Assessing the utility of two-and three-dimensional behavioural metrics in habitat usage models

Penelope Pascoe*, Mary Anne Lea, Rob H. Mattlin, Clive R. McMahon, Robert Harcourt, David Thompson, Leigh Torres, Kimberly Vinette-Herrin, Mark A. Hindell

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

For deep-diving, wide-ranging marine predators, foraging behaviour is often inferred from movement data. Various metrics are used to do this, and recently, metrics have been developed that consider both horizontal movement and vertical dive behaviour to better describe the use of the 3-dimensional environment these animals inhabit. However, the efficacy of these different metrics in predicting behavioural state is poorly understood. We used first passage time (2-dimensional) and first bottom time (3-dimensional) analyses on tracks derived from satelliterelayed data loggers to quantify and determine seal behavioural state while foraging at sea. Movement and dive data were collected from 38 southern elephant seals Mirounga leonina from Macquarie and Campbell Islands (in the Pacific sector of the Southern Ocean). Using a suite of environmental variables, linear mixed-effect models were derived for the 2 broad habitats visited by the seals: shelf and open ocean. The best-fitting models for each foraging metric in each habitat were then compared using a cross validation analysis to identify which foraging metric produced the best predictions of habitat use. In shelf habitats, the 3-dimensional foraging metric provided better predictions than the 2-dimensional metric, while the 2-dimensional foraging metric resulted in the best predictive capacity in the open ocean habitats. These findings highlight the importance of considering the appropriate foraging metrics when modelling foraging behaviour.

Original languageEnglish
Pages (from-to)181-192
Number of pages12
JournalMarine Ecology Progress Series
Volume562
DOIs
Publication statusPublished - 29 Dec 2016

Keywords

  • First passage time
  • Foraging
  • Habitat
  • Mirounga leonina

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