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Articles 1 - 3 of 3
Full-Text Articles in Physical Sciences and Mathematics
Increased Abundance Of The Common Raven Within The Ranges Of Greater And Gunnison Sage-Grouse: Influence Of Anthropogenic Subsidies And Fire, Jonathan B. Dinkins, Lindsey R. Perry, Jeffrey L. Beck, Jimmy D. Taylor
Increased Abundance Of The Common Raven Within The Ranges Of Greater And Gunnison Sage-Grouse: Influence Of Anthropogenic Subsidies And Fire, Jonathan B. Dinkins, Lindsey R. Perry, Jeffrey L. Beck, Jimmy D. Taylor
USDA Wildlife Services: Staff Publications
The common raven (Corvus corax; raven) is native to North America and has increased in abundance, especially throughout western North America, during the last century. Human subsidies have facilitated raven dispersal into less suitable habitats and enabled these populations to maintain higher annual survival and reproduction. Concomitantly, overabundant raven populations are impacting other native at-risk species such as the greater sage-grouse (Centrocercus urophasianus) and potentially the Gunnison sage-grouse (C. minimus). Using Breeding Bird Survey data from 1995–2014, we evaluated raven count data to quantitatively describe changes in abundance and expansion into sagebrush ( …
Susceptibility Of Greater Sage-Grouse To Experimental Infection With West Nile Virus, Larry Clark, Jeffrey Hall, Robert Mclean, Michael Dunbar, Kaci Klenk, Richard Bowen, Cynthia A. Smeraski
Susceptibility Of Greater Sage-Grouse To Experimental Infection With West Nile Virus, Larry Clark, Jeffrey Hall, Robert Mclean, Michael Dunbar, Kaci Klenk, Richard Bowen, Cynthia A. Smeraski
USDA Wildlife Services: Staff Publications
Populations of greater sage-grouse (Centrocercus urophasianus) have declined 45– 80% in North America since 1950. Although much of this decline has been attributed to habitat loss, recent field studies have indicated that West Nile virus (WNV) has had a significant negative impact on local populations of grouse. We confirm the susceptibility of greater sage-grouse to WNV infection in laboratory experimental studies. Grouse were challenged by subcutaneous injection of WNV (103.2 plaque-forming units [PFUs]). All grouse died within 6 days of infection. The Kaplan-Meier estimate for 50% survival was 4.5 days. Mean peak viremia for nonvaccinated birds was 106.4 PFUs/ml (6100.2 …
Total Plasma Protein And Renesting By Greater Sage-Grouse, Michael A. Gregg, Mike R. Dunbar, John A. Crawford, Michael D. Pope
Total Plasma Protein And Renesting By Greater Sage-Grouse, Michael A. Gregg, Mike R. Dunbar, John A. Crawford, Michael D. Pope
USDA Wildlife Services: Staff Publications
Greater sage-grouse (Centrocercus urophasianus) population declines have been attributed to reduced productivity. Although renesting by sage-grouse may contribute significantly to annual productivity during some years, little information is available on this aspect of sage-grouse reproductive ecology. We investigated the relationship between total plasma protein, age of hen, time of first nest initiation, and time of first nest loss on occurrence of renesting. We captured, assigned age, extracted blood, and radiomarked prelaying, female sage-grouse on 4 study areas during 1999–2004. We monitored radiomarked females from mid-April through June to identify period of nest initiation (early, mid, or late), nest …