Ornithologist by heart 🦅🦜🦆🐦⬛🦩🦉💚
PostDoc at Uni Oldenburg, Germany
studying bird migration 🌍🔭🪽🐦
Thiemo Karwinkel
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Conclusions: The Baltic Sea represents the most important wintering area. Spring & autumn areas include the Barents & White Sea. Climate change will render these habitats more exposed to human impacts⛴️. Threats that now operate in the Baltic may thus spread to the higher latitude staging areas.
Thiemo Karwinkel
After breeding and moulting at freshwater lakes, ducks went out to sea around Kolguev Island and to marine waters ranging from the White Sea to Novaya Zemlya Archipelago for 33 ± 10 days.
6 year anniversary of the first Long-tailed duck (clangula hyemalis)🦆 light-level-geolocator tracking paper "Year-round spatiotemporal distribution pattern of a threatened sea duck species breeding on Kolguev Island, south-eastern Barents Sea" doi.org/10.1186/s128...
some results in the threat🧵⤵️
Here a summary on which kind of water-type, i.e. habitat, they spend these stages. Note that the Baltic Sea is brackish water and that the breeding stage includes the moult.
The Long tailed duck had a rapid population decline in its wintering range in the Baltic, so more data was needed on potential causes. The dataset was based on 19 recaught female long-tailed ducks from Kolguev, an Island in the European Russian part of the Barents Sea, north of the Arctic Circle.
After a rapid spring migration in mid-May, the birds spent 23 ± 3 days at sea in coastal areas between the White Sea and Kolguev Island, before returning to their freshwater breeding habitats in June.
Also read our follow up study with multi-year and multi-site data, including a repeatibility analysis of the life stages: "Individual Variation in Migration and Wintering Patterns of Long-Tailed Ducks Clangula hyemalis From a Population in Decline" 🦆 doi.org/10.1002/ece3...
After a rapid autumn migration, 18 of 19 birds spent their winter in the Baltic Sea and one bird in the White Sea, where they stayed for 212 ± 3 days. There, they used areas known to host long-tailed ducks, but areas differed among individuals.
