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Resultados 2131-2140 de 7,290
Geochemical baseline establishment and pollution assessment of heavy metals in the largest coastal lagoon (Pinqing Lagoon) in China mainland Texto completo
2022
Xian, Hanbiao | Dong, Xuhui | Wang, Yu | Li, Yan | Xing, Jinhuai | Jeppesen, Erik
Establishing geochemical baselines and assessment of heavy metal pollution in lagoon sediments are critical for providing guidance to coastal zone environmental management. We analyzed heavy metals in high-resolution sediment cores from Pinqing Lagoon in South China, and defined the baselines of common pollution elements with a significant anthropogenic contribution. With these baselines, a spatiotemporal pollution assessment revealed Cu and Cd as the predominant pollution metals in both core and surface sediments, although the ecological risk level in the interior lagoon remained low during the past ~170 years. Surface sediment pollution status indicate a significant spatial difference. The findings from this typical coastal lagoon evidence a strong self-clean capacity attributable to the frequent water-mass-energy exchange between the lagoon and the sea. Furthermore, despite the significant impact by the sea, the geochemical baselines are close to the catchment soil backgrounds that can be defined using a paleolimnological approach.
Mostrar más [+] Menos [-]Occurrence, potential sources and ecological risk estimation of microplastic towards coastal and estuarine zones in Malaysia Texto completo
2022
Zainuddin, Azim Haziq | Ahmad Zaharin Aris, | Zaki, Muhammad Rozaimi Mohd | Fatimah Md. Yusoff, | Wee, Sze Yee
Extensive global plastic production has led to microplastic (MP) pollution of marine ecosystems. This study analysed the abundance of MPs in the surface water of tropical coastal and estuarine zones in Malaysia affected by rapid urbanisation and intense human activity. It also estimated the risk posed by MPs to the marine environment. Mean MP abundance ranged from 2.10 to 6.80 particles/L. Fourier-transform infrared spectroscopic analysis found that the MP polymers were dominated by cellophane (54%), followed by polyester (33%) and polyethylene (2%). The risk posed by MPs was estimated with the risk quotient (RQ) method which found no potential ecological risk to both coastal and estuarine areas (RQ < 1). This study will serve as a baseline for future monitoring of MP pollution of marine water to assess the impact of heavily urbanised coastal and estuarine zones.
Mostrar más [+] Menos [-]Spatio-temporal assessment of COVID-19 lockdown impact on beach litter status and composition in Goa, India Texto completo
2022
Nigam, Ritwik | Luis, Alvarinho J. | Prasad, Pankaj | Kuttikar, Sachit | Yadav, Ramanand | Vaz, Eric | Kotha, Mahender
The study aimed to understand beach litter status at some of the world-famous beaches of Goa, West India, to comprehend the impact of the Covid-19 lockdown. We characterize litter in six categories (Nylon+Rubber, Plastics, Footwear, Glass, Metal, and Thermocol) for eight sampled beaches in the north and south Goa. All beaches show increased glass and decreased plastics (significant litter) during the lockdown period compared to the unlock period that marked the high tourist inflow. Beaches were classified and graded with colour codes using litter density exhibit light blue-green colour coding during the lockdown or unlock period, suggests clean maintenance. The Miramar beach located in the heart of the capital city showed relatively more litter density (yellow code) due to the combination of local people and tourist inflow. Morjim, Palolem, Velsao were littered the least during both periods.
