Impacts of chronic wasting disease on a low density mule deer (Odocoileus hemionus) population in the San Andres Mountains, Chihuahuan Desert, New Mexico

Louis C. Bender, Cristina L. Rodden, Pat Mathis, Mara E. Weisenberger, Octavio C. Rosas Rosas, Patrick C. Morrow, Brock D. Hoenes


Chronic wasting disease (CWD), a contagious neurodegenerative disease of cervids, is becoming increasingly prevalent in the arid Southwest including the Chihuahuan Desert ecoregion.  Population effects of CWD are uncertain, particularly in arid environments, as previous work has been on relatively high density deer populations in semi-arid or temperate environments. In 2002, CWD was detected in a low density mule deer (Odocoileus hemionus) population in the arid San Andres Mountains, a Chihuahuan Desert range in southern New Mexico. We determined prevalence and distribution of CWD, and mortality and movements of deer, to assess the potential impact on low density deer populations in arid environments. Repeated seasonal primarily ante-mortem sampling found stable prevalence of 0.000–0.091, 2003–2008. Annual CWD mortality rate was <0.02, including deer that were culled. Monitoring of adult radio-collared deer showed no dispersal movements away from home ranges, with maximum movements of ≤20 km; similarly, no juveniles dispersed from maternal ranges. Distribution of infected deer was strongly related to presence of other infected deer. Annual survival rates of mule deer and population rate-of-increase suggested little effect of CWD on population-level mortality given observed prevalence. Transmission and reservoirs of CWD in the SAM were likely limited by low deer densities, patchy distribution, and environmental characteristics (i.e., low clay content of soils) unfavorable to prion persistence, characteristics that are typical of most mule deer populations in the Chihuahuan Desert ecoregion.

Palabras clave

Chihuahuan Desert; chronic wasting disease; mule deer; New Mexico; Odocoileus hemionus; San Andres Mountains

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Acta Zoológica Mexicana (nueva serie), 2019, Vol. 35, es una publicación electrónica continua de acceso abierto, editada por el Instituto de Ecología, A.C. (INECOL), Carretera antigua a Coatepec 351, Col. El Haya, Xalapa, Ver. C.P. 91070, Tel. (228) 842-1800, extensión 4112 Editor responsable: Sergio Ibáñez-Bernal, Reservas de Derechos al Uso Exclusivo No. 04-2016-062312173100-203, versión on-line ISSN 2448-8445, [antes también impresa ISSN 0065-1737], con registros otorgados por el Instituto Nacional del Derecho de Autor. Responsable de la última actualización de este volumen, Sergio Ibáñez-Bernal, Carretera antigua a Coatepec, 351, Col. El Haya, Xalapa, Ver., C.P. 91070. Fecha de la última modificación: 18 de enero de 2019.