Survival of greater white-fronted geese: Effects of year, season, sex, andbody condition

Information regarding the magnitude and variation in survival rates is nece ssary for understanding the causes of large changes in population size. We examined survival of greater white-fronted geese (Anser albifrons frontalis ) in the Pacific Flyway during 1979-82. The population declined by 75% in t he decade preceding our study but was stable during our investigation. Annu al survival of adults (0.749, SE = 0.045) was 7% higher than during an earl ier study. We developed a simple population model which suggests that recen t (1985-96) survival rates may be as much as 10% higher in adults than the 1979-82 rate, which corresponds to population increases observed since 1985 . Survival of adult females varied seasonally; monthly survival during a pe riod of winter when no hunting or migration occurred was higher (0.986, SE = 0.015) than monthly survival at other times (0.964, SE = 0.006). Survival of adult males varied among years and with a general seasonal trend invers e to that for females. An index of body condition was positively related to survival of adult females in fall and spring, but not for adult males or i mmature geese. Monthly survival of immatures was lower during their first h unting season (0.886, SE = 0.026) than during all subsequent seasons (0.963 , SE = 0.007). Annual survival of immatures beginning 1 October, immediatel y before the hunting season, was 0.471. Corresponding variations in surviva l rates, population numbers, and hunting regulations suggest that hunting m ay have influenced survival in this population of greater white-fronted gee se.