Abstract
ABSTRACT. Global climate cycles have been shown to influence demographic rates of birds at local scales, but few analyses have examined these effects at larger, regional scales. We examined the relationship of broad-scale climate indices to apparent survival of a subspecies of Swainson's Thrush (Catharus ustulatus) across a large portion of the subspecies' breeding range along the Pacific slope of North America. We developed 69 a priori Cormack-Jolly-Seber models to examine effects of El Nino—Southern Oscillation (ENSO), North Atlantic Oscillation, Pacific Decadal Oscillation, latitude, region, and residency status on survival. The most parsimonious model included an ENSO effect, a regional effect, and a residency effect on survival. The ENSO had a positive effect on survival probability, and the effect was consistent across the entire portion of the breeding range examined. Additional analyses of a posteriori models provided strong support for an effect of dry-season precipitation along the spring migrat...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
