Population dynamics of colonial bird species of the «Trekhozerka» hole (Minusinsk hollow)

The dynamics of the specific structure and the birdnumber of the «Trekhozerka» hole in Minusinskhollow from 1988 to 2013 is analyzed in the article. According to the authors’ data, during the studied period the decrease in the specific variety of the nesting colonial bird species against the number growth of the types Larus argentatus mongolicus Sushkin, 1925, by Larusichthyaetus Pallas, 1773, Ardeacinerea Linnaeus, 1758 is registered.