Vertebrate Species

Southwestern Willow Flycatcher Status and Demography

This is a planned 5-Year study. USGS will conduct a 2-phased investigation to: 1) document the abundance and distribution of flycatchers in San Diego County; and 2) collect demographic data that will permit an assessment of the San Luis Rey River population within the larger contexts of MSPA and the state. During phase 1, drainage-wide surveys were conducted from Lake Henshaw downstream to College Boulevard in Oceanside between May and August 2015. These surveys were repeated in 2016, focused on sites outside of the San Luis Rey drainage that have historically supported resident southwestern willow flycatchers, including the Otay, Sweetwater, and San Diego Rivers, Santa Ysabel Creek, and Agua Hedionda. Phase 2 demographic data collection through monitoring started in 2016 and continued through 2017. In 2018, the focus is on monitoring flycatcher pairs in the upper San Luis Rey River study area, and banding and re-sighting color-banded flycatchers. Surveys will also be conducted outside the San Luis Rey drainage.
Project Groups
  • SDMMP28 Southwestern Willow Flycatcher surveys

Project Focus

Southwestern willow flycatcher

U.S. Geological Survey

Barbara Kus

Kris Preston

Project Protocol
Southwestern Willow Flycatcher Natural History Summary and Survey Protocol

The primary objective of this protocol is to provide a standardized survey technique to detect Southwestern Willow Flycatchers, determine breeding status, and facilitate consistent and standardized data reporting.

5MB SWFL Natural History and Survey Protocol.pdf
Strategic Elements
  • FY15-16 - 1.2
Project Location
San Diego
North-central, North-west
10, 5, 6, 7, 8, 9
File name Lead Author Year Type
Abundance and distribution of Southwestern Willow Flycatchers in San Diego County Howell, Scarlett L.; Kus, Barbara 2022 powerpoint presentation
Demography of Southwestern Willow Flycatchers in San Diego County, California Kus, Barbara; Howell, Scarlett L.; Mendia, Shannon 2022 powerpoint presentation
Distribution and Abundance of Southwestern Willow Flycatchers (Empidonax traillii extimus) on the Upper San Luis Rey River, San Diego County, California—2021 Data Summary Howell, Scarlett L.; Kus, Barbara 2022 report
Distribution and Demography of Southwestern Willow Flycatchers in San Diego County, 2015–19 Howell, Scarlett L.; Kus, Barbara; Mendia, Shannon 2022 report
Recording - January 2022 SDMMP Management and Monitoring Coordination Meeting Kus, Barbara; Howell, Scarlett L. 2022 recording