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https://www.readbyqxmd.com/read/29164465/assessment-of-pollutions-and-identification-of-sources-of-heavy-metals-in-sediments-from-west-coast-of-shenzhen-china
#1
Fengwen Huang, Yang Xu, Zhenhao Tan, Zhibing Wu, Hong Xu, Liangliang Shen, Xu Xu, Qingguo Han, Hai Guo, Zhangli Hu
The sediment samples were collected from eight sites located in the Pearl River Estuary and the Shenzhen Bay of the west coast of Shenzhen. The distributions of the seven elements Zn, Cr, Hg, Cu, Cd, Pb and As have been analyzed, and their pollution degrees, corresponding potential ecological risks and source identifications have been studied using geo-accumulation index, potential ecological risk index and integrated multivariate statistical methods, respectively. Based on the calculated geo-accumulation indices, the contamination levels of all elements in the Pearl River Estuary are similar to those in the Shenzhen Bay, reflecting that these elements in the study areas have similar sources because of the adequate seawater exchange...
November 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29163386/evaluating-production-of-cyclopentyl-tetraethers-by-marine-group-ii-euryarchaeota-in-the-pearl-river-estuary-and-coastal-south-china-sea-potential-impact-on-the-tex86-paleothermometer
#2
Jin-Xiang Wang, Wei Xie, Yi Ge Zhang, Travis B Meador, Chuanlun L Zhang
TEX86 [TetraEther indeX of glycerol dialkyl glycerol tetraethers (GDGTs) with 86 carbon atoms] has been widely applied to reconstruct (paleo-) sea surface temperature. Marine Group I (MG-I) Thaumarchaeota were thought to be the primary source of GDGTs constituting the TEX86 formula; however, recent research has suggested that Marine Group II (MG-II) Euryarchaeota may also contribute significantly to the GDGT pool in the ocean. Little is known regarding the potential impact of MG-II Euryarchaeota-derived GDGTs on TEX86 values recorded in marine sediments...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29162098/malaria-early-warning-tool-linking-inter-annual-climate-and-malaria-variability-in-northern-guadalcanal-solomon-islands
#3
Jason Smith, Lloyd Tahani, Albino Bobogare, Hugo Bugoro, Francis Otto, George Fafale, David Hiriasa, Adna Kazazic, Grant Beard, Amanda Amjadali, Isabelle Jeanne
BACKGROUND: Malaria control remains a significant challenge in the Solomon Islands. Despite progress made by local malaria control agencies over the past decade, case rates remain high in some areas of the country. Studies from around the world have confirmed important links between climate and malaria transmission. This study focuses on understanding the links between malaria and climate in Guadalcanal, Solomon Islands, with a view towards developing a climate-based monitoring and early warning for periods of enhanced malaria transmission...
November 21, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29156392/biofilms-as-a-sink-for-antibiotic-resistance-genes-args-in-the-yangtze-estuary
#4
Xing-Pan Guo, Yi Yang, Da-Pei Lu, Zuo-Shun Niu, Jing-Nan Feng, Yu-Ru Chen, Fei-Yun Tou, Emily Garner, Jiang Xu, Min Liu, Michael F Hochella
Biofilms are ubiquitous throughout aquatic environments and they are thought to promote the acquisition and dissemination of antibiotic resistant genes (ARGs). This study focused on the occurrence and distribution of five types of ARG in naturally-occurring biofilms, in comparison to associated sediment and water samples, from the Yangtze Estuary, which borders the meta-city of Shanghai, China. The detection frequency and abundances of most ARGs showed the following order: biofilm > sediment > water, which can be attributed to a high level of antibiotics and metals that can accelerate the generation and propagation of ARGs in biofilms...
November 13, 2017: Water Research
https://www.readbyqxmd.com/read/29154906/increase-in-taxonomic-assignment-efficiency-of-viral-reads-in-metagenomic-studies
#5
S François, D Filloux, M Frayssinet, P Roumagnac, D P Martin, M Ogliastro, R Froissart
Metagenomics studies have revolutionized the field of biology by revealing the presence of many previously unisolated and uncultured micro-organisms. However, one of the main problems encountered in metagenomic studies is the high percentage of sequences that cannot be assigned taxonomically using commonly used similarity-based approaches (e.g. BLAST or HMM). These unassigned sequences are allegorically called « dark matter » in the metagenomic literature and are often referred to as being derived from new or unknown organisms...
