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Scaling marine fish movement behavior from individuals to populations

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Griffiths, CA ORCID: 0000-0001-7203-0426, Patterson, TA, Blanchard, JL ORCID: 0000-0003-0532-4824, Righton, DA, Wright, SR, Pitchford, JW and Blackwell, PG 2018 , 'Scaling marine fish movement behavior from individuals to populations' , Ecology and Evolution, vol. 8, no. 14 , pp. 7031-7043 , doi: 10.1002/ece3.4223.

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Abstract

Understanding how, where, and when animals move is a central problem in marine ecology and conservation. Key to improving our knowledge about what drives animal movement is the rising deployment of telemetry devices on a range of free‐roaming species. An increasingly popular way of gaining meaningful inference from an animal's recorded movements is the application of hidden Markov models (HMMs), which allow for the identification of latent behavioral states in the movement paths of individuals. However, the use of HMMs to explore the population‐level consequences of movement is often limited by model complexity and insufficient sample sizes. Here, we introduce an alternative approach to current practices and provide evidence of how the inclusion of prior information in model structure can simplify the application of HMMs to multiple animal movement paths with two clear benefits: (a) consistent state allocation and (b) increases in effective sample size. To demonstrate the utility of our approach, we apply HMMs and adapted HMMs to over 100 multivariate movement paths consisting of conditionally dependent daily horizontal and vertical movements in two species of demersal fish: Atlantic cod (Gadus morhua; n = 46) and European plaice (Pleuronectes platessa; n = 61). We identify latent states corresponding to two main underlying behaviors: resident and migrating. As our analysis considers a relatively large sample size and states are allocated consistently, we use collective model output to investigate state‐dependent spatiotemporal trends at the individual and population levels. In particular, we show how both species shift their movement behaviors on a seasonal basis and demonstrate population space use patterns that are consistent with previous individual‐level studies. Tagging studies are increasingly being used to inform stock assessment models, spatial management strategies, and monitoring of marine fish populations. Our approach provides a promising way of adding value to tagging studies because inferences about movement behavior can be gained from a larger proportion of datasets, making tagging studies more relevant to management and more cost‐effective.

Item Type: Article
Authors/Creators:Griffiths, CA and Patterson, TA and Blanchard, JL and Righton, DA and Wright, SR and Pitchford, JW and Blackwell, PG
Keywords: tagging, movement, fisheries, fish behaviour, Atlantic cod, data storage tags, European plaice, hidden Markov modeling, movement behavior, population-level patterns, priors
Journal or Publication Title: Ecology and Evolution
Publisher: John Wiley & Sons Ltd.
ISSN: 2045-7758
DOI / ID Number: 10.1002/ece3.4223
Copyright Information:

© 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

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