Dr. R�gis Ferri�re is Professor of Mathematical Ecology in the Department of Ecology at the Ecole Normale Superieure, Paris, France and Associate Professor of Evolutionary Ecology in the Department of Ecology and Evolutionary Biology at the University of Arizona, Tucson, USA.
Dr. Denis Couvet is Professor at Mus�um National d'Histoire Naturelle, Paris, France and Professor at the Ecole Polytechnique, Paris, France.