Bryan Richards
Bryan Richards is the Emerging Disease Coordinator at the USGS National Wildlife Health Center.
Science and Products
Filter Total Items: 23
USGS quarterly wildlife mortality report July 2018
No abstract available.
Authors
Bryan J. Richards, Barbara Bodenstein, Anne Ballmann, Michelle St. Martin
Quarterly wildlife mortality report April 2018
No abstract available.
Authors
Bryan J. Richards, Barbara Bodenstein, Anne Ballmann, C. LeAnn White
Chronic wasting disease—Status, science, and management support by the U.S. Geological Survey
The U.S. Geological Survey (USGS) investigates chronic wasting disease (CWD) at multiple science centers and cooperative research units across the Nation and supports the management of CWD through science-based strategies. CWD research conducted by USGS scientists has three strategies: (1) to understand the biology, ecology, and causes and distribution of CWD; (2) to assess and predict the spread
Authors
Christina M. Carlson, M. Camille Hopkins, Natalie T. Nguyen, Bryan J. Richards, Daniel P. Walsh, W. David Walter
Quarterly wildlife mortality report January 2018
No abstract available.
Authors
Bryan J. Richards, Daniel A. Grear, Anne Ballmann, Robert J. Dusek, Robert Kaler, Kathy Kuletz
Quarterly wildlife mortality report October 2017
No abstract available
Authors
Bryan J. Richards, Barbara Bodenstein, Anne Ballmann, C. LeAnn White, Leslie Frattaroli
Endemic chronic wasting disease causes mule deer population decline in Wyoming
Chronic wasting disease (CWD) is a fatal transmissible spongiform encephalopathy affecting white-tailed deer (Odocoileus virginianus), mule deer (Odocoileus hemionus), Rocky Mountain elk (Cervus elaphus nelsoni), and moose (Alces alces shirasi) in North America. In southeastern Wyoming average annual CWD prevalence in mule deer exceeds 20% and appears to contribute to regional population declines.
Authors
Melia DeVivo, David R. Edmunds, Matthew J. Kauffman, Brant A. Schumaker, Justin Binfet, Terry J. Kreeger, Bryan J. Richards, Hermann M. Schatzl, Todd Cornish
Quarterly wildlife mortality report January 2017
No abstract available.
Authors
Bryan J. Richards, Daniel A. Grear, Anne Ballmann, Robert J. Dusek, Barbara Bodenstein
Estimating ages of white-tailed deer: Age and sex patterns of error using tooth wear-and-replacement and consistency of cementum annuli
The age structure of harvested animals provides the basis for many demographic analyses. Ages of harvested white-tailed deer (Odocoileus virginianus) and other ungulates often are estimated by evaluating replacement and wear patterns of teeth, which is subjective and error-prone. Few previous studies however, examined age- and sex-specific error rates. Counting cementum annuli of incisors is an al
Authors
Michael D. Samuel, Daniel J. Storm, Robert E. Rolley, Thomas Beissel, Bryan J. Richards, Timothy R. Van Deelen
Deer density and disease prevalence influence transmission of Chronic Wasting Disease in White-tailed Deer
Host-parasite dynamics and strategies for managing infectious diseases of wildlife depend on the functional relationship between disease transmission rates and host density. However, the disease transmission function is rarely known for free-living wildlife, leading to uncertainty regarding the impacts of diseases on host populations and effective control actions. We evaluated the influence of dee
Authors
Michael D. Samuel, Bryan J. Richards, Daniel J. Storm, Robert E. Rolley, Paul Shelton, Nicholas S. Keuler, Timothy R. Van Deelen
Comparison of visual-based helicopter and fixed-wing forward-looking infrared surveys for counting white-tailed deer Odocoileus virginianus
Aerial surveys using direct counts of animals are commonly used to estimate deer abundance. Forward-looking infrared (FLIR) technology is increasingly replacing traditional methods such as visual observation from helicopters. Our goals were to compare fixed-wing FLIR and visual, helicopter-based counts in terms of relative bias, influence of snow cover and cost. We surveyed five plots: four 41.4 k
Authors
Daniel J. Storm, Michael D. Samuel, Timothy R. Van Deelen, Karl D. Malcolm, Robert E. Rolley, Nancy A. Frost, Donald P. Bates, Bryan J. Richards
Modeling routes of chronic wasting disease transmission: Environmental prion persistence promotes deer population decline and extinction
Chronic wasting disease (CWD) is a fatal disease of deer, elk, and moose transmitted through direct, animal-to-animal contact, and indirectly, via environmental contamination. Considerable attention has been paid to modeling direct transmission, but despite the fact that CWD prions can remain infectious in the environment for years, relatively little information exists about the potential effects
Authors
Emily S. Almberg, Paul C. Cross, Christopher J. Johnson, Dennis M. Heisey, Bryan J. Richards
Science and Products
Filter Total Items: 23
USGS quarterly wildlife mortality report July 2018
No abstract available.
