Chlidonias


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Chlidonias

 

(in Russian, bolotnye krachki), a genus of birds of the gull family. The name includes three varieties: the black tern (C. nigra), white-winged tern (C. leucoptera),and whiskered tern (C. hybrida). Body length is 25–28 cm. Plumage is bluish black with white; the black tern has a white rump, the white-winged has white upper covert feathers, rudder feathers, and undertail, and the whiskered has white cheeks and throat. Widely distributed (excluding the north) in Europe, Asia, and North America, as well as in Africa and Australia, Chlidonias is a migratory bird. It nests in colonies in swampy meadows, swamps, and the shores of reservoirs overgrown with thick grassy vegetation. There are two to three eggs per laying; both parents sit on the eggs (18 days).

REFERENCE

Ptitsy Sovetskogo Soiuza, vol. 3. Edited by G. P. Dement’ev and N. A. Gladkhov. Moscow, 1951.
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Chlidonias niger "gaviotin negro" al igual que Phaetusa simplex "gaviotin pico largo", han sido registrados una sola vez en la playa arenosa marina (Pulido et al.
(4.) Colin O'Donnell and Joanne Hoare, "Meta-Analysis of Status and Trends in Breeding Populations of Black- Fronted Terns, (Chlidonias albostriatus) 1962-2008", New Zealand Journal of Ecology 35 (2011), 30-43.
Key words: Bird Conservation Region 9/Great Basin, Black Tern, Breeding Bird Survey, Chlidonias niger, Klamath Basin, land management, Oregon, population trends, volunteer monitoring, wetland
According to some authors (Hickey & Malecki 1997), the most suitable habitats for the Black Tern (Chlidonias niger) are those where 50% of the territory is covered with emergent vegetation.
TABLE 1--Monthly counts of black terns (Chlidonias niger) in Ojo de Liebre coastal lagoon and Guerrero Negro saltworks during 2006-2008 (within parentheses are the exact date of counts in A5, A6, A7, and Los Medanitos, and the inclusive dates during which the full monthly survey was completed).
Whiskered terns (Chlidonias hybrida) are found in Europe, Africa, Asia, and Australia.
This was followed by whiskered terns (Chlidonias hybrida), at 20 percent.
This bird looked only marginally bigger than the whiskered terns (Chlidonias hybrida) and behaved in flight very much like it as it joined the group of terns from time to time.
Slender-billed gulls (Larus genei), whiskered terns (Chlidonias hybrida) and gull-billed terns (Gelo-chelidon nilotica) breed in small colonies on dry mudbanks and islands.
Black Tern (Chlidonias niger).--Black Terns were summer residents in the marshes north of the Kankakee River; they bred commonly at some locations (Butler 1898).