Yermokhin M. V. RussiaSaratovSaratov State University, 33 Astrakhanskaya Str., Saratov 410012, Russiaecoton@rambler.ru Author's articles Ecological peculiarities of the nesting and reproduction of Haematopus ostralegus longipes Buturlin, 1910 (Haematopodidae, Charadriiformes) in the course of the Medveditsa river (Saratov region)