The proximate cause of frog declines?

Ines Di Rosa, Francesca Simoncelli, Anna Fagotti and Rita Pascolini
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Ines Di Rosa: Università di Perugia, Via Pascoli 1
Francesca Simoncelli: Università di Perugia, Via Pascoli 1
Anna Fagotti: Università di Perugia, Via Pascoli 1
Rita Pascolini: Università di Perugia, Via Pascoli 1

Nature, 2007, vol. 447, issue 7144, E4-E5

Abstract: Abstract Arising from: J. A. Pounds et al. Nature 439, 161–167 (2006)10.1038/nature04246 ; Pounds et al. reply Pounds et al.1 argue that global warming contributes to amphibian declines by encouraging outbreaks of the chytrid fungus Batrachochytrium dendrobatidis. Although our findings agree with the climate-linked epidemic hypothesis1,2,3,4, this pathogen is probably not the only proximate factor in such cases: in the Trasimeno Lake area of Umbria in central Italy, for example, the water frog Rana lessonae first declined in the late 1990s, yet chytridiomycosis was not observed until 2003 (refs 5, 6). Here we show that the chytrid was common there throughout 1999–2002, in a previously unknown form that did not cause disease. We therefore think that the focus by Pounds et al. on a single pathogen is hard to justify because the host–parasite ecology is at present so poorly understood.

Date: 2007
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DOI: 10.1038/nature05941

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