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Natural Hybridization between Diploid and Tetraploid Species of Leaf-Frogs, Genus Phyllomedusa (Amphibia)
Célio F. B. Haddad, José P. Pombal, Jr. and Radenka F. Batistic
Journal of Herpetology
Vol. 28, No. 4 (Dec., 1994), pp. 425-430
Published by: Society for the Study of Amphibians and Reptiles
Stable URL: http://www.jstor.org/stable/1564953
Page Count: 6
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Sympatric populations of the leaf-frogs Phyllomedusa distincta (2n = 26) and P. tetraploidea (4n = 52) were studied in southeastern Brazil. In a region of sympatry, seven of 15 leaf-frogs were triploid hybrids (3n = 39). The advertisement calls of both species are similar, and may not function adequately as a premating isolation mechanism. Triploids apparently exhibit low fertility or sterility, supporting the assertion that diploid and tetraploid populations are valid species. We suggest that P. tetraploidea originated by autopolyploidy of P. distincta, based on the following evidence: (1) the indistinguishable vocalizations of diploid and tetraploid species, and (2) the geographic distribution of species in the Phyllomedusa burmeisteri group.
Journal of Herpetology © 1994 Society for the Study of Amphibians and Reptiles