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https://www.readbyqxmd.com/read/29773315/impact-of-dredged-material-disposal-on-soft-bottom-communities-in-a-recurrent-marine-dumping-area-near-to-guadalquivir-estuary-spain
#1
I Donázar-Aramendía, J E Sánchez-Moyano, I García-Asencio, J M Miró, C Megina, J C García-Gómez
This study assesses the effects of dredged material disposal in a recurrent marine dump near the Guadalquivir Estuary (south-western Spain). We compared the changes observed with two reference areas combining a classical ecological approach with new stable isotope techniques to analyse trophic structure. We detected permanent changes in the macrofaunal community structure as well as in the diversity and biotic indices applied, which showed higher values in the disposal area. The community in the marine dump had lost the natural temporal variations observed in the reference areas...
May 7, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29772512/distribution-and-speciation-of-mercury-affected-by-humic-acid-in-mariculture-sites-at-the-pearl-river-estuary
#2
Lingyun Ding, Kaiyun Zhao, Lijuan Zhang, Peng Liang, Shengchun Wu, Ming Hung Wong, Huchun Tao
At the Pearl River Estuary of southern China, mercury and its environmental problems have long been a great concern. This study investigated the distribution and speciation of mercury compounds that are significantly influenced by the increasing content of humic acid (HA, a model natural organic matter) in this region. The inorganic mercury and methyl mercury, being adsorbed and converted at different HA levels, were studied in sediments and surface water at both mariculture and their reference sites. In mariculture sediments with higher HA content (up to 4...
May 14, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29766426/seasonal-variations-and-relationships-between-environmental-parameters-and-heavy-metal-concentrations-in-tissues-of-crassostrea-species-and-in-its-ambience-from-the-tropical-estuaries
#3
Prachi Shenai-Tirodkar, Mangesh Gauns, Girish Kumar, Zakir Ansari
This study aimed to evaluate the relationship between physicochemical parameters and heavy metal (Cu, Ni, Pb, and Cd) concentrations from sediment, seawater, and its accumulation in tissues of oyster species (Crassostrea madrasensis and C. gryphoides) from the three sites (Chicalim Bay (CB), Nerul Creek (NC), Chapora Bay (ChB)) along the Goa coast (India). Results showed enrichment of Cu and Ni in sediment exceeding the effect range low (ERL) level. The higher concentrations of Cu and Ni in sediments and in suspended particulate matter (SPM) from all the study sites are indicative of severe contamination of estuarine and associated habitats...
May 15, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29759229/evaluation-of-polar-organic-chemical-integrative-and-hollow-fibre-samplers-for-the-determination-of-a-wide-variety-of-organic-polar-compounds-in-seawater
#4
Leire Mijangos, Haizea Ziarrusta, Ailette Prieto, Oihane Zugazua, Olatz Zuloaga, Maitane Olivares, Aresatz Usobiaga, Albrecht Paschke, Nestor Etxebarria
The calibration of two passive samplers for the determination of 20 emerging organic compounds in seawater is described in this work: i) a new version of polar organic chemical integrative sampler (POCIS) containing 100 mg of mixed-mode anion exchanger (Strata X-AW) and 100 mg of polymeric HLB (Plexa) sorbent materials and using a highly porous Nylon membrane (30-μm pore size) and ii) polyethersulfone (PES) hollow fibre. Among the studied contaminants, herbicides, hormones, life style products (stimulants and artificial sweeteners), industrial chemicals (corrosion inhibitor and fluorinated compounds), personal care products and several pharmaceuticals were included...
August 1, 2018: Talanta
https://www.readbyqxmd.com/read/29754084/the-samarco-mine-tailing-disaster-a-possible-time-bomb-for-heavy-metals-contamination
#5
Hermano M Queiroz, Gabriel N Nóbrega, Tiago O Ferreira, Leandro S Almeida, Thais B Romero, Sandra T Santaella, Angelo F Bernardino, Xosé L Otero
In November 2015, the largest socio-environmental disaster in the history of Brazil occurred when approximately 50 million m3 of mine tailings were released into the Doce River (SE Brazil), during the greatest failure of a tailings dam worldwide. The mine tailings passed through the Doce River basin, reaching the ecologically important estuary 17 days later. On the arrival of the mine wastes to the coastal area, contamination levels in the estuarine soils were measured to determine the baseline level of contamination and to enable an environmental risk assessment...
