Regional peculiarities of community-wide trophic cascades in strongly degraded Black Sea food web

Oğuz, Temel; Salihoğlu, Barıș; Moncheva, Snejana; Abaza, Valeria

doi:10.1093/plankt/fbs002

Cited by 15 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Managers should be provided with evidence-based information showing the need to sustain sufficient prey fish in the ecosystem in order to support the dynamics of charismatic (i.e., predatory) fish species of their particular marine ecosystem considering indirect trophic impacts of fisheries within the food web (Akoglu et al, 2014 for the Black Sea and Ulanowicz and Puccia, 1990 for theoretic background). Otherwise, an ecosystem-wide collapse as previously experienced in the Black Sea (Oguz et al, 2012) is inevitable. Our proposed management criteria will allow the recovery of these fish species of the Black Sea, i.e., bluefish, bonito, and mackerel, in addition to ensuring the sustainable utilization of other fish stocks in the long-term.…”

Section: Discussionmentioning

confidence: 97%

Evolution of Future Black Sea Fish Stocks under Changing Environmental and Climatic Conditions

et al. 2017

View full text Add to dashboard Cite

Here we present a case study toward producing quantitative scientific advice on the application of the EU Common Fisheries Policy (CFP) in the Black Sea. We provide estimates of fishing mortality rates at levels which will lead to rebuilding and maintaining stocks above biomass levels that could produce maximum sustainable yield (MSY) under the IPCC RCP4.5 future climate scenario together with the business as usual (BAU) river discharge scenario. In this study, we have implemented a coupled, basin-scale circulation-biogeochemical model and used its output to feed a food web model to test near-future changes that may be observed in the Black Sea ecosystem under the influence of contemporary fisheries exploitation conditions. In order to test model response to changes in climate and related drivers, the future climate scenario (2015-2020) simulation was compared to the present day (2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014) simulation. Likewise, to test the sensitivity of the higher trophic level food web model to changes in fishing pressure, a future estimate of fishing pressure was projected based on its respective contemporary value and applied to each fish stock. Using these models, fishing mortality rates that could produce the maximum sustainable yield (F MSY ) in future years 2015-2020 and ensure the long-term recovery of the predatory fish stocks of the Black Sea are predicted. Future projections suggest that all fish stock will decrease in all the regions of the Black Sea except for sprat. Anchovy is expected to show the highest decrease in biomass. Analyses on F MSY estimates show that a significant reduction in fisheries exploitation is required for the sustainable management of the Black Sea ecosystems and the related services. This study, for the first time, presents future stock size, F MSY , and MSY estimates for the Black Sea for 11 fish species. F MSY values are generally lower than estimates of the scientific, technical, and economic committee for fisheries (STECF), mainly because of the explicit food web interactions that the modeling system allows to be considered.

show abstract

Section: Discussionmentioning

confidence: 97%

Evolution of Future Black Sea Fish Stocks under Changing Environmental and Climatic Conditions

et al. 2017

View full text Add to dashboard Cite

show abstract

“…He further surmised that unrestrained M. leidyi populations would increase until food resources are depleted and clearly, the significant top-down relationship we established between M. leidyi and their potential prey demonstrates their potential to structure the pelagic community (Figure 6b). It is this prolific reproduction potential coupled with high feeding rates that have led to significant changes in planktonic communities in regions that have seen invasions of M. leidyi (Finenko et al, 2013;Oguz et al, 2012;Roohi et al, 2010), but changes in native communities have also occurred, fueled by development, eutrophication, and hypoxia (Breitburg et al, 1997). Kimmel, Boynton, and Roman (2012) modeled the abundance of Acartia tonsa (Dana, 1849) in Chesapeake Bay.…”

Section: Discussionmentioning

confidence: 99%

“…These have accentuated the impacts that humans are having on the oceans on a global level (Duarte et al, 2012). It is now recognized that the expansion and continuation of gelatinous zooplankton blooms have the potential to significantly affect communities and under introduction to nonnative systems, their potential to permanently disrupt natural food webs has been demonstrated (Oguz et al, 2012). Concurrently, the long-term impacts to commercially important fisheries species is occurring through direct consumption of fish eggs, larvae, and juveniles (Finenko et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Top-Down Impacts of Sea Nettles (Chrysaora quinquecirrha) on Pelagic Community Structure in Barnegat Bay, New Jersey, U.S.A.

Bologna

Gaynor

Barry

et al. 2017

Journal of Coastal Research

View full text Add to dashboard Cite

“…The main ecosystem properties appear to differ considerably between the western, southern, and northeastern regions (Oguz et al, 2012b). The pelagic food web structure of the western shelf represents worst ecological conditions dominated by the absence of forage fish stocks and the persistence of relatively strong Mnemiopsis and Noctiluca predation controls.…”

Section: Post-eutrophication Statementioning

confidence: 99%

Controls of Multiple Stressors on the Black Sea Fishery

Oğuz

2017

Front. Mar. Sci.

View full text Add to dashboard Cite

Black Sea is one of the most severely degraded and exploited large marine ecosystems in the world. For the last 50 years after the depletion of large predatory fish stocks, anchovy (with the partial contribution of sprat) has been acting as the main top predator species and experienced a major stock collapse at the end of 1990s. After the collapse, eastern part of the southern Black Sea became the only region sustaining relatively high anchovy catch (400,000 tons) whereas the total catch within the rest of the sea was reduced to nearly its one-third. The lack of recovery of different fish stocks under a slow ecosystem rehabilitation may be attributed, on the one hand, to inappropriate management measures and the lack of harmonized fishery policy among the riparian countries. On the other hand, impacts of multiple stressors (eutrophication, alien species invasions, natural climatic variations) on the food web may contribute to resilience of the system toward its recovery. The overfishing/recovery problem therefore cannot be isolated from rehabilitation efforts devoted to the long-term chronic degradation of the food web structure, and alternative fishery-related management measures must be adopted as a part of a comprehensive ecosystem-based management strategy. The present study provides a data-driven ecosystem assessment, underlines the key environmental issues and threats, and points to the critical importance of holistic approach to resolve the fishery-ecosystem interactions. It also stresses the transboundary nature of the problem.

show abstract

Regional peculiarities of community-wide trophic cascades in strongly degraded Black Sea food web

Cited by 15 publications

References 10 publications

Evolution of Future Black Sea Fish Stocks under Changing Environmental and Climatic Conditions

Evolution of Future Black Sea Fish Stocks under Changing Environmental and Climatic Conditions

Top-Down Impacts of Sea Nettles (Chrysaora quinquecirrha) on Pelagic Community Structure in Barnegat Bay, New Jersey, U.S.A.

Controls of Multiple Stressors on the Black Sea Fishery

Contact Info

Product

Resources

About