Data Zone
Taxonomic source(s)
Christidis, L. and Boles, W.E. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
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#.
Turbott, E.G. 1990. Checklist of the Birds of New Zealand. Ornithological Society of New Zealand, Wellington.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2018 | Least Concern | |
| 2016 | Least Concern | |
| 2012 | Least Concern | |
| 2009 | Least Concern | |
| 2008 | Least Concern | |
| 2004 | Least Concern | |
| 2000 | Lower Risk/Least Concern | |
| 1994 | Lower Risk/Least Concern | |
| 1988 | Lower Risk/Least Concern |
| Migratory status | not a migrant | Forest dependency | Does not normally occur in forest |
| Land mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 137,000,000 | |
| Extent of Occurrence non-breeding (km2) | 150,000,000 | |
| Number of locations | - | |
| Fragmentation | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | poor | estimated | 2006 | |
| Population trend | Stable | 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) | - | - | - | |
| Number of subpopulations | - | - | - | |
| Largest subpopulations | - | - | - | |
| Generation length (yrs) | 15.3 | - | - | - |
Population justification: Delany and Scott (2006) estimate the population at 150000-1100000 individuals.
Trend justification: The overall population trend is stable, although some populations have unknown trends (Delany and Scott 2006).
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| American Samoa | N | Extant | Yes | |||
| Australia | N | Extant | Yes | |||
| Bangladesh | N | Extant | Yes | |||
| Bermuda (to UK) | V | Extant | Yes | |||
| Brazil | N | Extant | Yes | |||
| British Indian Ocean Territory | N | Extant | Yes | |||
| Chile | N | Extant | Yes | |||
| China (mainland) | N | Extant | Yes | |||
| Christmas Island (to Australia) | V | Extant | Yes | |||
| Cocos (Keeling) Islands (to Australia) | N | Extant | Yes | |||
| Colombia | N | Extant | Yes | |||
| Comoros | N | Extant | Yes | |||
| Cook Islands | N | Extant | Yes | |||
| Costa Rica | N | Extant | Yes | |||
| Fiji | N | Extant | Yes | |||
| French Polynesia | N | Extant | Yes | |||
| French Southern Territories | U | Extant | ||||
| Guam (to USA) | N | Extant | Yes | |||
| India | N | Extant | Yes | |||
| Indonesia | N | Extant | Yes | |||
| Japan | N | Extant | Yes | |||
| Kiribati | N | Extant | Yes | |||
| Madagascar | U | Extant | ||||
| Maldives | N | Extant | Yes | |||
| Marshall Islands | N | Extant | Yes | |||
| Mauritius | N | Extant | Yes | |||
| Mayotte (to France) | N | Extant | Yes | |||
| Mexico | N | Extant | Yes | |||
| Micronesia, Federated States of | N | Extant | Yes | |||
| Nauru | N | Extant | Yes | |||
| New Caledonia (to France) | N | Extant | Yes | |||
| New Zealand | N | Extant | Yes | |||
| Niue (to New Zealand) | N | Extant | Yes | |||
| Norfolk Island (to Australia) | N | Extant | Yes | |||
| Northern Mariana Islands (to USA) | N | Extant | Yes | |||
| Palau | N | Extant | Yes | |||
| Panama | V | Extant | Yes | |||
| Papua New Guinea | N | Extant | Yes | |||
| Philippines | U | Extant | ||||
| Pitcairn Islands (to UK) | N | Extant | Yes | |||
| Réunion (to France) | N | Extant | Yes | |||
| Samoa | N | Extant | Yes | |||
| Seychelles | N | Extant | Yes | |||
| Solomon Islands | N | Extant | Yes | |||
| St Helena (to UK) | N | Extant | Yes | |||
| Timor-Leste | U | Extant | ||||
| Tokelau (to New Zealand) | N | Extant | Yes | |||
| Tonga | N | Extant | Yes | |||
| Trinidad and Tobago | N | Extant | Yes | |||
| Tuvalu | N | Extant | Yes | |||
