+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Abundance and productivity of warbling vireos across an elevational gradient in the Sierra Nevada



Abundance and productivity of warbling vireos across an elevational gradient in the Sierra Nevada



Condor 108(2): 315-325



Recent studies have shown that Warbling Vireos (Vireo gilvus) are declining in California and that these trends are due to low reproductive success. Brood parasitism by Brown-headed Cowbirds (Molothrus ater) has been implicated in the low productivity. I explored two hypotheses related to population dynamics of Warbling Vireos along an elevational gradient: (1) potential source populations exist at high elevations where cowbirds are rare, and (2) potential source populations occur in the center of the elevational distribution with less productive populations at upper and lower elevations. From 1985 through 2002 I studied the abundance and productivity of Warbling Vireos over an elevational gradient in the southern Sierra Nevada. Warbling Vireos were most abundant in mid elevation mixed conifer sites, less abundant in lower elevation ponderosa pine sites and upper elevation true fir sites and rare in upper elevation lodgepole pine sites. Likewise, daily survival rates of nests were highest at mid elevations ( appr. 1800 m) and gradually decreased at both higher and lower elevations. Compared to other populations studied in California, nest success in mixed conifer habitat was high (60%, n = 58). Although rates of brood parasitism were high enough to be of concern in low-elevation ponderosa pine forests, cowbird parasitism was not observed in mid- to upper-elevation forests. Warbling Vireos were most productive where they were most abundant. The hypothesis that potential source populations exist at upper elevations did not appear to hold at the upper bounds of the elevational distribution. The results of this study provide support for the hypothesis that potential source populations occur in the center of the elevational distribution, with less productive populations at both lower and higher elevations.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 037742181

Download citation: RISBibTeXText

DOI: 10.1650/0010-5422(2006)108[315:aapowv]2.0.co;2


Related references

Nesting Habitat of Warbling Vireos across an Elevational Gradient in the Southern Sierra Nevada. Journal of Field Ornithology 78(3): 229-239, 2007

Nesting habitat of Warbling Vireos across an elevational gradient in the southern Sierra Nevada. Journal of field ornithology 78(3): 229-239, 2007

Abundance and rates of brood parasitism by brown-headed cowbirds over an elevational gradient in the southern Sierra Nevada. Studies in Avian Biology. 18 May; 18: 97-103, 1999

Seasonal patterns of bridge use by bats along an elevational gradient in the Sierra Nevada of California. Bat Research News 42(4): 174-175, Winter, 2001

Thermoregulation in the lizard Psammodromus algirus along a 2200-m elevational gradient in Sierra Nevada (Spain). International Journal of Biometeorology 60(5): 687-697, 2016

Historic fire regimes along an elevational gradient on the West Slope of the Sierra Nevada, California. General technical report INT (320) 173-179, 1995

Abundance and productivity of birds over an elevational gradient. U S Forest Service General Technical Report PSW: 183: 121-132, 2002

Aspects of the population biology of sugar pine pinus lambertiana on an elevational gradient in the sierra nevada of central california usa. American Midland Naturalist 111(1): 126-137, 1984

Aspects of the Population Biology of Sugar Pine (Pinus lambertiana Dougl.) on an Elevational Gradient in the Sierra Nevada of Central California. American Midland Naturalist 111(1): 126-137, 1984

Warbling Vireo Reproductive Success and Nest-Site Characteristics in the Northern Sierra Nevada, California (Exito de anidamineto y caractersticas claves del lugar de anidamiento de Vireo gilvus en la parte norte de la Sierra Nevada, California). Journal of Field Ornithology 76(4): 383-389, 2005

Elevational movements of large frugivorous birds and temporal variation in abundance of fruits along an elevational gradient. Ornitologia Neotropical30: 433-445, 2004

Warbling vireo nesting ecology in the northern Sierra Nevada. Western Birds 35(1): 32-41, 2004

Warbling vireo reproductive success and nest-site characteristics in the northern Sierra Nevada, California. Journal of Field Ornithology ober; 76(4): 383-389, 2005

Neotectonics of the Sierra Nevada and the Sierra Nevada-Basin and Range transition, California, with field trip stop descriptions for the northeastern Sierra Nevada. Special Publication - California Department of Conservation, Division of Mines and Geology Pages 173-212, 2000

Soil development along an elevational transect in the western Sierra Nevada, California. Geoderma 78(3-4): 207-236, 1997