Demographic Characteristics of a Maine Woodcock Population and Effects of Habitat Management.

摘要: Abstract : A population of American woodcock (Scolopax minor) was studied on a 3,401-ha area the Moosehorn National Wildlife Refuge in northeastern Maine from 1976 through 1985. During 1976-83, 4 to 64 clearcuts were created each year, opening up large contiguous blocks forest. combination mist nets, ground traps, nightlighting techniques, and trained dogs used capture band 1,884 birds during first 5 years. Capture recapture data (totaling 3,009 observations) with both demographically closed open models estimate size and, for models, summer survival. Flying young, especially young males, represented greatest proportion all captures; analysis showed that males more prone than females. Male courtship began about 24 March usually when there still snow wooded areas. Males =>2 years old dominated singing grounds April but this situation changed first-year May. Singing shifted older established new soon after we initiated forest management. Many subdominant at despite an abundance unoccupied openings. Three hundred adult females captured except 1978, majority old. The year which female homing rate lowest (1979) preceded by largest number 1-year-old brood captures drought. Summer survival 1978 attributed 1979 had abnormally cool wet spring, poorest production young. ratios young-to-adult obtained could be predict our study area.