Gray Vireo
Common
Name: Gray Vireo (GRVI)
Scientific
Name:
Vireo
vicinior
Global/Continental
Conservation Status: NOT on IUCN 2004 Red List
National-level
Conservation Status:
U.S.
– Bird of Conservation Concern
Key
Reference(s):
BNA No. 447 (Barlow et al. 1999)
Distribution:
Breeds locally from s California (north to Inyo County), s Nevada,
s Utah, w and se Colorado, and nw and c New Mexico south to nw Baja
California, c and se Arizona, s New Mexico, w Texas (east to Kinney,
Colorado, and Kerr counties), and nw Coahuila (Sierra del Carmen).
Winters locally in c and s Baja California, sw Arizona (rarely),
Sonora (including Tiburón and San Esteban islands), and (rarely) w Texas
(Big Bend region) (AOU 1998).
Habitat
Associations:
Dry oak-juniper and pinyon-juniper woodlands, dry chaparral, and
thorn scrub; in migration and winter, also desert and arid scrub (AOU
1998).
Source(s)
of Research/monitoring Needs: New Mexico Bird
Conservation Plan; Colorado Bird Conservation Plan; Arizona Bird
Conservation Plan; Nevada Bird Conservation Plan; California Bird
Conservation Plan; Texas Avian Research Projects- TARP (Texas Partners in
Flight 2001); BNA No. 447 (Barlow et al. 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 – Conduct species-specific surveys (PIF Monitoring
Needs doc); (similar) Better monitoring of GRVI populations throughout
its breeding range (BNA)
- Second
priority monitoring action – Conduct new winter surveys (PIF
Monitoring Needs doc)
- High
priority candidate for rapid status assessment (PIF Monitoring Needs
doc); (similar) More information on GRVI Population Status/Trends
- Population status and trend information for GRVI in
New Mexico
(
New Mexico
); Need more information about population trends in most of its range
(BNA)
- Distribution
of GRVI Habitat
- Determine amount and location of mature pinyon-juniper woodlands in
Arizona
(
Arizona
); Survey historic sites in
California
for GRVI presence (
California
)
- More
information on distribution/abundance/natural history of GRVI
- Distribution and natural history of GRVI (Arizona); Distribution and
abundance of GRVI (TARP - Chihuahuan Desert & Mexican Mts);
Complete additional surveys & bird atlases to get more detailed
information on distribution & abundance of GRVI (California)
- see
needs in "Habitat Needs/Ecology"
Habitat
Needs/Ecology/Life History
- More
information on GRVI habitat needs - GRVI habitat requirements (Arizona); Determine natural fire
regime/interval in successful Gray Vireo breeding areas (Arizona);
Study habitat selection and population viability for GRVI (Nevada);
Habitat needs of GRVI (TARP - Chihuahuan Desert & Mexican Mts)
- More
information on GRVI Natural History - More information on aspects of breeding biology (BNA);
Information on vocalizations and role of female song (BNA)
Effects
of Management Practices
- Effects
of fire and grazing on GRVI habitat in
New Mexico
(
New Mexico
)
- see
needs in "Habitat Needs/Ecology"
Species
Interactions
- Testing
the effectiveness of using Pinyon Jay as an umbrella species for
managing pinyon juniper avian communities including GRVI (
New Mexico
)
Predation
- See
needs under “Nest Parasitism” and “Demographics”
Nest
Parasitism
- Effects
of cowbird parasitism on birds in pinyon-juniper habitats including
GRVI (
Colorado
;
Arizona
)
- Identify
conditions that lead to excessive parasitism, predation, and failure
in nesting of pinyon-juniper birds including GRVI (
Colorado
)
- see
needs under "Demographics”
Wintering
- Find
GRVI Wintering Grounds
- Locate the wintering grounds of birds breeding in e Colorado, e New
Mexico, w Texas and adjacent Mexico (BNA); Determine where California
populations of GRVI winter using genetic methods or banding
(California)
- Winter
Ecology
- Compare winter diets of birds in
Sonora
and sw
Arizona
to those in w
Texas
and c Mexico (BNA); In w
Texas
males predominate on winter territories; where are the females? (BNA)
Invasives/Exotics/Disease/Parasites/Contaminants
- Determine
effects of ecto- and endo-parasites on fitness and survival of GRVI
(BNA)
Demographics
- GRVI
Nesting Success
- Nesting success of GRVI (TARP - Edwards' Plateau); Study nest
success & factors that may limit reproduction, especially brood
parasitism and predation (
California
)
Genetics/Taxonomy/Systematics
- Assess
role of genetic divergence between eastern & western populations
(BNA)
[Link
to References]
[Link
to PIF Bird Conservation Plans]
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