May 10, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29753224/diversity-and-distribution-of-archaea-in-global-estuarine-ecosystems
#6
Xiaobo Liu, Jie Pan, Yang Liu, Meng Li, Ji-Dong Gu
Estuarine ecosystem is a unique geographical transitional zone between freshwater and seawater, harboring a wide range of microbial communities including Archaea. Although a large number of Archaea have been detected in such ecosystem, the global patterns in archaeal diversity and distribution are extremely scarce. To bridge this gap, we carried out a comprehensive survey of archaeal communities using ca. 4000 publicly available archaeal 16S rRNA gene sequences (>300 bp) collected from 24 estuaries in different latitude regions...
May 9, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29751431/depositional-history-of-polychlorinated-biphenyls-pcbs-organochlorine-pesticides-ocps-and-polycyclic-aromatic-hydrocarbons-pahs-in-an-amazon-estuary-during-the-last-century
#7
Patrícia A Neves, Fernanda I Colabuono, Paulo A L Ferreira, Silvia K Kawakami, Satie Taniguchi, Rubens C L Figueira, Michel M Mahiques, Rosalinda C Montone, Márcia C Bícego
The sources and depositional history of OCPs (organochlorine pesticides), PCBs (polychlorinated biphenyls) and PAHs (polycyclic aromatic hydrocarbons) over the last 100years were determined in two sediment cores collected in the Amazon region. It was possible to distinguish two depositional periods along the cores. The first period occurred before extensive anthropogenic effects were registered in the sediments. During this time interval, the concentrations of all OCPs and PCBs were below the detection limits (DL), and the PAH concentrations were low and essentially constant (58...
February 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29751316/stable-isotope-insights-into-the-weathering-processes-of-a-phosphogypsum-disposal-area
#8
Evgenia-Maria Papaslioti, Rafael Pérez-López, Annika Parviainen, Francisco Macías, Antonio Delgado-Huertas, Carlos J Garrido, Claudio Marchesi, José M Nieto
Highly acidic phosphogypsum wastes with elevated potential for contaminant leaching are stack-piled near coastal areas worldwide, threatening the adjacent environment. Huge phosphogypsum stacks were disposed directly on the marshes of the Estuary of Huelva (SW Spain) without any impermeable barrier to prevent leaching and thus, contributing to the total contamination of the estuarine environment. According to the previous weathering model, the process water ponded on the surface of the stack, initially used to carry the waste, was thought to be the main washing agent through its infiltration and subsequently the main component of the leachates emerging as the edge outflows...
April 28, 2018: Water Research
https://www.readbyqxmd.com/read/29751297/tidal-fluxes-of-mercury-and-methylmercury-for-mendall-marsh-penobscot-river-estuary-maine
#9
R R Turner, C P J Mitchell, A D Kopec, R A Bodaly
Tidal marshes are both important sites of in situ methylmercury production and can be landscape sources of methylmercury to adjacent estuarine systems. As part of a regional investigation of the Hg-contaminated Penobscot River and Bay system, the tidal fluxes of total suspended solids, total mercury and methylmercury into and out of a regionally important mesohaline fluvial marsh complex, Mendall Marsh, were intensively measured over several tidal cycles and at two spatial scales to assess the source-sink function of the marsh with respect to the Penobscot River...
May 8, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29745190/-changes-of-soil-carbon-nitrogen-and-phosphorus-and-stoichiometry-characteristics-in-marsh-invaded-by-spartina-alterniflora
#10
Bao Shi Jin, Hong Yuan Yan, Wei Qi Wang, Cong Sheng Zeng
To clarify the effect of invasive alien plants on ecosystem functions, soil total carbon (TC), total carbon (TN), and total phosphorus (TP) contents were studied in the exotic invasive plant Spartina alterniflora marsh with different durations and the native species Cyperus malaccensis marsh in the Minjiang River estuary. The results showed that there were different variations of TC, TN and TP at 0-50 cm soil layer in the C. malaccensis marsh invaded by S. alterniflora, but the changes of TC and TN were similar and the change of the TP lagged behind them...
