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Batrachochytrium dendrobatidis  ( Bd ), a cutaneous amphibian fungus that causes the lethal disease chytridiomycosis, has been implicated as a cause of many amphibian declines.  Bd  can tolerate low temperatures with an optimum thermal range from 17–24°C. It has been shown that  Bd  infection may result in species extinction, avoiding the transmission threshold presented by density dependent transmission theory. Prevalence of  Bd  during autumn and winter has been shown to be as low as 0% in some species. It is currently unclear how  Bd  persists in field conditions and what processes result in carry-over between seasons. It has been hypothesised that overwintering tadpoles may host  Bd  between breeding seasons. The Great Barred Frog ( Mixophyes fasciolatus ) is a common, stable and widespread species in Queensland, Australia, and is known to carry  Bd . Investigation into  Bd  infection of different life stages of  M. fasciolatus  during seasonally low prevalence may potentially reveal persistence and carry-over methods between seasons. Metamorphs, juveniles, and adults were swabbed for  Bd  infection over three months (between March and May, 2011) at 5 sites of varying altitude (66 m–790 m). A total of 93 swabs were analysed using Polymerase Chain Reaction (PCR) real-time analysis. PCR analysis showed 6 positive (1 excluded), 4 equivocal and 83 negative results for infection with  Bd . Equivocal results were assumed to be negative using the precautionary principle. The 5 positive results consisted of 4 emerging (Gosner stage 43–45) metamorphs and 1 adult  M. fasciolatus . Fisher's exact test on prevalence showed that the prevalence was significantly different between life stages. All positive results were sampled at high altitudes (790 m); however prevalence was not significantly different between altitudes. Infection of emerging metamorphs suggests that individuals were infected as tadpoles. We hypothesise that  M. fasciolatus  tadpoles carry  Bd  through seasons. Thus,  Mixophyes fasciolatus  may act as disease reservoirs at multiple life stages.

Over-Wintering Tadpoles of Mixophyes fasciolatus Act as Reservoir Host for Batrachochytrium dendrobatidis