Skip to main content

The IDNR headquarters at 1 Natural Resources Way in Springfield are closed today, Friday, June 12, 2026, as cleanup and recovery continues from severe storms this week. The agency expects to reopen the building to the public on Monday, June 15, 2026.

Project T-40-R1

Project Title: Utility of Anuran Call-survey Data for Estimating Occupancy, Abundance, and Reproductive Success in the Cache River Basin

Community and/or Species Focus:

 Bird-voiced Treefrog, Crayfish Frog, Wood Frog

Goals/Objectives:
  1. Analyze existing frog calling survey data
  2. Estimate occupancy, abundance, reproductive success, and fine-scale habitat variables at the 10 Cache River wetland sites where call-surveys have been conducted for the past 5 years
  3. Conduct an overall multiple regression analysis on the data collected
Achievements:
  1. ​Routes 1-7 were selected for use based on completeness of data, and GIS was used to map the call sight locations
  2. Surveyed sites weekly using visual, call, minnow​ trap, and dip net surveys
  3. No pattern was discovered within genera for the impact of habitat variables on species; all genera with significant effects had only one member affected

Post-Project Survey (if applicable): n/a

Project Period: 4/15/0/ - 3/2/10

Principle Investigator(s):

 Chris Phillips (Illinois Natural History Survey)

Final Report: