Ecosystem effects of invertebrate fisheries

Eddy, Tyler D., Lotze, Heike K., Fulton, Elizabeth A., Coll, Marta, Ainsworth, Cameron H., de Araújo, Júlio Neves, Bulman, Catherine M., Bundy, Alida, Christensen, Villy, Field, John C., Gribble, Neil A., Hasan, Mejs, Mackinson, Steve, and Townsend, Howard (2017) Ecosystem effects of invertebrate fisheries. Fish and Fisheries, 18 (1). pp. 40-53.

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Abstract

Since the 1950s, invertebrate fisheries catches have rapidly expanded globally to more than 10 million tonnes annually, with twice as many target species, and are now significant contributors to global seafood provision, export, trade and local livelihoods. Invertebrates play important and diverse functional roles in marine ecosystems, yet the ecosystem effects of their exploitation are poorly understood. Using 12 ecosystem models distributed worldwide, we analysed the trade-offs of various invertebrate fisheries and their ecosystem effects as well as ecological indicators. Although less recognized for their contributions to marine food webs, our results show that the magnitude of trophic impacts of invertebrates on other species of commercial and conservation interest is comparable with those of forage fish. Generally, cephalopods showed the strongest ecosystem effects and were characterized by a strong top-down predatory role. Lobster, and to a lesser extent, crabs, shrimp and prawns, also showed strong ecosystem effects, but at lower trophic levels. Benthic invertebrates, including epifauna and infauna, also showed considerable ecosystem effects, but with strong bottom-up characteristics. In contrast, urchins, bivalves, and gastropods showed generally lower ecosystem effects in our simulations. Invertebrates also strongly contributed to benthic-pelagic coupling, with exploitation of benthic invertebrates impacting pelagic fishes and vice versa. Finally, on average, invertebrates produced maximum sustainable yield at lower levels of depletion (similar to 45%) than forage fish (similar to 65%), highlighting the need for management targets that avoid negative consequences for target species and marine ecosystems as a whole.

Item ID: 50749
Item Type: Article (Research - C1)
ISSN: 1467-2979
Keywords: ecological indicators, ecopath with ecosim, ecosystem-based fisheries management, functional roles, invertebrate exploitation, trophic impacts
Funders: Lenfest Ocean Program, European Commission (EC), Spanish National Program Ramon y Cajal, NSERC, Defra project M1228 ' Fizzyfish'
Projects and Grants: EC Marie Curie Career Integration Grant Fellowship PCIG0-GA-2011-303534
Date Deposited: 20 Sep 2017 11:36
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070402 Aquatic Ecosystem Studies and Stock Assessment @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830299 Fisheries- Wild Caught not elsewhere classified @ 50%
96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960507 Ecosystem Assessment and Management of Marine Environments @ 50%
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