Ecology of Pine bunting (Emberiza leucocephala G., 1771) in the omsk region
The first Pine bunting's appearance in the Omsk Region is being observed late in March or early in April. The flight terms may vary, it depends on the weather conditions. The forming of the breeding population usually ends in 2 weeks after the bird's flight. For making a nest they need 3 or 4 days, but under the unfavorable conditions the time may be increased up to 5-6 days. The average weight of all components of a new nest is about 18 gr., the lining of the nest takes 12,9 per cent, the inside part of the nest comprises 43,2 %, the outside is about 43,9 % taken from the weight of the nest. The average weight of newly hatched chicks is about 2,5 gr (about 8% from the weight of an adult bird). The chicks are growing rapidly, in the third, in the fourth day, the weight is 6.3 (28% taken from adult weight), in six days it is nearly 18 (61%). The day before leaving the nest babie's weight is being decreased from 22 6 to 21, 2 gr. Autumn migrations in our region are in August. In the southern steppe their flight almost ceased by the end of August. But in September it continues along river valleys. The last meeting of Pine bunting oatmeal has been observed by us on September 21.