Field signs. Slightly smaller chernozoboy diver, but the size of a large duck. At the throat kashtanovoe bright spot. From the other diver differs slightly grayish rather than black back. The head and neck gray side, on the back of the neck white strip. Belly white. Flight fast, direct, takes off, even with small bodies of water, almost directly vyskakivaya from the water. In this regard, often nest in very small ponds, sometimes 5 meters across. Flies, and all diver, heavily immersed in water, ideally nyryaet and can stay under water for up to two minutes. Migratory birds. Be careful. Voice - stonuschie, yell, like "uaa-uaa." Before take-off and in the air - loud cackle: "gag-ha-loon" (Syroechkovsky, Rogacheva, 1980). Distribution. Tsirkumpolyarno common type. Jacks to the north to about 79 ° N (Severnaya Zemlya, the polar desert zone) (Belikov, Randla, 1987), to the south to srednetaezhnoy subzone (in Yenisey to 61 ° 50 'N - Village. Komsa). Most typically for small reservoirs tundra zone (in the West Taimyr an average of 1-3 pairs of birds in 10 lakes) (Krechmar, 1966). Outside the tundra zone of rare or Unit (Rogacheva, 1988). Habitats. Gnezdovoy biotope - small, often swamped the lake, sometimes bezrybnye (Syroechkovsky, Rogacheva, 1980). Phenology. In Norilsk Lakes region arrives late: in the first decade of June, from education to scour the rivers. Gross passage - mid June (Krechmar, 1966). Hatching chicks - the end of July - early August. Old birds are kept with the young, yet they do not learn to fly, that is before the end of August - beginning of September. At the end of September departure ends (Syroechkovsky, Rogacheva, 1980).  Reproduction. The reproduction begin in 10-15 days after the spadaet water - that nest is not far from the lake. Nest - umyataya in moss fossa with scant lining of the grass, always at the edge of the water. Masonry from the end of June of two eggs dirty-olive color with dark brown spots (Syroechkovsky, Rogacheva, 1980).
Nutrition. Pitaetsya smallest fish (up to 15 cm length) and invertebrates. Like the other diver, ingested by the fish under the water (Syroechkovsky, Rogacheva, 1980). References. |
