![]() These findings support CWD as a significant contributor to mule deer population decline. A model derived from the demography of only CWD-negative individuals yielded λ = 1.00, indicating a stable population if CWD were absent. We estimated λ = 0.79, indicating an annual population decline of 21% under current CWD prevalence levels. Pregnancy and fawn recruitment were not observed to be influenced by CWD. Mean annual survival rates of CWD-negative and CWD-positive deer were 0.76 and 0.32, respectively. Captured adult (≥ 1.5 years old) deer were tested ante-mortem for CWD using tonsil biopsies and monitored using radio telemetry. Mule deer were captured from 2010–2014 in southern Converse County Wyoming, USA. ![]() We determined the effect of CWD on mule deer demography using age-specific, female-only, CWD transition matrix models to estimate the population growth rate ( λ). In southeastern Wyoming average annual CWD prevalence in mule deer exceeds 20% and appears to contribute to regional population declines. Cornish, Conceptualization, Data curation, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Visualization, Writing – review & editing 1Ĭhronic 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. Schätzl, Data curation, Methodology, Resources, Validation, Visualization, Writing – review & editing, 7 and Todd E. ![]() Richards, Conceptualization, Funding acquisition, Investigation, Project administration, Resources, Validation, Visualization, Writing – review & editing, 6 Hermann M. Kreeger, Conceptualization, Data curation, Funding acquisition, Investigation, Methodology, Project administration, Resources, Validation, Visualization, Writing – review & editing, 5, ¶ Bryan J. Schumaker, Conceptualization, Data curation, Formal analysis, Methodology, Resources, Validation, Visualization, Writing – review & editing, 1 Justin Binfet, Conceptualization, Data curation, Funding acquisition, Investigation, Methodology, Project administration, Resources, Validation, Visualization, Writing – review & editing, 4 Terry J. Kauffman, Conceptualization, Data curation, Formal analysis, Methodology, Resources, Validation, Visualization, Writing – review & editing, 3 Brant A. Edmunds, Conceptualization, Data curation, Investigation, Methodology, Project administration, Resources, Validation, Visualization, Writing – review & editing, 2 Matthew J. DeVivo, Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Validation, Visualization, Writing – original draft, Writing – review & editing, 1, ¤ * David R.
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