You are here:
EVALUATING POINT COUNT VERSUS TERRITORY MAPPING CROPLAND BIRDS
Citation:
Cyr, A., D. LePage, AND K. Freemark. EVALUATING POINT COUNT VERSUS TERRITORY MAPPING CROPLAND BIRDS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-93/019.
Description:
Species richness, composition and abundance of farmland birds were compared between point counts (50,100, and 150 m radius half circles) and territory mapping on three 40 ha plots in Quebec, Canada. oint counts of smaller radii tended to have larger density estimates than counts of larger radii. erritory mapping detected 10 more species than 150 m-radius point counts. erritory mapping at 150 m radius detected more birds per species than point counts; relative abundances however were similar. ird density is probably optimally estimated with a 100 m-radius point count. fter four visits, more than 80 of species and birds from seven visits had been detected by 150 m radius point counts. ur modified point count method appears to be accurate enough to reflect the farmland avifauna characterized by more labor intensive methods such as territory mapping.