Hermit Warbler
Common
Name: Hermit Warbler (HEWA)
Scientific
Name:
Dendroica
occidentalis
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. 303 (Pearson 1997)
Distribution:
Breeds from w Washington south through the coast ranges and
Cascades (mostly western slopes) to n California, (Marin County), and
south in interior through the Sierra Nevada Mountains (to Kern County),
including extreme w-c Nevada; also small populations in Santa Cruz
Mountains of c California and in the San Gabriel and San Bernardino
mountains of s California. Winters
locally in coastal California (mainly from Point Reyes south to Santa
Barbara County; casually north to w Oregon and south to San Diego County),
and from Sinaloa and Durango south through the highlands of Mexico and
Central America (except Belize) to n-c Nicaragua.
Casual in interior
California
, s
Arizona
, and s
Texas
; accidental in
Missouri
and
Nova Scotia
(AOU 1998).
Habitat
Associations:
Coniferous forest, usually cool and moist, especially where
Douglas-fir present; in migration, a variety of wooded habitats; in
winter, primarily montane forest and pine-oak association (AOU 1998).
Source(s)
of Research/monitoring Needs: Oregon/Washington Bird
Conservation Plan (in
Westside
Coniferous
Forest
section); BNA No. 303 (Pearson 1997); PIF Monitoring Needs document
(Partners in Flight Science Committee 2004)
PIF
Continental Plan Monitoring Needs Category: ** (Long-term population
trend monitoring considered adequate, but some issues (e.g., bias) may not
be accounted for)
RESEARCH/MONITORING NEEDS (source(s) of needs)
Monitoring
- Priority
monitoring action – NOTE: Breeding
Bird Survey (BBS) provides acceptable data at the continental level (PIF
Monitoring Needs doc)
- Second
priority monitoring action – Improve the BBS (PIF Monitoring Needs
doc)
Habitat
Needs/Ecology/Life History
- Determine
suitability of various forest types for HEWA (reproductive success and
habitat requirements) - Determine the necessary forest patch size for successful HEWA
nesting to occur (Oregon/Washington); Study the reproductive success
and habitat relationships of HEWA (Oregon/Washington); Determine the
habitat affinities and reproductive success of several coniferous
forests bird species including HEWA (Oregon/Washington)
- Information
needed on HEWA breeding phenology (BNA)
- see
needs under "Demographics"
Effects
of Management Practices
- Effects
of Silvicultural Practices - Determine if age or forest structure affects
HEWA reproductive success (Oregon/Washington); Determine if riparian
management zones provide suitable habitat to support HEWA
(Oregon/Washington); Determine the threshold levels of green-tree
retention in harvest units necessary for reproducing birds including
HEWA (Oregon/Washington)
Species
Interactions
- Studies
of behavioral, ecological, and molecular
aspects of hybridization and secondary contact with a formerly
separate species (Townsend's Warbler) (BNA)
- see
needs under "Wintering"
Migration
- Information
on migration routes and stopover sites for HEWA and other species that
breed in the Pacific Northwest (BNA)
Wintering
- Information
on HEWA winter habitat requirements, interaction with other species,
relationships between its habitat and its demographic patterns (BNA)
Demographics
- Studies
of reproductive success and the demographic makeup of HEWA populations
in different habitat types (BNA)
- see
needs under "Wintering"
Genetics/Taxonomy/Systematics
- Studies
of song similarity among HEWA, Townsend’s Warbler, and
Black-throated Gray Warblers (BNA)
[Link
to References]
[Link
to PIF Bird Conservation Plans]
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