Edward Narayan

Annual Assessment of Chytrid Fungus Prevalence amongst Endangered Native Fijian Ground Frog Populations on Viwa – Fiji Islands

Fijian ground frog close-up shot.

Standard technique for taking swab sample for chytrid fungus demonstrated using a Fijian ground frog.

Fijian ground frog.

Viwa IslandFijiAmphibians, Australasia16 Nov 2009

During the past three decades, a number of amphibian populations have undergone severe declines, some of which have resulted in extinction (Blaustein and Wake, 1990; Pimm et al., 1995; Stuart et al., 2004). Globally, many of these declines have been linked to the emergence of chytridiomycosis, a disease caused by the recently discovered fungal pathogen Chytrid fungus Batrachochytrium dendrobatidis (Berger et al., 1998; Daszak et al., 2003; Kriger and Hero, 2007; Hero and Morrison, 2003). New Zealand's first case of this disease, Chytridiomycosis, was diagnosed in a population of golden bell frogs Litoria raniformis (Waldman, 2001).

The high prevalence of Chytrid fungus in Australia and New Zealand and its prevalence in cool and moist habitats are strong indicators for investigating the prevalence of this disease within isolated natural frog populations in Fiji Islands. Currently, chytridiomycosis is the only explanation, for which supporting evidence is available, for the global ‘‘enigmatic’’ declines and disappearances of frog populations and species (Skerratt et al., 2007). The discovery of Chytrid fungus in native Fijian ground frog (Platymantis vitiana) populations in Fiji Islands could be the major missing piece of the conservation puzzle solving the cause of recent native frog population declines in Fiji Islands.

To read about Edward's previous work http://www.ruffordsmallgrants.org/rsg/projects/edward_narayan or for more information contact edward_nryn@yahoo.com

Project Update: September 2010

Field sampling has been completed on the selected natural habitat sites of the endangered Fijian ground frog (P. vitiana) near ponds, forested landscape and agricultural areas on Viwa Island, a 60 ha island 900 m east off the coast of mainland Viti Levu. We have sampled adult Fijian ground frogs frogs (n =100) along 100 m transects (n = 6) with each selected natural habitat and capturing at least 10 adult P. vitiana per transect. Swab samples are currently being analysed at our collaborated EcoGene laboratories in New Zealand for the presence/absence and quantification of chytrid fungus spores from the Fijian ground frog samples.

Final Report

Read more about the activities undertaken and findings of this project in the final reports below.

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Final Report690.5 KB
Detailed Final Report231.5 KB
Booster Grant Awarded

Read about Edwards latest work with Fijian Ground Frogs http://www.ruffordsmallgrants.org/rsg/projects/edward_narayan_1

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