Mostrar más [+] Menos [-]Progress in ‘taxonomic sufficiency’ in aquatic biological investigations Texto completo
2022
Chen, Xuechao | Han, Meiaoxue | Liang, Yantao | Zhao, Wanting | Wu, Yuejiao | Sun, Ying | Shao, Hongbing | McMinn, Andrew | Zhu, Liyan | Wang, Min
The ‘taxonomic sufficiency’ (TS) approach has been applied to algae, protists, invertebrates, and vertebrates, generally by aggregating species-level abundance data to a higher taxonomic level, where genus-level data are often highly correlated with species-level data and are a valid proxy level. The TS approach offers the possibility of a comparison of data from different geographical areas and highlights the effects of contaminants. The TS approach is stable in the face of different researchers and in the comparison of long-term biological survey data. The effectiveness of the TS approach may increase with increasing environmental gradients or spatial area. The TS approach should be avoided when the spatial area is small and small differences in species-level data are considered important, so as not to cancel out the distribution patterns specific to the local environment of the biological taxa.
Mostrar más [+] Menos [-]Oceanic plastic pollution caused by Danish seine fishing in Norway Texto completo
2022
Syversen, Tore | Lilleng, Grethe | Vollstad, Jørgen | Hanssen, Bård Johan | Sønvisen, Signe A.
Oceanic plastic pollution caused by Danish seine fishing in Norway Texto completo
2022
Syversen, Tore | Lilleng, Grethe | Vollstad, Jørgen | Hanssen, Bård Johan | Sønvisen, Signe A.
Wear and tear on fishing gear is a sparsely investigated source of microplastic pollution in the sea. In Norway, Danish seine ropes and trawls are the fishing gears that contribute most to this pollution. The main reason for this pollution is that the seine ropes are dragged along the seabed over a considerable distance, creating a friction force that results in high ropes wear. This note reports the findings after examining the wear of Danish seine ropes used in Norwegian fisheries. The results show that, in Norway alone, an average of 77 to 97 tons of plastic will be added to the sea annually due to this specific fishing gear. Aggregated to include all fly dragging, anchor seining, and pair seining globally, this number is estimated to be about 311 tons per year.
Mostrar más [+] Menos [-]Oceanic plastic pollution caused by Danish seine fishing in Norway Texto completo
2022
Syversen, Tore | Lilleng, Grethe | Vollstad, Jørgen | Bård, Hanssen | Sønvisen, Signe Annie
Wear and tear on fishing gear is a sparsely investigated source of microplastic pollution in the sea. In Norway, Danish seine ropes and trawls are the fishing gears that contribute most to this pollution. The main reason for this pollution is that the seine ropes are dragged along the seabed over a considerable distance, creating a friction force that results in high ropes wear. This note reports the findings after examining the wear of Danish seine ropes used in Norwegian fisheries. The results show that, in Norway alone, an average of 77 to 97 tons of plastic will be added to the sea annually due to this specific fishing gear. Aggregated to include all fly dragging, anchor seining, and pair seining globally, this number is estimated to be about 311 tons per year.
Mostrar más [+] Menos [-]Oceanic plastic pollution caused by Danish seine fishing in Norway | Oceanic plastic pollution caused by Danish seine fishing in Norway Texto completo
2022
Syversen, Tore | Lilleng, Grethe | Vollstad, Jørgen | Bård, Hanssen | Sønvisen, Signe Annie
Wear and tear on fishing gear is a sparsely investigated source of microplastic pollution in the sea. In Norway, Danish seine ropes and trawls are the fishing gears that contribute most to this pollution. The main reason for this pollution is that the seine ropes are dragged along the seabed over a considerable distance, creating a friction force that results in high ropes wear. This note reports the findings after examining the wear of Danish seine ropes used in Norwegian fisheries. The results show that, in Norway alone, an average of 77 to 97 tons of plastic will be added to the sea annually due to this specific fishing gear. Aggregated to include all fly dragging, anchor seining, and pair seining globally, this number is estimated to be about 311 tons per year. | publishedVersion
Mostrar más [+] Menos [-]Contamination and distribution of buried microplastics in Sarakkuwa beach ensuing the MV X-Press Pearl maritime disaster in Sri Lankan sea Texto completo
2022
Sewwandi, Madushika | Amarathunga, A.A.D. | Wijesekara, Hasintha | Mahatantila, Kushani | Vithanage, Meththika
Abundance of buried microplastics in sand profiles and pellet pollution index at Sarakkuwa beach, at west-coast of Sri Lanka was studied as a case study due to the receival of plastic nurdles and debris from the MV X-Press Pearl ship disaster in May 2021. Sand collected at 7 locations to a depth of 2 m in different depths for a beach segment of 200 × 25 m² during October 2021 and sand samples obtained from beach surface during March 2020 from the same location were analyzed for microplastics. Beach was contaminated with 2–5 mm sized partially pyrolyzed LDPE fragments and nurdles demonstrating a peak abundance of 13.3702 g/kg and1 mm-500 μm sized LDPE fragments up to 2.0 m depth. High concentrations of Mo and Cr were observed in the sand collected in 2021. Sarakkuwa beach is critically polluted by nurdles, partially pyrolyzed microplastics, and toxic elements from ship disaster.
