comm. Three distinctive populations are all of current management concern: the range-restricted “Least” Bell’s Vireo of coastal chaparral in southern California, the “Arizona” Bell’s Vireo of desert waterways, and a more widespread Midwestern subspecies. Nevertheless, with the loss of their preferred habitats across the continent, the species has become scarce in many places where it was once … A third study was on the Santa Clara River, in Ventura and Los Angeles counties from 1991 to 1996. The least bell’s vireo (Vireo bellii pusillus) was formerly abundant in the riparian woodlands of California's Central Valley and low elevation riparian streams in southern California and northern Baja, Mexico [1]. Historically, the least Bell’s vireo ranged from Red Bluff, California, at the top of the Central Valley south to northwestern Baja California, and as far east as Owens Valley, Death Valley, and the Mojave River. Least Bell's vireos, Vireo bellii pusillus, are an endangered subspecies of the Bell's vireo. In the decade since listing, Least Bell's Vireo numbers have increased 6-fold, and the species is expanding into its historic range. Nesting vireos have recolonized the Santa Clara River (Ventura County) to the north, where 67 pairs nested in 1998 (J. Greaves, pers. Though plain in plumage, males sing so energetically and distinctively that overlooking them during the breeding season is difficult. In recent years, the Least Bell's Vireo has expanded both in territory and number. Vireo bellii Range This map depicts the range boundary, defined as the areas where the species is estimated to occur at a rate of 5% or more for at least one week within each season. The Bell's Vireo has a breeding range of around 291,000 square kilometers. (About 4.5 to 5.0 inches) They have short rounded wings and short, straight bills. Vireo bellii When it is glimpsed in low brushy thickets of the Midwest or Southwest, this bird looks totally nondescript. Two studies were made on the Santa Ynez River, Santa Barbara County, 1 from 1979 to 1983 (Greaves 1987) and 1 from 1987 to 1994. It was one of California's most abundant birds in the late 19th and early 20th centuries, but was reduced to just 300 pairs by 1986. the Historic Range of Least Bell’s Vireo] Doug McPherson, Environmental Protection Specialist, Southern California Area Office : 10:55 – 11:05 BREAK 11:05 - 11:15 U.S. Forest Service – [FS Riparian Conservation Programs in CA] Patti Krueger, TES Co-leader, Pacific SW Division : 11:15 – 11:25 DoD, USMC Camp Pendleton – Riparian Programmatic Consultation. When it is heard, however, it is easy to recognize, singing a jumbled clinking song, as if it had a mouthful of marbles. This geographically variable vireo is attracted to scrubby thickets everywhere it occurs. ), and the Mojave River (San Bernardino … It was one of California's most abundant birds in the late 19th and early 20th centuries, but was reduced to just 300 pairs by 1986. It winters in similar habitats in western Mexico south to El Salvador. They are only 11.5-12.5 centimeters long. Least Bell's Vireos are small birds. It winters in similar habitats in western Mexico south to El Salvador. Language Common name; Dutch: Bells Vireo: English, United States: Bell's Vireo: French: Viréo de Bell: Icelandic: Botnagræningi: Japanese: ベルモズモドキ The decline was driven by the separate and combined effects of habitat loss … This subspecies continues to decline throughout its range. However, one subspecies, the Least Bell's Vireo of California and Baja California, is listed as federally endangered, primarily from loss of riparian habitat and cowbird brood parasitism. near the northern limit of the subspecies’ range. In 1998, the population size was estimated at 2,000 pairs (L. Hays, USFWS, pers. This includes dense, low, brushy habitats in the central and southwestern United States south to central Mexico. The Bell's Vireo has a breeding range of around 291,000 square kilometers.
Least Bell’s Vireo Ø Small, grey songbird Ø Breeds in California and Northern Baja Ø Riparian habitat obligate Ø Primarily willow/cottonwood/sycamore Ø Mulefat understory Ø Uses adjacent uplands where native vegetation present Ø Tolerates a broad range of habitat and natural :low regime conditions Ø … comm.). There is a faint white eye ring. Least Bell's vireos migrate and spend the winter in southern Baja California. A tireless little bird of thickets and thorn scrub, the Bell’s Vireo nests from the Midwest to the Southwest and into northern Mexico. The least bell’s vireo (Vireo bellii pusillus) was formerly abundant in the riparian woodlands of California's Central Valley and low elevation riparian streams in southern California and northern Baja, Mexico [1]. Members of the subspecies are limited in their range, breeding only in southwestern California and northern Mexico. Its range was limited to eight counties, all south of Santa Barbara (Kus).
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