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Speciation within the Chorus Frog Pseudacris triseriata: Morphometric and Mating Call Analyses of the Boreal and Western Subspecies
James E. Platz
Vol. 1989, No. 3 (Aug. 8, 1989), pp. 704-712
Stable URL: http://www.jstor.org/stable/1445498
Page Count: 9
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Data from mating call and morphological analyses of the boreal and western subspecies of the chorus frog Pseudacris triseriata were obtained along a transect from South Dakota to Oklahoma. Two call types are evident. At the northern end of the transect calls are long and low in pulse rate. Both traits had low variability relative to populations further south. The southern end of the transect contained populations with a much shorter call and pulse rates approximately twice those in the north. Identical long and short call types are evident in Colorado as well. Limited data from Oklahoma indicates that the call of P. triseriata feriarum is more like that of P. t. maculata. Multivariate stepwise discriminant analyses performed on data sets containing only morphological measurements produced two clusters of populations which correspond on geographic grounds to two currently recognized subspecies, P. t. maculata and P. t. triseriata. When call data are included, the same two clusters are identified suggesting concordance between call type and morphology. The data indicate that the two entities represent separate species and that the zone of overlap is much more extensive than previously depicted.