Mostrar más [+] Menos [-]Mediterranean microplastic contamination: Israel's coastline contributions Texto completo
2022
Rubin, Andrey Ethan | Omeysi, Limor | Zucker, Ines
This study provides an analysis of the current state of microplastic (MP) contamination along the Mediterranean coastline of Israel. Six strategic sites were monitored in this study – each representing a unique coastal environment. We conclude that Tel Aviv and Hadera, both located near stream estuaries, were highly contaminated (18,777 particles/m³) with MP compared to the other locations. The MP detected included both secondary MP and pristine polymeric pellets. In-depth characterization of the MP illustrated a large percentage of both fragmented and film MP morphologies and the most common MP polymers were polyethylene and polypropylene. Further particle analysis showed that MPs were contaminated with biofilm, including microorganisms such as diatoms, as well as metal residues. Through the spatial analysis presented herein we suggest that local rivers are significant contributors to MP contamination along the Mediterranean Sea coastline of Israel and may pose a direct threat to environment and human health.
Mostrar más [+] Menos [-]Distribution and pollution risk assessment of heavy metals in the surface sediment of the intertidal zones of the Yellow River Estuary, China Texto completo
2022
Wang, Zhe | Lin, Kuixuan | Liu, Xiaoshou
Eleven heavy metals (V, Cr, Mn, Co, Fe, Ni, Cu, Zn, As, Cd, and Pb) in surface sediment in the intertidal zones of the Yellow River Estuary, China were analyzed by inductively coupled plasma-mass spectrometry in summer and autumn 2019. Results indicated that the 11 heavy metals had the same sources. Sediment particle size and total organic matter were the main factors influencing the distribution of heavy metals. Most sites in the intertidal zones of the study area were not contaminated with V, Cr, Fe, Co, Zn, Pb, Cu, As, Mn and Ni, while Cd was the priority pollutant. Heavy metal pollution risk in autumn was higher than that in summer, which may be due to hydrodynamic effects. The present study showed that the heavy metal concentrations in the study area had a temporal decreasing trend compared to previous studies, which may be due to the reduction in human activities.
Mostrar más [+] Menos [-]Can tidal events influence analysis on colonization dynamics in body-size spectrum of periphytic ciliates for marine bioassessment? Texto completo
2022
Zhong, Xiaoxiao | Yu, Shitao | Xu, Henglong | Kim, Sanghee
The tidal influence on body-size spectrum of the protozoan periphytons was explored by using the conventional slide system (CS) and the polyurethane foam enveloped slide system (PFES) in coastal waters during a 1-month study. During the colonization process, clear temporal patterns of the body-size spectrum were observed using the two sampling methods. In terms of relative species number and frequency of occurrence, the rank S4 represented a more stable temporal variability in the PFES system than the CS system during the colonization. Additionally, the small forms (e.g., S1, S2, and S3) were more abundant in the PFES system. The clustering and bootstrapped average analyses demonstrated differences in body-size spectrum of protozoans between the two sampling systems. Our results imply that the body-size spectrum of protozoan periphytons may be impacted by tidal events during colonization process in marine waters.
