CTAP Sampling Design

  • Spatially balanced, random sampling
  • Sampling units are based on 36 square mile townships, there are 1765 within Illinois
  • Each 'habitat type' in a township is given random numbers and sites are sampled sequentially until a suitable site, based on protocol parameters, is found.
  • Initial selection was prior to the 1997 field season.
  • Site sampling is on a 5 year rotation.

Sampled to date

  • Forests: 156
  • Grasslands: 185
  • Wetlands: 180




Taxa Sampled