROSCOFF
Cedex, FRANCE. </font><font face="Arial, Helvetica" size=2>Any questions?
Do not hesitate to email or call: 00 33 2 98 29 25 28.<br><br>
<br><br>
<br><br>
<br>
</b></font><x-sigsep><p></x-sigsep>
<font size=3>_________________________________________________<br>
</font><font size=2>Demetrio Boltovskoy<br>
Departamento Ecología, Genética y Evolución<br>
Facultad de Ciencias Exactas y Naturales<br>
Universidad de Buenos Aires<br>
C1428EHA Buenos Aires<br>
Argentina<br><br>
email: demetrio@ege.fcen.uba.ar<br>
<a href="http://biolo.bg.fcen.uba.ar/boltovs.htm" eudora="autourl">http://biolo.bg.fcen.uba.ar/boltovs.htm</a><br>
Phone: (54-11)4576-3310, (54-11)4576-3300, Ext. 248; Cel.: +54 9 11 5425
4511<br>
Fax: (54-11)4576-3384/4795-1518<br>
</font><font size=3>_________________________________________________<br><br>
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