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dc.contributor.authorNarayan, Edward
dc.contributor.authorC. Molinia, Frank
dc.contributor.authorS. Christi, Ketan
dc.contributor.authorG. Morley, Craig
dc.contributor.authorF. Cockrem, John
dc.contributor.editorR.M. Dores
dc.date.accessioned2017-05-03T15:44:14Z
dc.date.available2017-05-03T15:44:14Z
dc.date.issued2010
dc.date.modified2011-03-22T07:05:34Z
dc.identifier.issn00166480
dc.identifier.doi10.1016/j.ygcen.2009.10.003
dc.identifier.urihttp://hdl.handle.net/10072/37514
dc.description.abstractAnnual cycles of reproductive steroid metabolites were measured in urine collected from free-living and captive tropical endangered Fijian ground frogs (Platymantis vitiana) a terrestrial breeding. Free-living frogs were sampled on Viwa Island, Fiji and captive frogs were maintained in an outdoor enclosure in Suva, Fiji. Urinary estrone, progesterone and testosterone metabolite concentrations increased in male and female frogs after hCG challenges, with clear peaks in steroid concentrations 2 or 3 days after the challenges. There were annual cycles of testosterone metabolites in wild and captive males, and of estrone and progesterone metabolites in wild and captive females. Peaks of steroid concentrations in the wet season corresponded with periods of mating and egg laying in females in December and January. Steroid concentrations declined in January and February when maximum egg sizes in females were also declining. Body weights of wild male and vitellogenic female frogs showed annual cycles. Body weights of non-vitellogenic female frogs varied significantly between months, although there was no clear pattern of annual changes. Body weights of the 3 captive male frogs and 4 captive female frogs were similar to those of the wild frogs. Estrone metabolites were 80% successful in identifying non-vitellogenic females from males. The results suggest that the Fijian ground frog is a seasonal breeder with an annual gonadal cycle, and this species is likely to be photoperiodic. Urinary steroid measurements can provide useful information on reproductive cycles in endangered amphibians.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeUnited States
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom172
dc.relation.ispartofpageto179
dc.relation.ispartofissue1
dc.relation.ispartofjournalGeneral and Comparative Endocrinology
dc.relation.ispartofvolume166
dc.rights.retentionY
dc.subject.fieldofresearchComparative Physiology
dc.subject.fieldofresearchAnimal Physiology - Systems
dc.subject.fieldofresearchPhysiology
dc.subject.fieldofresearchZoology
dc.subject.fieldofresearchVeterinary Sciences
dc.subject.fieldofresearchcode060604
dc.subject.fieldofresearchcode060603
dc.subject.fieldofresearchcode0606
dc.subject.fieldofresearchcode0608
dc.subject.fieldofresearchcode0707
dc.titleAnnual cycles of urinary reproductive steroid concentrations in wild and captive endangered Fijian ground frogs (Platymantis vitiana)
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, Griffith School of Environment
gro.date.issued2010
gro.hasfulltextNo Full Text
gro.griffith.authorNarayan, Edward J.


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