Evolutionary change in human-altered environments.

THOMAS B . SMITH*† and LOUIS BERNATCHEZ‡ *Center for Tropical Research, Institute of the Environment, University of California, Los Angeles, 619 Charles E. Young Dr East, Los Angeles, CA 90095-1496, USA, †Department of Ecology and Evolutionary Biology, University of California, Los Angeles, 621 Charles E. Young Dr South, Los Angeles, CA 90095-1606, USA, ‡Département de Biologie, Pavillon Charles-Eugène Marchand, Université Laval, Québec, QC, Canada G1K 7P4