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Seasonal and population variation in male testosterone levels in breeding orange-crowned warblers (Vermivora celata)

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dc.contributor.author Horton, Brent M. en
dc.contributor.author Yoon, Jongmin en
dc.contributor.author Ghalambor, Cameron K. en
dc.contributor.author Moore, Ignacio T. en
dc.contributor.author Sillett, T. Scott en
dc.date.accessioned 2010-12-13T18:21:21Z
dc.date.available 2010-12-13T18:21:21Z
dc.date.issued 2010
dc.identifier.citation Horton, Brent M., Yoon, Jongmin, Ghalambor, Cameron K., Moore, Ignacio T., and Sillett, T. Scott. 2010. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F11635">Seasonal and population variation in male testosterone levels in breeding orange-crowned warblers (Vermivora celata)</a>." <em>General and Comparative Endocrinology</em>. 168 (3):333&ndash;339. <a href="https://doi.org/10.1016/j.ygcen.2010.04.019">https://doi.org/10.1016/j.ygcen.2010.04.019</a> en
dc.identifier.issn 0016-6480
dc.identifier.uri http://hdl.handle.net/10088/11635
dc.description.abstract Comparative hormone studies can reveal how physiology underlies life history variation. Here, we examined seasonal variation in plasma testosterone concentration between populations of male orange-crowned warblers {(Vermivora} celata) breeding in Fairbanks, Alaska {(V.} c. celata) and on Santa Catalina Island, California {(V.} c. sordida). These populations face different ecological constraints and exhibit different life histories. Alaska birds have a short breeding season, low annual adult survival, and high reproductive rates. In contrast, Catalina Island birds exhibit high adult survival and low reproductive rates despite having a long breeding season. We examined seasonal variation in male testosterone concentrations as a potential mechanism underlying differences in male reproductive strategies between populations. From 2006-2008, we sampled males during the pre-incubation, incubation, and nestling stages. Alaska males exhibited a seasonal testosterone pattern typical of northern passerines: testosterone levels were high during pre-incubation and declined during incubation to low levels during nestling provisioning. Testosterone concentrations in Catalina Island males, however, did not vary consistently with breeding stage, remained elevated throughout the breeding season, and were higher than in Alaska males during the nestling stage. We hypothesize that in Alaska, where short seasons and high adult mortality limit breeding opportunities, the seasonal testosterone pattern facilitates high mating effort prior to incubation, but high parental investment during the nestling stage. On Catalina Island, elevated testosterone levels may reflect the extended mating opportunities and high population density facing males in this population. Our results suggest that population variation in seasonal testosterone patterns in orange-crowned warblers may be a function of differences in life history strategy and the social environment. en
dc.relation.ispartof General and Comparative Endocrinology en
dc.title Seasonal and population variation in male testosterone levels in breeding orange-crowned warblers (Vermivora celata) en
dc.type Journal Article en
dc.identifier.srbnumber 92187
dc.identifier.doi 10.1016/j.ygcen.2010.04.019
rft.jtitle General and Comparative Endocrinology
rft.volume 168
rft.issue 3
rft.spage 333
rft.epage 339
dc.description.SIUnit NZP en
dc.citation.spage 333
dc.citation.epage 339

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