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Responses of ecological indicators to fishing pressure under environmental change: exploring non-linearity and thresholds

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Fu, C, Xu, Y, Gruss, A, Bundy, A, Shannon, L, Heymans, JJ, Halouani, G, Akoglu, E, Lynam, CP, Coll, M, Fulton, EA, Velez, L and Shin, Y-J 2020 , 'Responses of ecological indicators to fishing pressure under environmental change: exploring non-linearity and thresholds' , ICES Journal of Marine Science, vol. 77, no. 4 , pp. 1516-1531 , doi: 10.1093/icesjms/fsz182.

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Abstract

Marine ecosystems are influenced by multiple stressors in both linear and non-linear ways. Using generalized additive models (GAMs) fitted to outputs from a multi-ecosystem, multi-model simulation experiment, we investigated 14 major ecological indicators across ten marine ecosystems about their responses to fishing pressure under: (i) three different fishing strategies (focusing on low-, high-, or all-trophic-level taxa); and (ii) four different scenarios of directional or random primary productivity change, a proxy for environmental change. From this work, we draw four major conclusions: (i) responses of indicators to fishing mortality in shapes, directions, and thresholds depend on the fishing strategies considered; (ii) most of the indicators demonstrate decreasing trends with increasing fishing mortality, with a few exceptions depending on the type of fishing strategy; (iii) most of the indicators respond to fishing mortality in a linear way, particularly for community and biomass-based indicators; and (iv) occurrence of threshold for non-linear-mixed type (i.e. non-linear with inflection points) is not prevalent within the fishing mortality rates explored. The conclusions drawn from the present study provide a knowledge base in indicators’ dynamics under different fishing and primary productivity levels, thereby facilitating the application of ecosystem-based fisheries management worldwide.

Item Type: Article
Authors/Creators:Fu, C and Xu, Y and Gruss, A and Bundy, A and Shannon, L and Heymans, JJ and Halouani, G and Akoglu, E and Lynam, CP and Coll, M and Fulton, EA and Velez, L and Shin, Y-J
Keywords: ecosystem-based fisheries management, generalized additive model, marine ecosystem model, non-linear response, primary productivity
Journal or Publication Title: ICES Journal of Marine Science
Publisher: Academic Press Ltd Elsevier Science Ltd
ISSN: 1054-3139
DOI / ID Number: 10.1093/icesjms/fsz182
Copyright Information:

Copyright International Council for the Exploration of the Sea 2019. This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License (http://creativecommons.org/licenses/by/4.0/)

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