Trophodynamic indicators for an ecosystem approach to fisheries

Cury, Philippe; Shannon, Lynne J.; Roux, Jean‐Paul; Daskalov, Georgi; Jarre, Astrid; Moloney, Coleen L.; Pauly, Daniel

doi:10.1016/j.icesjms.2004.12.006

Cited by 165 publications

(85 citation statements)

References 48 publications

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“…A suite of trophodynamic indicators was estimated for both the SB and the NB, and their usefulness in detecting the development of the fisheries and associated ecosystem changes was evaluated by Cury et al (2005), who also analyzed their trends since 1950. The trophic level of the catch as defined by Pauly et al (1998) is the mean of the trophic levels of each group caught by the fisheries weighted by their landed mass.…”

Section: Trophodynamic Indicatorsmentioning

confidence: 99%

Jellyfication of Marine Ecosystems as a Likely Consequence of Overfishing Small Pelagic Fishes: Lessons from the Benguela

Roux¹,

Lingen²,

Gibbons³

et al. 2013

BMS

123

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Changes in two contrasting ecosystems of the Benguela upwelling region, one dominated at mid-trophic level by jellyfishes (Namibia, northern Benguela ecosystem, where small pelagic fish abundance has been severely depleted) and one still dominated by small pelagic fishes (South Africa, southern Benguela) were compared in an effort to determine ecosystem trajectories under different exploitation regimes. The role of small pelagic fishes (clupeoids) was highlighted in the context of their importance in maintaining interactions in marine ecosystems. In particular, we examined trophic cascades and possible irreversible changes that promote the proliferation of jellyfishes in marine systems. We found that the presence of large populations of small pelagic fishes has a fundamental role in preserving beneficial trophic interactions in these marine ecosystems. The implications of trophic cascades, such as those observed in the northern Benguela, for ecosystem-based management were apparent. In addition, this comparison provides contrasting case studies to inform the development of management scenarios that avoid ecosystem shifts that affect predators and reduce the value of fisheries production.

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Section: Trophodynamic Indicatorsmentioning

confidence: 99%

Jellyfication of Marine Ecosystems as a Likely Consequence of Overfishing Small Pelagic Fishes: Lessons from the Benguela

Roux¹,

Lingen²,

Gibbons³

et al. 2013

BMS

123

View full text Add to dashboard Cite

show abstract

“…Therefore, a consensus has emerged in fishery science to complement the 'single species' approach with an ecosystem approach to fisheries (Walters et al 1997, Cury et al 2005. This modern approach explicitly considers direct and indirect ecological interactions, particularly trophic links between ecosystem components, and allows simulations of the impacts of different fishing activities at the level of whole species assemblages.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the combined effects of artisanal and recreational fisheries on a Mediterranean MPA ecosystem using a trophic model

Albouy¹,

Mouillot²,

Rocklin³

et al. 2010

Mar. Ecol. Prog. Ser.

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Marine protected areas (MPAs) have the potential to enhance the long-term sustainability of coastal resources, and the artisanal fisheries which depend on them. However, recreational fisheries, which are increasing their impacts on coastal resources worldwide, may reduce the benefits that MPAs provide to declining artisanal fisheries. Here we used the Bonifacio Straits Natural Reserve (BSNR) Corsica as a study case to simulate the combined effects on coastal resources of artisanal and recreational fishing efforts. The BSNR ecosystem was modelled using mass-balance modelling of trophic interactions. This model was compared to another built on a non-protected area from the same region. We aggregated fishing fleets into artisanal and recreational categories, and we simulated various combinations of fishing effort over a 20 yr dynamic simulation using Ecosim. We showed that fishing activities have an additional top-down effect on the food web and that they decrease the targeted group's biomass, such as piscivorous species. We found, for some trophic groups, non-trivial patterns of biomass variation through trophic cascades. Our trophic approach revealed that some groups may suffer a biomass decrease when MPAs are set or enforced, due to the combined effect of artisanal and recreational fisheries. Overall, our results illustrate the value of modelling to manage MPAs, as a complementary tool to surveys. Models provide the opportunity to anticipate the potential consequences, at the ecosystem level, of socio-political decisions that aim to sustain coastal resources while managing artisanal and recreational fisheries.

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“…An alternative method of prey evaluation therefore was required. Biological metrics and indices have been commonly and reliably employed to evaluate ecological data for research (Washington 1984;Krebs 1999;Abrantes et al 2014) and fishery management (Cury et al 2005;Jennings 2005;Samhouri et al 2009;Kaplan and Levin 2009). Therefore, the creation and application of an index was used as the basis for the determination of major prey in this study.…”

Section: Caveats and Considerationsmentioning

confidence: 99%

Diet composition and foraging ecology of U.S. Pacific Coast groundfishes with applications for fisheries management

2016

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Determining the prey composition and foraging habitats of U.S. Pacific Coast groundfishes are specified management directives that have not received much scientific attention. To address this knowledge gap, we conducted a meta-analysis of the feeding ecology of 18 commercially important species and their life stages during a recent review of Pacific Coast groundfish essential fish habitat. A Major Prey Index was developed to evaluate relative importance among 47 prey taxa. Based on this metric, unidentified teleosts, euphausiids, and brachyuran crabs were the most important prey groups. When 14 generalized prey categories were used, fishes represented the dominant taxon (mean % weight or volume = 32.3) followed by shrimps (11.5), crabs (10.0), and euphausiids (9.5). PERMANOVA results indicated that species-specific differences were the primary source of dietary variability among tested variables (life stage, functional group, taxonomic group). Pacific Coast groundfishes mainly were characterized as mesopredators with estimated trophic levels ranging from 3.4 to 4.2. Foraging habitats differed significantly among functional (benthic, demersal, pelagic) and taxonomic (elasmobranch, roundfish, rockfish, flatfish) groups. Using hierarchical agglomerative cluster analysis, we identified a significantly distinct trophic guild that consumes mainly polychaetes and hard-shelled molluscs (juvenile, juvenile-adult Dover Sole; juvenile-adult English Sole) and another that specializes on euphausiids (juvenile Pacific Hake; juvenile-adult Darkblotched Rockfish). Our findings filled substantial data gaps in the trophic ecology and habitatbased management of commercially important species and can be used to inform future reviews of Pacific Coast groundfish essential fish habitat.

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Trophodynamic indicators for an ecosystem approach to fisheries

Cited by 165 publications

References 48 publications

Jellyfication of Marine Ecosystems as a Likely Consequence of Overfishing Small Pelagic Fishes: Lessons from the Benguela

Jellyfication of Marine Ecosystems as a Likely Consequence of Overfishing Small Pelagic Fishes: Lessons from the Benguela

Simulation of the combined effects of artisanal and recreational fisheries on a Mediterranean MPA ecosystem using a trophic model

Diet composition and foraging ecology of U.S. Pacific Coast groundfishes with applications for fisheries management

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