Age‐specific breeding probability in black brant: effects of population density

摘要: Summary 1. We estimated age-specific probability of breeding for black brant ( Branta bernicla nigricans Lawrence) (hereafter brant) at the Tutakoke River Colony, Alaska, during a series years in which local density and juvenile mortality both increased. use these analyses to examine demographic responses increased population density. 2. Estimates were based on Kendall & Nichols (1995) fulllikelihood modification Pollock’s (1982) robust design applied observations uniquely colour-banded brant. 3. Breeding varied with female age but not across years, indicating lack response Annual from 0·67 ∠ 0·042 2-year-old females 0·90 0·024 5 old or older. 4. males ♢ was 0·78 0·03. Lower compared probably reflects dispersal whose mates died. 5. survival appears be general large herbivorous birds mammals, while changes adult reproductive investment may more variable.