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Journal Article

Diagnostic Histological Findings in Yosemite Toads (Bufo canorus) from a Die-off in the 1970s

D. Earl Green and Cynthia Kagarise Sherman
Journal of Herpetology
Vol. 35, No. 1 (Mar., 2001), pp. 92-103
DOI: 10.2307/1566028
Stable URL: http://www.jstor.org/stable/1566028
Page Count: 12

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Topics: Toads, Amphibians, Toes, Infections, Histology, Population decline, Mortality, Death, Skin, Viruses
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Diagnostic Histological Findings in Yosemite Toads (Bufo canorus) from a Die-off in the 1970s
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Abstract

Twelve adult and 25 larval Yosemite toad (Bufo canorus) specimens from the eastern Sierra Nevada of California were examined histologically for evidence of infectious, toxicological, and degenerative diseases. The preserved toads were selected from 21 that had been salvaged or collected during a die-off in 1976-1979 that immediately preceded a population decline. Causes of death of four toads were determined histologically; clinical signs and field observations suggested causes of death of three more. Four toads died of infectious diseases, including chytridiomycosis of the skin (N = 1), bacillary septicemia (N = 2), and combined chytridiomycosis and bacterial septicemia (N = 1). Infections by a funguslike organism (Dermosporidium penneri), renal myxozoa (Leptotheca ohlmacheri), larval Rhabdias, various gastrointestinal nematodes, urinary bladder flukes, and lung flukes were detected in five specimens. No evidence of degenerative diseases, virus infections, or intoxications was found. The variety of lethal diseases and our inability to determine the causes of death of five specimens suggests that one or more histologically undetectable diseases or intoxications may have also contributed to the deaths and population decline.

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