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Global assessment of the fishing impacts on the Southern Benguela ecosystem using an {EcoTroph} modelling approach

TitleGlobal assessment of the fishing impacts on the Southern Benguela ecosystem using an {EcoTroph} modelling approach
Publication TypeJournal Article
Year of Publication2012
AuthorsGasche, L, Gascuel, D, Shannon, L, Shin, Y-J
JournalJournal of Marine Systems
Volume90
Pagination1–12
ISSN0924-7963
KeywordsEcosystem indicators, Fishing impact, Overfishing, Southern Benguela, Trophic modelling, {EcoTroph}
Abstract

`We show that the {EcoTroph} model based on trophic spectra is an efficient tool to build ecosystem diagnoses of the impact of fishing. Using the Southern Benguela case study as a pretext, we present the first thorough application of the model to a real ecosystem. We thus review the structure and functioning of {EcoTroph} and we introduce the user to the steps that should be followed, showing the various possibilities of the model while underlining the most critical points of the modelling process. We show that {EcoTroph} provides an overview of the current exploitation level and target factors at the ecosystem scale, using two distinct trophic spectra to quantify the fishing targets and the fishing impact per trophic level. Then, we simulate changes in the fishing mortality, facilitating differential responses of two groups of species within the Southern Benguela ecosystem to be distinguished. More generally, we highlight various trends in a number of indicators of the ecosystem's state when increasing fishing mortality and we show that this ecosystem is moderately exploited, although predatory species are at their {MSY}. Finally, trophic spectra of the fishing effort multipliers {EMSY} and E0.1 are proposed as tools for monitoring the ecosystem effects of fishing.

URLhttp://www.sciencedirect.com/science/article/pii/S0924796311001709
DOI10.1016/j.jmarsys.2011.07.012