Leonard, K.M., Reese, K.P. & Connelly, J.W. 2000: Distribution, movements and habitats of sage grouse Centrocercus urophasianus on the Upper Snake River Plain of Idaho: changes from the 1950s to the 1990s. - Wildl. Biol. 6: 265-270.
The sage grouse Centrocercus urophasianus population level on the Upper Snake River Plain of Idaho has declined significantly over the past 40 years. We investigated migration patterns and seasonal ranges of these birds to compare to patterns from the 1950s and 1960s. Furthermore, we examined landscape changes that occurred between 1975 and 1992. Migration patterns have not changed since the 1950s. The grouse currently migrate up to 125 km and use an annual population range of at least 2,764 km 2 . The major landscape change since 1975 that occurred in sage grouse habitat was a decline in the total amount of winter range. Between 1975 and 1992, 29,762 ha of sagebrush Artemisia spp. rangeland were converted to cropland, a 74% increase in cropland. Regression analysis suggested a relationship between sagebrush habitat loss and grouse population decline (R² = 0.59, P = 0.002). Approximately 1,244 km² of privately-owned sagebrush on the study area could potentially be converted to cropland, which we predict would have serious negative implications for the sage grouse population.
Key words: annual range, Centrocercus urophasianus, habitat loss, migration, movements, sagebrush, sage grouse, seasonal ranges
Kara M. Leonard* & Kerry P. Reese, Department of Fish and Wildlife Resources, University of Idaho, Moscow, Idaho 83844-1136, USA - e-mail: kreese@uidaho.edu
John W. Connelly, Idaho Department of Fish and Game, 1345 Barton Road, Pocatello, Idaho 83204, USA
*Present address: Grand Canyon National Park, Fire Management Office, P.O. Box 129, Grand Canyon, Arizona 86023, USA