Plasma Testosterone Concentrations in Adult Tree Swallows During the Breeding Season

dc.contributor.author Staley, Molly
dc.contributor.author Vleck, Carol
dc.contributor.author Vleck, Carol
dc.contributor.author Vleck, David
dc.contributor.department Ecology, Evolution and Organismal Biology
dc.date 2018-02-17T17:39:24.000
dc.date.accessioned 2020-06-30T02:19:17Z
dc.date.available 2020-06-30T02:19:17Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2011
dc.date.issued 2011-09-01
dc.description.abstract <p>We studied seasonal profiles of circulating testosterone concentrations among male and female adult Tree Swallows (<em>Tachycineta bicolor</em>) breeding in nest-box colonies near Ames, Iowa, USA. Mean plasma testosterone in males was elevated during nest establishment (0.63 ± 0.86 ng/ml) and incubation stages (0.28 ± 0.26 ng/ml), and was significantly lower after hatching (0.03 ± 0.05 ng/ml) when males began provisioning nestlings. Male swallows do not incubate and high testosterone during the incubation stage may facilitate pursuit of extra-pair matings. Female testosterone concentrations were an order of magnitude lower than those of males (nest establishment, mean  =  0.06 ± 0.09 ng/ml) and did not change significantly over the breeding season. These testosterone profiles support the hypothesis that elevated testosterone in males is associated with defense behaviors and obtaining additional mating opportunities during the first part of the breeding season, but is incompatible with parental care once the eggs have hatched.</p>
dc.description.comments <p>This article is from <em>The Wilson Journal of Ornithology </em>123 (2011); 608, doi: <a href="http://dx.doi.org/10.1676/10-142.1" target="_blank">10.1676/10-142.1</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/eeob_las_pubs/14/
dc.identifier.articleid 1015
dc.identifier.contextkey 8667081
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath eeob_las_pubs/14
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/23365
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/eeob_las_pubs/14/0-Wilson_ornithological_society_permission.pdf|||Fri Jan 14 20:09:05 UTC 2022
dc.source.bitstream archive/lib.dr.iastate.edu/eeob_las_pubs/14/2011_Vleck_PlasmaTestosterone.pdf|||Fri Jan 14 20:09:06 UTC 2022
dc.source.uri 10.1676/10-142.1
dc.subject.disciplines Ornithology
dc.subject.disciplines Population Biology
dc.subject.disciplines Terrestrial and Aquatic Ecology
dc.subject.disciplines Zoology
dc.title Plasma Testosterone Concentrations in Adult Tree Swallows During the Breeding Season
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 802c63cc-04db-40de-8dea-32f0b76f7197
relation.isOrgUnitOfPublication fb57c4c9-fba7-493f-a416-7091a6ecedf1
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