| United States Minor Outlying Islands (to USA) | N | Extant | Yes | |||
| USA | N | Extant | Yes | |||
| Vanuatu | N | Extant | Yes | |||
| Vietnam | N | Extant | Yes | |||
| Wallis and Futuna Islands (to France) | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| American Samoa | National Park of American Samoa - Tutuila |
| American Samoa | Swain's Atoll |
| American Samoa | Swain's Atoll Marine |
| American Samoa | Tutuila Marine |
| American Samoa | West Tutuila |
| Brazil | Trindade e Martim Vaz |
| Fiji | Nukubasaga & Nukupureti |
| Fiji | Ringgold Islands |
| Fiji | Ringgold Islands Marine |
| French Polynesia | Anuanuraro |
| French Polynesia | Moruroa |
| French Polynesia | Moruroa Marine |
| French Polynesia | Motane (Mohotani) |
| French Polynesia | Motu de l'ouest et du sud de Rangiroa |
| French Polynesia | Niau |
| French Polynesia | Niau Marine |
| French Polynesia | Rangiroa Marine |
| French Polynesia | Reitoru |
| French Polynesia | Tikehau |
| French Polynesia | Tikehau Marine |
| Kiribati | Millenium (Caroline) Island |
| Kiribati | Millenium (Caroline) Island Marine |
| Kiribati | Teraina (Washington Island) |
| Kiribati | Teraina Marine |
| Mauritius | Cargados Carajos Shoals |
| Micronesia, Federated States of | Chuuk Atoll Marine |
| Micronesia, Federated States of | Kosrae Marine |
| Micronesia, Federated States of | Pohnpei Marine |
| Micronesia, Federated States of | Yap Island |
| Micronesia, Federated States of | Yap Island Marine |
| Norfolk Island (to Australia) | Norfolk Island / Phillip Island - Marine |
| Palau | Fana Island |
| Palau | Fana Island Marine |
| Pitcairn Islands (to UK) | Ducie Island |
| Pitcairn Islands (to UK) | Henderson Island |
| Seychelles | Aride Island Special Reserve |
| Seychelles | Cousin Island Special Reserve |
| Seychelles | Cousine island |
| Seychelles | Frégate island |
| Seychelles | Marie-Louise Island |
| St Helena (to UK) | Boatswainbird Island |
| St Helena (to UK) | Green Mountain |
| Tokelau (to New Zealand) | Atafu |
| Tokelau (to New Zealand) | Nukunonu |
| Tokelau (to New Zealand) | Tokelau Marine |
| USA | Northwestern Hawaiian Islands |
| Wallis and Futuna Islands (to France) | Futuna |
| Wallis and Futuna Islands (to France) | Futuna Marine |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Marine Coastal/Supratidal | Sea Cliffs and Rocky Offshore Islands | suitable | breeding |
| Marine Neritic | Coral Reef - Back Slope | major | breeding |
| Marine Neritic | Coral Reef - Foreslope (Outer Reef Slope) | major | breeding |
| Marine Neritic | Coral Reef - Inter-Reef Rubble Substrate | major | breeding |
| Marine Neritic | Coral Reef - Inter-Reef Soft Substrate | major | breeding |
| Marine Neritic | Coral Reef - Lagoon | major | breeding |
| Marine Neritic | Coral Reef - Outer Reef Channel | major | breeding |
| Marine Neritic | Macroalgal/Kelp | major | resident |
| Marine Neritic | Pelagic | 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 - 50 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Biological resource use | Hunting & trapping terrestrial animals - Intentional use (species is the target) | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
|||||||||
| 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 | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Named species | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
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Recommended citation
BirdLife International (2020) Species factsheet: Gygis alba. Downloaded from
http://www.birdlife.org on 21/02/2020.
Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 21/02/2020.
