CNRS - Ecole Normale Supérieure, Paris
Le vendredi 10 mars 2017 - 11h30 Grande Salle CEFE (1919 Rte de Mende, 1e étage, aille C)
(Seminar in English)
Contact: Fabien Condamine
CNRS – Université de Lille (France)
Le vendredi 20 janvier 2017 - 11h30 Grande Salle CEFE (1919 Rte de Mende, 1e étage, aille C)
Self-incompatibility in plants of the Brassicaceae family is controlled by a highly diversified molecular lock-and-key system consisting of a large set of specific haplotypic combinations of two tightly linked genes. This system has been a textbook example of natural (balancing) selection, in the form of a strong reproductive advantage for individuals expressing rare alleles. These haplotypes also form a striking linear dominance/recessivity hierarchy, whereby most heterozygote combinations express only one self-incompatibility specificity at the phenotypic level. The question of how so many lock-and-key combinations could arise in the first place and then establish such a complex network of dominance/recessivity interactions raises a series of interesting theoretical and mechanistic problems. In this presentation, I will detail how we are currently using this simple and experimentally tractable biological system to provide insight into the broader issue of how functional and regulatory novelty can arise in natural populations.
Durand E, Méheust R, Soucaze M, Goubet PM, Gallina S, Poux C, Fobis-Loisy I, Gaude T, Sarrazin A, Figeac M, Prat E, Marande W, Bergès H, Vekemans X, Billiard S, Castric V. 2014. Dominance hierarchy arising from the evolution of a complex small RNA regulatory network. Science 346: 1200-1205.
Castric, V., Billiard, S. & Vekemans, X. (2014) Trait transitions in explicit ecological and genomic contexts: plant mating systems as case studies. in: Ecological Genomics - Ecology and the Evolution of Genes and Genomes (ed. by C.R. Landry and N. Aubin-Horth), pp. 7–36. Springer.
Contact: Sylvain Gandon
le 21/10 et 28/10
British Antarctic Survey, Cambridge, UK
Le vendredi 9 décembre 2016 - 11h30 Grande Salle CEFE (1919 Rte de Mende, 1e étage, aille C)
(Seminar in English)
Global declines of albatrosses and large petrels have been attributed to incidental mortality (bycatch) in fisheries, but without detailed information on demography and distribution, it is rarely possible to determine which component of populations are at particular risk, and where to target conservation efforts. Tracking data provide an essential tool for identifying the areas and times of greatest overlap and hence risk of interaction with particular fisheries. This talk will examine the threat posed by bycatch and, using the wandering albatross population at South Georgia as a case study, highlight the ways in which tracking, demographic and fisheries datasets can be integrated to understand the scale of the bycatch problem and the potential solutions.
Phillips, R.A., Gales, R., Baker, G.B., Double, M.C., Favero, M., Quintana, F., Tasker, M.L., Weimerskirch, H., Uhart, M., and Wolfaardt, A. (2016) The conservation status and priorities for albatrosses and large petrels. Biological Conservation 201, 169-183.
Jiménez, S., Domingo, A., Brazeiro, A., Defeo, O., Wood, A.G., Froy, H., Xavier, J.C. and Phillips, R.A. (2016) Sex-related variation in the vulnerability of wandering albatrosses to pelagic longline fleets. Animal Conservation 19, 281-295.
Tancell, C., Sutherland, W.J and Phillips, R.A. (2016) Marine spatial planning for the conservation of albatrosses and large petrels breeding at South Georgia. Biological Conservation 198, 165-176.
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