Bureau of Reclamation (Moore and Ahlers), March 2018
A detailed analysis and discussion of flycatcher distribution and nesting along the Lower Rio Grande in New Mexico and Texas. Report notes the monitoring of 68 territories with 41 nests successfully fledging young.
Bureau of Reclamation (Moore and Ahlers), January 2018
A detailed analysis and discussion of flycatcher distribution and nesting along the Middle Rio Grande in New Mexico. Monitoring found a 15% decrease in territories, finding 302 territories containing 561 residents with an overall nesting success of 26%. Report notes that drought has led to increased dominance of tamarisk in the reach and thus increased use of lesser-quality tamarisk habitat for nesting.
2015 Utah Division of Wildlife Resources Southwestern Willow Flycatcher Monitoring Report
Utah Department of Natural Resources, May 2015
Survey results and discussion of eleven flycatcher territories along the Virgin River outside St. George, Utah.
2014 Utah Division of Wildlife Resources Southwestern Willow Flycatcher Monitoring Report
Utah Department of Natural Resources, May 2014
Survey results and discussion of thirteen flycatcher territories along the Virgin River outside St. George, Utah.
Clark, et. al, February 2014
Report discussing the status of the largest SWFL population in California, along the San Luis Rey River. Though limited parasitism was observed, trapping of brown-headed cowbirds was attempted and the report discusses that effort.
2013 Utah Division of Wildlife Resources Southwestern Willow Flycatcher Monitoring Report
Utah Department of Natural Resources, May 2013
Survey results and discussion of seven flycatcher territories along the Virgin River outside St. George, Utah.
Surveying for Southwestern Willow Flycatchers in Grand Canyon National Park, 2010-2012
National Park Service, August 2013
Survey and analysis of the declining SWFL population in the Grand after the arrival of the beetle.
Utah Department of Natural Resources, December 2012
A detailed report chronicling the status of the Virgin River SWFL population at the height of the initial tamarisk beetle population arrival and spread.
Bureau of Reclamation, September 2012
During the summer of 2012, presence/absence surveys along approximately 9.2 kilometers of riparian corridor within the Rio Grande and Santa Fe River basins in northern New Mexico were conducted. Four migrant Willow Flycatchers were documented at the La Cienga site and none were found within the Orilla Verde Recreation site. No endangered Southwestern Willow Flycatchers were observed at either site.
2012 Utah Division of Wildlife Resources Southwestern Willow Flycatcher Monitoring Report
Utah Department of Natural Resources, May 2012
Survey results and discussion of ten flycatcher territories along the Virgin River outside St. George, Utah.
Graber, et al., January 2012
A detailed analysis and discussion of flycatcher distribution and nesting along the Gila River in Arizona in 2011. Monitoring detected 183 pairs with 274 nesting attempts at 27 sites. Of the monitored nests with known outcomes, 36% were successful with an estimated 159 young fledged. Report notes that increased streamflow in late spring the previous year had the strongest relationship to increased territories the following year.
Utah Department of Natural Resources, 2010
A short summary report of monitoring results and recommendations for population management after the arrival of tamarisk beetle into the system.
Bureau of Reclamation, May 2008
A detailed analysis and discussion of flycatcher distribution and nesting along the Middle Rio Grande in New Mexico. Report notes the monitoring of 232 territories successfully fledging 315 young.
Southwestern Willow Flycatcher Final Survey and Nest Monitoring Report
Arizona Game and Fish Department. February 2008
A compilation of 10 years of survey data on Arizona populations of SWFL in the Salt River, Tonto Creek, Gila River, and San Pedro River study areas. 75% of nest were found in tamarisk but there was no significant differences in nest success in native, nonnative, and mixed habitats. “Observations at AGFD study areas demonstrate that the presence of flowing water, standing water, and saturated soil along lakes, rivers, and streams in the Southwest are important for flycatcher habitat growth and maintenance. Further, the presence of water can positively influence flycatcher recruitment and occupancy.”
Southwestern Willow Flycatcher Breeding Site and Territory Summary – 2004
Sogge, et al., December 2005
A comprehensive article discussing the SWFL population across its entire range.
Sogge, et al., 2004
Surveys finding one migrant flycatcher (subspecies unknown) and one SWFL breeding territory. A total of five YBC were detected.
Rourke, et al., 2004
A detailed analysis to document flycatcher distribution and abundance at 20 sites on 15 drainages in southern California in 2001. Surveys located 21 breeding pairs which when combined with other survey data suggest 146 pairs in California, a doubling of the population since 1993.
Hernandez, et al., 2001
Article documenting the population of SWFL in the Colorado River Delta in Mexico and discussing the need for future restoration of sites to maintain the species.