Research

Most of my career has been devoted to field research, with my graduate work focusing on social behavior of bighorn sheep in several populations in Montana, Nevada and New Mexico.  Following that, I started studying carnivore ecology in southeastern Arizona, primarily on coatis and skunks, and some of their predators.  Below is a list of the technical publications resulting from my research projects.  Many of these can be downloaded from my profile on Researchgate.

My current research focuses on using audio recordings to document species presence, soundscape diversity, and acoustic phenology.

Bighorn sheep

  1. Hass, C. 1984. “Cooperative” nursing by bighorn ewes on the National Bison Range. Proceedings Northern Wild Sheep & Goat Council 4:252-269.
  2. Hass, C. 1989. Bighorn lamb mortality: predation, inbreeding, and population effects. Canadian Journal of Zoology 67: 699-705.
  3. Hass, C. 1990. Alternative maternal-care patterns in two herds of bighorn sheep. Journal of Mammalogy 71: 24-35.
  4. Hass, C. 1991. Social status in female bighorn sheep (Ovis canadensis): expression, development, and reproductive correlates. Journal of Zoology (London) 225: 509-523.
  5. Hass, C. and D.A. Jenni. 1991. Structure and ontogeny of dominance relationships among bighorn rams. Canadian Journal of Zoology 69: 471-476.
  6. Hogg, T., C.C. Hass, and D.A. Jenni. 1992. Sex-biased maternal expenditure in Rocky Mountain bighorn sheep. Behavioral Ecology & Sociobiology 31: 243-251.
  7. Hass, C. and D.A. Jenni. 1993. Social play among juvenile bighorn sheep: structure, development, and relationship to adult behavior. Ethology 93: 105-116.
  8. Hass, C. 1995. Gestation periods and birth weights of desert bighorn sheep in relation to other Caprinae. Southwestern Naturalist 40: 139-147.
  9. Hass, C. 1997. Seasonality of births in bighorn sheep. Journal of Mammalogy 78: 1251-1260.

Coatis

  1. Hass, C. and J.R. Roback. 2000. Copulatory behavior of white-nosed coatis (Nasua narica). Southwestern Naturalist 45: 329-331.
  2. Hass, C. 2002. Home-range dynamics of white-nosed coatis in southeastern Arizona. Journal of Mammalogy 83: 934-946.
  3. Hass, C. and D. Valenzuela. 2002. Anti-predator benefits of group living in white-nosed coatis (Nasua narica). Behavioral Ecology & Sociobiology 51: 570-578.
  4. Nigenda-Morales, S. A. Lay, B. Hirsch, C. Hass, D. Valenzuela-Galvan, G. Booth-Binczik, J. Kaprowski, K. Kapheim, K. McFadden, K. Peter-Koepfli, M. Gompper, M. McColgin, R.K. Wayne, and S. Booth-Binczik. 2018. Phyleogeographic and diversification patterns of the white-nosed coati (Nasua narica): evidence for south-to-north colonization of North America.  Molecular Phylogenetics and Evolution 19:149-163.
  5. Hass, C. 2021. Nosey beasts: natural history of the coatis.  Wild Mountain Echoes Press (Book).
  6. Frey, J.K. and C. Hass. In Press. White-nosed coati (Nasua narica). In: Wild Carnivores of New Mexico, University of New Mexico Press.

Skunks

  1. Dragoo, W., D. Matthes, A. Aragon, C.C. Hass, and T.L. Yates. 2004. Identification of skunk species submitted for rabies testing in the desert southwest. Journal of Wildlife Diseases 40: 371-376.
  2. Hass, C. and J.W. Dragoo. 2006. Rabies in hooded (Mephitis macroura) and striped skunks (M. mephitis) in Arizona. Journal of Wildlife Diseases 42: 825-829.
  3. Hass, C. and J.W. Dragoo. 2017. Competition and coexistence in sympatric skunks. Pp. 464-477 In D. W. Macdonald, C. Newman, and L. Harrington, editors. Biology and conservation of the musteloids. Oxford University Press, Oxford.
  4. C. Hass and J.W. Dragoo. 2024. Hooded skunk (Mephitis macroura). In J.-L. E. Catron and J.K. Frey, editors.  The Wild Carnivores of New Mexico. University of New Mexico Press, Albuquerque.
  5. C. Hass and J.W. Dragoo. 2024.  Striped skunk (Mephitis mephitis).  In J.-L. E. Catron and J. K. Frey, editors. The Wild Carnivores of New Mexico. University of New Mexico Press, Albuquerque.
  6. Dragoo, J.W. and C. Hass. 2024. Western Spotted skunk (Spilogale gracilis) and Rio Grande Spotted Skunk (S. leucoparia). In J.-L. E. Catron and J. K. Frey, editors. The Wild Carnivores of New Mexico. University of New Mexico Press, Albuquerque.
  7. Dragoo, J.W. and C. Hass. 2024. White-backed Hog-nosed skunk (Conepatus leuconotus). In J.-L. E. Catron and J. K. Frey, editors. The Wild Carnivores of New Mexico. University of New Mexico Press, Albuquerque.

Other

  1. Swann, E., C.C. Hass, S. Wolf, and D. Dalton. 2004. Infrared-triggered cameras for detecting wildlife: an evaluation and review. Wildlife Society Bulletin 32: 357-365.
  2. Hass, C. 2009. Competition and coexistence in sympatric bobcats and pumas. Journal of Zoology, (London) 278: 174-180.

  3. Soykan, C.U., L.A. Brand, L. Ries, J.C. Stromberg, C. Hass, D.A. Simmons, Jr., W.J.D. Patterson, and J.L. Sabo.  2012. Multitaxonomic diversity patterns along a  desert riparian-upland gradient. PloS ONE  7(1): e28235.     doi:10.1371/journal.pone.0028235.

  4. Chavarria, P.M., N.J. Silvy, C. Hass, and L. Kennedy. 2013. Post-fire succession of Montezuma Quail in a semi-desert grassland of southeast Arizona.  Proceedings of the National Quail Symposium 7:339–345.
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