LC
Greater Crested Tern Thalasseus bergii



Taxonomy

Taxonomic note
Thalasseus bergii (del Hoyo and Collar 2014) was previously placed in the genus Sterna.

Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: #http://www.aerc.eu/DOCS/Bird_taxa_of _the_WP15.xls#.
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: #http://www.aerc.eu/DOCS/Bird_taxa_of _the_WP15.xls#.
Christidis, L. and Boles, W.E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Collingwood, Australia.
Christidis, L.; Boles, W. E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Collingwood, Australia.
Cramp, S. and Perrins, C.M. 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. Oxford University Press, Oxford.
Cramp, S.; Perrins, C. M. 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. 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. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.
Turbott, E. G. 1990. Checklist of the birds of New Zealand. Ornithological Society of New Zealand, Wellington.
Turbott, E.G. 1990. Checklist of the birds of New Zealand. Ornithological Society of New Zealand, Wellington.

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

Red List history
Year Category Criteria
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
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) 142,000,000 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals poor estimated 2009
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) 10.5 - - -

Population justification: The global population is estimated to number c.150,000-1,100,000 individuals (Wetlands International 2006), while national population estimates include: c.100-10,000 breeding pairs and c.50-1,000 individuals on migration in China; c.10,000-100,000 breeding pairs and c.1,000-10,000 individuals on migration in Taiwan and c.100-10,000 breeding pairs and c.50-1,000 individuals on migration in Japan (Brazil 2009).

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 Resident Breeding Non-breeding Passage
Australia N Extant Yes
Bahrain N Extant Yes Yes
Bangladesh N Extant
British Indian Ocean Territory N Extant
Brunei N Extant
Cambodia N Extant
China (mainland) N Extant
Cook Islands N Extant Yes
Djibouti N Extant Yes
Egypt N Extant
Eritrea N Extant
Fiji N Extant Yes
French Polynesia N Extant
Guam (to USA) N Extant Yes
India N Extant
Indonesia N Extant
Iran, Islamic Republic of N Extant Yes
Iraq N Extant Yes
Israel N Extant
Japan N Extant
Jordan V Extant
Kenya N Extant
Kiribati N Extant
Kuwait N Extant Yes
Madagascar N Extant Yes
Malaysia N Extant Yes
Maldives N Extant Yes
Marshall Islands N Extant Yes
Mauritius N Extant
Mayotte (to France) N Extant
Micronesia, Federated States of N Extant Yes
Mozambique N Extant
Myanmar N Extant
Namibia N Extant Yes
Nauru V Extant
New Caledonia (to France) N Extant Yes
New Zealand V Extant
North Korea V Extant
Northern Mariana Islands (to USA) N Extant Yes
Oman N Extant Yes Yes
Pakistan N Extant
Palau N Extant Yes
Papua New Guinea N Extant Yes
Philippines N Extant Yes
Qatar N Extant Yes Yes
Saudi Arabia N Extant Yes
Seychelles N Extant Yes
Singapore N Extant
Solomon Islands N Extant Yes
Somalia N Extant
South Africa N Extant Yes
Sri Lanka N Extant
Sudan N Extant Yes
Taiwan (China) N Extant Yes
Tanzania N Extant Yes
Thailand N Extant
Timor-Leste N Extant Yes
Tonga N Extant Yes
Tuvalu N Extant Yes
United Arab Emirates N Extant Yes
USA V Extant
Vanuatu N Extant Yes
Vietnam N Extant
Wallis and Futuna Islands (to France) N Extant
Yemen N Extant Yes Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Australia Bountiful Islands
Australia Lowendal Islands
Australia Michaelmas Cay
Australia Pearce, Urquhart and Hervey Islands (Sir Edward Pellew Group)
Australia Seagull Island (Tiwi Islands)
China (mainland) Beiji Islands
China (mainland) Jiushan Islands Nature Reserve
China (mainland) Taizhou Islands
China (mainland) Yushan Islands
Djibouti Les Sept Frères
India Baliapannium Islands
Iran, Islamic Republic of Bahu Kalat (Gandu) Protected Area
Japan Nishinoshima island
Japan Nishinoshima islet - Marine
Japan Senkaku islands
Madagascar Cape Anorontany Archipelago NPA
Madagascar Nosy Manitse Future SAPM Marine and surrounding wetlands
Malaysia Kinabatangan floodplain
Malaysia Pulau Layang-Layang
Namibia Cape Cross lagoon
Namibia Lüderitz Bay islands
Namibia Sandwich Harbour
Namibia Sperrgebiet
Namibia Walvis Bay
Oman Al Batinah coast
Oman Barr al Hikman
Oman Duqm
Oman Halaaniyaat Islands
Oman Khawr ad Dahariz
Oman Khawr Hassan
Oman Masirah island
Oman Ras al Hadd
Philippines Tubbataha Reef National Marine Park
Saudi Arabia Gulf coral islands
Seychelles Cosmoledo
Singapore Kranji-Mandai
Singapore Ubin-Khatib
South Africa Berg River Estuary
South Africa Dassen Island
South Africa Dyer Island Nature Reserve
South Africa False Bay Nature Reserve
South Africa Robben Island
South Africa West Coast National Park and Saldanha Bay islands
Sudan Suakin archipelago
Taiwan (China) Matsu (Mazu) Islands Tern Refuge
Taiwan (China) Northeastern Sea Islets
Taiwan (China) Southern Sea Islets
Tanzania Latham Island
Yemen Abdullah Gharib lagoons
Yemen Aden

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Aquatic & Marine Artificial/Aquatic - Salt Exploitation Sites suitable non-breeding
Artificial/Aquatic & Marine Artificial/Aquatic - Salt Exploitation Sites suitable breeding
Artificial/Aquatic & Marine Artificial/Aquatic - Wastewater Treatment Areas suitable breeding
Artificial/Aquatic & Marine Artificial/Aquatic - Wastewater Treatment Areas suitable non-breeding
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands major breeding
Marine Intertidal Sandy Shoreline and/or Beaches, Sand Bars, Spits, Etc major breeding
Marine Neritic Coral Reef - Back Slope suitable breeding
Marine Neritic Coral Reef - Foreslope (Outer Reef Slope) suitable breeding
Marine Neritic Coral Reef - Inter-Reef Rubble Substrate suitable breeding
Marine Neritic Coral Reef - Inter-Reef Soft Substrate suitable breeding
Marine Neritic Coral Reef - Lagoon suitable breeding
Marine Neritic Coral Reef - Outer Reef Channel suitable breeding
Marine Neritic Estuaries suitable breeding
Marine Neritic Estuaries suitable non-breeding
Marine Neritic Macroalgal/Kelp major non-breeding
Marine Neritic Macroalgal/Kelp major breeding
Marine Neritic Pelagic suitable breeding
Marine Neritic Pelagic suitable non-breeding
Marine Neritic Seagrass (Submerged) major non-breeding
Marine Neritic Seagrass (Submerged) major breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel major non-breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel major breeding
Marine Neritic Subtidal Rock and Rocky Reefs major breeding
Marine Neritic Subtidal Rock and Rocky Reefs major non-breeding
Marine Neritic Subtidal Sandy major breeding
Marine Neritic Subtidal Sandy major non-breeding
Marine Neritic Subtidal Sandy-Mud major non-breeding
Marine Neritic Subtidal Sandy-Mud major breeding
Altitude   Occasional altitudinal limits  

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food (human) Whole Eggs Wild Non-trivial Recent
Food - human - - - Non-trivial Recent
Pets Whole Adults and juveniles Wild International Non-trivial Recent
Pets/display animals, horticulture - - - International Non-trivial Recent

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