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Gary Witmer

   
 

Dr. Gary Witmer has been a Research Wildlife Biologist with NWRC since 1991. In the past, he worked on a wide array of wildlife species causing damage to forestry and agriculture. In recent years, however, he has focused heavily on rodent population and damage management, including both native and invasive rodent species. He has been involved in designing invasive rodent eradication strategies for islands, several of which have been successfully implemented in the Caribbean and Pacific regions.

NWRC Research Project: Development of Methods to Control Rodent Populations and Damage with an Emphasis on Invasive House Mice and Native Voles

Current Research

  • Rat toxicants
  • Mouse toxicants
  • Rodent barriers
  • Rat behavior
  • Gambian giant pouched rat toxicants
  • Gambian giant pouched rat attractants
  • Native rodent damage management

 

Education

  • Ph.D., Oregon State University, Wildlife Management, Forestry, Statistics
  • M.S., Purdue University, Wildlife Ecology
  • M.S., University of Michigan, General Biology
  • B.S., University of Michigan, General Biology

 

International Experience

  • Kenya (rodent management)
  • Costa Rica (carnivore predation)
  • Azores (rodent management)
  • Russia (forest wildlife damage management)
  • Cuba (rodent and invasive species management)
  • Australia and New Zealand (invasive rodent management)

 

Contact Information

  • Address: USDA/APHIS/Wildlife Services, NWRC, 4101 LaPorte Ave., Fort Collins, CO, 80521
  • Telephone: 970-266-6335
  • E-mail: Gary.W.Witmer@aphis.usda.gov

 

Recent Publications:

Shiels, A.B., W.C. Pitt, R.T. Sugihara, and G.W. Witmer. 2014. Biology and impacts of Pacific Island invasive species. 11. The Black Rat, Rattus rattus (Rodentia: Muridae). Pacific Science 68(2): 145-184. doi: 10.2984/68.2.1.

Pitt, W.C., G.W. Witmer, S.M. Jojola, and H. Sin. 2014. Potential citric acid exposure and toxicity to Hawaiian hoary bats (Lasiurus cinereus semotus) associated with Eleutherodactylus frog control. Ecotoxicology 23(3): 429-436. doi: 10.1007/s10646-014-1208-8.

Witmer, G.W. Evaluating habitat manipulations and rodenticides to protect seedlings from rodent damage at restored landfills in New York. 2014. Restoration Ecology 22(2): 178-184. doi: 10.1111/rec.12056.

Witmer, G., K. Horak, and R. Moulton. 2014. New rodenticides: an update on recent research trials. Proceedings of the Wildlife Damage Management Conference 15: 79-85.

Witmer, Gary W., N.P. Snow, R.S. Moulton. 2013. The effects of vitamin K1-rich plant foods on the efficacy of the anticoagulant rodenticides chlorophacinone and diphacinone, used against Montane Voles (Microtus montanus). International Journal of Pest Management 59(3): 205-210. doi: 10.1080/09670874.2013.816453

Savidge, J. A., M. W. Hopken, G. W. Witmer, S. M. Jojola, J. J. Pierce, P. W. Burke, and A. J. Piaggio. 2012. Genetic evaluation of an attempted Rattus rattus eradication on Congo Cay, U.S. Virgin Islands, identifies importance of eradication units. Biological Invasions 14:2343-2354.

Witmer, G. 2012. Eradication of invasive rodents on islands of the United States. Pages 91-92 in S. N. Frey, editor. Proceedings of the 14th Wildlife Damage Management Conference. The Wildlife Damage Management Working Group of The Wildlife Society, Nebraska City, NE. Wildlife Damage Management Working Group of The Wildlife Society.

Witmer, G. and P. Fuller. 2012. Vertebrate species introductions in the United States and its territories. Pages 85-86 in S. N. Frey, editor. Proceedings of the 14th Wildlife Damage Management Conference, Nebraska City, NE. The Wildlife Damage Management Working Group of The Wildlife Society.

Witmer, G., and W. Pitt. 2012. Invasive rodents in the United States: ecology, impacts, and management. Pages 47-75 in J. Blanco and A. Fernandes (Eds.), Invasive Species: Threats, Ecological Impacts and Control Methods. Nova Science Publishers, Inc., NY.

Witmer, G., T. R. Sheffels, and S. R. Kendrot. 2012. The introduction, impacts, and management of a large, invasive, aquatic rodent in the United States. Pages 49-89 in D. C. Abreu, and S. L. De Borbon, editors. Marshes : Ecology, Management and Conservation. Nova Science Publishers, Inc.

Witmer, G.W., N.P. Snow, R.S. Moulton, and J.L.Swartz. 2012. An assessment of seedling damage by wild house mice (Mus musculus) and wild deer mice (Peromyscus spp.). Canadian Journal of Forest Research 42:1168-1172. DOI: 10.1139/x2012-065.

2011

Fall, M. W., M. L. Avery, T. A. Campbell, P. J. Egan, R. M. Engeman, D. Pimentel, W. C. Pitt, S. A. Shwiff, and G. W. Witmer. 2011. Rodents and other vertebrate invaders in the United States. Pages 381-410 in D. Pimentel, editor. Biological invasions, 2nd edition. CRC Press, Boca Raton, Florida.

Snow, N. P., and G. W. Witmer. 2011. A field evaluation of a trap for invasive American bullfrogs. Pacific Conservation Biology 17:285-291.

Witmer, G. W. 2011. Rodent population management at Kansas City International Airport. Human-Wildlife Interactions 5:269-275

Witmer, G. W., and P. L. Fuller. 2011. Vertebrate species introductions in the United States and its territories. Current Zoology 57:559-567.

Witmer, G. W. and P. Hall. 2011. Attempting to eradicate invasive Gambian giant pouched rats (Cricetomys gambianus) in the United States: lessons learned. Pages 131-134 in C. R. Vietch, M. N. Clout,and D. R. Towns, editors. Island invasives: eradication and management. IUCN, Gland, Switzerland.

Witmer, G. W., J. Pierce, and W. C. Pitt. 2011. Eradication of invasive rodents on islands of the United States. Pages 135-138 in C. R. Vietch, M. N. Clout,and D. R. Towns, editors. Island invasives: eradication and management. IUCN, Gland, Switzerland.

 

 

 


 

 

 



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