Energy-based step selection analysis: modelling the energetic drivers of animal movement and habitat use

Natasha J. Klappstein*, Jonathan R. Potts, Théo Michelot, Luca Börger, Nicholas W. Pilfold, Mark A. Lewis, Andrew E. Derocher

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

1. The energetic gains from foraging and costs of movement are expected to be key drivers of animal decision-making, as their balance is a large determinant of body condition and survival. This fundamental perspective is often missing from habitat selection studies, which mainly describe correlations between space use and environmental features, rather than the mechanisms behind these correlations.


2. To address this gap, we present a novel parameterisation of step selection functions (SSFs), that we term the energy selection function (ESF). In this model, the likelihood of an animal selecting a movement step depends directly on the corresponding energetic gains and costs, and we can therefore assess how moving animals choose habitat based on energetic considerations.


3. The ESF retains the mathematical convenience and practicality of other SSFs and can be quickly fitted using standard software. In this article, we outline a workflow, from data gathering to statistical analysis, and use a case study of polar bears Ursus maritimus to demonstrate application of the model.


4. We explain how defining gains and costs at the scale of the movement step allows us to include information about resource distribution, landscape resistance and movement patterns. We further demonstrate this process with a case study of polar bears and show how the parameters can be interpreted in terms of selection for energetic gains and against energetic costs.


5. The ESF is a flexible framework that combines the energetic consequences of both movement and resource selection, thus incorporating a key mechanism into habitat selection analysis. Further, because it is based on familiar habitat selection models, the ESF is widely applicable to any study system where energetic gains and costs can be derived, and has immense potential for methodological extensions.
Original languageEnglish
Article number13687
Pages (from-to)946-957
Number of pages12
JournalJournal of Animal Ecology
Volume91
Issue number5
Early online date22 Mar 2022
DOIs
Publication statusPublished - 1 May 2022

Keywords

  • Animal movement
  • Energetics
  • Energy landscapes
  • Habitat selection
  • Movement ecology
  • Optimal foraging theory
  • Polar bear
  • Step selection functions

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