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Data from: The structure of the annual migratory flight activity in a songbird

Sjöberg, Sissel1; Macías Torres, Pablo1; Andersson, Arne1; Bäckman, Johan1; Thorup, Kasper2; Tøttrup, Anders P.2; Alerstam, Thomas1

Research facility: Lund University
Published Sep 02, 2025 on Dryad. https://doi.org/10.5061/dryad.gqnk98szz

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Sep 02, 2025 version files 9.71 MB

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Abstract

Migratory songbirds have an internal circannual genetic program that controls the timing and extent of migratory flight activity, as demonstrated by experiments with birds held in cages. We used multisensor loggers to record the timing and duration of all migratory flights during the annual cycle of 15 free-living individuals of red-backed shrikes Lanius collurio. Annual actograms unexpectedly revealed that the nocturnal migratory flights of the shrikes were organized in a highly structured way with flights aggregated into segments that could be readily identified for all individuals, showing low variability and thus high consistency between individuals. These results suggest that the execution of migratory flights is under a high degree of control according to a rather detailed internal travelling plan for the annual migration cycle. Potentially, the control of migratory flight under natural conditions depends on at complex feed-back process where external cues associated with the geographic, temporal, and nutritional situation of the bird are required for the internal program to properly regulate the successive segmental flight steps of the migratory journey. This would mean that the internal/genetic program for control of bird migration is much more dynamic and complex than hereto assumed. The data published here is the raw data from the multisensor data loggers that are the basis of this study (Proceedings of the Royal Society B, doi:10.1098/rspb.2025.0958).