Correction: Ecological and phylogenetic aspects of the spring diet of three palaearctic species of swans

Affiliations

• ¹ Department of Applied Ecology, St. Petersburg State University, Universitetskaya Emb. 7-9, St., Petersburg, 199034, Russia. skouzov@mail.ru.
• ² Department of Applied Ecology, St. Petersburg State University, Universitetskaya Emb. 7-9, St., Petersburg, 199034, Russia.
• ³ Zoological Institute RAS, Universitetskaya Emb. 1, St., Petersburg, 199034, Russia.
• ⁴ Department of Vertebrate Zoology, St. Petersburg State University, Universitetskaya Emb. 7-9, St., Petersburg, 199034, Russia.