May 18, 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29744698/assessing-the-potential-ecological-risk-of-co-cr-cu-fe-and-zn-in-the-sediments-of-hooghly-matla-estuarine-system-india
#11
Somdeep Ghosh, Madhurima Bakshi, Alok Kumar, A L Ramanathan, Jayanta Kumar Biswas, Subarna Bhattacharyya, Punarbasu Chaudhuri, Sabry M Shaheen, Jörg Rinklebe
Hooghly-Matla estuarine system along with the Sundarbans mangroves forms one of the most diverse and vulnerable ecosystems in the world. We have investigated the distribution of Co, Cr, Cu, Fe and Zn along with sediment properties at six locations [Shamshernagar (S1), Kumirmari (S2 and S3), Petuaghat (S4), Tapoban (S5) and Chemaguri (S6)] in the Hooghly estuary and reclaimed islands of the Sundarbans for assessing the degree of contamination and potential ecological risks. Enrichment factor values (0.9-21.6) show enrichment of Co, Cu and Zn in the intertidal sediments considering all sampling locations and depth profiles...
May 9, 2018: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/29742349/widespread-micropollutant-monitoring-in-the-hudson-river-estuary-reveals-spatiotemporal-micropollutant-clusters-and-their-sources
#12
Corey Carpenter, Damian E Helbling
The objective of this study was to identify sources of micropollutants in the Hudson River Estuary (HRE). We collected 127 grab samples at seventeen sites along the HRE over two years and screened for up to 200 micropollutants. We quantified 168 of the micropollutants in at least one of the samples. Atrazine, gabapentin, metolachlor, and sucralose were measured in every sample. We used data-driven unsupervised methods to cluster the micropollutants based on their spatiotemporal occurrence and normalized-concentration patterns...
May 9, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29741075/-selection-of-isotopic-baselines-in-marine-ecosystems
#13
Yi Gong, Ling Chen, Yun Kai Li
Stable isotope analysis has been widely used in marine food web studies. An appropriate isotopic baseline is essential for calculating diet or trophic position of marine organisms when using stable isotopic data. This paper provided an overview of the selection of isotopic baselines for four ty-pical marine ecosystems, i.e. estuary and bay, neritic zone, oceanic zone, and deep sea. The interferential factors of baseline selection and the significance of compound specific stable isotope in minimizing the effects of temporal-spatial variations of isotopic baseline were summarized, and the issues needed to be solved in this field and several directions for further research were presented...
July 18, 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29735763/diversity-and-dynamics-of-the-canadian-coastal-vibrio-community-an-emerging-trend-detected-in-the-temperate-regions
#14
Swapan K Banerjee, Rebecca Rutley, Jeff Bussey
Vibrio s pecies are indigenous to the marine and estuarine environments around the world and are the leading cause of water and seafood-borne illnesses due to conditions favouring the transmission and growth of the species. Horizontal gene transfer, recombination and mutation enable Vibrio spp to adapt rapidly to environmental challenges from biotic and abiotic parameters, including temperature, salinity and nutrient status of the coastal waters. This surveillance study provides evidence of V. cholerae emerging in the temperate estuaries of Canada, thereby redefining the diversity and dynamics of its coastal Vibrio population...
May 7, 2018: Journal of Bacteriology
https://www.readbyqxmd.com/read/29734612/heavy-metals-and-lead-isotopes-in-soils-road-dust-and-leafy-vegetables-and-health-risks-via-vegetable-consumption-in-the-industrial-areas-of-shanghai-china
#15
Chunjuan Bi, Ya Zhou, Zhenlou Chen, Jinpu Jia, Xinyi Bao
Vegetable fields have a high risk of heavy metal contamination from pollution sources in suburban and industrial areas of cities. Eighty-seven soil samples, 106 leafy vegetables and 48 road dust samples were collected from industrial areas of Shanghai, China. We studied the levels of heavy metals, health risk through consumption of leafy vegetables, and sources of Pb in soils, road dust and leafy vegetables. Soil Cd, Zn, Pb, Cu, Hg and As concentrations exceeded the soil background values in 73.6%, 97.7%, 52...
