NT
White-capped Albatross Thalassarche steadi



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.
Robertson, C. J. R.; Nunn, G. B. 1998. Towards a new taxonomy for albatrosses. In: Robertson, G.; Gales, R. (ed.), Albatross biology and conservation, pp. 13-19. Surrey Beatty & Sons, Chipping Norton, Australia.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2018 Near Threatened A4de
2016 Near Threatened A4de
2013 Near Threatened A4de
2012 Near Threatened A2de+3de+4de
2010 Near Threatened A2d,e; A3d,e; A4d,e
2008 Near Threatened A4d,e
2007 Near Threatened
2004 Not Recognised
2000 Not Recognised
1994 Not Recognised
1988 Not Recognised
Species attributes

Migratory status full migrant Forest dependency does not normally occur in forest
Land-mass type shelf island
Average mass -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 114,000,000 km2 medium
Extent of Occurrence (non-breeding) 77,700,000 km2 medium
Area of Occupancy (breeding/resident) 540 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 203600 mature individuals good estimated 2012
Population trend decreasing poor suspected 1944-2010
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 20-29% - - -
Generation length 23.1 years - - -

Population justification: The annual breeding population varies considerably, and in recent years adjusted estimates have varied from lows of 73,838 breeding pairs in 2009 and 74,031 breeding pairs in 2013, to highs of 116,025 pairs in 2006 and 102,273 pairs in 2012 (Baker et al. 2014, 2015). The most recent count reported is of 101,798 breeding pairs in 2014 (Baker et al. 2015). This 2014 estimate equates to c.203,600 mature individuals, but this species is now considered to be a biennial breeder, meaning that the total population may in fact be much larger.

Trend justification: Pre-2006/2007 population estimates were not based on comparable methodologies to current census methods and therefore population trends cannot be calculated before this time. Count data over nine years show strong inter-annual fluctuations and trend analysis using regression splines showed no evidence for monotonic decline over the nine years (2006-2014) of the study (Baker et al. 2015). Further data are therefore required to confirm the population trend, which is retained, on a precautionary basis, as a moderately rapid on-going decline.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Angola extant uncertain
Argentina extant uncertain
Australia extant native yes yes
Brazil extant uncertain
Chile extant uncertain
Falkland Islands (Malvinas) extant uncertain
French Southern Territories extant uncertain
Heard Island and McDonald Islands (to Australia) extant uncertain
Madagascar extant uncertain
Mauritius extant uncertain
Mozambique extant uncertain
Namibia extant native yes
New Zealand extant native yes yes
Norfolk Island (to Australia) extant uncertain
Peru extant uncertain
RĂ©union (to France) extant uncertain
South Africa extant native yes
South Georgia & the South Sandwich Islands extant uncertain
St Helena (to UK) extant uncertain
Uruguay extant uncertain

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
New Zealand Adams Island
New Zealand Antipodes (offshore)
New Zealand Antipodes Islands
New Zealand Auckland Islands 1 (offshore)
New Zealand Auckland Islands 2 (near-shore)
New Zealand Disappointment Island
New Zealand Kaikoura (offshore)
New Zealand Main Auckland Island

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Subantarctic major breeding
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands major breeding
Marine Neritic Macroalgal/Kelp suitable breeding
Marine Neritic Macroalgal/Kelp suitable non-breeding
Marine Neritic Pelagic major breeding
Marine Neritic Pelagic major non-breeding
Marine Neritic Seagrass (Submerged) suitable breeding
Marine Neritic Seagrass (Submerged) suitable non-breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel suitable non-breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel suitable breeding
Marine Neritic Subtidal Rock and Rocky Reefs suitable non-breeding
Marine Neritic Subtidal Rock and Rocky Reefs suitable breeding
Marine Neritic Subtidal Sandy suitable non-breeding
Marine Neritic Subtidal Sandy suitable breeding
Marine Neritic Subtidal Sandy-Mud suitable non-breeding
Marine Neritic Subtidal Sandy-Mud suitable breeding
Marine Oceanic Epipelagic (0-200m) major breeding
Marine Oceanic Epipelagic (0-200m) major non-breeding
Marine Oceanic Mesopelagic (200-1000m) major breeding
Marine Oceanic Mesopelagic (200-1000m) major non-breeding
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Fishing & harvesting aquatic resources - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Felis catus Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Sus domesticus Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Reduced reproductive success

Recommended citation
BirdLife International (2024) Species factsheet: White-capped Albatross Thalassarche steadi. Downloaded from https://datazone.birdlife.org/species/factsheet/white-capped-albatross-thalassarche-steadi on 23/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 23/12/2024.