Mostrar más [+] Menos [-]Coastal gradients of small microplastics and associated pollutants influenced by estuarine sources Texto completo
2022
González-Ortegón, Enrique | Sendra, Marta | Sparaventi, Erica | F. Sánchez Leal, Ricardo | de los Ríos, Isaac | Baldó, Francisco | González-Fernández, Daniel | Yeste, María Pilar
Coastal gradients of small microplastics and associated pollutants influenced by estuarine sources Texto completo
2022
González-Ortegón, Enrique | Sendra, Marta | Sparaventi, Erica | F. Sánchez Leal, Ricardo | de los Ríos, Isaac | Baldó, Francisco | González-Fernández, Daniel | Yeste, María Pilar
Small microplastics (SMPs) in the gulf of Cadiz was sampled at 5 m depth by pumping it through the ship's pipe system and filtered through a 45 μm mesh size net. Our study reveals that higher densities have been found (130 mg·m⁻³) compared to other regions worldwide and these densities decreased from the coastline to the outer stations, showing a general coastal gradient influenced by estuarine outflows. SMPs with a size range between 45 and 193 μm were predominant and most of them composed by polyethylene and polypropylene. The metals associated with the MPs were mainly Na (21.1%), K (11.3%), Fe (8.5%), Ca (2.1%), Cr (1.8%), Zr (13.3%) and Hf (0.7%). The high proportion of Zr compared to Fe, which is different from what can be found in the environment, suggests that this metal is intrinsic to the materials used in catalytic processes during plastic production.
Mostrar más [+] Menos [-]Coastal gradients of small microplastics and associated pollutants influenced by estuarine sources Texto completo
2022
González-Ortegón, E. (Enrique) | Sendra, M. (Marta) | Sparaventi, E. (Erica) | Sánchez-Leal, R.F. (Ricardo Félix) | de-los-Ríos, I. (Isaac) | Baldó, F. (Francisco) | González-Fernández, D.(Daniel) | Yeste, M.P. (María Pilar)
2,359 | Small microplastics (SMPs) in the gulf of Cadiz was sampled at 5 m depth by pumping it through the ship's pipe system and filtered through a 45 μm mesh size net. Our study reveals that higher densities have been found (130 mg·m−3) compared to other regions worldwide and these densities decreased from the coastline to the outer stations, showing a general coastal gradient influenced by estuarine outflows. SMPs with a size range between 45 and 193 μm were predominant and most of them composed by polyethylene and polypropylene. The metals associated with the MPs were mainly Na (21.1%), K (11.3%), Fe (8.5%), Ca (2.1%), Cr (1.8%), Zr (13.3%) and Hf (0.7%). The high proportion of Zr compared to Fe, which is different from what can be found in the environment, suggests that this metal is intrinsic to the materials used in catalytic processes during plastic production.
