Movements and Radionuclide Concentrations of Sage Grouse in Southeastern Idaho

Abstract

Movements and radionuclide concentrations of sage grouse (C. urophasianus) summering near nuclear facilities on the Idaho National Engineering Laboratory in southeastern Idaho were studied from 1977-1980. From July 10-Sept. 7, 95% of all locations (131) of radiomarked grouse were within 2 km of their feeding areas on lawns surrounding the facilities. During Oct. and Nov. 82% of all radiolocations (22) were > 2 km from these areas. The maximum 1-way movement to winter range was 81 km. Radionuclide concentrations (primary radiocesium) were higher (P = 0.05) in sage grouse summering near a facility with liquid radioactive waste storage than in grouse summering near a solid radioactive waste disposal area or in control areas. The short biological half-life of the ingested radionuclides and the timing of sage grouse movements from summering areas reduced any potential radiation dose to a person consuming these birds.