April 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29730755/effect-of-metals-on-zooplankton-abundance-and-distribution-in-the-coast-of-southwestern-taiwan
#16
Yun-Ru Ju, Wen-Tseng Lo, Chih-Feng Chen, Chiu-Wen Chen, Zhi-Ling Huang, Cheng-Di Dong
Three transects were established along the southwestern coast of Taiwan; transects from north to south were respectively extended from the Kaohsiung Harbor, Kaoping River estuary, and Fangshan River estuary. Six metals including Pb, Cd, Cr, Cu, Zn, and Ni were analyzed in the zooplankton and seawater samples. A total of 24 groups of zooplankton were identified. Calanoid was the frequently collected group and accounted for greater than 40% of the relative abundance of zooplankton. Results showed that metal concentrations in seawater close to coast were higher than those in the outside of transect...
May 5, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29730718/interannual-variability-in-dinophysis-spp-abundance-and-toxin-accumulation-in-farmed-mussels-perna-perna-in-a-subtropical-estuary
#17
T P Alves, M A Schramm, L A O Proença, T O Pinto, L L Mafra
This study evaluated an 8-year dataset (2007 to 2015, except 2008) in the attempt to identify the most susceptible periods for the occurrence of diarrheic shellfish poisoning (DSP) episodes associated with the presence of toxigenic dinoflagellates, Dinophysis spp., in the mussel farming area of Babitonga Bay (southern Brazil). Dinophysis acuminata complex was the most frequent (present in 66% of the samples) and abundant (max. 4100 cells L-1 ) taxon, followed by D. caudata (14%; max. 640 cells L-1 ) and D...
May 5, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29730716/metal-and-isotope-analysis-of-bird-feathers-in-a-contaminated-estuary-reveals-bioaccumulation-biomagnification-and-potential-toxic-effects
#18
L D Einoder, C K MacLeod, C Coughanowr
The Derwent estuary, in south east Tasmania, is highly contaminated with heavy metals, mainly due to past industrial pollution. This study sought to determine the extent of contamination, bioaccumulation, and biomagnification in the resident bird community and therefore to infer the potential for adverse effects in birds. Thirteen metals were measured from breast feathers (n = 51 individuals) of eight sympatric species of aquatic bird. Stable carbon (δ13 C) and nitrogen (δ15 N) isotopes were used to identify dietary sources of contaminants, trophic level, and potential biomagnification through food chains...
May 5, 2018: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29728624/a-regional-scale-approach-to-assessing-current-and-potential-future-exposure-to-tidal-inundation-in-different-types-of-estuaries
#19
David J Hanslow, Bradley D Morris, Edwina Foulsham, Michael A Kinsela
Broad scale assessments of impacts associated with sea level rise have mainly been undertaken using ocean water level data from tide gauges located in harbours and ports assuming that these can be applied directly in mapping inundation throughout estuaries. On many coasts, however, exposure to sea level rise comes about through inundation adjacent to rivers and estuaries, in many instances far from the ocean. In this study, we examine the potential impacts of sea level rise within the diverse estuaries of South East Australia...
May 4, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29727849/metal-accumulation-growth-and-reproduction-of-razor-clam-sinonovacula-constricta-transplanted-in-a-multi-metal-contaminated-estuary
#20
Yizhou Ke, Wen-Xiong Wang
In recent years, elevated metal discharges have seriously affected the health of many estuarine ecosystems in China. This study examined the influences of metal pollution on the growth and reproduction of razor clam, Sinonovacula constricta. An eight-month field experiment was conducted at two sites with different contamination levels in Jiulong River Estuary of Southern China. Concentrations of Ag, As, Cd, Cr, Cu, Ni, Pb and Zn in seawater, suspended particles, surface sediments, and clams, as well as the clam growth and gonad condition were simultaneously determined on a monthly basis...
May 1, 2018: Science of the Total Environment
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