. Distribution, habitat, and calling season of the Illinois chorus frog (Pseudacris streckeri illinoensis) along the lower Illinois River. Frogs. September 1988 Brown and Rose: Illinois Chorus Frog (Pseudacns strecken illmoemis) nated as a low-level sand terrace on Plate 7 ot Willnian 1973), we heard no P. streckert illinoensis. When our study was nearing completion, Moehn (1984) reported the first locality for Pseudacns strecken illinoensis from Scott County: "2.8 km S intersection of US Hwy 54 and Hillview Blacktop." Loren D. Moehn. Fk.i'rk '.'t. New flistrihiitioiial records (larg

. Distribution, habitat, and calling season of the Illinois chorus frog (Pseudacris streckeri illinoensis) along the lower Illinois River. Frogs. September 1988 Brown and Rose: Illinois Chorus Frog (Pseudacns strecken illmoemis) nated as a low-level sand terrace on Plate 7 ot Willnian 1973), we heard no P. streckert illinoensis. When our study was nearing completion, Moehn (1984) reported the first locality for Pseudacns strecken illinoensis from Scott County: "2.8 km S intersection of US Hwy 54 and Hillview Blacktop." Loren D. Moehn. Fk.i'rk '.'t. New flistrihiitioiial records (larg Stock Photo
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. Distribution, habitat, and calling season of the Illinois chorus frog (Pseudacris streckeri illinoensis) along the lower Illinois River. Frogs. September 1988 Brown and Rose: Illinois Chorus Frog (Pseudacns strecken illmoemis) nated as a low-level sand terrace on Plate 7 ot Willnian 1973), we heard no P. streckert illinoensis. When our study was nearing completion, Moehn (1984) reported the first locality for Pseudacns strecken illinoensis from Scott County: "2.8 km S intersection of US Hwy 54 and Hillview Blacktop." Loren D. Moehn. Fk.i'rk '.'t. New flistrihiitioiial records (larger closed circles) for the Illinois (horns hog {lendiLcns <.trefkeri illirwemn) on the (loodplain oi the Illinois River in Oass. Morf^an. and Scott counties, Illinois. Prepared Ircjm a portion ol a L'..S. Geological Survey map (Quincy Nj I.')-;-}; 1956, revised 1980). Photograph by Clerald B. Liebenslein. (personal communication) clarified this location; it oc- curs near one of the choruses we found 2..5 km (bv map) south of the intersection of U.S. Route 36 and the Hillview Blacktop (Figure 3). (The highway per- pendicular to the Hillview Blacktop in Scott County was formerly known as U.S. routes 54 and 36 but is now designated only as U.S. Route 36.) Habitat Availability of sand as a substrate. Brown et al. (1972) demonstrated through discrimination experi- ments that Pseudacris strecken illinueiLsts had a highlv significant choice of sand for burrowing rather than black prairie sod. Sod was chosen in only 3 of 50 trials, and in those three instances the frogs were unable to burrow because of their unusual method of digging; consequently, they remained on the surface. Smith (1966), Brown and Brown (1973), and Axtell and Haskell (1977) also found that P. strecken illinoeiv^is is restricted to areas in the Midwest that have sand sub- strates. In Mason County to the north oi our study area, sand and sandy soils predoiriinafe' Our study area, however, is a mosaic of sand and

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