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

Citation

Pascoe, P and Lea, MA and Mattlin, RH and McMahon, CR and Harcourt, R and Thompson, D and Torres, L and Vinette-Herrin, K and Hindell, MA, Assessing the utility of two- and three-dimensional behavioural metrics in habitat usage models, Marine Ecology - Progress Series, 562 pp. 181-192. ISSN 0171-8630 (2016) [Refereed Article]


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Copyright Statement

Copyright 2016 Inter-Research

DOI: doi:10.3354/meps11947

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 satellite-relayed 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.

Item Details

Item Type:Refereed Article
Keywords:foraging, habitat, first passage time, Mirounga leonina
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Wildlife and Habitat Management
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Antarctic and Sub-Antarctic Environments
Author:Pascoe, P (Ms Penelope Pascoe)
Author:Lea, MA (Associate Professor Mary-Anne Lea)
Author:McMahon, CR (Dr Clive McMahon)
Author:Hindell, MA (Professor Mark Hindell)
ID Code:114523
Year Published:2016
Deposited By:Centre for Ecology and Biodiversity
Deposited On:2017-02-17
Last Modified:2017-11-08
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