RECENT TRENDS IN COUNTS OF MIGRANT HAWKS FROM NORTHEASTERN NORTH-AMERICA

Using simple regression, pooled-sites route-regression, and nonparametric rank-trend analyses, the authors evaluated trends in counts of hawks migrating past 6 eastern hawk lookouts from 1972-1987. Bald eagle Haliaeetus leucocephalus, peregrine falcon Falco peregrinus, merlin F. columbarius, osprey Pandion haliaetus and Cooper's hawk Accipiter cooperii counts increased using route-regression and nonparametric methods. Northern harrier Circus cyaneus counts increased based on the nonparametric method but not the route-regression method. There were no consistent trends in counts of sharp-shinned hawks A. striatus, northern goshawks A. gentilis, red-shouldered hawks Buteo lineatus, red-tailed hawks B. jamaicensis rough-legged hawks B. lagopus and American kestrels F. sparverius. Broad-winged hawk B. platypterus counts declined based on the route-regression method. -from Authors