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

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

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LINEK, Nils, Paweł BRZĘK, Phillip GIENAPP, M. 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. 9(1), 63. eISSN 2051-3933. Available under: doi: 10.1186/s40462-021-00298-y

@article{Linek2021-12-20parti-56050, title={A partial migrant relies upon a range-wide cue set but uses population-specific weighting for migratory timing}, year={2021}, doi={10.1186/s40462-021-00298-y}, number={1}, volume={9}, journal={Movement Ecology}, author={Linek, Nils and Brzęk, Paweł and Gienapp, Phillip and O'Mara, M. Teague and Pokrovsky, Ivan and Schmidt, Andreas and Shipley, J. Ryan and Volkmer, Tamara and Wikelski, Martin and Partecke, Jesko}, note={Article Number: 63} }

Shipley, J. Ryan Brzęk, Paweł Pokrovsky, Ivan Attribution 4.0 International Schmidt, Andreas Linek, Nils Wikelski, Martin Gienapp, Phillip 2022-01-03T15:47:11Z Volkmer, Tamara Partecke, Jesko O'Mara, M. Teague O'Mara, M. Teague Wikelski, Martin Schmidt, Andreas 2022-01-03T15:47:11Z Linek, Nils Background<br />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.<br /><br />Methods<br />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.<br /><br />Results<br />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.<br /><br />Conclusions<br />Our data support the idea that migratory timing is controlled by general, species-wide mechanisms, but fine-tuned thresholds in response to local conditions. Shipley, J. Ryan A partial migrant relies upon a range-wide cue set but uses population-specific weighting for migratory timing Pokrovsky, Ivan Gienapp, Phillip Brzęk, Paweł 2021-12-20 Partecke, Jesko Volkmer, Tamara eng

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