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 Land-mass type - shelf island
Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 114,000,000 medium
Extent of Occurrence non-breeding (km2) 77,700,000 medium
Extent of Occurrence breeding/resident (km2) 540 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 203600 good estimated 2012
Population trend Decreasing poor suspected -
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) 20-29 - - -
Number of subpopulations - - -
Largest subpopulations - - -
Generation length (yrs) 23.1 - - -

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 Occurrence status Presence Resident Breeding Non-breeding Passage
Angola U Extant
Argentina U Extant
Australia N Extant Yes Yes
Brazil U Extant
Chile U Extant
Falkland Islands (Malvinas) U Extant
French Southern Territories U Extant
Heard Island and McDonald Islands (to Australia) U Extant
Madagascar U Extant
Mauritius U Extant
Mozambique U Extant
Namibia N Extant Yes
New Zealand N Extant Yes Yes
Norfolk Island (to Australia) U Extant
Peru U Extant
Réunion (to France) U Extant
South Africa N Extant Yes
South Georgia & the South Sandwich Islands U Extant
St Helena (to UK) U Extant
Uruguay U Extant

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 Canterbury (offshore)
New Zealand Cook Strait
New Zealand Disappointment Island
New Zealand East Coast South Island (offshore)
New Zealand Kaikoura (offshore)
New Zealand Main Auckland Island
New Zealand Rakiura (offshore)
New Zealand Southern South Island (offshore)

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 (2019) Species factsheet: Thalassarche steadi. Downloaded from http://www.birdlife.org on 15/12/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 15/12/2019.