thumbnail

Distribution and Abundance of Least Bell’s Vireos (Vireo bellii pusillus) and Southwestern Willow Flycatchers (Empidonax traillii extimus) at the San Antonio Dam, Los Angeles and San Bernardino Counties, California—2021 Data Summary

Data Report 1148
Ecosystems Mission Area-Species Management Research Program
By:  and 
https://doi.org/10.3133/dr1148

Links

Executive Summary

We surveyed for Least Bell’s Vireos (Vireo bellii pusillus; vireo) and Southwestern Willow Flycatchers (Empidonax traillii extimus; flycatcher) at the San Antonio Dam near Upland, California, in 2021. Four vireo surveys were conducted between April 16 and July 15, 2021, and three flycatcher surveys were conducted between May 27 and July 15, 2021.

We detected one transient vireo and one transient flycatcher. No territorial vireos or flycatchers were observed. The vireo was found in riparian scrub habitat dominated by native mule fat (Baccharis salicifolia), whereas the flycatcher was using habitat dominated by non-native tamarisk (Tamarix ramosissima).

Suggested Citation

Howell, S.L., and Kus, B.E., 2022, Distribution and abundance of Least Bell’s Vireos (Vireo bellii pusillus) and Southwestern Willow Flycatchers (Empidonax traillii extimus) at the San Antonio Dam, Los Angeles and San Bernardino Counties, California—2021 Data summary: U.S. Geological Survey Data Report 1148, 8 p., https://doi.org/10.3133/dr1148.

ISSN: 2771-9448 (online)

Study Area

Table of Contents

  • Acknowledgments 
  • Executive Summary 
  • Introduction 
  • Methods 
  • Results
  • Summary 
  • References Cited
Publication type Report
Publication Subtype USGS Numbered Series
Title Distribution and abundance of Least Bell’s Vireos (Vireo bellii pusillus) and Southwestern Willow Flycatchers (Empidonax traillii extimus) at the San Antonio Dam, Los Angeles and San Bernardino Counties, California—2021 Data summary
Series title Data Report
Series number 1148
DOI 10.3133/dr1148
Year Published 2022
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, San Bernardino County
Other Geospatial San Antonio Dam
Online Only (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details