email a friend
printable version
VU
White-headed Steamerduck Tachyeres leucocephalus

IUCN Red List Criteria

Critically Endangered  
Endangered  
Vulnerable C2a(ii) 

IUCN Red List history

Year Category
2012 Vulnerable
2010 Near Threatened
2008 Near Threatened
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 continent
Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 28,200 medium
Number of locations -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 3400-3700 medium Estimated 2011
Population trend Decreasing poor -
Number of subpopulations 1 - - -
Largest subpopulation 3400-3700 - - -
Generation length (yrs) 7.8 - - -
Population justification: In 2003, S. Imberti (in litt. 2003) estimated that perhaps fewer than 5,000 remain. More recently, the total size of the breeding population has been calculated to be 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 Breeding Non-breeding Passage Resident
Argentina Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Argentina Complejo Punta Tombo - Punta Atlas site factsheet
Argentina Norte del Golfo San Jorge site factsheet
Argentina Punta Gutierrez - Bahía Camarones site factsheet
Argentina Sistema Península de Valdés site factsheet

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 0 - 0 m 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 Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation, Species mortality
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 / Acorn barnacle (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 / Asian kelp (Undaria pinnatifida) 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 / Green crab (Carcinus maenus) 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 Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Reduced reproductive success
Pollution Industrial & military effluents / Oil spills Timing Scope Severity Impact
Future Majority (50-90%) Very Rapid Declines Medium Impact: 6
Stresses
Ecosystem degradation, Species mortality

Utilisation

Purpose Primary form used Life stage used Source Scale Level Timing
Food (human) Whole Adults and juveniles Wild Subsistence, National Non-trivial Recent
Food (human) Whole Eggs Wild Subsistence, National Non-trivial Recent

Recommended citation
BirdLife International (2014) Species factsheet: Tachyeres leucocephalus. Downloaded from http://www.birdlife.org on 22/10/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/10/2014.

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 Vulnerable
Family Anatidae (Ducks, Geese, Swans)
Species name author Humphrey & Thompson, 1981
Population size 3400-3700 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 28,200 km2
Country endemic? Yes
Links to further information
- Summary information on this species