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dc.contributor.authorNarayan, Edwarden_US
dc.contributor.authorF. Cockrem, Johnen_US
dc.contributor.authorHero, Jean-Marcen_US
dc.date.accessioned2017-05-03T15:44:19Z
dc.date.available2017-05-03T15:44:19Z
dc.date.issued2013en_US
dc.date.modified2013-11-20T22:53:35Z
dc.identifier.issn10956433en_US
dc.identifier.doi10.1016/j.cbpa.2013.03.033en_US
dc.identifier.urihttp://hdl.handle.net/10072/54412
dc.description.abstractRepeatability of physiological response variables, such as the stress hormone corticosterone, across numerous sampling occasions is an important assumption for their use as predictors of behaviour, reproduction and fitness in animals. Very few studies have actually tested this assumption in free-living animals under uncontrolled natural conditions. Non-invasive urine sampling and standard capture handling protocol have enabled the rapid quantification of baseline corticosterone and short-term corticosterone stress responses in anuran amphibians. In this study, established non-invasive methods were used to monitor physiological stress and urinary testosterone levels in male individuals of the terrestrial breeding Fijian ground frog (Platymantis vitiana). Adult male frogs (n = 20) were sampled at nighttimes on three repeated occasions at intervals of 14 days during their annual breeding season on Viwa Island, Fiji. All frogs expressed urinary corticosterone metabolite responses to the capture and handling stressor, with some frogs showing consistently high urinary corticosterone responses than others. Ranks of corticosterone values at 0, 4 and 8 h, and the corrected rank were highly significant (r = 0.75 - 0.99) between the three repeated sampling occasions. Statistical repeatabilities were high for baseline corticosterone (r = 0.973) and for corticosterone values at 2 h (r = 0.862), 4 h (r = 0.861), 6 h (r = 0.820) and 8 h (r = 0.926), and also for the total (inclusive of baseline corticosterone values) and the corrected integrated responses (index of the acute response) [r = 0.867 and r = 0.870]. Urinary testosterone levels also showed high statistical repeatability (r = 0.78). Furthermore, variation in baseline and short-term corticosterone stress responses was greater between individuals than within individuals. Baseline urinary corticosterone was significantly negatively correlated with the corrected integrated corticosterone response (r = -0.3, p < 0.001) but non-significantly with body-condition (r = -0.04) and baseline urinary testosterone (r = -0.07). While, the corrected integrated corticosterone response was positively correlated (non-significantly) with baseline urinary testosterone (r = +0.04) and body-condition (r = +0.08). Urinary testosterone levels and body-condition were significantly negatively correlated (r = -0.23, p < 0.001). The results suggest that male frogs with higher levels of testosterone could have depleted energy reserve during the breeding period. The acute corticosterone responses help in replenishing energy that is needed for breeding and survival. The results also provide some support to the 'cort-fitness' hypothesis as highlighted by the negative correlation between baseline corticosterone and body-condition. It is most likely that the acute corticosterone response is adaptive and linked positively with reproductive fitness and survival in male anurans.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_US
dc.format.extent853118 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.publisherElsevieren_US
dc.publisher.placeUnited Statesen_US
dc.relation.ispartofstudentpublicationNen_US
dc.relation.ispartofpagefrom304en_US
dc.relation.ispartofpageto312en_US
dc.relation.ispartofissue2en_US
dc.relation.ispartofjournalComparative Biochemistry and Physiology. Part A: Molecular & Integrative Physiologyen_US
dc.relation.ispartofvolume165en_US
dc.rights.retentionYen_US
dc.subject.fieldofresearchComparative Physiologyen_US
dc.subject.fieldofresearchcode060604en_US
dc.titleRepeatability of baseline corticosterone and short-term corticosterone stress responses, and their correlation with testosterone and body condition in a terrestrial breeding anuran (Platymantis vitiana)en_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.facultyGriffith Sciences, Griffith School of Environmenten_US
gro.rights.copyright© 2013 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.en_US
gro.date.issued2013
gro.hasfulltextFull Text


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