Field signs. Big Duck, larger cristate black. Weight about one kg. Back gray with a delicate cross pattern, sides and belly white. Eyes yellow beak and legs bluish-gray. Female dark brown with a white wide ring around the grounds beak. Well nyryaet, fly fast, takes off easily with water. The voice - loud and deep "Carr (Syroechkovsky, Rogacheva, 1980).  Distribution. Naselyaet mostly forest, the southern half of the zone tundra and the extreme northern taiga. There were nesting in the Taimyr under 72 ° 30 'N (Tugarinov, Buturlin, 1911). A Norilsk Lakes and the northern forest at the beginning of Pyasiny very usual, but in a clean tundra comes near and north of the origins Pury has not found (Krechmar, 1966). At Hantayskom Lake rare nesting duck (Syroechkovsky, 1961). To the south is marked by Turuhanska (Isakov, 1952), but nesting is not installed. The southern border traced the spread of bad. Perhaps the most peculiar black sea waters and forest-tundra bush tundra. Here she places of habitual (Rogacheva, 1988). Particularly happy selitsya on small lakes with zarosshimi shores of the forest and tundra, often side by side with singoy, turpanom and cristate black (Krechmar , 1966).
Phenology. The massive spring passage at Norilsk lakes is June 4-11, at the mouth of Dudypty - in mid-June. Embarking on reproduction in the second decade of June. Particularly happy to settle for smaller lakes with zarosshimi shores of the forest and tundra, often in proximity to singoy, Turpanom and cristate black (Krechmar, 1966). The young in Norilsk tundra output in the twentieth of July, in mid-September, they begin to climb on the wing. Otlet from Norilsk later - in late September - early October. Great flocks in the passage does not form (Syroechkovsky, Rogacheva, 1980). Reproduction. Jacks makes close to the water. Masonry - 6-10 major dirty-olive eggs (Syroechkovsky, Rogacheva, 1980). Meals mixed. Almost equally black consume animal and vegetable diet: molluscs, crustaceans, larval insects, small fish, roots, leaves and seeds of aquatic plants (Syroechkovsky, Rogacheva, 1980). Number. According to AS Martynov (1983), a zone of high population density species extends evenly from the mouth to the Yenisei River. Popigay on flat areas of extreme forest-tundra (perhaps an appropriate subzone bush tundra). To the north and south strength of the marine black insignificant. Nearly half of resource types (45%) are on the «extreme forest»; in the typical tundra concentrated 29%. A small percentage of birds in summer kochuet north of the clustered area. There have been meetings of black sea in the vicinity of village. Dixon. The number of species is stable and is only a cyclical change. On average in the 1978-1981 biennium. Autumn total strength of 530 thousand birds. References. |
