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Sympatric Interaction between Two Forms of Leopard Frog (Rana pipiens Complex) in Texas
James Ernest Platz
Vol. 1972, No. 2 (Jun. 8, 1972), pp. 232-240
Stable URL: http://www.jstor.org/stable/1442482
Page Count: 9
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Electrophoretic analyses of blood serum, together with morphological analyses, have been used to determine the extent of interspecific gene flow between two forms of leopard frog in an area of sympatry in western Texas. Three adults and nine juveniles out of 138 individuals from the contact zone have been identified as hybrids on the basis of electrophoretic data. Of these at least four may represent backcross products. Morphological analysis of the head width-head length ratio in terms of snouturostyle length did not demonstrate introgression. Dorsal spot analysis revealed no significant variance in spot number for the sympatric animals. This study indicates that hybridization in the area of contact is rare, but that backcross individuals do exist.