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2016 Season Summary

posted Jun 15, 2017, 4:22 PM by Web master
The 2016 count was the 34th consecutive season of monitoring diurnal raptor and turkey vulture migration at the mouth of the Detroit River, and the 19th year of consistent coverage at Lake Erie Metropark. There were 635.5 hours of data collection with counts conducted on 89 days between 1 September and 30 November. A total of 65,398 raptors and turkey vultures of fifteen species were counted. We compared this season’s counts of individuals for each species to the respective long-term average (LTA) for each species since 1998. Only merlins (Falco columbarius) were counted within a 15 percent deviation from the LTA, which we considered to be the ‘approximately average’ zone. The total number of individuals counted for all other species that we observed this season was at least 15 percent less than the respective LTA, which we considered to be ‘below average’. The species that were counted in below average numbers were turkey vulture (Cathartes aura), bald eagle (Haliaeetus leucocephalis), northern harrier (Circus cyaneus), sharp-shinned hawk 
(Accipiter striatus), red-shouldered hawk (Buteo lineatus), broad-winged hawk (Buteo platypterus), red-tailed hawk (Buteo jamaicensis), golden eagle (Aquila chrysaetos), American kestrel (Falco sparverius), peregrine falcon (Falco peregrinus), Cooper’s hawk (Accipiter cooperii), northern goshawk (Accipiter gentilis), rough-legged hawk (Buteo lagopus), and osprey (Pandion haliaetus). Unlike the previous seven seasons, no Swainson’s hawks were counted this season. The full report can be accessed below:
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Web master,
Jun 15, 2017, 4:22 PM
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