Fisheries bycatch risk to marine megafauna is intensified in Lagrangian coherent structures

Kylie L Scales; Elliott L Hazen; Michael G Jacox; Frederic Castruccio; Sara M Maxwell; Rebecca L Lewison; Steven J Bograd

doi:10.1073/pnas.1801270115

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Fisheries bycatch risk to marine megafauna is intensified in Lagrangian coherent structures

Journal article

Peer reviewed

Fisheries bycatch risk to marine megafauna is intensified in Lagrangian coherent structures

Kylie L Scales, Elliott L Hazen, Michael G Jacox, Frederic Castruccio, Sara M Maxwell, Rebecca L Lewison and Steven J Bograd

Proceedings of the National Academy of Sciences of the United States of America, Vol.115(28), pp.7362-7367

2018

DOI: https://doi.org/10.1073/pnas.1801270115

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Abstract

ocean model

marine vertebrate

gillnet

Finite-Time Lyapunov Exponent

fronts

Incidental catch of nontarget species (bycatch) is a major barrier to ecological and economic sustainability in marine capture fisheries. Key to mitigating bycatch is an understanding of the habitat requirements of target and nontarget species and the influence of heterogeneity and variability in the dynamic marine environment. While patterns of overlap among marine capture fisheries and habitats of a taxonomically diverse range of marine vertebrates have been reported, a mechanistic understanding of the real-time physical drivers of bycatch events is lacking. Moving from describing patterns toward understanding processes, we apply a Lagrangian analysis to a high-resolution ocean model output to elucidate the fundamental mechanisms that drive fisheries interactions. We find that the likelihood of marine megafauna bycatch is intensified in attracting Lagrangian coherent structures associated with submesoscale and mesoscale filaments, fronts, and eddies. These results highlight how the real-time tracking of dynamic structures in the oceans can support fisheries sustainability and advance ecosystem-based management.

Details

Title: Fisheries bycatch risk to marine megafauna is intensified in Lagrangian coherent structures
Authors: Kylie L Scales (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Elliott L Hazen (Author) - National Oceanic and Atmospheric Administration Southwest Fisheries Science Center, United States
Michael G Jacox (Author) - National Oceanic and Atmospheric Administration Southwest Fisheries Science Center, United States
Frederic Castruccio (Author) - National Center for Atmospheric Research, United States
Sara M Maxwell (Author) - Old Dominion University, United States
Rebecca L Lewison (Author) - San Diego State University, United States
Steven J Bograd (Author) - National Center for Atmospheric Research, United States
Publication details: Proceedings of the National Academy of Sciences of the United States of America, Vol.115(28), pp.7362-7367
Publisher: National Academy of Sciences
Date published: 2018
DOI: 10.1073/pnas.1801270115
ISSN: 0027-8424
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99451224802621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Ecology

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