期刊
AUK
卷 130, 期 2, 页码 273-282出版社
OXFORD UNIV PRESS INC
DOI: 10.1525/auk.2013.13037
关键词
Bayesian; deuterium; discrimination; migratory bird; Ovenbird; Seiurus aurocapilla; solar geolocator; stable isotopes
类别
资金
- James Bond Fund at the Smithsonian Institution
- U.S. National Science Foundation
- Cosmos Club
- Direct For Biological Sciences
- Division Of Environmental Biology [1114804, 1242563] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Division Of Environmental Biology [GRANTS:13954439, 1242508] Funding Source: National Science Foundation
Migratory connectivity for small migratory passerines has been quantified primarily with stable hydrogen isotopes in feathers (delta H-2(F)) because, until recently, we lacked the technology to track small organisms over long distances. Direct tracking of small passerines throughout the annual cycle is now possible with archival light-level geolocators. Our objective was to evaluate whether delta H-2(F) and geolocators produce similar breeding-origin assignments for the same individual birds sampled during the non-breeding season. We estimated breeding origin with geolocators and delta H-2(F) and validated those estimates using a population of Ovenbirds (Seiurus aurocapilla) from a known breeding location at Hubbard Brook Experimental Forest, New Hampshire. We also deployed geolocators on Ovenbirds in Jamaica and Florida during March 2010-2011. We performed stable hydrogen isotope analysis on feathers of birds whose geolocators we recovered (Jamaica: n = 9; Florida: n = 3). Probabilistic assignments of delta H-2(F) that accounted for regional variation in feather-isotope discrimination predicted breeding origins that agreed with kernel density estimates of origin derived from geolocators. By contrast, assignments of delta H-2(F) using the common assumption of a consistent feather-isotope discrimination across space predicted breeding origins that overlapped minimally with those from geolocators. Finally, Bayesian analyses that incorporated prior information of Ovenbird abundance across the breeding range yielded more accurate assignments for both site-independent and site-specific discrimination factors. Our findings suggest that creating more detailed feather isoscapes by increasing the number of validation locations and sampling underrepresented portions of species distributions could increase the accuracy of geographic assignments using delta H-2(F).
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