Effect of delayed reporting of band recoveries on survival estimates

摘要: Brownie et al. (U.S. Fish and Wildl. Serv., Resource Publ. 131, 1978) presented 14 models based on an array of explicit assumptions for the study survival in avian populations. These methods are replacing life table previously used to estimate rates (e.g., Burnham Anderson, J. Manage., 43: 356-366, 1979). The new allow or recovery rates, both, be constant, timespecific, timeand age-specific. In studies birds data often from recoveries shot found dead during hunting season reported Bird Banding Laboratory by sportsmen, conservation agency employees, general public. This note examines bias estimating annual due a proportion being incorrectly year late. Specifically, few each of, example, adult male American Widgeon (Anas americana) banded California as recovered i + 1 when fact they were actually previous i. Delayed reporting might typically caused people finding band their heavy clothing fall and, embarrassed about failure report it was taken, late not mentioning actual recovery. Heuristically, delayed should estimated upwards because appears that corresponding "delayed" lived additional year.