Publikation:

A partial migrant relies upon a range-wide cue set but uses population-specific weighting for migratory timing

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Linek_2-1ljz9uxflnqi81.pdf
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2021

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Brzęk, Paweł
Gienapp, Phillip
Pokrovsky, Ivan
Shipley, J. Ryan
et al.

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Published

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Movement Ecology. BioMed Central. 2021, 9(1), 63. eISSN 2051-3933. Available under: doi: 10.1186/s40462-021-00298-y

Zusammenfassung

Background
Many birds species range over vast geographic regions and migrate seasonally between their breeding and overwintering sites. Deciding when to depart for migration is one of the most consequential life-history decisions an individual may make. However, it is still not fully understood which environmental cues are used to time the onset of migration and to what extent their relative importance differs across a range of migratory strategies. We focus on departure decisions of a songbird, the Eurasian blackbird Turdus merula, in which selected Russian and Polish populations are full migrants which travel relatively long-distances, whereas Finnish and German populations exhibit partial migration with shorter migration distances.

Methods
We used telemetry data from the four populations (610 individuals) to determine which environmental cues individuals from each population use to initiate their autumn migration.

Results
When departing, individuals in all populations selected nights with high atmospheric pressure and minimal cloud cover. Fully migratory populations departed earlier in autumn, at longer day length, at higher ambient temperatures, and during nights with higher relative atmospheric pressure and more supportive winds than partial migrants; however, they did not depart in higher synchrony. Thus, while all studied populations used the same environmental cues, they used population-specific and locally tuned thresholds to determine the day of departure.

Conclusions
Our data support the idea that migratory timing is controlled by general, species-wide mechanisms, but fine-tuned thresholds in response to local conditions.

Zusammenfassung in einer weiteren Sprache

Fachgebiet (DDC)
570 Biowissenschaften, Biologie

Schlagwörter

Songbird migration, Departure decision, Control mechanisms, Environmental cues

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ISO 690LINEK, Nils Benjamin, Paweł BRZĘK, Phillip GIENAPP, Michael Teague O'MARA, Ivan POKROVSKY, Andreas SCHMIDT, J. Ryan SHIPLEY, Tamara VOLKMER, Martin WIKELSKI, Jesko PARTECKE, 2021. A partial migrant relies upon a range-wide cue set but uses population-specific weighting for migratory timing. In: Movement Ecology. BioMed Central. 2021, 9(1), 63. eISSN 2051-3933. Available under: doi: 10.1186/s40462-021-00298-y
BibTex
@article{Linek2021-12-20parti-56050,
  year={2021},
  doi={10.1186/s40462-021-00298-y},
  title={A partial migrant relies upon a range-wide cue set but uses population-specific weighting for migratory timing},
  number={1},
  volume={9},
  journal={Movement Ecology},
  author={Linek, Nils Benjamin and Brzęk, Paweł and Gienapp, Phillip and O'Mara, Michael Teague and Pokrovsky, Ivan and Schmidt, Andreas and Shipley, J. Ryan and Volkmer, Tamara and Wikelski, Martin and Partecke, Jesko},
  note={Article Number: 63}
}
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