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Yellow-shouldered Blackbird Agelaius xanthomus

IUCN Red List Criteria

Critically Endangered  
Endangered B1ab(i,ii,iii,v) 
Vulnerable  

IUCN Red List history

Year Category
2012 Endangered
2008 Endangered
2004 Endangered
2000 Endangered
1996 Endangered
1994 Endangered
1988 Threatened

Species attributes

Migratory status not a migrant Forest dependency Low
Land mass type   Average mass 38.4 g

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 210 medium
Number of locations 2-5 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals poor Estimated 1998
Population trend Decreasing poor -
Number of subpopulations 2-100 - - -
Largest subpopulation 251-1000 - - -
Generation length (yrs) 6 - - -
Population justification: Jaramillo and Burke (1999).
Trend justification: The population is stable  (R. Miranda-Medina in litt. 2012).

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Puerto Rico (to USA) Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Puerto Rico (to USA) Bosque Estatal de Boquerón inlcuyendo Punta Melones y Pitahaya site factsheet
Puerto Rico (to USA) Guaniquilla and Boquerón site factsheet
Puerto Rico (to USA) Jobos Bay site factsheet
Puerto Rico (to USA) Mona and Monito site factsheet
Puerto Rico (to USA) Sierra Bermeja and Laguna Cartagena site factsheet
Puerto Rico (to USA) Suroeste site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land suitable non-breeding
Artificial/Terrestrial Pastureland suitable non-breeding
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level suitable breeding
Shrubland Subtropical/Tropical Dry suitable breeding
Altitude 0 - 0 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Scale Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Shiny Cowbird (Molothrus bonariensis) Black Rat (Rattus Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Species disturbance, Reduced reproductive success

Utilisation

Purpose Primary form used Life stage used Source Scale Level Timing
Pets Whole Adults and juveniles Wild International Non-trivial Recent

Recommended citation
BirdLife International (2014) Species factsheet: Agelaius xanthomus. Downloaded from http://www.birdlife.org on 29/11/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 29/11/2014.

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.

Key facts
Current IUCN Red List category Endangered
Family Icteridae (New World blackbirds)
Species name author (Sclater, 1862)
Population size mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 210 km2
Country endemic? Yes
Links to further information
- Summary information on this species