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Age Structure And Reproductive Activity Of The Blue Sucker In The Milk River, Missouri River Drainage, Montana, Julie Bednarski, Dennis L. Scarnecchia
Age Structure And Reproductive Activity Of The Blue Sucker In The Milk River, Missouri River Drainage, Montana, Julie Bednarski, Dennis L. Scarnecchia
The Prairie Naturalist
The life history and ecology of the blue sucker (Cycleptus elongatus) in the lower Milk River, Montana were investigated in 2002 and 2003. A total of 253 blue sucker was captured; 248 adult fish, three larval fish, and two age-0 juveniles. The ages (n = 102) of the adult blue sucker ranged from 10 to 37 years; maximum age greatly exceeded ages reported in other studies. Blue sucker in the Milk River population grew slower, matured later, and lived longer than fish at lower latitudes. Adult females of the blue sucker were longer and weighed more than …
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
United States Department of Agriculture 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 …