Presentation intended to provide basic public information about the U.S. Fish and Wildlife Service's 12-month finding for the greater sage-grouse, conducted pursuant to the 2004 Endangered Species Act.
Trends in greater sage-grouse breeding populations are typically indexed by determining the peak number of males attending a lek in a lekking season. Numerous studies have estimated negative trends in sage-grouse breeding populations over time via data collected for the last 50 years. However, the inherent bias in data collection...
In Oregon, sage grouse (Centrocercus urophasianus) were common in the
eastern portion of the state. Since 1940 populations declined because of
decreased productivity. The western subspecies (C. u. phaios) was listed as a
candidate for threatened and endangered status in 1985 because of declines in
Oregon and Washington and extirpation...
Sage grouse (Centrocercus urophasianus) populations in Oregon
declined during the past 30 years as a result of impaired productivity.
The western subspecies (C. u. phaios) was listed as a candidate for
threatened and endangered status by the Department of the Interior in
1985 because of declines in Oregon and Washington...
Greater sage-grouse (Centrocercus urophasianus) populations declined range wide during the past 50 years. Grouse populations were 2-3 times larger than the current population as recently as the early 1970's. In addition to habitat loss and fragmentation, declines were attributed habitat degradation that caused reduced productivity. Because chick survival remains the...