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Hybridization in the Diploid-Tetraploid Treefrogs Hyla chrysoscelis and Hyla versicolor
H. Carl Gerhardt, Margaret B. Ptacek, Louise Barnett and Kenneth G. Torke
Vol. 1994, No. 1 (Feb. 1, 1994), pp. 51-59
Stable URL: http://www.jstor.org/stable/1446670
Page Count: 9
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The first cytologically confirmed natural hybrids between the diploid-tetraploid gray treefrogs, Hyla chrysoscelis and H. versicolor, were two triploid males initially detected by their distinctive advertisement calls. Analyses of the pulse-repetition rate and shape of the advertisement calls of these triploid hybrids suggest that one of the two previously reported putative hybrids was a hybrid and the other male was a H. chrysoscelis. The calls of the field-recorded hybrids were intermediate in pulse rate in comparison to the parental species and significantly different in structure than were the calls of laboratory-reared hybrids described by Mable and Bogart (1991). Mated pairs were collected in six syntopic populations in south-central Missouri. Flow cytometric identifications revealed that five (about 6.7%) of the 75 pairs in two of these ponds were mismated; these five mismatings represented about 3% of all 181 pairs examined from all Missouri populations. The rarity of sexually mature hybrids, despite a fairly high frequency of mismatings in at least two localities, indicates severe selection against hybrids. In four of the five mismated pairs, the female was H. versicolor. Analyses of mtDNA sequences showed that the female parent of the two cytologically confirmed natural hybrids was also H. versicolor.