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Appendix. Estimate of Sooty Tern population worldwide.

LocationNumber of pairs(1)
Gulf of Mexico, Caribbean, total230,000–400,000
Anguilla, Dog Is.2,000 (R)
Sombrero Is.300–400 (R)
Antigua? (O)
Aruba200–400? (O)
Bahamas, 20+ cays, total4,000–8,000 (O)
Turks and Caicos? (O)
Walker's CayBreeds in unknown numbers (O)
British Virgin Is., total100 (R)
Carval RockA few (R)
Fallen JerusalemA few (R)
Round RockA few (R)
Colombia, Roncador Cay? (O)
Serrana and Serranilla Bank? (O)
Cuba, north cays40,000–60,000 (O)
south cays? (O)
Dominica1,000? (O)
Dominican Republic, north isles1,000+ (O)
Beata Is.50,000? (O)
French Guyana? (O)
GrenadaSeveral sites (O)
Grenadines? (O)
Guadeloupe4,000–6,000 (O)
Haiti? (O)
Honduras, Swann Is.1,000? (O)
Jamaica, Pedro Cays–2 sitesExtirpated (O)
Pedro Cays, Southwest Cay1,000–2,000 (R)
Morant Cays70,000–90,000 (R)
Martinique? (O)
Mexico, Caribbean coast cays100? (O)
Gulf coast cays? (O)
Clipperton1,000s (O)
Arrecife Alacrán? (O)
Puerto Rico, Culebra Cays25,000–35,000 (R)
Mona Is.300–400 (R)
Monito Is.Extirpated (R)
Desecheo Is.Extirpated (R)
Cordillera CaysExtirpated (R)
St. Bartholomew's? (O)
St. Eustacius? (O)
St. Kitts50–100 (O)
St. Lucia? (O)
St. Martin? (O)
Tobago, islets of north coast? (O)
Little Tobago? (O)
Smith Is.? (O)
Trinidad2,500 (O)
U.S., Corpus Christi, TXExtirpated (R)
Dry Tortugas, FL25,000–40,000 (R)
Chandeleur Is., LABreeds in unknown numbers (R)
U S. Virgin Is., Saba Is.30,000–40,000 (R)
Flat Cay50–200 (R)
Frenchcap Cay50–200 (R)
Turtledove Cay50–200 (R)
Venezuela, Aves Is.10,000? (O)
Los Hermanos Is.Large colony? (O)
La Orchila5,000? (O)
Los Roques ArchipelagoSmall colony (O)
Pacific Ocean, Hawaiian Archipelago, total1,000,000
French Frigate Shoals50,000–100,000 (R)
Gardner Pinnacles500 (O)
Kure Atoll6,000–8,000 (O)
Laysan I.100,000–200,000 (O)
Lisianski I.100,000–250,000 (O)
Midway Atoll45,000 (R)
Necker I.15,000–25,000 (O)
Nihoa I.15,000–35,000 (O)
Pearl and Hermes Reef20,000–40,000 (O)
Manana I.100,000 (O)
Moku ManuBreeds in unknown numbers (R)
Johnston Atoll80,000–100,000 (R)
Remainder of Pacific Ocean10,000,000–14,000,000 (O)
Atlantic Ocean islands1,000,000 (O)
Indian Ocean4,500,000 (Mainly R)
Total worldwide18,000,000–23,000,000 breeding pairs