File:Distribution, habitat, and calling season of the Illinois chorus frog (Pseudacris streckeri illinoensis) along the lower Illinois River (1988) (20965372542).jpg

Title: Distribution, habitat, and calling season of the Illinois chorus frog (Pseudacris streckeri illinoensis) along the lower Illinois River
Identifier: distributionhabi132brow (find matches)
Year: 1988 (1980s)
Authors: Brown, Lauren E; Rose, George B; Illinois. Natural History Survey Division
Subjects: Frogs
Publisher: Champaign, Ill. : Illinois Natural History Survey
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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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
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Fk.i'rk '.'t. New flistrihiitioiial records (larger closed circles) for the Illinois (horns hog (l\endiLcns <.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 sandy soils along with soils that have a higher content of clay, silt, and/or organic material. Origin of sand areas in the study area. The areas of sand in our study area are Pleistocene alluvial sands deposited by glacial meltwater about 14,()()() years ago (Cote et al. 1970). The sand ridges are a series of rein- nants of eroded sandbars of the Bath Terrace (Cote et al. 1970; Willman and Frye 1970). Fhe Illinois Valley was a major meltwater channel during the Pleis- tocene. When the Wisconsinan glacier was standing behind the Valparaiso Moraine about 14.000 years ago, large quantities of ponded meltwater poured down the Illinois Valley in a great flood. In the vicin- ity of the study area, the valley filled to the level of the Bath Terrace with eroded sand and grarel from up- stream. Subsequently the river deepened its c hannel, cut away part of the fill, and formed the Bath Ter- race. Later overflow (about 10,000 years ago) further eroded the valley to as much as 15.2 m (50 ft) below the present level. During the past 7,000 vears the river has deposited sediment, thereby filling the valley to its present level (C^ote et al. 1970). Calling sites in relation to Pleistocene deposits. Thirty-three of the 3(i cilling sites idcnlifu-d ni this study were on or near (within 800 m. usu.dK muih less) terrace deposits of the Mac kinaw Member (\. Goodfield, personal (ommunication) ol the Henry Formation (Willman 1973). Four of these 33 sites were dearly located on Henry Formation deposits; the remaining 29 weie either on Henr\ Formation de- l)osits or on nearby Cahokia .Alluvium. Onlv 3 tailing sites that were located on Cahokia .Alluvium were more than 800 m from Henrv Formation deposits. The Henry Formation is composed mostly of sand and gravel, and "south cjf Peoria the low-terrace renj-

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