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LC
Common White Tern Gygis alba

IUCN Red List history

Year Category
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

Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type   Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 1,800
Extent of Occurrence non-breeding (km2) 16,900
Number of locations -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals poor Estimated 2009
Population trend Stable -
Number of subpopulations - - -
Largest subpopulation - - -
Generation length (yrs) 15.3 - - -
Trend justification: The overall population trend is stable, although some populations have unknown trends (Wetlands International 2006).

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
American Samoa Native Extant       Yes
Australia Native Extant       Yes
Bangladesh Native Extant       Yes
Bermuda (to UK) Vagrant Extant     Yes  
Brazil Native Extant       Yes
British Indian Ocean Territory Native Extant Yes      
Chile Native Extant       Yes
China (mainland) Native Extant       Yes
Christmas Island (to Australia) Vagrant Extant   Yes    
Cocos (Keeling) Islands (to Australia) Native Extant Yes      
Colombia Native Extant       Yes
Comoros Native Extant       Yes
Cook Islands Native Extant       Yes
Costa Rica Native Extant       Yes
Fiji Native Extant       Yes
French Polynesia Native Extant       Yes
French Southern Territories Unknown Extant        
Guam (to USA) Native Extant Yes      
India Native Extant       Yes
Indonesia Native Extant       Yes
Japan Native Extant       Yes
Kiribati Native Extant       Yes
Madagascar Unknown Extant        
Maldives Native Extant       Yes
Marshall Islands Native Extant Yes      
Mauritius Native Extant Yes      
Mayotte (to France) Native Extant       Yes
Mexico Native Extant       Yes
Micronesia, Federated States of Native Extant Yes      
Nauru Native Extant       Yes
New Caledonia (to France) Native Extant       Yes
New Zealand Native Extant Yes      
Niue (to New Zealand) Native Extant       Yes
Norfolk Island (to Australia) Native Extant       Yes
Northern Mariana Islands (to USA) Native Extant       Yes
Palau Native Extant Yes      
Panama Vagrant Extant   Yes    
Papua New Guinea Native Extant       Yes
Philippines Unknown Extant        
Pitcairn Islands (to UK) Native Extant Yes      
Réunion (to France) Native Extant       Yes
Samoa Native Extant       Yes
Seychelles Native Extant Yes      
Solomon Islands Native Extant       Yes
St Helena (to UK) Native Extant       Yes
Timor-Leste Unknown Extant        
Tokelau (to New Zealand) Native Extant       Yes
Tonga Native Extant       Yes
Trinidad and Tobago Native Extant       Yes
Tuvalu Native Extant       Yes
United States Minor Outlying Islands (to USA) Native Extant Yes      
USA Native Extant       Yes
Vanuatu Native Extant       Yes
Vietnam Native Extant       Yes
Wallis and Futuna Islands (to France) Native Extant Yes      

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
American Samoa National Park of American Samoa - Tutuila site factsheet
American Samoa Swain's Atoll site factsheet
American Samoa Swain's Atoll Marine site factsheet
American Samoa Tutuila Marine site factsheet
American Samoa West Tutuila site factsheet
Brazil Trindade e Martim Vaz site factsheet
Fiji Nukubasaga & Nukupureti site factsheet
French Polynesia Anuanuraro site factsheet
French Polynesia Mohotani site factsheet
French Polynesia Morane site factsheet
French Polynesia Motu de l'ouest et du sud de Rangiroa site factsheet
French Polynesia Niau site factsheet
French Polynesia Reitoru site factsheet
Kiribati Millenium (Caroline) Island site factsheet
Kiribati Millenium (Caroline) Island Marine site factsheet
Mauritius Cargados Carajos shoals (Saint Brandon) site factsheet
Micronesia, Federated States of Pohnpei Marine site factsheet
Micronesia, Federated States of Yap Island site factsheet
Micronesia, Federated States of Yap Island Marine site factsheet
Palau Fana Island Marine site factsheet
Palau Fana Island, Sonsorol site factsheet
Pitcairn Islands (to UK) Ducie Island site factsheet
Pitcairn Islands (to UK) Henderson Island site factsheet
Seychelles Aride island site factsheet
Seychelles Cousin island site factsheet
Seychelles Cousine island site factsheet
Seychelles Frégate island site factsheet
Seychelles Marie Louise island site factsheet
Tokelau (to New Zealand) Atafu site factsheet
Tokelau (to New Zealand) Nukunonu site factsheet
USA Northwestern Hawaiian Islands site factsheet
Wallis and Futuna Islands (to France) Futuna site factsheet
Wallis and Futuna Islands (to France) Futuna Marine site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands suitable 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  

Recommended citation
BirdLife International (2014) Species factsheet: Gygis alba. Downloaded from http://www.birdlife.org on 23/09/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 23/09/2014.

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 Least Concern
Family Laridae (Gulls, Terns, Skimmers)
Species name author (Sparrman, 1786)
Population size mature individuals
Population trend Stable
Distribution size (breeding/resident) 1,800 km2
Country endemic? No
Links to further information
- Summary information on this species