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dc.contributor.authorNarayan, Edwarden_US
dc.contributor.authorC. Molinia, Franken_US
dc.contributor.authorS. Christi, Ketanen_US
dc.contributor.authorG. Morley, Craigen_US
dc.contributor.authorF. Cockrem, Johnen_US
dc.contributor.editorR.M. Doresen_US
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.en_US
dc.publisher.placeUnited Statesen_US
dc.relation.ispartofjournalGeneral and Comparative Endocrinologyen_US
dc.subject.fieldofresearchComparative Physiologyen_US
dc.subject.fieldofresearchAnimal Physiology - Systemsen_US
dc.titleAnnual cycles of urinary reproductive steroid concentrations in wild and captive endangered Fijian ground frogs (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.hasfulltextNo Full Text
gro.griffith.authorNarayan, Edward J.

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