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Epizootiology of sixty-four amphibian morbidity and mortality events in the USA, 1996-2001

January 1, 2002

A total of 44 amphibian mortality events and 20 morbidity events were reviewed retrospectively. The most common cause of amphibian mortality events was infection by ranaviruses (Family: Iridoviridae). Ranavirus epizootics have abrupt onset and affect late-stage larvae and recent metamorphs. Mortality events due to ranavirus infections affected only widespread and abundant amphibian species, and there was a clear association with high population densities. Chytrid fungal infections accounted for seven mortality events in postmetamorphic anurans only. Chytrid epizootics are insidious and easily overlooked in the field. While both ranavirus and chytrid fungal epizootics were associated with > 90% mortality rates at affected sites, only the chytrid fungal infections were linked to multiple amphibian population declines. Three primitive fungal organisms in the newly erected clade, Mesomycetozoa, caused morbidities and mortalities in anurans and salamanders.

Citation Information

Publication Year 2002
Title Epizootiology of sixty-four amphibian morbidity and mortality events in the USA, 1996-2001
DOI 10.1111/j.1749-6632.2002.tb04400.x
Authors D. E. Green, K. A. Converse, Audra K. Schrader
Publication Type Article
Publication Subtype Journal Article
Series Title Annals of the New York Academy of Sciences
Series Number
Index ID 1003932
Record Source USGS Publications Warehouse
USGS Organization National Wildlife Health Center

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