Age determination and population structure in Missouri bullfrogs
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"Detailed studies of the life history of the bullfrog (Rana catesbeiana Shaw) in Missouri were initiated by Moyle (1952). He investigated phenology of emergence, call, breeding, transformation, and hibernation; mobility, and growth rates of bullfrogs and bullfrog tadpoles. Later, Willis (1954) studied breeding and transformation of bullfrogs. Ho also Investigated methods of determining age of bullfrogs; although one method seemed promising, he concluded that further work was necessary. Population studies of amphibians have often been severely handicapped by the lack of adequate techniques for aging, as several authors (Cagle, 1956; Turner, 1962) have pointed out. The purposes of the present study were to develop an adequate technique for determination of age of bullfrogs, and to analyze age and growth of several populations. An additional objective was to study the testicular cycle of Missouri bullfrogs end to relate it to the ovarian cycle as described by Willis, Moyle, and Baskett (1956)."--Introduction.
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