Authors
Bryan J. Richards, Barbara Bodenstein, Anne Ballmann, Michelle St. Martin
Quarterly wildlife mortality report April 2018
No abstract available.
Authors
Bryan J. Richards, Barbara Bodenstein, Anne Ballmann, C. LeAnn White
Chronic wasting disease—Status, science, and management support by the U.S. Geological Survey
The U.S. Geological Survey (USGS) investigates chronic wasting disease (CWD) at multiple science centers and cooperative research units across the Nation and supports the management of CWD through science-based strategies. CWD research conducted by USGS scientists has three strategies: (1) to understand the biology, ecology, and causes and distribution of CWD; (2) to assess and predict the spread
Authors
Christina M. Carlson, M. Camille Hopkins, Natalie T. Nguyen, Bryan J. Richards, Daniel P. Walsh, W. David Walter
Quarterly wildlife mortality report January 2018
No abstract available.
Authors
Bryan J. Richards, Daniel A. Grear, Anne Ballmann, Robert J. Dusek, Robert Kaler, Kathy Kuletz
Quarterly wildlife mortality report October 2017
No abstract available
Authors
Bryan J. Richards, Barbara Bodenstein, Anne Ballmann, C. LeAnn White, Leslie Frattaroli
Endemic chronic wasting disease causes mule deer population decline in Wyoming
Chronic wasting disease (CWD) is a fatal transmissible spongiform encephalopathy affecting white-tailed deer (Odocoileus virginianus), mule deer (Odocoileus hemionus), Rocky Mountain elk (Cervus elaphus nelsoni), and moose (Alces alces shirasi) in North America. In southeastern Wyoming average annual CWD prevalence in mule deer exceeds 20% and appears to contribute to regional population declines.
Authors
Melia DeVivo, David R. Edmunds, Matthew J. Kauffman, Brant A. Schumaker, Justin Binfet, Terry J. Kreeger, Bryan J. Richards, Hermann M. Schatzl, Todd Cornish
Quarterly wildlife mortality report January 2017
No abstract available.
Authors
Bryan J. Richards, Daniel A. Grear, Anne Ballmann, Robert J. Dusek, Barbara Bodenstein
Estimating ages of white-tailed deer: Age and sex patterns of error using tooth wear-and-replacement and consistency of cementum annuli
The age structure of harvested animals provides the basis for many demographic analyses. Ages of harvested white-tailed deer (Odocoileus virginianus) and other ungulates often are estimated by evaluating replacement and wear patterns of teeth, which is subjective and error-prone. Few previous studies however, examined age- and sex-specific error rates. Counting cementum annuli of incisors is an al
Authors
Michael D. Samuel, Daniel J. Storm, Robert E. Rolley, Thomas Beissel, Bryan J. Richards, Timothy R. Van Deelen
Deer density and disease prevalence influence transmission of Chronic Wasting Disease in White-tailed Deer
Host-parasite dynamics and strategies for managing infectious diseases of wildlife depend on the functional relationship between disease transmission rates and host density. However, the disease transmission function is rarely known for free-living wildlife, leading to uncertainty regarding the impacts of diseases on host populations and effective control actions. We evaluated the influence of dee
Authors
Michael D. Samuel, Bryan J. Richards, Daniel J. Storm, Robert E. Rolley, Paul Shelton, Nicholas S. Keuler, Timothy R. Van Deelen
Comparison of visual-based helicopter and fixed-wing forward-looking infrared surveys for counting white-tailed deer Odocoileus virginianus
Aerial surveys using direct counts of animals are commonly used to estimate deer abundance. Forward-looking infrared (FLIR) technology is increasingly replacing traditional methods such as visual observation from helicopters. Our goals were to compare fixed-wing FLIR and visual, helicopter-based counts in terms of relative bias, influence of snow cover and cost. We surveyed five plots: four 41.4 k
Authors
Daniel J. Storm, Michael D. Samuel, Timothy R. Van Deelen, Karl D. Malcolm, Robert E. Rolley, Nancy A. Frost, Donald P. Bates, Bryan J. Richards
Modeling routes of chronic wasting disease transmission: Environmental prion persistence promotes deer population decline and extinction
Chronic wasting disease (CWD) is a fatal disease of deer, elk, and moose transmitted through direct, animal-to-animal contact, and indirectly, via environmental contamination. Considerable attention has been paid to modeling direct transmission, but despite the fact that CWD prions can remain infectious in the environment for years, relatively little information exists about the potential effects
Authors
Emily S. Almberg, Paul C. Cross, Christopher J. Johnson, Dennis M. Heisey, Bryan J. Richards