Classification of anomalous diffusion in animal movement data using power spectral analysis

Ohad Vilk, Erez Aghion, Ran Nathan, Sivan Toledo, Ralf Metzler*, Michael Assaf*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The field of movement ecology has seen a rapid increase in high-resolution data in recent years, leading to the development of numerous statistical and numerical methods to analyse relocation trajectories. Data are often collected at the level of the individual and for long periods that may encompass a range of behaviours. Here, we use the power spectral density (PSD) to characterise the random movement patterns of a black-winged kite (Elanus caeruleus) and a white stork (Ciconia ciconia). The tracks are first segmented and clustered into different behaviours (movement modes), and for each mode we measure the PSD and the ageing properties of the process. For the foraging kite we find 1/f noise, previously reported in ecological systems mainly in the context of population dynamics, but not for movement data. We further suggest plausible models for each of the behavioural modes by comparing both the measured PSD exponents and the distribution of the single-trajectory PSD to known theoretical results and simulations.

Original languageAmerican English
Article number334004
JournalJournal of Physics A: Mathematical and Theoretical
Volume55
Issue number33
DOIs
StatePublished - 19 Aug 2022

Bibliographical note

Publisher Copyright:
© 2022 The Author(s). Published by IOP Publishing Ltd.

Keywords

  • diffusion, anomalous diffusion
  • ecological movement data
  • power spectral analysis

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