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This dataset represents point observations of Willow Flycatchers (Empidonax traillii) between 1963 and 2008, compiled from a variety of data sources by the Avian Knowledge Network. The southwestern subspecies (Empidonax traillii extimus) are designated as an endangered species by the USFWS; however, this subspecies is not distinguished in this dataset. This dataset is intended to characterize the general areas in which this species has been observed. This dataset is not intended for rigorous scientific analysis due to the varying quality and precision of the underlying data. Coordinates should be regarded as approximate due to the wide range in projects and protocols from which these data were obtained. The records...
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These data are an extraction of Willow flycatcher (Empidonax traillii) from the California Wildlife Habitat Relationship (CWHR) system dataset.The following information describes, and should always accompany, the California Department of Fish and Game's California Wildlife Habitat Relationship System (CWHR) species distribution data.The data is organized into four folders according to the four major taxonomic groups in CWHR: amphibians, reptiles, birds and mammals.  Each species is represented by a single shapefile and is named according to its 4 digit alpha-numeric CWHR ID code.  The file lookup.xls contains a record for each species including its CWHR ID, scientific name, common name, and  range map revision...
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These data identify, in general, the areas of FINAL critical habitat for Empidonax traillii extimus (southwestern willow flycatcher).
Saltcedars (Tamarix spp., Tamaricaceae) (SC), are exotic, invasive shrubs to medium trees native to the Old World. In riparian ecosystems of the western United States, SC replaces native plant communities, degrades wildlife habitat, reduces biodiversity, alters stream channel morphology, uses large quantities of groundwater, increases wildfire frequency, reduces recreational and agricultural usage, and probably has contributed to the decline of many wildlife and fish species. In recent years, the southwestern willow flycatcher (Empidonax trailii extimus) (sw WIFL) has begun nesting extensively in SC in some of its major breeding areas in Arizona, but not in other areas, since SC has replaced its native willow nest...
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This dataset depicts Willow flycatcher habitat for National Forests in the Sierra Nevada Range. Meadows were derived from the Sierra-wide meadow vegetation layer (MDVG) by reselecting for wet meadows with woody vegetation (WW) and without woody vegetation (WO). Some meadows were derived from reselecting willow-dominated vegetation from the existing vegetation (EVEG) layer. Initially, all meadows greater than or equal to 15 acres were categorized as Emphasis (E), and meadows smaller than 15 acres were categorized as Small (S). Meadows identified as containing a known willow flycatcher observation, which are identified as points in coverage WIFLPT_9, were then categorized as Occupied (O). Item WFLY ID provides a link...
An understanding of individuality in animal vocalizations can assist in tracking individuals spatially and temporally, and is particularly useful for species of conservation concern. We determined whether fitz bew vocalizations of the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus) showed vocal individuality, assessed the differences in vocal individuality among three populations, and tested the ability of predictive vocalization models to reidentify individuals. Fitz bew vocalizations were recorded from two populations in Arizona (Roosevelt Lake and San Pedro River) and one in California (Kern River). Individuality was determined using discriminant function analysis (DFA) and trained artificial...
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Distribution of Willow Flycatcher productivity at MAPS stations during the period 1992-2008 throughout Midwestern states (plus 250km buffer).
Although polygyny can potentially increase male reproductive success, the benefits of this strategy could be offset by losses to extra-pair paternity or reduced offspring survival. We developed microsatellite markers to assess the influence of extrapair offspring (EPO) on reproductive success and paternity in monogamous and polygynous pairs of the facultatively polygynous Southwestern Willow Flycatcher (Empidonax traillii extimus). Based on genotypes of 140 offspring from 56 clutches over six years, 14% of nestlings in our study population were extra-pair offspring, with 23% of all successful nests containing at least one EPO. We found that polygynous males produced 2.11 0.35 offspring per season, compared to 1.15...
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This dataset depicts Willow flycatcher habitat for National Forests in the Sierra Nevada Range. Meadows were derived from the Sierrawide meadow vegetation layer (MDVG) by reselecting for wet meadows with woody vegetation (WW) and without woody vegetation (WO). Some meadows were derived from reselecting willow-dominated vegetation from the existing vegetation (EVEG) layer. Initially, all meadows greater than or equal to 15 acres were categorized as Emphasis (E), and meadows smaller than 15 acres were categorized as Small (S). Meadows identified as containing a known willow flycatcher observation, which are identified as points in coverage WIFLPT_9, were then categorized as Occupied (O). Item WFLY_ID provides a link...
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Distribution of Willow Flycatcher adult captures at MAPS stations during the period 1992-2008 throughout Midwestern states (plus 250km buffer).


    map background search result map search result map CWHR Willow flycatcher species distribution, California FINAL Critical Habitat for Empidonax Traillii Extimus (Southwestern Willow Flycatcher) Willow Flycatcher geographic range Willow Flycatcher (STAPI) Willow Flycatcher (ADULT) BBS Willow Flycatcher Willow Flycatcher observations Sierra Nevada Willow Flycatcher Habitat by the United States Forest Service Sierra Nevada U.S. Forest Service (USFS) Willow Flycatcher Habitat Sierra Nevada Willow Flycatcher Habitat by the United States Forest Service Sierra Nevada U.S. Forest Service (USFS) Willow Flycatcher Habitat CWHR Willow flycatcher species distribution, California FINAL Critical Habitat for Empidonax Traillii Extimus (Southwestern Willow Flycatcher) Willow Flycatcher (STAPI) Willow Flycatcher (ADULT) BBS Willow Flycatcher Willow Flycatcher observations Willow Flycatcher geographic range