Do Archival Light-Level Geolocators and Stable Hydrogen Isotopes Provide Comparable Estimates of Breeding-Ground Origin

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dc.contributor.authorHallworth, Michael T.
dc.contributor.authorStudds, Colin E.
dc.contributor.authorSillett, T. Scott
dc.contributor.authorMarra, Peter P.
dc.date.accessioned2019-03-13T14:15:40Z
dc.date.available2019-03-13T14:15:40Z
dc.date.issued2013-04-01
dc.description.abstractMigratory connectivity for small migratory passerines has been quantified primarily with stable hydrogen isotopes in feathers (δ²HF) 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 δ²HF 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 δ²HF 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 δ²HF 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 δ2HF 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 δ²HF.en_US
dc.description.sponsorshipThis research was supported by the James Bond Fund at the Smithsonian Institution (M.T.H. and P.P.M.), the U.S. National Science Foundation (P.P.M. and T.S.S.), and the Cosmos Club (M.T.H.). Ovenbird Breeding Bird Survey data were obtained from Patuxent Wildlife Research Center's Relative Abundance Shapefiles for Geographic Analyses webpage (www.mbr-pwrc.usgs.gov/bbs/shape_ral0.html).en_US
dc.description.urihttps://academic.oup.com/auk/article/130/2/273/5149359en_US
dc.format.extent10 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2v2bg-oaqw
dc.identifier.citationMichael T. Hallworth, Colin E. Studds, T. Scott Sillett, Peter P. Marra ,Do Archival Light-Level Geolocators and Stable Hydrogen Isotopes Provide Comparable Estimates of Breeding-Ground Origin, The Auk: Ornithological Advances, Volume 130, Issue 2, 1 April 2013, Pages 273–282, https://doi.org/10.1525/auk.2013.13037en_US
dc.identifier.urihttps://doi.org/10.1525/auk.2013.13037
dc.identifier.urihttp://hdl.handle.net/11603/13024
dc.language.isoen_USen_US
dc.publisherThe American Ornithologists' Unionen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Geography and Environmental Systems Department
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.subjectBayesianen_US
dc.subjectdeuteriumen_US
dc.subjectdiscriminationen_US
dc.subjectmigratory birden_US
dc.subjectOvenbirden_US
dc.subjectSeiurus aurocapillaen_US
dc.subjectsolar geolocatoren_US
dc.subjectstable isotopesen_US
dc.titleDo Archival Light-Level Geolocators and Stable Hydrogen Isotopes Provide Comparable Estimates of Breeding-Ground Originen_US
dc.title.alternativeDo Archival Light-Level Geolocators and Stable Hydrogen Isotopes Provide Comparable Estimates of Breeding-Ground Origin?en_US
dc.typeTexten_US

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