Climate change impacts on small pelagic fish distribution in Northwest Africa: trends, shifts, and risk for food security

Scientific Reports, Год журнала: 2024, Номер 14(1)

Опубликована: Июнь 3, 2024

Climate change is recognised to lead spatial shifts in the distribution of small pelagic fish, likely by altering their environmental optima. Fish supply along Northwest African coast significant at both socio-economic and cultural levels. Evaluating impacts climatic on fish a challenge serious concern context shared stock management. impact climate trend analysis was conducted using data from 2363 trawl samplings 170,000 km acoustics sea surveys. Strong warming reported across Southern Canary Current Large Marine Ecosystem (CCLME), extending Morocco Senegal. Over 34 years, several trends emerged, with southern CCLME experiencing increases wind speed upwelling intensity, particularly where coastal already strongest. Despite upwelling-induced cooling mechanisms, surface temperature (SST) increased most areas, indicating complex interplay climatic-related stressors shaping marine ecosystem. Concomitant northward species were attributed long-term SST decrease productivity south. The abundance Sardinella aurita, abundant coast, has subtropics fallen intertropical region. Spatial biomass observed for other exploited species, similar those recorded isotherms. An intensification intensity within northern central regions system documented without primary productivity. In contrast, stable region, while there decline These differences affected national boundaries. This adds new threat these recently overexploited stocks, making sustainable management more difficult. Such changes must motivate common regional policy considerations food security sovereignty all West countries sharing same stocks.

Язык: Английский

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Mixed-stock analysis of Atlantic herring (Clupea harengus): a tool for identifying management units and complex migration dynamics

ICES Journal of Marine Science, Год журнала: 2023, Номер 80(1), С. 173 - 184

Опубликована: Янв. 1, 2023

Abstract We developed and validated a mixed-stock analysis (MSA) method with 59 single-nucleotide polymorphisms selected from genome-wide data to assign individuals populations in samples of Atlantic herring the North Baltic seas. analysed 3734 spawning locations scientific catches mixed feeding stocks demonstrate “one-fits-all” tool unprecedented accuracy for monitoring spatio-temporal dynamics throughout large geographical range complex stock mixing. re-analysed time-series (2002–2021) compared inferences about composition estimates morphological data. show that contributions western spring-spawning complex, which is under management concern, have likely been overestimated. also genetically distinctive population autumn spawners, ascribed low fisheries importance, contributes non-negligible potentially temporally increasing proportions aggregations, calling re-evaluation definitions. MSA can be implemented assessment variety applications, including marine ecosystem description, impact specific fleets, stock-rebuilding plans.

Язык: Английский

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Impact of climate change on the distribution of Trachurus japonicus in the Northern South China Sea

Ecological Indicators, Год журнала: 2024, Номер 160, С. 111758 - 111758

Опубликована: Фев. 23, 2024

Understanding the impact of climate change on distribution marine species is vital importance for sustainable development fisheries. In this study, an ensemble model employed to predict potential Japanese jack mackerel (Trachurus japonicus) in Northern South China Sea (NSCS) under current conditions and three future scenarios (IPCC Representative Concentration Pathways RCP126, RCP245, RCP585). The incorporates environmental variables including sea surface salinity (SSS), height above geoid (SSH), temperature (SST), ocean mixed layer thickness (MLD), distance from land (DFL). Notably, SST SSH are found be most influential factors defining habitat T. japonicus. Model predictions reveal that suitable habitats japonicus primarily located offshore area west Pearl River estuary, especially waters with depths less than 100 m NSCS. Beibu Gulf emerges as a prominent species. However, projections indicate significant reduction areas high probability occurrence, particularly emissions. This observed NSCS at ranging 40 m, while northwestern coastal regions projected witness increase habitats. rate contraction expected surpass expansion, estimated 16.93 % 29.27 decrease by 2091–2100.These findings offer fundamental insights into how impacts provide valuable guidance resource utilization.

Язык: Английский

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Climate-induced small pelagic fish blooms in an overexploited marine ecosystem of the South China Sea

Ecological Indicators, Год журнала: 2022, Номер 145, С. 109598 - 109598

Опубликована: Окт. 29, 2022

Marine ecosystems are a primary conservation concern because of the separate and synergistic effects overfishing climate change on their productivity biodiversity. For purpose implementing ecosystem-based fisheries management, it is essential to understand how fish stocks respond in marine ecosystems, especially those that have been overexploited. The Beibu Gulf northwestern part South China Sea has long one China's major fishing grounds. After collapse demersal ecosystem 1990 s, small pelagic fishes, including Japanese jack mackerel (Trachurus japonicus) scad (Decapterus maruadsi), occupied more-important ecological niche this gulf. However, insufficient research creates great uncertainty for current management measures. This study used data trawl surveys environmental investigate possible mechanisms leading dramatic fluctuations populations ecosystem. Abnormal blooms fish, T. japonicus D. maruadsi, occurred following four La Niña events (in 2007/2008, 2010/2011, 2011/2012, 2020/2021). Moreover, dominant species shifted observably regularly, Shannon–Wiener diversity Pielou's evenness decreased significantly northeastern coastal waters gulf, spatial pattern community was reorganized summers probably resulted from combination change, overfishing, summer moratorium, which thereby caused series responses Fluctuations after seemed more stocks. Therefore, we emphasize need ecosystem-based, preventive, adaptive management.

