Journal
AVIAN CONSERVATION AND ECOLOGY
Volume 10, Issue 1, Pages -Publisher
RESILIENCE ALLIANCE
DOI: 10.5751/ACE-00719-100103
Keywords
catchment areas; CMMN; feathers; migration monitoring; population trends; stable isotopes
Categories
Funding
- U.S. Fish and Wildlife Service Neotropical Migratory Bird Conservation Act
- Environment Canada
- Ontario Ministry of Natural Resources
- Bird Studies Canada
- Calgary Bird Banding Society
- Alberta Gaming and Liquor Commission biennial casino
- CMMN stations
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The Canadian Migration Monitoring Network (CMMN) consists of standardized observation and migration count stations located largely along Canada's southern border. A major purpose of CMMN is to detect population trends of migratory passerines that breed primarily in the boreal forest and are otherwise poorly monitored by the North American Breeding Bird Survey (BBS). A primary limitation of this approach to monitoring is that it is currently not clear which geographic regions of the boreal forest are represented by the trends generated for each bird species at each station or group of stations. Such information on catchment areas for CMMN will greatly enhance their value in contributing to understanding causes of population trends, as well as facilitating joint trend analysis for stations with similar catchments. It is now well established that naturally occurring concentrations of deuterium in feathers grown in North America can provide information on their approximate geographic origins, especially latitude. We used stable hydrogen isotope analyses of feathers (delta H-2(f)) from 15 species intercepted at 22 CMMN stations to assign approximate origins to populations moving through stations or groups of stations. We further constrained the potential catchment areas using prior information on potential longitudinal origins based upon bird migration trajectories predicted from band recovery data and known breeding distributions. We detected several cases of differences in catchment area of species passing through sites, and between seasons within species. We discuss the importance of our findings, and future directions for using this approach to assist conservation of migratory birds at continental scales.
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