Stage d’été en écologie comportementale et évolution.

Proposition de stage d’été en écologie comportementale et évolution.

stage yasminDSC012732-300x219Période : mi-juillet mi-aout (3-4 semaines selon disponibilités)

Lieu : Université Montpellier II, Institut des Sciences de l’Evolution de Montpellier http://www.isem.univ-montp2.fr/

J’étudie les comportements qui peuvent favoriser la spéciation (formation de nouvelles espèces), notamment les choix de partenaire et l’agressivité, chez la souris. Je propose un stage dont le but est de déterminer les préférences de femelles en fonction de la sous-espèce des males qui leur sont présentés, et du statut dominant/dominé de ces mâles.
Vous serez formés à la manipulation des souris, à la mise en place de protocoles expérimentaux, à l’étude des comportements, et à certains concepts d’évolution en fonction de vos intérêts.
Aucune compétence n’est pré-requise, mais sérieux et motivation sont nécessaires!

Contactez moi par mail yasmin.latour@gmail.com
Yasmin Latour (encadrante)
Responsable : Guila Ganem

Séminaire du lundi 24/06/13

ISEM OK vectoriseJonathan Romiguier, en post-doc
dans l’équipe Phylogénie & Evolution Moléculaires donnera
le séminaire de 11h: « Qu’est ce qui détermine la diversité génétique d’une espèce animale ?  Réponses des 421 transcriptomes du projet PopPhyl. »

SEEM EVOLUTION | BARRY SINERVO | VEN 21 JUIN 10H AU CEFE

Uta copy Barry SinervoBarry Sinervo
Climate forced reptile extinctions and new population viability analyses
contact : Ophélie Ronce

SEEM écologie, grande salle de réunion du CEFE
vendredi 21 juin à 10h

LABEx CeMEB

Barry Sinervo

Dept. of Ecology and Evolutionary Biology, UC Santa Cruz

 

 

Summary:

Climate models forecast species extinctions and distributional shifts in upcoming decades, but many predictions lack validation and thus are relatively uncertain. Sinervo et al. (Science May 2010) compared recent and historical surveys for lizards on five continents and presented a physiological model that predicted the extinctions with high accuracy (R2=0.72). We present new physiological measurements of operative model temperatures that validate the model for 3 of the original continental surveys. Furthermore, we validate the extinction model with new predictions and new extinction resurveys of several species of lizard in Europe, South, Central and North America (R2=0.86). Finally, I present a new more detailed mechanistic model, premised on Population Viability Analyses (PVA) of how climate impacts elements of the Leslie Matrix through physiological mechanisms of behavioral thermoregulation. I use contemporary demographic data on the Desert Tortoise, across the species range, and validate the PVA model with data on paleo-climate and the predicted fossil distribution going back 70 Million years. The new models are able to predict accurately the fossil distribution of tortoises across the last 70 million years of climate evolution, thus the dire extinction forecasts predicted by climate warming are likely to have high accuracy. I discuss how the models can be generalized to all ectothermic (reptiles, frogs, fish) and endothermic vertebrates (birds, mammals).
 

 

 

SEEM EVOLUTION | Helen Alexander | VENDREDI 21 JUIN A 11H30

ALEXANDER-HELENHelen Alexander, ETH Zürich
Emergence of viral drug resistance as a case of evolutionary rescue
Vendredi 21 juin à 11h30, Salle Louis Thaler (UM2, bat 22, 2e étage)
LABEx CeMEB

Summary:

« Evolutionary rescue » is a term used primarily in conservation biology to describe the situation in which genetic adaptation prevents extinction of a declining population.  This scenario arises, for example, in macro-organisms facing habitat destruction or climate change.  It also arises in micro-organisms and cell populations, including pathogens or cancerous tumors in a patient taking drug therapy.  The emergence of drug resistance, which can be seen as evolutionary rescue of a pathogen population facing severe environmental change, is a major problem in public health, compromising successful treatment of infections.  Here I will present new theoretical results on the within-host emergence of drug resistance in viruses.  We are particularly interested in whether rescue occurs from pre-existing (standing) genetic variation, or de novo mutation during therapy.  I will describe an extension of a widely-used viral dynamics model, which allows us to investigate the roles of viral « life history » and stochasticity.  The parameters playing a key role in determining rescue can be identified from analytical expressions.  Our results highlight the importance of life cycle details and competition between viral strains.  Finally, I will briefly discuss some links between the largely separate drug resistance and evolutionary rescue literature and the potential for greater integration between these fields.
contact : Sébastien Lion

SEEM Invité | Ashleigh Griffin | vendredi 7 juin

Ashleigh GriffinAshleigh Griffin, Department of Zoology, University of Oxford
Understanding when family matters: the evolution of kin discrimination

While we understand why relatedness is important for the evolution of social behaviour, we have mush weaker understanding of why its importance seems to vary dramatically between species. I will talk about my work on this question using examples from cooperative breeding, paternal care and inbreeding avoidance and maybe also from microbes.
11h, Amphithéâtre de la délégation CNRS, 1919 route de Mende