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dc.contributor.authorNarayan, Edward
dc.contributor.authorF. Cockrem, John
dc.contributor.authorHero, Jean-Marc
dc.date.accessioned2017-05-03T15:44:19Z
dc.date.available2017-05-03T15:44:19Z
dc.date.issued2013
dc.date.modified2013-11-20T22:53:35Z
dc.identifier.issn10956433
dc.identifier.doi10.1016/j.cbpa.2013.03.033
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.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent853118 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeUnited States
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom304
dc.relation.ispartofpageto312
dc.relation.ispartofissue2
dc.relation.ispartofjournalComparative Biochemistry and Physiology. Part A: Molecular & Integrative Physiology
dc.relation.ispartofvolume165
dc.rights.retentionY
dc.subject.fieldofresearchComparative Physiology
dc.subject.fieldofresearchBiochemistry and Cell Biology
dc.subject.fieldofresearchPhysiology
dc.subject.fieldofresearchZoology
dc.subject.fieldofresearchcode060604
dc.subject.fieldofresearchcode0601
dc.subject.fieldofresearchcode0606
dc.subject.fieldofresearchcode0608
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)
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, Griffith School of Environment
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.
gro.date.issued2013
gro.hasfulltextFull Text
gro.griffith.authorHero, Jean-Marc
gro.griffith.authorNarayan, Edward J.


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