Southwestern Willow Flycatcher (Empidonax traillii extimus) Surveys and Nest Monitoring in San Diego County, California (ver. 3.0, January 2024)
Dates
Publication Date
2022-09-13
Start Date
2015
End Date
2022
Revision
2023-01-27
Last Revision
2024-01-26
Citation
Howell, S.L., and Kus, B.E., 2022, Southwestern willow flycatcher (Empidonax traillii extimus) surveys and nest monitoring in San Diego County, California (ver. 3.0, January 2024): U.S. Geological Survey data release, https://doi.org/10.5066/P96VC5Y4.
Summary
Data presented are results of surveys and monitoring for Southwestern Willow Flycatcher (Empidonax traillii extimus) in San Diego County, California. These data were collected to assess Southwestern Willow Flycatcher abundance and distribution in San Diego County. Surveys were conducted in various years at 33 locations along 10 drainages in San Diego County, including portions of Agua Hedionda Creek, Cottonwood Creek, Escondido Creek, Los Penasquitos Creek, Otay River, San Diego River, San Dieguito River, San Luis Rey River, Sweetwater River, and Tijuana River. From 2016-19, Southwestern Willow Flycatcher territories were monitored at three locations along the upper San Luis Rey River (Cleveland National Forest, Rey River Ranch, Vista [...]
Summary
Data presented are results of surveys and monitoring for Southwestern Willow Flycatcher (Empidonax traillii extimus) in San Diego County, California. These data were collected to assess Southwestern Willow Flycatcher abundance and distribution in San Diego County. Surveys were conducted in various years at 33 locations along 10 drainages in San Diego County, including portions of Agua Hedionda Creek, Cottonwood Creek, Escondido Creek, Los Penasquitos Creek, Otay River, San Diego River, San Dieguito River, San Luis Rey River, Sweetwater River, and Tijuana River. From 2016-19, Southwestern Willow Flycatcher territories were monitored at three locations along the upper San Luis Rey River (Cleveland National Forest, Rey River Ranch, Vista Irrigation District) to determine breeding productivity, survival, and dispersal. Nesting data were compiled to present seasonal productivity for each Southwestern Willow Flycatcher pair. When possible, adults and nestlings in the monitoring area were banded with unique color combinations to identify individuals on subsequent visits to provide data on survivorship and dispersal patterns.
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Related External Resources
Type: Related Primary Publication
Distribution and abundance of Southwestern Willow Flycatchers (Empidonax traillii extimus) on the Upper San Luis Rey River, San Diego County, California—2021 data summary
Distribution and abundance of Southwestern Willow Flycatchers (Empidonax traillii extimus) on the upper San Luis Rey River, San Diego County, California—2022 data summary
Distribution and Abundance of Southwestern Willow Flycatchers (Empidonax traillii extimus) on the Upper San Luis Rey River, San Diego County, California—2020 Data Summary
Questions pertaining to the intended use of, or assistance with understanding limitations or interpretation of these data are to be directed to the individuals/organization listed in the Point of Contact section. 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 determine the size and distribution of Southwestern Willow Flycatcher populations within San Diego County, and to collect demographic data to better understand population trends and conservation needs of flycatchers. This study was part of the San Diego Management and Monitoring Program’s (SDMMP) regional monitoring and management of sensitive species and habitats on conserved lands in western San Diego County. The SDMMP coordinates science-based biological management and monitoring of lands in San Diego that have been conserved through various conservation planning and mitigation efforts. The results of this study will be used by managers to develop specific management goals and objectives to ensure the species’ continued existence in San Diego County.
