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Amphibian DeclinesThe Conservation Status of United States Species$
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Michael Lannoo

Print publication date: 2005

Print ISBN-13: 9780520235922

Published to California Scholarship Online: March 2012

DOI: 10.1525/california/9780520235922.001.0001

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Monitoring Pigment Pattern Morphs of Northern Leopard Frogs

Monitoring Pigment Pattern Morphs of Northern Leopard Frogs

(p.328) Forty-Nine Monitoring Pigment Pattern Morphs of Northern Leopard Frogs
Amphibian Declines

Robert G. Mckinnell

David M. Hoppe

Beverly K. Mckinnell

University of California Press

Northern leopard frogs (Rana pipiens) are vulnerable to a herpesvirus-induced cancer of the mesonephros and burnsi differ little in susceptibility to the cancer compared with wild-type frogs. Ranid herpesvirus 1 is the etiological agent of the mesonephric cancer, and the virus is readily detectable in renal malignancies of burnsi frogs. This chapter reports the presence and distribution of the two pigment pattern variants of northern leopard frogs, burnsi and kandiyohi. It describes the capture and examination of 18,887 frogs. The rare burnsi and kandiyohi mutations have become polymorphic in Minnesota and its contiguous states. It is fair to ask if the frequency and distribution of pigment pattern morphs resulting from past mutation have any relevance to contemporary problems in amphibian population declines. Whether burnsi polymorphism is transient or balanced cannot be answered with the relatively few years' data available on frequencies.

Keywords:   Rana pipiens, northern leopard frogs, burnsi, kandiyohi, cancer, mesonephros, mutations, ranid herpesvirus 1, pigment, polymorphism

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