Distribution, habitat, and zoogeography of Distribution, habitat, and zoogeography of the plains leopard frog (Rana blairi) in Illinois distributionhabi136brow Year: 1990 Figure 1. Plains leopard frog {Rayia blairi) from Spring Lake, Tazewell County, Illinois, showing broken dorsolateral fold that is displaced medially just anterior to the thigh. Photo- graph by Dr. Douglas W. Whitman. chuckle-like, guttural trill' (Conant 1975). Quandta- tively, the much lower pulse rate (average of less than six pulses per sec below 24'C—Mecham et al. 1973) of the mating call of R. blairi distinguishes it
Distribution, habitat, and zoogeography of Distribution, habitat, and zoogeography of the plains leopard frog (Rana blairi) in Illinois distributionhabi136brow Year: 1990 Figure 1. Plains leopard frog {Rayia blairi) from Spring Lake, Tazewell County, Illinois, showing broken dorsolateral fold that is displaced medially just anterior to the thigh. Photo- graph by Dr. Douglas W. Whitman. chuckle-like, guttural trill' (Conant 1975). Quandta- tively, the much lower pulse rate (average of less than six pulses per sec below 24'C—Mecham et al. 1973) of the mating call of R. blairi distinguishes it from the mating calls of R. pipiens and R sphenocephala. Mating calls of Rana blairi were recorded at a number of locations in central Illinois using a Stancil- Hoffman Minitape M9 tape recorder with Altec 633A and Electro-Voice 644 microphones at a speed of 19 cm ( in) per sec. Cloacal, air, and water tempera- tures were taken with a SchiUtheis quick-reading ther- mometer to the nearest immediately after re- cording calls. A Kay model 6061A Sona-Graph was used to analyze mating calls. Distribution Rana blairi has been found at 194 localides in Illinois. The species is distributed (Fig. 3) mainly in a wide band across the middle of the state with a southern extension along the Mississippi River to extreme southern Illinois (Alexander County). Smith's (1961) zone of intergradation between the two leopard frog taxa he recognized in Illinois (/?. pipiens pipiens and R. pipiens sphenocephala) shows considerable overlap with the distribudon of R blairi across the center of the state. We found many of the specimens from this area that had been examined by Smith (1961) to be R. blairi. Clearly Smith (1961) often considered R blairi zs intergrades between R. pipiens pipiens and R. pipiens sphenocephala. ( came to this conclusion as distribudonal data on leopard frogs in Illinois began to accumulate; Smith and independendy came to the same conclusion [Morris
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