Scholarship & Research
Permanent URI for this communityhttps://scholarworks.montana.edu/handle/1/1
Browse
65 results
Search Results
Item The effects of metals on trout populations in the Upper Boulder River, Montana(Montana State University - Bozeman, College of Letters & Science, 1976) Nelson, Frederick A.Item Ecology of white-tailed deer on summer-fall range in northcentral Idaho(Montana State University - Bozeman, College of Letters & Science, 1992) Baumeister, Thomas RobertHome range size, migration patterns, and habitat use were determined for white-tailed deer (Odocoileus virginianus) in a coniferous forest of northcentral Idaho. Sixty-nine deer of both sexes were radio-collared and monitored during daytime hours in summer-fall of 1990 and 1991. Summer-fall home range size for male deer (n = 14) averaged 76 ha (SD = 40). Sumner, fall, and summer-fall average activity radii for male deer averaged 0.33 km (SD = 0.08), 0.34 km (SD = 0.17), and 0.40 km (SD = 0.12), respectively. Distances between 1990 and 1991 summer-fall geographic activity centers averaged 0.31 km (SD = 0.25). On average, summer-fall home ranges in 1991 encompassed 44% (SD= 32) of 1990 home ranges. Fall migration distances averaged 38 km (SD = 8) in 1990 and 39 km (SD= 9) in 1991. Deer migrated, on average, in 4 days (SD = 2) and 7 days (SD = 4) to the winter range in 1990 and 1991, respectively. Two subpopulations of deer that differed in respect to date of departure from the summer-fall range and average migration distance were identified. Departure dates and migration distance were related to migration routes. Topography (slope, aspect, elevation, landform types) influenced habitat use to a lesser degree than vegetation structure and composition. Home ranges were composed of a mosaic of unlogged and logged areas. Deer preferred pole timber and avoided sapling stands, clearcuts, and the moistest habitat types. Relative to fall habitat, summer habitat was characterized by more open-canopied coniferous cover types associated with high forb and shrub cover. Male deer showed no differences in habitat use patterns between prehunt and hunt periods.Item Population ecology of mule deer with emphasis on potential impacts of gas and oil development along the east front of the Rocky Mountains, northcentral Montana(Montana State University - Bozeman, College of Letters & Science, 1982) Pac, Helga IhsleItem Range use and interspecific competition of Rocky Mountain bighorn sheep in the Highland Mountains, Montana(Montana State University - Bozeman, College of Letters & Science, 1994) Weigand, Joseph PaulItem Responses of elk to a 500 kV transmission line on the North Boulder winter range, Montana(Montana State University - Bozeman, College of Letters & Science, 1986) Nelson, Gerald PatrickItem A study of waterfowl broods in eastern Montana with special reference to movements and the relationship of reservoir fencing to production(Montana State University - Bozeman, College of Letters & Science, 1955) Berg, Paul F.Item Potential impacts of altering discharge pattern from Hauser Dam, Missouri River, on young-of-the-year brown trout and rainbow trout(Montana State University - Bozeman, College of Letters & Science, 1985) Carty, Daniel GregoryDaily flow fluctuations would occur in the Missouri River between Hauser Dam and Holter Reservoir if Hauser Dam were converted to a hydroelectric peaking facility. To address potential impacts of fluctuating flows on free-swimming young-of-the-year (YOY) brown trout (Salmo trutta) and rainbow trout (S. gairdneri) emergence, growth, abundance, distribtion, movement, and habitat use were investigated. During reduced-flow tests stranding, isolation, displacement, and habitat changes were evaluated. Hydraulic modeling was used to predict changes in the quantity of usable habitat at different discharges. Recruitment from a tributary into the river was also monitored. Field data were collected between April 1982 and November 1983. Young-of-the-year brown trout were first observed in early April while YOY rainbow trout were first found in mid-June. Both species used relatively shallow, low-velocity water near shore where cover was abundant. Reduced-flow tests in August of each year revealed little stranding or isolation, and YOY trout were not permanently displaced from temporarily dewatered habitat. Hydraulic modeling predicted an increase in the quantity of habitat as discharge decreased, but field observations indicated a reduction in habitat quality. The tributary was found to be a relatively important source of recruitment to the river rainbow trout fishery but rather unimportant to the river brown trout fishery.Item Effects of ecological changes induced by various sagebrush control techniques on small mammal populations(Montana State University - Bozeman, College of Letters & Science, 1970) Tschache, Ottley PaulItem Ecology of the bald eagle and osprey in Yellowstone National Park,(Montana State University - Bozeman, College of Letters & Science, 1975) Swenson, Jon E.Item Ecological effects of winter road grooming on bison in Yellowstone National Park(Montana State University - Bozeman, College of Letters & Science, 2000) Bjornlie, Daniel David