Factors Influencing Progress toward Ecological Speciation

1CNRS, UMR 7205, Museum National d’Histoire Naturelle, 45 Rue Buffon, CP50, 75005 Paris, France 2CIBIO/UP—Centro de Investigacao em Biodiversidade e Recursos Geneticos, Universidade do Porto, Campus Agrario de Vairao, R. Monte-Crasto, 4485-661 Vairao, Portugal 3 IBE—Institut de Biologia Evolutiva (UPF-CSIC), Universitat Pompeu Fabra, PRBB, Avenue Doctor Aiguader N88, 08003 Barcelona, Spain 4Department of Botany, 3165, University of Wyoming, 1000 East University Avenue Laramie, WY 82071, USA 5Redpath Museum and Department of Biology, McGill University, 859 Sherbrooke Street West Montreal, QC, Canada H3A 2K6