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Ecological inference using data from accelerometers needs careful protocols

Baptiste Garde, Rory Wilson Orcid Logo, Adam Fell, Nik Cole, Vikash Tatayah, Mark Holton Orcid Logo, Kayleigh Rose Orcid Logo, Richard Metcalfe Orcid Logo, Hermina Robotka, Martin Wikelski Orcid Logo, Fred Tremblay, Shannon Whelan Orcid Logo, Kyle H. Elliott, Emily Shepard Orcid Logo

Methods in Ecology and Evolution, Volume: 13, Issue: 4

Swansea University Authors: Baptiste Garde, Rory Wilson Orcid Logo, Adam Fell, Mark Holton Orcid Logo, Kayleigh Rose Orcid Logo, Richard Metcalfe Orcid Logo, Emily Shepard Orcid Logo

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Abstract

Accelerometers in animal-attached tags are powerful tools in behavioural ecology, they can be used to determine behaviour and provide proxies for movement-based energy expenditure. Researchers are collecting and archiving data across systems, seasons and device types. However, using data repositorie...

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Published in: Methods in Ecology and Evolution
ISSN: 2041-210X 2041-210X
Published: Wiley 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa59252
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Abstract: Accelerometers in animal-attached tags are powerful tools in behavioural ecology, they can be used to determine behaviour and provide proxies for movement-based energy expenditure. Researchers are collecting and archiving data across systems, seasons and device types. However, using data repositories to draw ecological inference requires a good understanding of the error introduced according to sensor type and position on the study animal and protocols for error assessment and minimization.Using laboratory trials, we examine the absolute accuracy of tri-axial accelerometers and determine how inaccuracies impact measurements of dynamic body acceleration (DBA), a proxy for energy expenditure, in human participants. We then examine how tag type and placement affect the acceleration signal in birds, using pigeons Columba livia flying in a wind tunnel, with tags mounted simultaneously in two positions, and back- and tail-mounted tags deployed on wild kittiwakes Rissa tridactyla. Finally, we present a case study where two generations of tag were deployed using different attachment procedures on red-tailed tropicbirds Phaethon rubricauda foraging in different seasons.Bench tests showed that individual acceleration axes required a two-level correction to eliminate measurement error. This resulted in DBA differences of up to 5% between calibrated and uncalibrated tags for humans walking at a range of speeds. Device position was associated with greater variation in DBA, with upper- and lower back-mounted tags varying by 9% in pigeons, and tail- and back-mounted tags varying by 13% in kittiwakes. The tropicbird study highlighted the difficulties of attributing changes in signal amplitude to a single factor when confounding influences tend to covary, as DBA varied by 25% between seasons.Accelerometer accuracy, tag placement and attachment critically affect the signal amplitude and thereby the ability of the system to detect biologically meaningful phenomena. We propose a simple method to calibrate accelerometers that can be executed under field conditions. This should be used prior to deployments and archived with resulting data. We also suggest a way that researchers can assess accuracy in previously collected data, and caution that variable tag placement and attachment can increase sensor noise and even generate trends that have no biological meaning.
Keywords: biologger; biotelemetry; DBA; Accelerometer; biologging; tag placement; accuracy; calibration; tagging protocol
College: College of Science
Funders: H2020 European Research Council. Grant Number: 715874 Horizon 2020 European Union European Research Council
Issue: 4