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A Natural History Summary and Survey Protocol for the Southwestern Willow Flycatcher

Document ID: 
sogge-ahlers-sferra-2010
Year Published: 
2010
Summary: 

The Southwestern Willow Flycatcher (Empidonax traillii extimus) has been the subject of substantial research, monitoring, and management activity since it was listed as an endangered species in 1995. When proposed for listing in 1993, relatively little was known about the flycatcher’s natural history, and there were only 30 known breeding sites supporting an estimated 111 territories rangewide (Sogge and others, 2003a). Since that time, thousands of presence/absences surveys have been conducted throughout the historical range of the flycatcher, and many studies of its natural history and ecology have been completed. As a result, the ecology of the flycatcher is much better understood than it was just over a decade ago. In addition, we have learned that the current status of the flycatcher is better than originally thought: as of 2007, the population was estimated at approximately 1,300 territories distributed among approximately 280 breeding sites (Durst and others, 2008a).

Reference Information: 

Sogge, M.K., D. Ahlers, and S.J. Sferra. 2010. A Natural History Summary and Survey Protocol for the Southwestern Willow Flycatcher. Techniques and Methods 2A-10. Chapter 10 of Section A, Biological Science, Book 2, Collection of Environmental Data: U.S. Geological Survey, Bureau of Reclamation, and the U.S. Fish and Wildlife Service.

Document: 
Document Type: 

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The information appearing on this Web site is for general informational purposes only. Every effort is made to provide accurate and useful information.
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