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Actogram analysis of free-flying migratory birds: new perspectives based on acceleration logging
Johan Bäckman1, Arne Andersson2, Lykke Pedersen3
1Department of Biology, Lund University, Ecology Building, 22362, Lund, Sweden. Johan.Backman@biol.lu.se.
Summary
Accelerometers provide detailed insights into bird migration, revealing flight patterns and energy expenditure. This technology enables new analyses of annual activity, enhancing our understanding of bird behavior and migration.
Area of Science:
- Ornithology
- Biologging Technology
- Animal Behavior
Background:
- Accelerometers are crucial biologging tools for studying bird flight, behavior, and energy expenditure.
- Previous studies focused on large birds, but recent successes include small songbirds throughout their annual cycle.
Purpose of the Study:
- To review the principles and potential of accelerometer use in bird migration research.
- To explore novel analyses and insights from annual accelerometer data, using the red-backed shrike as a case study.
Main Methods:
- Review of accelerometer principles and applications in avian biologging.
- Analysis of annual activity patterns using accelerometer-derived actograms for the red-backed shrike (Lanius collurio).
Main Results:
- Accelerometer data allow precise quantification of flights, durations, and timing of departures/landings.
- Revealed annual and diurnal migratory rhythms, including extended nocturnal flights.
- Demonstrated the ability to analyze exertion levels by tracking the balance between flight, rest, and activity intensity.
Conclusions:
- Accelerometer data offer a new dimension for studying bird migration, providing detailed annual activity patterns.
- Actograms derived from accelerometer data enable new insights into migratory behavior and life cycle energetics.
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