VU
White-headed Steamerduck Tachyeres leucocephalus



Taxonomy

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - C2a(ii)

Red List history
Year Category Criteria
2018 Vulnerable C2a(ii)
2016 Vulnerable C2a(ii)
2012 Vulnerable C2a(ii)
2010 Near Threatened C2a(ii)
2008 Near Threatened C2a(ii)
2006 Near Threatened
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Near Threatened
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Land-mass type - continent
Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 130,000 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 3400-3700 medium estimated 2011
Population trend Decreasing poor inferred -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 1 - - -
Largest subpopulations 100 - - -
Generation length (yrs) 7.8 - - -

Population justification: In 2003, S. Imberti (in litt. 2003) estimated that perhaps fewer than 5,000 individuals  remain. More recently, the total size of the breeding population has been calculated to lie between 3,428 and 3,673 adults (Agüero et al. 2011), and 1,899 juveniles were also counted, giving a total population of c.5,300-5,600 individuals, and 3,400-3,700 mature individuals.

Trend justification: The population is inferred to be experiencing a continuing decline owing to a decline in habitat quality, and probable decreases in survival and breeding success, as caused by human activities and other problematic species. The rate of decline has not been quantified.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Argentina N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Argentina Caleta Sara e Isla Moreno
Argentina Sistema Península de Valdés
Argentina Complejo Punta Tombo - Punta Atlas
Argentina Punta Gutierrez - Bahía Camarones
Argentina Norte del Golfo San Jorge
Argentina Punta Clara - Punta Tombo
Argentina Isla Cumbre - Punta Lobería
Argentina Islas Blancas
Argentina Bahía San Gregorio e islas
Argentina Bahías Arredondo, Melo e islas
Argentina Punta Médanos
Argentina Punta Tafor e islas
Argentina Caleta Malaspina
Argentina Isla Quintano

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands major resident
Marine Intertidal Rocky Shoreline major resident
Marine Intertidal Tidepools major resident
Marine Neritic Macroalgal/Kelp major resident
Marine Neritic Seagrass (Submerged) major resident
Marine Neritic Subtidal Loose Rock/pebble/gravel major resident
Marine Neritic Subtidal Rock and Rocky Reefs major resident
Marine Neritic Subtidal Sandy major resident
Marine Neritic Subtidal Sandy-Mud major resident
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Fishing & harvesting aquatic resources - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species disturbance
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Reduced reproductive success
Energy production & mining Oil & gas drilling Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species disturbance, Ecosystem degradation
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species disturbance
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Balanus glandula Timing Scope Severity Impact
Ongoing Majority (50-90%) Unknown Unknown
Stresses
Indirect ecosystem effects
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Carcinus maenas Timing Scope Severity Impact
Ongoing Majority (50-90%) Unknown Unknown
Stresses
Indirect ecosystem effects
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Larus dominicanus Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Undaria pinnatifida Timing Scope Severity Impact
Ongoing Majority (50-90%) Unknown Unknown
Stresses
Indirect ecosystem effects
Invasive and other problematic species, genes & diseases Problematic native species/diseases - Larus dominicanus Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
None
Invasive and other problematic species, genes & diseases Problematic native species/diseases - Unspecified species Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
None
Pollution Industrial & military effluents - Oil spills Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Reduced reproductive success, Species mortality

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food - human - - Non-trivial Recent

Recommended citation
BirdLife International (2020) Species factsheet: Tachyeres leucocephalus. Downloaded from http://www.birdlife.org on 27/05/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 27/05/2020.