Язык: Английский

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Drivers of conflict and resilience in shifting transboundary fisheries

Marine Policy, Год журнала: 2023, Номер 155, С. 105740 - 105740

Опубликована: Июль 17, 2023

Язык: Английский

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Expected contraction in the distribution ranges of demersal fish of high economic value in the Mediterranean and European Seas

Scientific Reports, Год журнала: 2022, Номер 12(1)

Опубликована: Июнь 16, 2022

Abstract Fisheries and aquaculture are facing many challenges worldwide, especially adaptation to climate change. Investigating future distributional changes of largely harvested species has become an extensive research topic, aiming at providing realistic ecological scenarios on which build management measures, help fisheries adapt climate-driven changes. Here, we use ensemble modelling approach estimate the contemporary range eight demersal fish high economic value in Mediterranean Sea. We identify a cardinal influence (i) temperature distributions, all being shaped by yearly mean seasonality sea bottom temperature, (ii) primary production. By assessing effects conditions under three Representative Concentration Pathway (RCP2.6, RCP4.5 RCP8.5) over periods twenty-first century, project contraction Sea, with general biogeographical displacement towards North European coasts. This will anticipating catch potential warmer world, is expected have substantial consequences for fisheries.

Язык: Английский

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Spatiotemporal dynamics of spawning habitat distribution of American shad (Alosa sapidissima) in the Hudson River Estuary under multi stressors

Canadian Journal of Fisheries and Aquatic Sciences, Год журнала: 2024, Номер 81(5), С. 559 - 572

Опубликована: Янв. 31, 2024

Diadromous fishes, known for their extensive migrations between freshwater and marine ecosystems, are highly vulnerable to environmental fluctuations human activities, making them prone population declines. Despite awareness of climate change impacts habitat limitations, the remaining spawning habitat’s biogeography is understudied. The present study focuses on Hudson River Estuary (HRE) American shad ( Alosa sapidissima) which experiencing historically low stock levels, as a case investigate spatiotemporal distribution its existing habitat. Generalized additive models were used effect some (e.g., temperature, river bottom type) sampling variables location time) spatial shad. Our results provide compelling evidence an optimal shad, suggesting that factors may not be primary drivers shaping grounds. significant relationships biomass indicates beyond HRE likely play most roles in population.

Язык: Английский

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Evolution and recent trends of Indian oil sardine research: A review

Ocean & Coastal Management, Год журнала: 2024, Номер 258, С. 107396 - 107396

Опубликована: Сен. 23, 2024

Язык: Английский

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Worldwide Appraisal of Knowledge Gaps in the Space Usage of Small Pelagic Fish: Highlights Across Stock Uncertainties and Research Priorities

Reviews in Fisheries Science & Aquaculture, Год журнала: 2025, Номер unknown, С. 1 - 62

Опубликована: Фев. 14, 2025

Understanding the spatial structure of life cycle components small pelagic fish (SPF) stocks is key for deciphering population dynamics and ensuring sustainable management. The extent different stages ecologically relevant processes (e.g., reproduction) temporally dynamic responds to environmental, genetic, demographic constraints. Knowledge gaps on within-stock variability SPF worldwide were identified clupeoid (Clupeidae/Engraulidae). From 3229 Web Science-indexed articles reviewed, data systematically extracted from 299. This information was supplemented with another 105 documents databases official surveys stock assessments. Overall, this review compiled 111 datasets (77 stocks) involving 17 assessed or commercially species across 19 Large Marine Ecosystems (LMEs) 38 coastal ecoregions. Only approximately 40% used in study covered known presumed distribution at least one life-cycle variable: Adults (feeding area, spawning migration, feeding overwintering presence/biomass), juveniles (presence/biomass, nursery area), larvae (larval routes). Despite more extensive some Eastern Boundary Upwelling Systems (EBUS) long-managed stocks, important remain due quality, identity ambiguity, biases. Key could be existing surveys, but there various limitations access spatiotemporal coverage. main consequences are a series priority research/monitoring actions recommended mitigate these improve our ability address stocks.

Язык: Английский

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Evaluating effects of data quality and variable weighting on habitat suitability modelling

Ecological Informatics, Год журнала: 2025, Номер unknown, С. 103086 - 103086

Опубликована: Фев. 1, 2025

Язык: Английский

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