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Distribution and Abundance of Least Bell's Vireos (Vireo bellii pusillus) and Southwestern Willow Flycatchers (Empidonax traillii extimus) on the Middle San Luis Rey River, San Diego County, Southern California in 2021

Dates

Publication Date
Start Date
2021-04-13
End Date
2021-07-13

Citation

Kus, B.E., and Allen, L.D., 2022, Distribution and abundance of Least Bell's Vireos (Vireo bellii pusillus) and Southwestern Willow Flycatchers (Empidonax traillii extimus) on the Middle San Luis Rey River, San Diego County, Southern California in 2021: U.S. Geological Survey data release, https://doi.org/10.5066/P9UPGVPG.

Summary

We surveyed for Least Bell’s Vireos (Vireo bellii pusillus; vireo) and Southwestern Willow Flycatchers (Empidonax traillii extimus; flycatcher) along the San Luis Rey River, between College Boulevard in Oceanside and Interstate 15 in Fallbrook, California (middle San Luis Rey River), in 2021. Surveys were conducted from April 13 to July 14 (vireo) and from May 18 to July 13 (flycatcher). We found 180 vireo territories, at least 125 of which were occupied by pairs. The vireo population size decreased by 6 percent from 2020 to 2021. One resident flycatcher, of undetermined breeding status, was observed in the survey area in 2021. He was detected from May 20 to June 4, 2021, and no evidence of pairing or nesting was observed. These data [...]

Contacts

Originator :
Barbara E Kus, Lisa D Allen
Metadata Contact :
Lisa D Allen
Distributor :
U.S. Geological Survey - ScienceBase
SDC Data Owner :
Western Ecological Research Center
USGS Mission Area :
Ecosystems

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Photograph showing Least Bell’s Vireo (Vireo bellii pusillus).PNG
“ Photo Credit: Alexandra Houston (USGS)”
thumbnail 1.58 MB image/png
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Material Request Instructions

The authors of these data require that data users contact them regarding intended use and to assist with understanding limitations and interpretation. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Purpose

The purpose of this study was to document the status of vireos and flycatchers along an 18 kilometer stretch of the San Luis Rey River from College Boulevard in Oceanside, California, east to Interstate 15. These data, when compared with data from other sites, will inform natural resource managers about the status of these endangered species on the San Luis Rey River and guide modification of land-use and management practices as appropriate to ensure the species' continued existence.
 Photo Credit: Alexandra Houston (USGS)
Photo Credit: Alexandra Houston (USGS)

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DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/P9UPGVPG

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