IUCN Red List Criteria
| Critically Endangered |
|
| Endangered |
A2bc+3bc+4bc |
| Vulnerable |
A2bc+3bc+4bc |
IUCN Red List history
| Year |
Category |
| 2012 |
Endangered |
| 2008 |
Endangered |
| 2006 |
Endangered |
| 2004 |
Least Concern |
| 2000 |
Lower Risk/Least Concern |
| 1994 |
Lower Risk/Least Concern |
| 1988 |
Lower Risk/Least Concern |
Species attributes
| Migratory status |
not a migrant |
Forest dependency |
Does not normally occur in forest |
| Land mass type |
|
Average mass |
- |
Distribution
| |
Estimate |
Data quality |
| Extent of Occurrence breeding/resident (km2) |
113,000 |
medium |
| Number of locations |
11-100 |
- |
| Fragmentation |
|
- |
Population & trend
| |
Estimate |
Data quality |
Derivation |
Year of estimate |
| No. of mature individuals |
|
medium |
Estimated |
2003 |
| Population trend |
Decreasing |
unknown |
|
- |
| Number of subpopulations |
2-100 |
- |
- |
- |
| Largest subpopulation |
1001-10000 |
- |
- |
- |
| Generation length (yrs) |
5.9 |
- |
- |
- |
|
Population justification: Rich et al (2003) |
|
Trend justification: A very rapid and on-going decline is estimated directly, based on repeated censuses (using the same methods) of the Central Valley population (which comprises the majority of the global population). Recent increases in the number of individuals counted are likely to be attributable to increased survey effort (L. Cook in litt. 2012). |
Country/Territory distribution
| Country/Territory |
Occurrence status |
Extinct |
Breeding |
Non-breeding |
Passage |
| Mexico |
Native |
No |
|
|
|
| USA |
Native |
No |
Yes |
|
|
Important Bird Areas where this species has triggered the IBA criteria
| Country/Territory |
IBA Name |
IBA link |
| USA |
San Pasqual Valley |
 |
| USA |
Santa Ana River Valley |
|
| USA |
Santa Clara River Valley |
|
Habitats & altitude
| Habitat (level 1) |
Habitat (level 2) |
Importance |
Occurrence |
| Artificial/Terrestrial |
Arable Land |
major |
resident |
| Wetlands (inland) |
Bogs, Marshes, Swamps, Fens, Peatlands |
major |
resident |
|
Altitude
|
0 - 1300 m
|
Occasional altitudinal limits
|
|
Threats & impact
| Threat (level 1) |
Threat (level 2) |
Impact and Stresses |
| Agriculture & Aquaculture |
Annual & perennial non-timber crops / Agro-industry farming |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Rapid Declines |
Medium Impact: |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Agriculture & Aquaculture |
Livestock farming & ranching / Agro-industry grazing, ranching or farming |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Rapid Declines |
Medium Impact: |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Biological resource use |
Fishing & harvesting aquatic resources / Persecution/control |
Timing |
Scope |
Severity |
Impact |
| Past, Unlikely to Return |
Majority (50-90%) |
Slow, Significant Decline |
Past Impact |
| Stresses |
|---|
| Species mortality |
|
| Invasive non-native/alien species/diseases |
Invasive non-native/alien species/diseases / Cattle Egret (Bubulcus ibis) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
|---|
| Species mortality |
|
| Invasive non-native/alien species/diseases |
Invasive non-native/alien species/diseases / Unspecified micro-organisms |
Timing |
Scope |
Severity |
Impact |
| Future |
Majority (50-90%) |
Slow, Significant Decline |
Low Impact: 4 |
| Stresses |
|---|
| Species mortality |
|
| Pollution |
Agricultural & forestry effluents / Type Unknown/Unrecorded |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
Recommended citation
BirdLife International (2013) Species factsheet: Agelaius tricolor. Downloaded from
http://www.birdlife.org on 26/05/2013.
Recommended citation for factsheets for more than one species: BirdLife International (2013) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 26/05/2013.
This information is based upon, and updates, the information published in BirdLife International (2000)
Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004)
Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.
To provide new information to update this factsheet or to correct any errors, please email BirdLife
To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.
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