Publications
Below is a list of available NOROCK peer reviewed and published science. If you are in search of a specific publication and cannot find it below or through a search, please contact twojtowicz@usgs.gov.
Filter Total Items: 1220
Habitat manipulation influences northern bobwhite resource selection on a reclaimed surface mine
More than 600,000 ha of mine land have been reclaimed in the eastern United States, providing large contiguous tracts of early successional vegetation that can be managed for northern bobwhite (Colinus virginianus). However, habitat quality on reclaimed mine land can be limited by extensive coverage of non-native invasive species, which are commonly planted during reclamation. We used discrete-cho
Authors
Jarred M. Brooke, David C. Peters, Ashley M. Unger, Evan P. Tanner, Craig A. Harper, Patrick D. Keyser, Joseph D. Clark, John J. Morgan
Trends in Rocky Mountain amphibians and the role of beaver as a keystone species
Despite prevalent awareness of global amphibian declines, there is still little information on trends for many widespread species. To inform land managers of trends on protected landscapes and identify potential conservation strategies, we collected occurrence data for five wetland-breeding amphibian species in four national parks in the U.S. Rocky Mountains during 2002–2011. We used explicit dyna
Authors
Blake R. Hossack, William R. Gould, Debra A. Patla, Erin L. Muths, Rob Daley, Kristin Legg, P. Stephen Corn
Terrain parameters of glide snow avalanches and a simple spatial glide snow avalanche model
Glide snow avalanches are dangerous and difficult to predict. Despite substantial recent research there is still inadequate understanding regarding the controls of glide snow avalanche release. Glide snow avalanches often occur in similar terrain or the same locations annually, and repeat observations and prior work suggest that specific topography may be critical. Thus, to gain a better understan
Authors
Erich H. Peitzsch, Jordy Hendrikx, Daniel B. Fagre
Changing migratory patterns in the Jackson elk herd
Migratory behavior in ungulates has declined globally and understanding the causative factors (environmental change vs. human mediated) is needed to formulate effective management strategies. In the Jackson elk herd of northwest Wyoming, demographic differences between summer elk (Cervus elaphus) population segments have led to changes in migratory patterns over a 35-year time period. The proporti
Authors
Eric Cole, Aaron M. Foley, Jeffrey M. Warren, Bruce L. Smith, Sarah Dewey, Douglas G. Brimeyer, W. Sue Fairbanks, Hall Sawyer, Paul C. Cross
Estimating the phenology of elk brucellosis transmission with hierarchical models of cause-specific and baseline hazards
Understanding the seasonal timing of disease transmission can lead to more effective control strategies, but the seasonality of transmission is often unknown for pathogens transmitted directly. We inserted vaginal implant transmitters (VITs) in 575 elk (Cervus elaphus canadensis) from 2006 to 2014 to assess when reproductive failures (i.e., abortions or still births) occur, which is the primary tr
Authors
Paul C. Cross, Eric Maichak, Jared D. Rogerson, Kathryn M. Irvine, Jennifer D. Jones, Dennis M. Heisey, William H. Edwards, Brandon M. Scurlock
Fine-scale movements of rural free-ranging dogs in conservation areas in the temperate rainforest of the coastal range of southern Chile
Domestic dogs can play a variety of important roles for farmers. However, when in proximity to conservation areas, the presence of rural free-ranging dogs can be problematic due to the potential for predation of, competition with, or transmission of infectious disease to local threatened fauna. We used a frequent location radio tracking technology to study rural free-ranging dog movements and habi
Authors
Maximiliano Sepulveda, Katherine Pelican, Paul C. Cross, Antonieta Eguren, Randall S. Singer
Influences of supplemental feeding on winter elk calf:cow ratios in the southern Greater Yellowstone Ecosystem
Several elk herds in the Greater Yellowstone Ecosystem are fed during winter to alleviate interactions with livestock, reduce damage to stored crops, and to manage for high elk numbers. The effects of supplemental feeding on ungulate population dynamics has rarely been examined, despite the fact that supplemental feeding is partially justified as necessary for maintaining or enhancing population g
Authors
Aaron M. Foley, Paul C. Cross, David A Christianson, Brandon M. Scurlock, Scott Creely
Spatial sorting promotes the spread of maladaptive hybridization
Invasive hybridization is causing loss of biodiversity worldwide. The spread of such introgression can occur even when hybrids have reduced Darwinian fitness, which decreases the frequency of hybrids due to low survival or reproduction through time. This paradox can be partially explained by spatial sorting, where genotypes associated with dispersal increase in frequency at the edge of expansion,
Authors
Winsor H. Lowe, Clint C. Muhlfeld, Fred W. Allendorf
Impact of experimental habitat manipulation on northern bobwhite survival
Habitat management for northern bobwhite (Colinus virginianus) should affect vital rates, but direct linkages with survival are not well documented; therefore, we implemented an experiment to evaluate those responses. We conducted our experiment on a reclaimed surface mine, a novel landscape where conditions were considered sub-optimal because of the dominance of non-native vegetation, such as ser
Authors
David C. Peters, Jarred M. Brooke, Evan P. Tanner, Ashley M. Unger, Patrick D. Keyser, Craig A. Harper, Joseph D. Clark, John J. Morgan
Space use and habitat selection by resident and transient coyotes (Canis latrans)
Little information exists on coyote (Canis latrans) space use and habitat selection in the southeastern United States and most studies conducted in the Southeast have been carried out within small study areas (e.g., ≤1,000 km2). Therefore, studying the placement, size, and habitat composition of coyote home ranges over broad geographic areas could provide relevant insights regarding how coyote pop
Authors
Joseph W Hinton, Frank T. van Manen, Michael J Chamberlain
Social living mitigates the costs of a chronic illness in a cooperative carnivore
Infection risk is assumed to increase with social group size, and thus be a cost of group living. We assess infection risk and costs with respect to group size using data from an epidemic of sarcoptic mange (Sarcoptes scabiei) among grey wolves (Canis lupus). We demonstrate that group size does not predict infection risk and that individual costs of infection, in terms of reduced survival, can be
Authors
Emily S. Almberg, Paul C. Cross, Andrew P. Dobson, Douglas W. Smith, Matthew C Metz, Daniel R. Stahler, Peter J. Hudson
Genetic diversity is related to climatic variation and vulnerability in threatened bull trout
Understanding how climatic variation influences ecological and evolutionary processes is crucial for informed conservation decision-making. Nevertheless, few studies have measured how climatic variation influences genetic diversity within populations or how genetic diversity is distributed across space relative to future climatic stress. Here, we tested whether patterns of genetic diversity (allel
Authors
Ryan Kovach, Clint C. Muhlfeld, Alisa A. Wade, Brian K. Hand, Diane C. Whited, Patrick W. DeHaan, Robert K. Al-Chokhachy, Gordon Luikart