Actogram analysis of free-flying migratory birds: new perspectives based on acceleration logging

Johan Bäckman, Arne Andersson, Lykke Pedersen, Sissel Sjöberg, Anders P Tøttrup, Thomas Alerstam

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The use of accelerometers has become an important part of biologging techniques for large-sized birds with accelerometer data providing information about flight mode, wing-beat pattern, behaviour and energy expenditure. Such data show that birds using much energy-saving soaring/gliding flight like frigatebirds and swifts can stay airborne without landing for several months. Successful accelerometer studies have recently been conducted also for free-flying small songbirds during their entire annual cycle. Here we review the principles and possibilities for accelerometer studies in bird migration. We use the first annual actograms (for red-backed shrike Lanius collurio) to explore new analyses and insights that become possible with accelerometer data. Actogram data allow precise estimates of numbers of flights, flight durations as well as departure/landing times during the annual cycle. Annual and diurnal rhythms of migratory flights, as well as prolonged nocturnal flights across desert barriers are illustrated. The shifting balance between flight, rest and different intensities of activity throughout the year as revealed by actogram data can be used to analyse exertion levels during different phases of the life cycle. Accelerometer recording of the annual activity patterns of individual birds will open up a new dimension in bird migration research.

    Original languageEnglish
    Pages (from-to)543-564
    JournalJournal of Comparative Physiology A
    Volume203
    Issue number6-7
    Early online date2017 Mar 25
    DOIs
    Publication statusPublished - 2017 Jul

    Subject classification (UKÄ)

    • Evolutionary Biology
    • Zoology

    Free keywords

    • Accelerometer
    • Activity
    • Annual cycle
    • Bird migration
    • Flight pattern

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