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      Recent Emergence of a Chytrid Fungal Pathogen in California Cascades Frogs (Rana cascadae).

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          Abstract

          The pathogenic fungus Batrachochytrium dendrobatidis (Bd) has been associated with global amphibian declines, but it is often difficult to discern the relative importance of Bd as a causal agent in declines that have already occurred. Retrospective analyses of museum specimens have allowed researchers to associate the timing of Bd arrival with the timing of past amphibian declines. Cascades frogs (Rana cascadae) have experienced dramatic declines in northern California, but it is not clear whether the onset of these declines corresponds to the arrival of Bd. We used quantitative real-time PCR assays of samples collected from museum specimens to determine historical Bd prevalence in the northern California range of Cascades frogs. We detected Bd in 13 of 364 (3.5%) Cascades frog specimens collected between 1907 and 2003, with the first positive result from 1978. A Bayesian analysis suggested that Bd arrived in the region between 1973 and 1978, which corresponds well with the first observations of declines in the 1980s.

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          Author and article information

          Journal
          Ecohealth
          EcoHealth
          Springer Nature America, Inc
          1612-9210
          1612-9202
          March 2017
          : 14
          : 1
          Affiliations
          [1 ] Department of Biology, California State Polytechnic University, Pomona, Pomona, CA, USA.
          [2 ] Department of Biology, San Francisco State University, San Francisco, CA, USA.
          [3 ] School of Biological Sciences, Washington State University, 14204 NE Salmon Creek Avenue, Vancouver, WA, 98686, USA. jonah.piovia-scott@wsu.edu.
          Article
          10.1007/s10393-016-1201-1
          10.1007/s10393-016-1201-1
          27957606
          9568ea4b-85ec-4dbf-979c-08f4bfed3a06
          History

          Klamath Mountains,Cascade Mountains,chytridiomycosis,museum specimen,quantitative PCR

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