Willow flycatcher

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Willow flycatcher
Southwestern Willow Flycatcher.jpg
E. t. extimus
About this sound Empidonax traillii call 
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Tyrannidae
Genus: Empidonax
Species: E. traillii
Binomial name
Empidonax traillii
(Audubon, 1828)
Summer breeding and winter ranges of willow flycatcher subspecies from USGS southwestern willow flycatcher survey protocol

The willow flycatcher (Empidonax traillii) is a small insect-eating, neotropical migrant bird of the tyrant flycatcher family. There are four subspecies of the willow flycatcher currently recognized, all of which breed in North America (including three subspecies which breed in California).[2] Empidonax flycatchers are almost impossible to tell apart in the field so biologists use their songs to distinguish between them.[3] The binomial commemorates the Scottish zoologist Thomas Stewart Traill.

Description and ecology[edit]

Adults have brown-olive upperparts, darker on the wings and tail, with whitish underparts; they have an indistinct white eye ring, white wing bars and a small bill. The breast is washed with olive-gray. The upper part of the bill is gray; the lower part is orangish. At one time, this bird and the alder flycatcher (Empidonax alnorum) were considered to be a single species, Traill's flycatcher. The willow and alder flycatchers were considered the same species until the 1970s. Their song is the only reliable method to tell them apart in the field.[4]

Standard Measurements[5][6]
length 130–150 mm (5.2–6 in)
weight 13.5 g (0.48 oz)
wingspan 220 mm (8.5 in)
wing 68.7–75.6 mm (2.70–2.98 in)
tail 54–64.5 mm (2.13–2.54 in)
culmen 10.5–12.3 mm (0.41–0.48 in)
tarsus 15.5–18.0 mm (0.61–0.71 in)

Their breeding habitat is deciduous thickets, especially willows and often near water, across the United States and southern Canada. They make a cup nest in a vertical fork in a shrub or tree.

These neotropical birds migrate to Mexico and Central America, and in small numbers as far south as Ecuador in South America, often selecting winter habitat near water. Willow flycatchers travel approximately 1,500–8,000 km (930–4,970 mi) each way between wintering and breeding areas.[7]

They wait on a perch near the top of a shrub and fly out to catch insects in flight, also sometimes picking insects from foliage while hovering. They may eat some berries.

This bird's song is a sneezed fitz-bew. The call is a dry whit.

This bird competes for habitat with the alder flycatcher where their ranges overlap.

Subspecies[edit]

The subspecies are best distinguished from each other by their songs.[8] In addition, the four subspecies have significant genetic differences based on mitochondrial DNA analysis.[9] Their winter ranges have been elucidated using mitochondrial DNA genetic studies of 172 birds sampled in winter combined with plumage coloration and morphological differences.[2]

The four subspecies of the willow flycatcher are:[7][10]

E. t. brewsteri – The little willow flycatcher[edit]

The little willow flycatcher (E.t. brewsteri) is the Pacific slope subspecies of the willow flycatcher. Described by Oberholser in 1918, it breeds in California from Tulare County[11] north, along the western side of the Sierra Nevada and Cascades, extending to the coast in northern California.[12]

E.t. adastus[edit]

The Great Basin/Northern Rockies subspecies of the willow flycatcher (E.t. adastus) breeds in California east of the Sierra/Cascade axis, from the Oregon border into Modoc County and possibly into northern Inyo County. Populations at high elevation just east of the Sierra Nevada crest but south of Modoc County are assumed to be E.t. brewsteri. There has been very little study of E.t. adastus in California.[12] It was described by Oberholser in 1932.

