The Illinois Chorus Frog (Pseudacris illinoensis) is a state-threatened species that has been impacted by development. Pseudacris illinoensis is found in nine counties in Illinois, predominately along the Illinois River, however, there is an isolated population in Madison County. The population once spanned 15 km2, into Granite City and South Roxana, but is now is limited to one isolated population near a mitigation site that was purchased in 1996 for the development of Interstate 255. The last population estimate was in 2002 and was estimated to be 245 individuals and the current status is unknown. This study was conducted to help to preserve a future for this population by evaluating population demography, population range, road mortality, and locating breeding habitat. Mobile Road Surveys were conducted in the Spring of 2015, 2016, and 2018. Four ponds were seined in 2016 to check for successful reproduction. Coordinates were taken for all sightings, choruses, and road mortalities. Maps were created using ArcMap to compare range and areas frogs are most likely to cross the road. Minimum Convex Polygon was used to compare historical range versus present range. Population was unable to be estimated during this study due to lack of recaptures. Females had significantly greater body mass but nonsignificant snout-vent lengths when compared to males. Using Kruskal-Wallis, a segmented survey map showed a significant difference of frogs in the road, with the most near the mitigation site. Minimum Convex polygon showed that there has been a 61% reduction of the range in Madison County. Seining confirmed fish in every pond except one site. It is important that this population be monitored continuously because there is development in the immediate area (less than 0.025 miles from the mitigation site). Future studies should include a population estimate and locations of travel corridors using PIT tags and radio telemetry. Breeding habitat and travel corridors are important land acquisitions to consider.
|Commitee:||Jennings, David, Williams, Jake|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 58/01M(E), Masters Abstracts International|
|Subjects:||Biology, Animal sciences|
|Keywords:||Illinois Chorus Frog, Madison County, Pseudacris illinoensis|
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