Cooperative Fish and Wildlife Research Units Program: Headquarters
Education, Research and Technical Assistance for Managing Our Natural Resources

Headquarters Staff Member

Brent H Sigafus

Assisting with the retrieval of a radio collar ripped off of a grizzly bear in Yellowstone National Park.

Safety and Occupational Health Specialist


My career started in 2000 working under Dr. Cecil Schwalbe as a university Science Technician working on Chiricahua Leopard Frogs and Bullfrogs at the University of Arizona. Over the next few years, I went from a university employee to a federal employee as a Biologist. My main research focus has been on amphibians of the Southwest under the USGS, Amphibian Research and Monitoring Initiative. My main work has been in Arizona, New Mexico, California, and Mexico with a focus on threatened and endangered amphibians, aquatic invasives, habitat change and alteration, population dynamics, and drought.

In 2009 I became an instructor under the USGS Firearms Safety Program instructing Specimen Collection and Defense Against Wild Animals. I worked my way to become the Regional Firearms Safety Manager for the Southwest, Northwest-Pacific Islands in 2012. A few years later I was asked to take over as the Safety Officer for the Southwest Biological Science Center pushing me even more into the safety world.

The transition to a full time Occupational Safety and Health Specialists seemed the logical choice. Not only do I instruct under the Firearms Safety Program but, instruct other courses like Wilderness First Aid, CPR/AED, Off Road Driving, Bear Spray, and other safety courses that our field biologists use to stay safe while working.

Research Publications Publication Date
Oyler-McCance, S.J., Ryan, M.J., Sullivan, B.K. et al. Genetic connectivity in the Arizona toad (Anaxyrus microscaphus): implications for conservation of a stream dwelling amphibian in the arid Southwestern United States. Conserv Genet (2024). | Abstract | Download | Publisher Website March 2024
Hossack, Blake R., Oja, Emily B., Owens, Audrey K., Hall, David, Cobos, Cassidi, Crawford, Catherine L., Goldberg, Caren S., et al. 2023. “ Empirical Evidence for Effects of Invasive American Bullfrogs on Occurrence of Native Amphibians and Emerging Pathogens.” Ecological Applications 33(2): e2785. | Abstract | Publisher Website December 2022
Hossack, B. R., P. E. Howell, A. Owens, C. Cobos, C. S. Goldberg, D. Hall, S. Hedwall, S. MacVean, M. McCaffery, A. H. McCall, C. Mosley, E. B. Oja, J. C. Rorabaugh, B. H. Sigafus, and M. J. Sredl. 2022. Identifying factors linked with population persistence: Lessons learned from 25 years of amphibian translocations. Global Ecology and Conservation 35: e02078. | Abstract | Download | Publisher Website March 2022
Hossack, B. R., Hall, D., Crawford, C. L., Goldberg, C. S., Muths, E., Sigafus, B. H., & Chambert, T. (2023). Successful eradication of invasive American bullfrogs leads to coextirpation of emerging pathogens. Conservation Letters, 00, e12970. | Abstract | Download | Publisher Website July 2023