Mostrar más [+] Menos [-]Coastal gradients of small microplastics and associated pollutants influenced by estuarine sources Texto completo
2022
González-Ortegón, Enrique | Sendra, Marta | Sparaventi, Erica | Sánchez Leal, Ricardo | Ríos, Isaac de los | Baldó, Francisco | González-Fernández, Daniel | Yeste, María Pilar | European Commission
9 pages, 5 figures.-- Under a Creative Commons license | Small microplastics (SMPs) in the gulf of Cadiz was sampled at 5 m depth by pumping it through the ship's pipe system and filtered through a 45 μm mesh size net. Our study reveals that higher densities have been found (130 mg·m−3) compared to other regions worldwide and these densities decreased from the coastline to the outer stations, showing a general coastal gradient influenced by estuarine outflows. SMPs with a size range between 45 and 193 μm were predominant and most of them composed by polyethylene and polypropylene. The metals associated with the MPs were mainly Na (21.1%), K (11.3%), Fe (8.5%), Ca (2.1%), Cr (1.8%), Zr (13.3%) and Hf (0.7%). The high proportion of Zr compared to Fe, which is different from what can be found in the environment, suggests that this metal is intrinsic to the materials used in catalytic processes during plastic production | Financial support to EGO and the instrument was given by CSIC through Intramural Research program 2018 under grant number 201830I081. MS is grateful to the Spanish Ministry of Science, Innovation and Universities for the Juan de la Cierva (TJFI-2017-32493) contract. DGF was funded by European Union's H2020-MSCA-IF-2018 846843—LitRivus | Peer reviewed
Mostrar más [+] Menos [-]Supplementary Material Coastal gradients of small microplastics and associated pollutants influenced by estuarine sources Texto completo
2022
González-Ortegón, Enrique | Sendra, Marta | Sparaventi, Erica | Sánchez Leal, Ricardo | Ríos, Isaac de los | Baldó, Francisco | González-Fernández, Daniel | Yeste, María Pilar | González-Ortegón, Enrique [[email protected]]
13 pages. -- File includes: Supplementary Text, Supplementary Figures and tables. -- Figure SI1. Illustrations by dbRDA of the relationships between the predictors modelled and the concentration of microplastics from the DistLM analysis of all sampling stations (n = 28) (the best model, see table 1). -- Figure SI2 SEM image (left) and Optic Microscopy image (right) of two stations sampled. -- Figure SI3. FTIR spectra of microplastic collected from the Gulf of Cadiz. FTIR spectra contain a mixture of all these plastics . -- Figure SI4. Rainfall and Dam freshwater discharge in the Guadalquivir estuary: Average monthly rainfall and dam discharges between March and June from 1997 to 2018. -- Figure SI5. The currents at the near‐surface level (cm/s) superimposed with sea surface temperature (SST in the rage 17-20ºC) and chlorophyll concentration (Chl-a, in the range 0-3.2 mg / m3) for 15th June 2019. -- Table SI1. Dataset with station name, concentration of microplastic, temperature (ºC), salinity, chlorophyll a fluorescence (mg m-3), oxygen (mg L-1), longitude and latitude in June 2019 between the days 14 and 19. -- Table SI2. Test statistics for the Distance-based Linear Model (DISTLM) analyses of the marginal and sequential tests based on ‘Step-wise’ procedure and AICc criteria of the microplastics at the 28 sites sampled. -- Table SI3. Information collected about MP surveys in environmental marine environments. | Peer reviewed
Mostrar más [+] Menos [-]Coastal gradients of small microplastics and associated pollutants influenced by estuarine sources Texto completo
2022
González-Ortegón, Enrique | Sendra, Marta | Sparaventi, Erica | Sanchez Leal, Ricardo F. | Ríos Hierro, Isaac de los | Baldó, Francisco | González Fernández, Daniel | Yeste Siguenza, María del Pilar | Biología | Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
Small microplastics (SMPs) in the gulf of Cadiz was sampled at 5 m depth by pumping it through the ship's pipe system and filtered through a 45 mu m mesh size net. Our study reveals that higher densities have been found (130 mg.m(-3)) compared to other regions worldwide and these densities decreased from the coastline to the outer stations, showing a general coastal gradient influenced by estuarine outflows. SMPs with a size range between 45 and 193 mu m were predominant and most of them composed by polyethylene and polypropylene. The metals associated with the MPs were mainly Na (21.1%), K (11.3%), Fe (8.5%), Ca (2.1%), Cr (1.8%), Zr (13.3%) and Hf (0.7%). The high proportion of Zr compared to Fe, which is different from what can be found in the environment, | Financial support to EGO and the instrument was given by CSIC through Intramural Research program 2018 under grant number 201830I081. MS is grateful to the Spanish Ministry of Science, Innovation and Universities for the Juan de la Cierva (TJFI-2017-32493) contract. DGF was funded by European Union's H2020-MSCA-IF-2018 846843-LitRivus.
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