Spring migrations of the Whooper swan and Bewick's swan were studied on a farm-land near the town of Olonets during 1997 - 2017. Usually the majority of swans crossed the territory of the agricultural landscape in transit, and only a small portion of the birds stayed on it for feeding for 1 - 2 days. In 2017, swans formed a mass migration stopover on the fields, 340 to 1,328 individuals were counted on it for 11 days, whose majority (about 90%) were Bewick's swans. It was established that such a high concentration of swans in the fields was a result of a unfavorable ecological situation in the region at the beginning of their mass migration. The places of traditional migration stopovers in shallow waters of the Ladoga lake were closed by floating ice, and unusually cold weather of the second half of April and ice-covered water bodies in the Northern part of the migratory route hindered the migration of birds to their breeding grounds. In the current situation, the swans were forced to look for new places of feeding, and concentrated in the most favorable (for this purpose) grounds of the agricultural landscape.


Zimin V. B., Sazonov S. V., Lapshin N. V., Khokhlova T. Yu., Artemjev A. V., Annen-kov V. G., Yakovleva M. V. Ornitofauna Karelii [Avifauna of Karelia]. Petrozavodsk, Karel'skiy nauchniy centr RAN, 1993. 220 p. (in Russian).
Zimin V. B., Artemjev A. V., Lapshin N. V., Tulin A. P. Oloneckie vesennie skopleniya ptic. Obshchaya harakteristika. Gusi [The Olonets spring congregations of birds. General characteristics. Geese]. Moscow, Nauka Publ., 2007. 299 p. (in Russian).
Noskov G. A., Rymkevich T. A., Gaginskaya A. R., eds. Migration of birds of Northwest Russia. Non-passerines. Saint Petersburg, Professional Publ., 2016. 656 p. (in Russian).
Beekman J. H., Nolet B. A., Klaassen M. Skipping swans: differential use of migratory stopover sites in spring and autumn in relation to fuelling rates. Ardea, 2002, vol. 90, no. 3, pp. 437–460. 
Beekman J., Hall C., Laubek B., Rees E. International Bewick’s and Whooper Swan Census in northwest Europe. Swan News, 2015, no. 11, pp. 13–15.
Griffin L., Rees E., Hughes B. Satellite tracking Bewick’s Swan migration in relation to offshore and onshore wind farm sites. WWT Final Report to the Department of Energy and Climate Change. Slimbridge, WWT, 2016. 55 p.
Klaassen M., Beekman J. H., Kontiokorpi J., Mulder R. J. W., Nolet B. A. Migrating swans profit from favourable changes in wind conditions at low altitude. J. of Ornithology, 2004, vol. 145, iss. 2, pp. 142–151.
Luigujõe L., Kuresoo A., Rattiste K. Population status of the Bewick’s Swan (Cygnus columbianus bewickii) and protection proposals in Estonia. Hirundo, 2013, Vol. 26, no. 2, pp. 53–79.
Nolet B. A., Andreev V. A., Clausen P., Poot M. J. M., Wessel E. G. J. Significance of the White Sea as a stopover for Bewick's Swans Cygnus columbianus bewickii in spring. Ibis, 2001, vol. 143, iss. 1, pp. 63–71.
Nuijten R. J. M., Kölzsch A., van Gils J. A., Hoye B. J., Oosterbeek K., de Vries P. P., Klaassen M., Nolet B. A. The exception to the rule: retreating ice front makes Bewick’s swans Cygnus columbianus bewickii migrate slower in spring than in autumn. J. of Avian Biology, 2014, vol. 45, iss. 2, pp. 113–122.
Rees E. C., Beekman J. H. Northwest European Bewick's Swan: a population in decline. British Birds, 2010, vol. 103, pp. 640–650.

стр. 127
Short text (in English): 
Full text (in Russian):