Cooperative Research Units
Education, Research And Technical Assistance For Managing Our Natural Resources
Home | Intranet | Digital Measures | Help

Dr. Ashton Drew

Research Publications

  • Drew, C.A., M. Eddy, T.J. Kwak, W.G. Cope, and T. Augspurger. 2018. Hydrologic characteristics of freshwater mussel habitat: novel insights from modeled flows. Freshwater Science 37: 343-356. DOI: 10.1086/697947
  • Pickens, B. P., R. S. Mordecai, C. A. Drew, L. B. Alexander-Vaughn, A. S. Keister, H. L.C. Morris, J. A. Collazo. 2017. Indicator-driven Conservation Planning across Terrestrial, Freshwater Aquatic, and Marine Ecosystems of the South Atlantic, USA. J. Fish and Wildlife Management 8:219-233. doi:10.3996/062016-JFWM-044.
  • C. Ashton Drew, Rickie White, Bradley Pickens and Jaime Collazo. 2016. Assessment of South Atlantic Landscape Conservation Cooperative Terrestrial Indicators. Final Report to USFWS-SALCC.

  • Drew, C. A., J. Stocking, and J. A. Collazo. Strategic Decision Planning for Endangered Species Recovery in Puerto Rico. North Carolina Cooperative Extension Service Technical Bulletin.
  • Drew, C. A. and J. A. Collazo. 2014. Bayesian networks as a framework to step-down and support Strategic Habitat Conservation of data-poor species: A case study with King Rail (Rallus elegans) in Eastern North Carolina and Southeastern Virginia. NCARS Technical Bulletin.
  • Alexander-Vaughn, L. B., J. A. Collazo, and
    C. A. Drew. 2014. Strategic Conservation Planning for the Eastern North Carolina/Southeastern Virginia Strategic Habitat Conservation Team. NCARS Technical Bulletin 337, North Carolina State University.
  • Rogers, S. L., J. A. Collazo, and C. A. Drew. 2013. Nest occurrence and survival of King Rails in fire-managed coastal marshes in North Carolina and Virginia. J. Field Ornithology 84:355-366/ Abstract | 
  • Rogers, S. L., J. A. Collazo, and C. A. Drew. 2013. King Rail Occupancy and Abundance
    in Fire Managed Coastal Marshes in North Carolina and Virginia. Waterbirds 36:179-188.
  • Hightower J.E., J. E. Harris, J. K. Raabe, P. Brownell, and C. A. Drew. 2012. A Bayesian habitat suitability model for spawning American shad in southeastern United States rivers. Journal of Fish and Wildlife Management 3(2):184-198; e1944-687X. doi: 10.3996/082011-JFWM-047. Abstract |  Download  |  Publisher Website | 
  • Drew, C. A. and J. A. Collazo. 2011. Expert knowledge as a foundation for management of secretive species and their habitat (Chapter 5). Perera A.H., Drew C.A., and Johnson C,J. (eds), Expert Knowledge and its Application in Landscape Ecology. Springer, New York.

Current Staff

Federal Staff: 101

Masters Students: 239

Phd Students: 154

Post Docs: 55

University Staff: 241

5 Year Summary

Students graduated: 710

Scientific Publications: 1961

Presentations: 4427


Contact Us

Cooperative Research Units Program Headquarters Reston, VA 20192 Phone: (703) 648 - 4260 Fax: (703) 648 - 4269 Our University Web Site


John Organ
CRU Chief John Organ processing a Canada lynx kitten during a long term research collaboration between the Maine Department of Inland Fisheries and Wildlife and the Fish and Wildlife Service.

John F. Organ is the Chief of the U.S.G.S. Cooperative Fish and Wildlife Research Units. He was Chief of Wildlife and Sport Fish Restoration for the Northeast Region of the U.S. Fish and Wildlife Service from 2005 to 2014, and worked in the FWS’s Ecological Services and National Wildlife Refuge programs during his 35 year career. He is also an Adjunct Associate Professor of Wildlife Conservation at the University of Massachusetts, Amherst, Michigan State University, and Andres Bello University in Santiago, Chile. He is a certified Wildlife Biologist and Past President and Fellow of The Wildlife Society. He is also a Professional Member of the Boone and Crockett Club and a Senior Specialist in the Fulbright Scholar Program. He is a member of the IUCN Otter Specialist and Sustainable Use and Livelihoods Groups, and an instructor and Advisory Board member of the Conservation Leaders for Tomorrow Program. He is also a consultant to the Peru Forest Sector Initiative where he is assisting the Peruvian government in training biologists and developing wildlife regulations. He advises M.S. and Ph.D. students studying carnivores and human dimensions in Africa, Canada, Chile, and the U.S. and teaches graduate courses in Wildlife Management and Conservation and Human Dimensions of Wildlife Conservation.


  1. U.S. Geological Survey
  2. U.S. Geological Survey - Ecosystems
  3. U.S. Department of the Interior

Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey