Status of nesting ospreys in Coastal Baja California, Sonora and Sinaloa, Mexico, 1977 and 1992-1993.

Abstract.--We used a double-sampling technique (air + sod surveys), with partial double coverage and an additional adjustment for lack of nesting synchrony in southern latitudes, to estimate the size of the osprey (Pandion haliaetus) nesting population in the investigation area in 1992-1993. The osprey population was previously overlooked in 1977 by the same authors, although their published findings were not adjusted for early or late nest missed. An estimated 810 [+ or -] 55 (95% C.I.) pairs were nesting at the time of the aerial view in 1977, but the population increased 68% to an