thumbnail

Least Bell’s Vireo (Vireo bellii pusillus) and Southwestern Willow Flycatcher (Empidonax traillii extimus) Surveys in the Sepulveda Dam Basin, Los Angeles County, California—2022 Data Summary

Data Report 1177
Ecosystems Mission Area—Species Management Research Program
Prepared in cooperation with the U.S. Army Corps of Engineers
By:  and 
https://doi.org/10.3133/dr1177

Links

Executive Summary

We surveyed for Least Bell’s Vireos (Vireo bellii pusillus; vireo) and Southwestern Willow Flycatchers (Empidonax traillii extimus; flycatcher) along Bull Creek, Haskell Creek, and the Los Angeles River (Sepulveda Dam project area) in Los Angeles County, California, in 2022. Four vireo surveys were completed from April 26 to July 14, and three flycatcher surveys were completed from May 19 to July 14. We detected 10 territorial male vireos, 5 of which were confirmed as paired, and 2 transient vireos. Of the 10 territorial vireos, 70 percent were detected along the Los Angeles River, 20 percent along Bull Creek, and 10 percent along Haskell Creek. Of the vireos detected, 80 percent were in habitats characterized as mixed willow, and most vireos were detected in habitats with greater than 50-percent native plant cover. One transient flycatcher was observed in the survey area in 2022.

Suggested Citation

Pottinger, R.E., and Kus, B.E., 2023, Least Bell’s Vireo (Vireo bellii pusillus) and Southwestern Willow Flycatcher (Empidonax traillii extimus) surveys in the Sepulveda Dam Basin, Los Angeles County, California—2022 data summary: U.S. Geological Survey Data Report 1177, 8 p., https://doi.org/10.3133/dr1177.

ISSN: 2771-9448 (online)

Study Area

Table of Contents

  • Acknowledgements
  • Executive Summary
  • Introduction
  • Methods
  • Results
  • Summary
  • References Cited
Publication type Report
Publication Subtype USGS Numbered Series
Title Least Bell’s Vireo (Vireo bellii pusillus) and Southwestern Willow Flycatcher (Empidonax traillii extimus) surveys in the Sepulveda Dam Basin, Los Angeles County, California—2022 data summary
Series title Data Report
Series number 1177
DOI 10.3133/dr1177
Year Published 2023
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Western Ecological Research Center
Description vii, 8 p.
Country United States
State California
County Los Angeles County
Other Geospatial Sepulveda Dam project area
Online Only (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details