SPRING MIGRATION OF WATER BIRDS ON THE PUTORANA PLATEAU

Ecologo-geographical differentiation and dynamics of spring migration of water and semiaquatic birds of the Putorana Plateau are analyzed. Eight points were surveyed in the northern, southern, western and eastern parts of the region on the total area of 250 000 km², applying the method of route census. The water and semiaquatic avifauna of the Putorana Plateau during the spring migration period includes 68 species. The birds fly in north, east and west directions. They make stops at the river deltas that thaw out early. Bird population density at stops is from 15 to 227, on average (n = 8) 94 ind./1 km of coastline. The population of birds on lakes is always much smaller than on the adjacent river sections. The entire spring migration of water and semiaquatic birds on the Putorana Plateau takes place from May 19 to June 27 and lasts on average (n = 10) 23 days. The main passage runs from May 25 to June 17 and lasts on average (n = 8) 7 days. Spring migration is most intense in the west of the Putorana Plateau, where at least 20 000-30 000 individuals of water and semiaquatic birds fly through the surveyed points. There are 19 species among the dominants of water and semiaquatic habitats, including Eurasian Wigeon, Common Teal, Greytaild Tattler, Northern Pintail and Little Stint.