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

Washington Project

Evaluating and mitigating the effects of brown treesnakes on Guam's birds

February 2019 - June 2024


Participating Agencies

  • Navy, Joint Region Marianas

The brown treesnake is an invasive species on the island of Guam and is responsible for the local extinction of much of Guam’s avifauna. Control of brown treesnakes is critical to conservation of the remaining native fauna and to the eventual reintroduction of many native species. Monitoring of brown treesnake populations will be key to informing control and reintroduction activities. Refinement of field and statistical methodologies is needed to provide information on brown treesnake populations, and this information needs to be fit within system models to inform both control and reintroduction activities. The U.S. Geological Survey Washington Cooperative Fish and Wildlife Research Unit plans to undertake a multi-year collaboration with the U.S. Navy on Guam, in addition to the U.S. Geological Survey Fort Collins Science Center, and U.S. Department of Agriculture APHIS Wildlife Services, to develop methods for monitoring brown treesnakes and to fit that information within management models to inform both brown treeesnake control activities and reintroduction of native fauna.

Presentations Presentation Date
Sipe, H.A., Paxton, E.H., Yackel Adams, A. A., and Converse, S.J. 2023. Developing a framework to guide vertebrate restoration in Guam. Brown Treesnake Technical Working Group. 14 November. November 2023
Mistry, K., Converse, S., Amburgey, S., Yackel Adams, A., Siers, S. 2023. Dynamic Monitoring and Management of Brown Treesnakes: Modeling Removal Data to Identify Optimal Eradication Strategies. Brown Treesnake Technical Working Group Annual Meeting, Tamuning, Guam, 14 November 2023. November 2023
Mistry K, SJ Converse, S Amburgey, A Yackel Adams, and S Siers. 2024. Dynamic monitoring and management of brown treesnakes: modeling removal data to identify optimal eradication strategies. Mariana Islands Conservation Conference, Guam, 26 February. February 2024
Amburgey SM, AA Yackel-Adams, B Gardner, and SJ Converse. 2020. Camera traps for early detection and rapid response and management of an invasive reptile. World Congress of Herpetology, Dunedin, New Zealand. 5-10 January. January 2020
Amburgey SM, AA Yackel Adams, B Gardner, and SJ Converse. 2019. Assessing spatial capture-recapture models for unmarked individuals when estimating density of invasive brown treesnakes on Guam. American Fisheries Society & The Wildlife Society Joint Conference, Reno, Nevada. 29 September - 3 October. September 2019
Theses and Dissertations Publication Date
Sipe, Hannah A. 2023. Exploring complexity, uncertainty, and risk in avian reintroduction decisions through structured decision making. Ph.D. Dissertation, University of Washington, Seattle. December 2023