Tricolored Blackbird
Common
Name: Tricolored Blackbird (TRBL)
Scientific
Name:
Agelaius tricolor
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. 423 (Beedy and Hamilton 1999)
Distribution:
Breeds from nw and e
Oregon
south thru int
California
, and along the coast from c
California
south to nw
Baja
California
,
Mexico
; Winters from n
California
south throughout the breeding range and adjacent ag areas (AOU 1998)
Habitat
Associations:
Fresh-water marshes of cattails, tule, bulrushes, and sedges; in
mig and winter also open cultivated fields and pastures (AOU 1998).
Source(s)
of Research/monitoring Needs: California
PIF Plan (including the Grasslands and the Riparian sections); BNA No. 423
(Beedy and Hamilton 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)
- Second
priority monitoring action – Conduct new winter surveys (PIF
Monitoring Needs)
- Intensive
statewide survey to identify breeding colony sites (California PIF
plan)
- see
needs under "Wintering"
Habitat Needs/Ecology/Life History
- Use
& depletion of food resources near breeding colonies; measures of
extent and character of foraging habitats; habitat selection
mechanisms; and relative value of alternative foraging habitats (BNA)
- Breeding
ecology of males (degree of polygyny, participation of first-year
males, relationship of territoriality to breeding densities of males
and females) (BNA)
Effects of Management Practices
- Determine
benefits/ drawbacks of various agricultural regimes on birds
(including TRBL) (
California
)
- Identify
& implement research relevant to management of TRBLs (
California
)
- Effects
of land use characteristics on TRBL reproductive success (BNA)
Predation
- Individual
TRBL behavior and population response to predators (BNA)
Wintering
- Distribution
& abundance, resource use, and survival of wintering TRBL (
California
; BNA)
Demographics
- Long-term
studies to document annual adult & first-year survival, fidelity
to breeding sites (BNA)
- monitor
reproductive success at representative sample of TRBL colonies (
California
)
Genetics/Taxonomy/Systematics
- Taxonomic
status of southern
California
population of TRBL (BNA)
[Link
to References]
[Link
to PIF Bird Conservation Plans]
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