Comparison of approaches for incorporating depredation on fisheries catches into Ecopath

Clavareau, L, Marzloff, MP, Trenkel, VM, Bulman, CM, Gourguet, S, Le Gallic, B, Hernvann, PY, Péron, C, Gasco, N, Faure, J and Tixier, Paul 2020, Comparison of approaches for incorporating depredation on fisheries catches into Ecopath, ICES journal of marine science, vol. 77, no. 7-8, pp. 3153-3167, doi: 10.1093/icesjms/fsaa219.

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Title Comparison of approaches for incorporating depredation on fisheries catches into Ecopath
Author(s) Clavareau, L
Marzloff, MP
Trenkel, VM
Bulman, CM
Gourguet, S
Le Gallic, B
Hernvann, PY
Péron, C
Gasco, N
Faure, J
Tixier, PaulORCID iD for Tixier, Paul
Journal name ICES journal of marine science
Volume number 77
Issue number 7-8
Start page 3153
End page 3167
Total pages 15
Publisher Oxford University Press
Place of publication Oxford, Eng.
Publication date 2020-12
ISSN 1054-3139
Keyword(s) Crozet
ecosystem model
marine predators
model structure
Summary Ecosystem-based approaches are increasingly used in fisheries management to account for the direct trophic impacts of fish population harvesting. However, fisheries can also indirectly alter ecosystem structure and functioning, for instance via the provision of new feeding opportunities to marine predators. For instance, marine depredation, where predators feed on fishery catches on fishing gear, is a behaviour developed by many marine species globally. This behaviour can modify both the ecological role of predators and fisheries performance. Yet, these ecosystem-wide effects of depredation are rarely considered holistically. In this study, we explored different ways of incorporating depredation into an Ecopath trophic model. We assessed, through a subantarctic case study, how three alternative model structures can account for depredation effects on fishery catches, predator and non-commercial prey populations, as well as target fish stocks. While none adequately addresses all facets of depredation, the alternative models can to some extent capture how depredation can lead to increased fishing pressure on stocks. As structural specificities of Ecopath prevented us from representing other depredation effects such as provisioning effects for predator populations, we conclude this study with a set of guidance to effectively capture the complex effects of depredation in marine ecosystems and fisheries models.
Language eng
DOI 10.1093/icesjms/fsaa219
Indigenous content off
HERDC Research category C1 Refereed article in a scholarly journal
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