[en] Fisheries discards have become a source of concern for the perennation of marine resources. To reduce discards, the European Union adopted a Landing Obligation under the reform of its Common Fisheries Policy. However, food web consequences of reducing discards remain uncertain since their degree and pathway of reintegration are understudied. We used multi-marker DNA metabarcoding of gut contents and an ecological network approach to quantify marine fauna reliance on discarded fish and functional importance of discard consumers in coastal fishing grounds. We show that potential discard consumption is widespread across fish and invertebrates, but particularly important for decapods, which were also pinpointed as functionally important. Potential discard consumption may represent up to 66% of all interactions involving fish prey in the reconstructed network. We highlight that discard reliance may be more important than previously assessed in some fishing areas and support functionally important taxa. While reducing discarding remains a conservation priority, it is crucial to understand discards reintegration in marine food webs to anticipate changes in the context of an ecosystem approach to fisheries management.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Lejeune, Benjamin ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Écologie et de Conservation des Amphibiens (LECA) ; Centre d’Ecologie et des Sciences de la Conservation, UMR 7204 CNRS-MNHN-UPMC, Paris, France ; Ifremer, Unité de Sciences et Technologies Halieutiques, Laboratoire de Technologie et Biologie Halieutique, Lorient, France
Mouchet, Maud Aline; Centre d’Ecologie et des Sciences de la Conservation, UMR 7204 CNRS-MNHN-UPMC, Paris, France
Mehault, Sonia; Ifremer, Unité de Sciences et Technologies Halieutiques, Laboratoire de Technologie et Biologie Halieutique, Lorient, France
Kopp, Dorothée; Ifremer, Unité de Sciences et Technologies Halieutiques, Laboratoire de Technologie et Biologie Halieutique, Lorient, France
Language :
English
Title :
Gut content metabarcoding reveals potential importance of fisheries discards consumption in marine fauna
Publication date :
July 2022
Journal title :
Canadian Journal of Fisheries and Aquatic Sciences
FEAMP - Fonds Européen pour les Affaires Maritimes et la Pêche [BE] France Filière Pêche [FR]
Funding text :
This study was part of the DREAM project supported by the European Maritime and Fisheries Fund (EMFF) and France Filière Pêche. The authors thank the crew of the fishing vessel, as well as the three scientists Fabien Morandeau, Nicolas Goascoz and Julien Simon, for their help to conduct the onboard experiments. The authors are deeply indebted to the French Directorate of Marine Fisheries and Aquaculture (DPMA), to the team from the IFREMER French Fisheries Information System (SIH) for providing access to the OBSMER database, and to Loïc Baulier, who processed the data.
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