Inorganic phosphorus adsorption in solution by modified biochar derived from tea residue

Materials Today Communications, Journal Year: 2025, Volume and Issue: unknown, P. 111580 - 111580

Published: Jan. 1, 2025

Language: Английский

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

Ecological Indicators, Journal Year: 2024, Volume and Issue: 160, P. 111758 - 111758

Published: Feb. 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.

Language: Английский

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Evaluating the efficacy of fisheries management strategies in China for achieving multiple objectives under climate change

Ocean & Coastal Management, Journal Year: 2023, Volume and Issue: 245, P. 106870 - 106870

Published: Sept. 30, 2023

Language: Английский

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Fish Community Resource Utilization Reveals Benthic–Pelagic Trophic Coupling Along Depth Gradients in the Beibu Gulf, South China Sea

Biology, Journal Year: 2025, Volume and Issue: 14(2), P. 207 - 207

Published: Feb. 16, 2025

Benthic-pelagic coupling is a key approach to studying the structure and energy dynamics of shallow marine food webs. The movement foraging patterns consumers are major drivers nutrient distribution in ecosystems critical for maintaining ecosystem stability. To better understand between coastal habitats, this study employed Bayesian mixture model using SC SI data. By classifying functional groups based on taxonomy, morphological traits, feeding ecology similarities, we constructed trophic network analyzed changes fish benthic-pelagic across environmental gradients. results show that primary carbon sources Beibu Gulf phytoplankton, particulate organic matter (POM), sediment (SOM), with phytoplankton contributing most. Pelagic subsidies dominate web. Small sized, abundant planktivorous benthivorous act both as predators important prey, transferring derived from benthic pelagic zones higher trophic-levels. Larger, higher-trophic-level piscivorous serve couplers, preying organisms various habitats. Depth chlorophyll-a (Chl-a) two variables influencing fish, opposite gradient observed each. Along depth gradient, exhibit clear adaptive strategies. As water increases, tend forage more within their specific habitat (either or pelagic), prey types continually changing, leading gradual reduction strength coupling. This reveals spatial resource utilization strategies Gulf, providing deeper insights into variation It also enhances our understanding responses human pressures global changes, offering valuable perspectives predicting these responses.

Language: Английский

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Status assessment of the Beibu Gulf coastal fishery ecosystem using a multispecies size-spectrum model

Reviews in Fish Biology and Fisheries, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 20, 2025

Language: Английский

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Climate Variability and Fish Community Dynamics: Impacts of La Niña Events on the Continental Shelf of the Northern South China Sea

Journal of Marine Science and Engineering, Journal Year: 2025, Volume and Issue: 13(3), P. 474 - 474

Published: Feb. 28, 2025

This study investigates the impacts of climate variability, particularly La Niña events, on fish community continental shelf northern South China Sea, a region highly sensitive to environmental fluctuations. Historical fishery survey data, collected from autumn 2019 2022, were used analyze changes in species composition, diversity indices, and structure during non-La periods. The results show that significantly altered dynamics. During Niña, cold-water conditions expanded range suitable habitats for species, leading increased dominance Japanese scad (Decapterus maruadsi), with its index relative importance (IRI) reaching 1795.9 1320.2 2021 respectively. In contrast, warm-water experienced reduction habitats. Margalef’s richness (D’) peaked at 23.18 but decreased 20.69 by spring 2022. Shannon–Wiener (H’) dropped 2.597 period (spring 2020) 2.406 2022); similarly, Pielou’s evenness fell 0.4749 0.4396, indicating an increase ecological imbalance. As weakened, began recover. By D’ had risen 22.73 H’ 2.573, reflecting gradual return before event. Species distribution models incorporating key variables (i.e., sea surface temperature, salinity, dissolved oxygen) demonstrated habitat D. maruadsi contracted post-event Our findings highlight sensitivity communities variability underscore adaptive resource management strategies mitigate change marine ecosystems. research provides valuable insights sustaining regional resources under changing conditions.

