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Articles 1 - 6 of 6
Full-Text Articles in Life Sciences
Recolonizing Carnivores: Is Cougar Predation Behaviorally Mediated By Bears?, Kristin N. Engebretsen, Jon P. Beckmann, Carl W. Lackey, Alyson M. Andreasen, Cody Schroeder, Pat Jackson, Julie K. Young
Recolonizing Carnivores: Is Cougar Predation Behaviorally Mediated By Bears?, Kristin N. Engebretsen, Jon P. Beckmann, Carl W. Lackey, Alyson M. Andreasen, Cody Schroeder, Pat Jackson, Julie K. Young
USDA Wildlife Services: Staff Publications
Conservation and management efforts have resulted in population increases and range expansions for some apex predators, potentially changing trophic cascades and foraging behavior. Changes in sympatric carnivore and dominant scavenger populations provide opportunities to assess how carnivores affect one another. Cougars (Puma concolor) were the apex predator in the Great Basin of Nevada, USA, for over 80 years. Black bears (Ursus americanus) have recently recolonized the area and are known to heavily scavenge on cougar kills. To evaluate the impacts of sympatric, recolonizing bears on cougar foraging behavior in the Great Basin, we investigated kill sites of 31 cougars between …
Spatial Processes Decouple Management From Objectives In A Heterogeneous Landscape: Predator Control As A Case Study, Peter J. Mahoney, Julie K. Young, Kent R. Hersey, Randy T. Larsen, Brock R. Mcmillan, David C. Stoner
Spatial Processes Decouple Management From Objectives In A Heterogeneous Landscape: Predator Control As A Case Study, Peter J. Mahoney, Julie K. Young, Kent R. Hersey, Randy T. Larsen, Brock R. Mcmillan, David C. Stoner
USDA Wildlife Services: Staff Publications
Predator control is often implemented with the intent of disrupting top-down regulation in sensitive prey populations. However, ambiguity surrounding the efficacy of predator management, as well as the strength of top-down effects of predators in general, is often exacerbated by the spatially implicit analytical approaches used in assessing data with explicit spatial structure. Here, we highlight the importance of considering spatial context in the case of a predator control study in south-central Utah. We assessed the spatial match between aerial removal risk in coyotes (Canis latrans) and mule deer (Odocoileus hemionus) resource selection during parturition using …
Cougar Predation Rates And Prey Composition In The Pryor Mountains Of Wyoming And Montana, Linsey W. Blake, Eric M. Gese
Cougar Predation Rates And Prey Composition In The Pryor Mountains Of Wyoming And Montana, Linsey W. Blake, Eric M. Gese
USDA Wildlife Services: Staff Publications
Understanding predator-prey dynamics is a fundamental principle of ecology and an ideal component for management decisions. Across North America, the impact of cougars (Puma concolor) on their prey varies regionally. To document the relationships between cougars, bighorn sheep (Ovis canadensis canadensis), mule deer (Odocoileus hemionus), and feral horses (Equus caballus) on the Bighorn Canyon National Recreation Area and the Pryor Mountains, we deployed GPS collars on 6 cougars (the total number residing on the study area), and visited their clusters to determine predation rates and foraging patterns. We examined the composition of …
Evaluation Of Techniques To Reduce Deer And Elk Damage To Agricultural Crops, Heather E. Johnson, Justin W. Fischer, Matthew Hammond, Patricia D. Dorsey, W. David Walter, Charles Anderson, Kurt C. Vercauteren
Evaluation Of Techniques To Reduce Deer And Elk Damage To Agricultural Crops, Heather E. Johnson, Justin W. Fischer, Matthew Hammond, Patricia D. Dorsey, W. David Walter, Charles Anderson, Kurt C. Vercauteren
USDA Wildlife Services: Staff Publications
Mule deer (Odocoileus hemionus) and Rocky Mountain elk (Cervus elaphus nelsoni) provide important recreational, ecological, and economic benefits, but can also cause substantial damage to agricultural crops. Cervid damage to agriculture creates challenges for wildlife agencies responsible for minimizing crop depredation while maintaining healthy deer and elk populations. Sunflower producers in southwestern Colorado, USA, have experienced high deer and elk damage and were interested in temporary methods to reduce damage that were cost-effective for rotational crops. To address this challenge, we investigated 3 temporary, non-lethal exclusion and repellent techniques for reducing deer and elk damage to …
Mineral Licks: Motivational Factors For Visitation And Accompanying Disease Risk At Communal Use Sites Of Elk And Deer, Michael J. Lavelle, Gregory E. Phillips, Justin W. Fischer, Patrick W. Burke, Nathan W. Seward, Randal S. Stahl, Tracy A. Nichols, Bruce A. Wunder, Kurt C. Vercauteren
Mineral Licks: Motivational Factors For Visitation And Accompanying Disease Risk At Communal Use Sites Of Elk And Deer, Michael J. Lavelle, Gregory E. Phillips, Justin W. Fischer, Patrick W. Burke, Nathan W. Seward, Randal S. Stahl, Tracy A. Nichols, Bruce A. Wunder, Kurt C. Vercauteren
USDA Wildlife Services: Staff Publications
Free-ranging cervids acquire most of their essential minerals through forage consumption, though occasionally seek other sources to account for seasonal mineral deficiencies. Mineral sources occur as natural geological deposits (i.e., licks) or as anthropogenic mineral supplements. In both scenarios, these sources commonly serve as focal sites for visitation. We monitored 11 licks in Rocky Mountain National Park, north-central Colorado, using trail cameras to quantify daily visitation indices (DVI) and soil consumption indices (SCI) for Rocky Mountain elk (Cervus elaphus) and mule deer (Odocoileus hemionus) during summer 2006 and documented elk, mule deer, and moose (Alces …
Immunization With A Synthetic Peptide Vaccine Fails To Protect Mule Deer (Odocoileus Hemionus) From Chronic Wasting Disease, John L. Pilon, Jack C. Rhyan, Lisa L. Wolfe, Tracy R. Davis, Matt P. Mccollum, Katherine I. O'Rourke, Terry R. Spraker, Kurt C. Vercauteren, Michael W. Miller, Thomas Gidlewski, Tracy A. Nichols, Lowell A. Miller, Pauline Nol
Immunization With A Synthetic Peptide Vaccine Fails To Protect Mule Deer (Odocoileus Hemionus) From Chronic Wasting Disease, John L. Pilon, Jack C. Rhyan, Lisa L. Wolfe, Tracy R. Davis, Matt P. Mccollum, Katherine I. O'Rourke, Terry R. Spraker, Kurt C. Vercauteren, Michael W. Miller, Thomas Gidlewski, Tracy A. Nichols, Lowell A. Miller, Pauline Nol
USDA Wildlife Services: Staff Publications
Chronic wasting disease (CWD) adversely affects both wild and captive cervid populations. A vaccine to prevent CWD would be a highly desirable tool to aid in disease management. To this end, we tested in mule deer a combination of CWD vaccines consisting of cervid prion peptide sequences 168-VDQYNNQNTFVHDC-182 and 145- NDYEDRYYRENMYRYPNQ-164 that had previously been shown to delay onset of clinical disease and increase survival in a mouse-adapted scrapie model. Thirteen captive mule deer (Odocoileus hemionus) were divided into vaccine (n=7) and control groups (n=6), and given prime and boost vaccinations intramuscularly 5 wk apart. Eight weeks postprime …