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dc.contributor.authorCattet, Marc
dc.contributor.authorStenhouse, Gordon B.
dc.contributor.authorBoulanger, John
dc.contributor.authorJanz, David M.
dc.contributor.authorKapronczai, Luciene
dc.contributor.authorSwenson, Jon
dc.contributor.authorZedrosser, Andreas
dc.date.accessioned2019-01-28T12:57:03Z
dc.date.available2019-01-28T12:57:03Z
dc.date.created2018-10-14T18:10:36Z
dc.date.issued2018
dc.identifier.citationConservation Physiology. 2018, 6 (1), .nb_NO
dc.identifier.issn2051-1434
dc.identifier.urihttp://hdl.handle.net/11250/2582642
dc.description.abstractAlthough combining genetic and endocrine data from non-invasively collected hair samples has potential to improve the conservation of threatened mammals, few studies have evaluated this opportunity. In this study, we determined if steroid hormone (testosterone, progesterone, estradiol and cortisol) concentration profiles in 169 hair samples collected from freeranging brown bears (Ursus arctos) could be used to accurately discriminate between immature and adult bears within each sex. Because hair samples were acquired opportunistically, we also needed to establish if interactions between hormones and several non-hormone factors (ordinal day, year, contact method, study area) were associated with age class. For each sex, we first compared a suite of candidate models by Akaike Information Criteria model selection, using different adult-age thresholds (3, 4 and 5 years), to determine the most supported adult age. Because hair hormone levels better reflect the endocrine state at an earlier time, possibly during the previous year, then at the time of sampling, we reanalysed the data, excluding the records for bears at the adult-age threshold, to establish if classification accuracy improved. For both sexes, candidate models were most supported based on a 3-year-old adult-age threshold. Classification accuracy did not improve with the 3-year-old bear data excluded. Male age class was predicted with a high degree of accuracy (88.4%) based on the concomitant concentrations of all four hormones. Female age class was predicted with less accuracy (77.1%) based only on testosterone and cortisol. Accuracy was reduced for females, primarily because we had poor success in correctly classifying immature bears (60%) whereas classification success for adult females was similar to that for males (84.5%). Given the small and unbalanced sample used in this study, our findings should be viewed as preliminary, but they should also provide a basis for more comprehensive future studies.nb_NO
dc.description.abstractCan concentrations of steroid hormones in brown bear hair reveal age class?nb_NO
dc.language.isoengnb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleCan concentrations of steroid hormones in brown bear hair reveal age class?nb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.pagenumber20nb_NO
dc.source.volume6nb_NO
dc.source.journalConservation Physiologynb_NO
dc.source.issue1nb_NO
dc.identifier.doi10.1093/conphys/coy001
dc.identifier.cristin1620248
cristin.unitcode192,14,0,0
cristin.unitnameMiljøvitenskap og naturforvaltning
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Med mindre annet er angitt, så er denne innførselen lisensiert som Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal