Virginia's Warbler
Common
Name:
Virginia
's Warbler (VIWA)
Scientific
Name:
Vermivora
virginiae
Global/Continental
Conservation Status: Not on IUCN 2004 Red List
National-level
Conservation Status:
Nothing other than coverage under the Migratory Bird Treaty Act
Key
Reference(s):
BNA No. 477 (Olson and Martin 1999)
Distribution:
Breeds from in montane areas in the Great Basin region in e
California (White Mountains, eastern slope of Sierras in Mono and Inyo
counties; Clark Mountain, New York Mountains), Nevada (except nw), se
Idaho, Utah, sw Wyoming, w Colorado, n New Mexico; and also in s
California (San Bernardino and San Gabriel mountains), c Wyoming, eastern
ranges of Rocky Mountains in Colorado and New Mexico, c and se Arizona, c
and s New Mexico, and w Texas (Guadelupe and, probably, Davis mountains).
Winters from s Nayarit and Guanajuato south to Morelos and c
Oaxaca
(west of the isthmus of Tehuantepec), casually north to s
California
. Accidental in
Rio Grande
Valley
of
Texas
(AOU 1998).
Habitat
Associations:
Brushy arid montane woodland, oak thickets, mountain mahogany
groves, coniferous scrub, and chaparral; in migration and winter, also in
arid scrub, open woodland, and second growth (AOU 1998).
Source(s)
of Research/monitoring Needs: Colorado Bird Conservation
Plan (including sections on Colorado Plateau, and
Southern Rocky Mountains); Nevada Bird Conservation Plan; New
Mexico Bird Conservation Plan; BNA No. 477 (Olson and Martin 1999); PIF
Monitoring Needs document (Partners in Flight Science Committee 2004)
PIF
Continental Plan Monitoring Needs Category: Mo2 (BBS trends have very
low precision)
RESEARCH/MONITORING NEEDS (source(s) of needs)
Monitoring
- Priority
monitoring action – Improve the Breeding Bird Survey (PIF Monitoring
Needs doc)
- Specific
VIWA population status & trend questions - Determine population status and trends
for VIWA, specific to mountain mahogany habitats in Nevada (Nevada);
Address the conflicting opinions on the population status of VIWA (we
need better estimates of population trends or overall health of
populations (BNA); Additional monitoring required on Montane Shrub
species in
New Mexico
including VIWA (
New Mexico
)
- Basic
information on VIWA breeding range is not yet complete (BNA)
- See
needs under “Effects of Human Development …”
Habitat
Needs/Ecology/Life History
- Determine
minimum shrub canopy cover (threshold level) needed to support viable
populations of VIWA (
Colorado
)
- Do
a comparison of VIWA reproductive success in the range of habitats it
uses (BNA)
Effects
of Management Practices
- Effects
of prescribed burning in mountain shrubland on priority species
including VIWA (
Colorado
)
Effects
of Human Development/Disturbance
- Identify
areas of concern where impacts from humans have a negative impact on
VIWA (
Colorado
)
Migration
- Information
on VIWA ecology during migration, as well as timing along route in
Mexico (BNA)
Wintering
- Identify
principal wintering areas for VIWA (
Colorado
)
- Information
on VIWA ecology in wintering range (BNA)
Demographics
- Conduct
demographic studies on VIWA (
Colorado
)
[Link
to References]
[Link
to PIF Bird Conservation Plans]
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