Affiliation: | NERC Centre for Population Biology and Department of Biological Sciences, Imperial College, Silwood Park, Ascot SL5 7PY, UK; Parks &Wildlife Commission of the Northern Territory, PO Box 496, Palmerston 0831, Australia; INRA, Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, CS 30016, 34988 Montferrier-sur-Lez, France |