E. t. extimus – The southwestern willow flycatcher[edit]

The southwestern willow flycatcher (E t. extimus) is a federally endangered subspecies. It was listed in 1995, at which time it was known to breed at only about 75 sites in riparian areas throughout the American southwest. The known breeding population was estimated at between 300 and 500 pairs.[7] Breeding occurs from near sea level on the Santa Margarita River to 2,640 ft (800 m) at the South Fork Kern River and 3,000 ft (910 m) at upper San Luis Rey River in California and to over 8,530 ft (2,600 m) in Arizona and southwestern Colorado. The largest remaining population in California is on the South Fork Kern River, Kern County. In southern California, this subspecies breeds on the San Luis Rey River, at Camp Pendleton, the Santa Margarita River and Pilgrim, De Luz, French, and Las Flores creeks; as well as on the Santa Ynez River. In 1996, breeding was confirmed along the Arizona side of the lower Colorado River at Lake Mead Delta and at Topock Marsh. Examination of museum specimens of 578 migrating and wintering E.t. extimus indicating that Guatemala to Costa Rica constitutes the main winter range. The population is declining due to habitat loss.[12] The San Pedro River Preserve was purchased by the Nature Conservancy to preserve habitat for this subspecies. North American beavers (Castor canadensis) are thought to play a critical role in widening riparian width, openings in dense vegetation, and retention of surface water through the willow flycatcher breeding season.[13] This subspecies was described by A.R. Phillips in 1948.

E. t. traillii[edit]

The eastern nominate subspecies of the willow flycatcher (E. t. traillii) was described by Audubon in 1828. It breeds from the eastern coast of the United States to the western Rocky Mountains.[7]

References[edit]

  1. ^ BirdLife International (2012). "Empidonax traillii". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013. 
  2. ^ a b Paxton, Eben H.; Unitt, Philip; Sogge, Mark K.; Whitfield, Mary; Keim, Paul (2011). "Winter Distribution of Willow Flycatcher Subspecies". The Condor 113 (3): 608–618. doi:10.1525/cond.2011.090200. Retrieved 17 February 2013. 
  3. ^ "Southwestern Willow Flycatcher (Empidonax traillii extimus)". U.S. Fish and Wildlife Service Nevada Office. Retrieved 16 February 2013. 
  4. ^ "Willow flycatcher". All About Birds. Cornell Lab of Ornithology. Retrieved 16 February 2013. 
  5. ^ Godfrey, W. Earl (1966). The Birds of Canada. Ottawa: National Museum of Canada. p. 255. 
  6. ^ Sibley, David Allen (2000). The Sibley Guide to Birds. New York: Knopf. p. 326. ISBN 0-679-45122-6. 
  7. ^ a b c d Sogge, Mark K.; Marshall, Robert M.; Sferra, Susan J.; Tibbitts, Timothy J. (May 1997). A Southwestern Willow Flycatcher Natural History Summary and Survey Protocol: Technical Report NPS/NAUCPRS/NRTR-97/12 (Report). National Park Service and Northern Arizona University. p. 37. http://sbsc.wr.usgs.gov/cprs/research/projects/swwf/protocol.pdf. Retrieved 17 February 2012.
  8. ^ Sedgwick, James A. (2001). "Geographic Variation in the Song of Willow Flycatchers: Differentiation between Empidonax traillii adastus and E. t. extimus". The Auk 118 (2): 366–379. doi:10.1642/0004-8038(2001)118[0366:GVITSO]2.0.CO;2. Retrieved 17 February 2012. 
  9. ^ Paxton, E.H. (2000). Molecular genetic structuring and demographic history of the Willow Flycatcher (M.Sc.). Flagstaff, Arizona: Northern Arizona University. Retrieved 17 February 2012. 
  10. ^ Gill, F.; Donsker, D., eds. (2014). "IOC World Bird List (v 4.4)". doi:10.14344/IOC.ML.4.4. Retrieved 14 November 2014. 
  11. ^ (S. Laymon, pers. comm.)
  12. ^ a b c Craig, Diane; Williams, Pamela L. (1998). "Willow Flycatcher (Empidonax traillii)". The Riparian Bird Conservation Plan: a strategy for reversing the decline of riparian-associated birds in California. California Partners in Flight. (PRBO Conservation Science). http://www.prbo.org/calpif/htmldocs/species/riparian/willow_flycatcher.htm. Retrieved 16 February 2013.
  13. ^ Finch, Deborah M.; Stoleson, Scott H. (2000). Status, ecology, and conservation of the Southwestern Willow Flycatcher. Gen. Tech. Rep. RMRS-GTR-60. (Report). Ogden, Utah: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. pp. 131. http://www.fs.fed.us/rm/albuq/pubs/rmrs_gtr060.pdf. Retrieved 17 February 2012.


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