thumbnail

Southwestern Willow Flycatcher (Empidonax traillii extimus) Surveys at the City of Carlsbad Preserve, San Diego County, California—2025 Data Summary

Data Report 1223
Ecosystems Mission Area—Species Management Research Program
By:  and 
https://doi.org/10.3133/dr1223

Links

Executive Summary 

We surveyed for Southwestern Willow Flycatchers (Empidonax traillii extimus; flycatcher) at five survey areas within the City of Carlsbad Preserve, Carlsbad, California, in 2025. Three flycatcher surveys were completed between May 16 and June 30, 2025. One transient flycatcher was observed at the Lake Calavera survey area in the City of Carlsbad Preserve in 2025.

Suggested Citation

Allen, L.D., and Kus, B.E., 2026, Southwestern Willow Flycatcher (Empidonax traillii extimus) surveys at the city of Carlsbad Preserve, San Diego County, California—2025 data summary: U.S. Geological Survey Data Report 1223, 12 p., https://doi.org/10.3133/dr1223.

ISSN: 2771-9448 (online)

Study Area

Table of Contents

  • Acknowledgments
  • Executive Summary
  • Introduction
  • Purpose and Scope
  • Methods
  • Results
  • Summary
  • References Cited
Publication type Report
Publication Subtype USGS Numbered Series
Title Southwestern Willow Flycatcher (Empidonax traillii extimus) surveys at the city of Carlsbad Preserve, San Diego County, California—2025 data summary
Series title Data Report
Series number 1223
DOI 10.3133/dr1223
Publication Date March 19, 2026
Year Published 2026
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Western Ecological Research Center
Description vi, 12 p.
Country United States
State California
County San Diego County
Other Geospatial City of Carlsbad Preserve
Online Only (Y/N) Y
Additional publication details