Synchronous timing of return to breeding sites in a long-distance migratory seabird with ocean-scale variation in migration schedules

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2024
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van Bemmelen, Rob S. A.
Moe, Børge
Schekkerman, Hans
Hansen, Sveinn Are
Humphreys, Elizabeth M.
Mäntylä, Elina
Hallgrimsson, Gunnar Thor
Gilg, Olivier
Tulp, Ingrid
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Movement Ecology. Springer Science and Business Media LLC. 2024, 12(1), 22. eISSN 2051-3933. Available under: doi: 10.1186/s40462-024-00459-9
Zusammenfassung

Background: Migratory birds generally have tightly scheduled annual cycles, in which delays can have carry-over effects on the timing of later events, ultimately impacting reproductive output. Whether temporal carry-over effects are more pronounced among migrations over larger distances, with tighter schedules, is a largely unexplored question. Methods: We tracked individual Arctic Skuas Stercorarius parasiticus , a long-distance migratory seabird, from eight breeding populations between Greenland and Siberia using light-level geolocators. We tested whether migration schedules among breeding populations differ as a function of their use of seven widely divergent wintering areas across the Atlantic Ocean, Mediterranean Sea and Indian Ocean. Results: Breeding at higher latitudes led not only to later reproduction and migration, but also faster spring migration and shorter time between return to the breeding area and clutch initiation. Wintering area was consistent within individuals among years; and more distant areas were associated with more time spent on migration and less time in the wintering areas. Skuas adjusted the period spent in the wintering area, regardless of migration distance, which buffered the variation in timing of autumn migration. Choice of wintering area had only minor effects on timing of return at the breeding area and timing of breeding and these effects were not consistent between breeding populations. Conclusion: The lack of a consistent effect of wintering area on timing of return between breeding areas indicates that individuals synchronize their arrival with others in their population despite extensive individual differences in migration strategies.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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Arctic Skua, Parasitic Jaeger, Stercorarius parasiticus, Migratory connectivity, Phenology, Annual cycle, Carry-over effects
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ISO 690VAN BEMMELEN, Rob S. A., Børge MOE, Hans SCHEKKERMAN, Sveinn Are HANSEN, Katherine SNELL, Elizabeth M. HUMPHREYS, Elina MÄNTYLÄ, Gunnar Thor HALLGRIMSSON, Olivier GILG, Ingrid TULP, 2024. Synchronous timing of return to breeding sites in a long-distance migratory seabird with ocean-scale variation in migration schedules. In: Movement Ecology. Springer Science and Business Media LLC. 2024, 12(1), 22. eISSN 2051-3933. Available under: doi: 10.1186/s40462-024-00459-9
BibTex
@article{vanBemmelen2024-03-22Synch-69802,
  year={2024},
  doi={10.1186/s40462-024-00459-9},
  title={Synchronous timing of return to breeding sites in a long-distance migratory seabird with ocean-scale variation in migration schedules},
  number={1},
  volume={12},
  journal={Movement Ecology},
  author={van Bemmelen, Rob S. A. and Moe, Børge and Schekkerman, Hans and Hansen, Sveinn Are and Snell, Katherine and Humphreys, Elizabeth M. and Mäntylä, Elina and Hallgrimsson, Gunnar Thor and Gilg, Olivier and Tulp, Ingrid},
  note={Article Number: 22}
}
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Migratory birds generally have tightly scheduled annual cycles, in which delays can have carry-over effects on the timing of later events, ultimately impacting reproductive output. Whether temporal carry-over effects are more pronounced among migrations over larger distances, with tighter schedules, is a largely unexplored question. 
Methods: 
We tracked individual Arctic Skuas Stercorarius parasiticus , a long-distance migratory seabird, from eight breeding populations between Greenland and Siberia using light-level geolocators. We tested whether migration schedules among breeding populations differ as a function of their use of seven widely divergent wintering areas across the Atlantic Ocean, Mediterranean Sea and Indian Ocean. 
Results: 
Breeding at higher latitudes led not only to later reproduction and migration, but also faster spring migration and shorter time between return to the breeding area and clutch initiation. Wintering area was consistent within individuals among years; and more distant areas were associated with more time spent on migration and less time in the wintering areas. Skuas adjusted the period spent in the wintering area, regardless of migration distance, which buffered the variation in timing of autumn migration. Choice of wintering area had only minor effects on timing of return at the breeding area and timing of breeding and these effects were not consistent between breeding populations. 
Conclusion: 
The lack of a consistent effect of wintering area on timing of return between breeding areas indicates that individuals synchronize their arrival with others in their population despite extensive individual differences in migration strategies.</dcterms:abstract>
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