CR
Tristan Albatross Diomedea dabbenena



Taxonomy

Taxonomic source(s)
Brooke, M. de L. 2004. Albatrosses and Petrels Across the World. Oxford University Press, Oxford.
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
A4ade A4ade; B2ab(v) A4ade; B2ab(v); C1+2a(ii); D2

Red List history
Year Category Criteria
2016 Critically Endangered A4ade
2015 Critically Endangered A4ade
2013 Critically Endangered A4ade
2012 Critically Endangered A4ade
2010 Critically Endangered A4a,d,e
2009 Critically Endangered A4a,d,e
2008 Critically Endangered
2007 Endangered
2005 Endangered
2004 Endangered
2003 Endangered
2000 Endangered
1994 Not Recognised
1988 Not Recognised
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 54,900,000 medium
Extent of Occurrence non-breeding (km2) 14,100,000 medium
Extent of Occurrence breeding/resident (km2) 80 medium
Number of locations 1 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 3400-4800 medium estimated 2010
Population trend Decreasing medium estimated -
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) 80-100 - - -
Number of subpopulations 2 - - -
Largest subpopulations 100 - - -
Generation length (yrs) 28.7 - - -

Population justification:

Breeding populations are essentially restricted to Gough Island, with 2-3 pairs nesting intermittently on Inaccessible Island (McClelland et al. 2016). The annual breeding population is currently estimated to be 1,250-1,750 pairs annually (Royal Society for the Protection of Birds and University of Cape Town unpubl. data), equivalent to a total population of 5200-7300 individuals for this biennially breeding species (RSPB and UCT unpubl. data). This roughly equates to 3,400-4,800 mature individuals.

Trend justification: Recent counts suggest that the population on Gough has decreased by 28% over 46 years, and at 3-5% annually between 2000 and 2016 (Cuthbert et al. 2014, RSPB and UCT unpubl. data), which is in line with population modelling predicting annual rates of decline of 2.9-5.3% (Ryan et al. 2001, Wanless et al. 2009). More recent population modelling, conducted over three generations since 1980, suggests a decline equivalent to a 96% reduction in population size over three generations, since declines began (BirdLife International unpubl. data). The rate of on-going decline is therefore placed here in the band 80-100% over three generations (86 years).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Angola N Extant Yes
Argentina N Extant Yes
Brazil N Extant Yes
Namibia N Extant Yes
South Africa N Extant Yes
St Helena (to UK) N Extant Yes
Uruguay N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
High Seas Atlantic, Southeast 15 - Marine
High Seas Atlantic, Southeast 16 - Marine
St Helena (to UK) Gough Island
St Helena (to UK) Inaccessible Island
Uruguay Atlantic Ocean and Rio de la Plata mouth

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
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 breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel suitable non-breeding
Marine Neritic Subtidal Rock and Rocky Reefs suitable breeding
Marine Neritic Subtidal Rock and Rocky Reefs suitable non-breeding
Marine Neritic Subtidal Sandy suitable breeding
Marine Neritic Subtidal Sandy suitable non-breeding
Marine Neritic Subtidal Sandy-Mud suitable breeding
Marine Neritic Subtidal Sandy-Mud suitable non-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
Shrubland Temperate major breeding
Altitude 400 - 700 m 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%) Very Rapid Declines High Impact: 8
Stresses
Species mortality
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Rapid Declines Past Impact
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species - Mus musculus Timing Scope Severity Impact
Ongoing Whole (>90%) Rapid Declines High Impact: 8
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species - Sus domesticus Timing Scope Severity Impact
Past, Likely to Return Minority (<50%) Rapid Declines Past Impact
Stresses
Species mortality

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

Recommended citation
BirdLife International (2017) Species factsheet: Diomedea dabbenena. Downloaded from http://www.birdlife.org on 14/12/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 14/12/2017.