Language: Английский

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An extensive assessment of exploitation indicators for multispecies fisheries in the South China Sea to inform more practical and precise management in China

Ecological Indicators, Journal Year: 2025, Volume and Issue: 173, P. 113363 - 113363

Published: March 17, 2025

Language: Английский

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Detecting fish community structure in open waters using environmental DNA: a case study from the central South China Sea

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 12

Published: March 27, 2025

Monitoring fish diversity in open ocean environments presents substantial challenges, particularly due to the limitations of traditional sampling methods such as trawling, which are costly, labor-intensive, and ineffective for deeper water layers. Environmental DNA (eDNA) technology offers an economical efficient alternative, complementing conventional survey techniques. In this study, eDNA analysis was employed characterize species composition central South China Sea (SCS). Additionally, generalized additive models (GAMs) were applied 5 m 200 depth layers assess influence environmental variables on communities. A total 190 species, spanning 32 orders, 68 families, 135 genera, detected across eight sites. The harbored 184 178 respectively, with 172 common both α-and β-diversity analyses revealed no significant differences or between two depths ( p > 0.05). GAM results highlighted temperature a key driver distribution, effects abundance at < These findings underscore utility monitoring elucidating ecological mechanisms shaping vertical distribution deep-sea ecosystems. Given logistical constraints environments, eDNA-based approaches offer valuable insights sustainable management conservation fishery resources SCS.

Language: Английский

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Assessing the stock status of Megalaspis cordyla in the northern Arabian Sea: a multi-model approach for sustainable fishery management

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 12

Published: April 2, 2025

Effective fisheries management is crucial for the sustainable use of fishery resources, increasing relying on stock assessments. The Megalaspis cordyla an economically important fish species in Pakistan, require accurate assessment its current biomass to take effective strategies. This study utilized techniques, including Catch-Based Monte Carlo Maximum Sustainable Yield (CMSY), length-based Bayesian Biomass (LBB), Just Another Assessment (JABBA), and ARIMA models. While CMSY, BSM, JABBA, rely annual catch-effort data, while LBB analyzes length-frequency data along with resilience inputs. An analysis 15 years catch (2007-2021), 1,442 from Pakistani waters revealed that overfished both terms exploitation (LBB at F/M = 1.6, B/B MSY 0.76 0 0.27). CMSY method estimated biological reference points as r 0.53, k 231, a maximum yield (MSY) 3.06. In comparison, BSM provide values =0.03, =271, 2.56. JABBA model 3.637, 2021 (B 2021/ B ) 0.68 F /F 1.56, indicating excessive exploitation. projected ratio /B 0.798, is<1, confirms overexploitation. Additionally, (2, 0, 1) model, demonstrated lowest mean square error, predicts significant upward trend catches near future. findings across all models consistently indicate M. overfished, exceeding limits. Biological models, below 1.0, underscore unsustainable fishery. If continues, faces substantial risk collapse. To mitigate this, immediate measures should be implemented promote utilization this critical resource Pakistan.

Language: Английский

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The initial assessment of an important pelagic fish, Mackerel Scad, in the South China Sea using data‐poor length‐based methods

Marine and Coastal Fisheries, Journal Year: 2023, Volume and Issue: 15(5)

Published: Oct. 1, 2023

Abstract Objective Scads Decapterus spp. occur widely throughout tropical, subtropical, and temperate oceans are both economically ecologically important species. They among the main commercial fish species caught by light falling‐net fishery in South China Sea, which is dominated Mackerel Scad macarellus Shortfin D. macrosoma . Stock assessment an approach used to guide effective management maintain sustainability. Methods Two data‐poor methods, namely length‐based Bayesian biomass estimation spawning potential ratio, were applied assess status of Scad, most dominant Sea. Electronic length–frequency analysis was estimate von Bertalanffy growth parameters (asymptotic length L inf coefficient K ) serve as priors. Result The results show estimated Sea 36.0 cm 0.37/year, respectively. Estimated natural mortality 0.74/year, mean fork at 50% sexual maturity 24.29 cm. Length‐based showed that relative stock size had decreased from 1.3 2012–2014 0.7 2019–2021, indicating overfished status. ratio for this 13% 12%, significantly below limit reference point 20%. Conclusion Our obtained through methods indicate lower SPR due catching excess juveniles. Therefore, we highlight need increase minimum mesh fishing nets strengthen international cooperation conserving shared

Language: Английский

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