Survivorship of Pileated Woodpeckers in northeastern Oregon

Knowledge of the survival of the Pileated Woodpecker (Dryocopus pileatus) i s essential in managing viable populations of the species. In eight study a reas in northeastern Oregon, survivorship of adult Pileated Woodpeckers was 0.60 after 6 mo, 0.47 after 12 mo, and 0.35 after 18 mo. Of three juvenile s radio-tagged in late summer or fall, two survived to breed the next year. Of 13 juveniles radio-tagged as nestlings, 23-54% survived 3.5 mo. In thes e populations adult mortality exceeded recruitment of young into the breedi ng population. Survival may have been influenced by transmitter attachments , habitat quality, or annual variability in predation.