translate English to French: The geese arrive in early or mid-May and congregate on river islands where open water and exposed shorelines provide the only habitat for feeding during migration (Barry 1967; Boothroyd 1985, 1986).
Lorsque les oies arrivent au dÃ©but ou Ã la mi-mai, elles se rassemblent dans les Ã®les du fleuve Mackenzie oÃ¹ les eaux libres et le littoral exposÃ© constituent le seul habitat d'alimentation durant la migration (Barry, 1967; Boothroyd, 1985, 1986).