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Migration patterns and individual variation of Long-tailed Duck (Clangula hyemalis) from the Russian Arcticтезисы доклада
- Авторы: Pollet I., Vardeh S., Loshchagina J., Glazov P., Kondratyev A., Sokolov A., Sokolov V., Masello J., Karwinkel T., Eichhorn G., Bellebaum J., Kruckenberg H., Quillfeldt P.
- Сборник: 19th edition of the Goose Specialist Group Meeting Leeuwarden, The Netherlands 28 January – 31 January 2020
- Тезисы
- Год издания: 2020
- Место издания: The Netherlands
- Первая страница: 18
- Последняя страница: 19
- Аннотация: The Long-tailed Duck (Clangula hyemalis) population wintering in the Baltic Sea has declined by 65% in the last 15 years, for reasons not yet entirely understood. One possible reason for this apparent decline could be a northern shift in wintering range of a portion of the population due to increased availability of ice-free waters in the Arctic. However, it is unclear whether individual Long-tailed Ducks have the plasticity to adapt their wintering range. We deployed and recovered light level loggers on female Long-tailed Ducks at three field sites in their Russian Arctic breeding area over a period including two annual cycles, from 2017 to 2019. We obtained 89 migration tracks from 63 females. Most fall staging locations were situated around the Novaya Zemlya archipelago. The vast majority of females (93.6%) migrated to the Baltic Sea, while the remaining migrated to the White Sea and the Barents Sea. Individual variability among years was very low and did not appear to be climate dependent. Spring staging occurred in the White Sea and the Chosha Bay. The observed decline of Long-tailed Ducks wintering in the Baltic Sea is not an effect of a shift of wintering range from a large portion of the population. Therefore, reasons for this decline still require our attention. Our limited temporal study offers no sign of a longitudinal or latitudinal shift in wintering range.
- Добавил в систему: Глазов Петр Михайлович