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Electrophoretic Phenotypes of Rana ridibunda, Rana lessonae, and Their Hybridogenetic Associate, Rana esculenta

Thomas Uzzell and Leszek Berger
Proceedings of the Academy of Natural Sciences of Philadelphia
Vol. 127 (1975), pp. 13-24
Stable URL: http://www.jstor.org/stable/4064695
Page Count: 12
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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.
Electrophoretic Phenotypes of Rana ridibunda, Rana lessonae, and Their Hybridogenetic Associate, Rana esculenta
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Abstract

Several enzymes (lactate dehydrogenase, α-glycerophosphate dehydrogenase, glucosephosphate isomerase, creatine kinase, phosphoglucomutase, and aspartate aminotransferase) from central European samples of the two parental species and their hybridogenetic hybrid were examined by starch gel electrophoresis. The data indicate a large degree of genetic difference between the two parental species, supporting prior observations on serum albumin, morphology, and ecology. The data also reconfirm abundantly the hybrid nature of Rana esculenta. Further, the degree of genetic differentiation indicates that little introgression is occurring between the parental species despite the abundance of hybrids between them. That all of the hybrids have genotypes that would be expected in F1 hybrids, even when one parental species is absent, indicates that Rana esculenta has a peculiar reproductive system; the data are consistent with Rana esculenta being hybridogenetic, as has been reported. Using several enzymes in combination allows recognition of four different genetic clones among Rana esculenta that live with and depend on Rana lessonae for reproduction (the L-E system). Only two clones were distinguished in Rana esculenta that live with and are sexually dependent on Rana ridibunda (the R-E system). Numerous triploids were identified in some populations based on red blood cell size; only diploids are discussed here. The large genetic dissimilarity suggests that although both Rana lessonae and Rana ridibunda are members of the Palearctic waterfrog group, their relationships within this group are not close; in fact, each may have its closest relative among the Oriental species of this group.

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