November 14, 2017: Virus Research
https://www.readbyqxmd.com/read/29154139/perfluorinated-compounds-in-surface-waters-of-shanghai-china-source-analysis-and-risk-assessment
#6
Rui Sun, Minghong Wu, Liang Tang, Jiajun Li, Zhaoqiu Qian, Tao Han, Gang Xu
17 perfluorinated compounds (PFCs) were systematically investigated in the surface water from principal watersheds of Shanghai, China. 10 PFCs were above the detection limit (0.08-0.28ng/L) in 39 surface water samples. The perfluorooctanoic acid (PFOA) and perfluorobutanesulfonate (PFBS) were the two dominant compounds with a median concentration 50.67ng/L and 29.84ng/L, respectively. Concentrations of perfluorooctanesulfonate (PFOS) were generally less than PFBS, which might result from the global phase-out of PFOS production and the use of PFBS as a substitute for PFOS-based products...
November 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29154134/validation-of-a-biotic-ligand-model-on-site-specific-copper-toxicity-to-daphnia-magna-in-the-yeongsan-river-korea
#7
Jinhee Park, Jin-Sung Ra, Hojung Rho, Jaeweon Cho, Sang Don Kim
The objective of this study was to determine whether the water effect ratio (WER) or biotic ligand model (BLM) could be applied to efficiently develop water quality criteria (WQC) in Korea. Samples were collected from 12 specific sites along the Yeongsan River (YSR), Korea, including two sewage treatment plants and one estuary lake. A copper toxicity test using Daphnia magna was performed to determine the WER and to compare to the BLM prediction. The results of the WER from YSR samples also indicated significantly different copper toxicities in all sites...
November 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29152204/prozac-in-the-water-chronic-fluoxetine-exposure-and-predation-risk-interact-to-shape-behaviors-in-an-estuarine-crab
#8
Joseph R Peters, Elise F Granek, Catherine E de Rivera, Matthew Rollins
Predators exert considerable top-down pressure on ecosystems by directly consuming prey or indirectly influencing their foraging behaviors and habitat use. Prey is, therefore, forced to balance predation risk with resource reward. A growing list of anthropogenic stressors such as rising temperatures and ocean acidification has been shown to influence prey risk behaviors and subsequently alter important ecosystem processes. Yet, limited attention has been paid to the effects of chronic pharmaceutical exposure on risk behavior or as an ecological stressor, despite widespread detection and persistence of these contaminants in aquatic environments...
November 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29151869/when-evolution-is-the-solution-to-pollution-key-principles-and-lessons-from-rapid-repeated-adaptation-of-killifish-fundulus-heteroclitus-populations
#9
REVIEW
Andrew Whitehead, Bryan W Clark, Noah M Reid, Mark E Hahn, Diane Nacci
For most species, evolutionary adaptation is not expected to be sufficiently rapid to buffer the effects of human-mediated environmental changes, including environmental pollution. Here we review how key features of populations, the characteristics of environmental pollution, and the genetic architecture underlying adaptive traits, may interact to shape the likelihood of evolutionary rescue from pollution. Large populations of Atlantic killifish (Fundulus heteroclitus) persist in some of the most contaminated estuaries of the United States, and killifish studies have provided some of the first insights into the types of genomic changes that enable rapid evolutionary rescue from complexly degraded environments...
September 2017: Evolutionary Applications
https://www.readbyqxmd.com/read/29148359/albirhodobacter-confluentis-sp-nov-isolated-from-an-estuary
#10
Hye Su Jung, Jaegeun Lee, Jong Woo Hyeon, Seogang Hyun, Che Ok Jeon
A Gram-stain-negative and strictly aerobic, moderately halophilic bacterium, designated strain S1-47(T), was isolated from estuary sediment in South Korea. Cells were non-motile rods showing oxidase- and catalase-positive activities. Growth was observed at 10-30 °C (optimum, 25 °C), at pH 5.0-8.0 (optimum, pH 6.0-7.0) and in the presence of 0-6.0 % (w/v) NaCl (optimum, 2.0 %). Strain S1-47(T) contained summed feature 3 (comprising C16 : 1ω7c and/or C16 : 1ω6c), summed feature 8 (comprising C18 : 1ω7c and/or C18 : 1ω6c) and C16 : 0 as major cellular fatty acids and ubiquinone-10 as the sole isoprenoid quinone...
November 17, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29146201/arsenic-speciation-in-environmental-multimedia-samples-from-the-youngsan-river-estuary-korea-a-comparison-between-freshwater-and-saltwater
#11
Seongjin Hong, Sung-Deuk Choi, Jong Seong Khim
Differences in the distribution, partitioning, and bioaccumulation characteristics of arsenicals between freshwater and saltwater systems remain poorly understood. To determine the characteristics of distribution and behavior of arsenicals, multimedia environmental samples including water, suspended particles, zooplankton, sediments, and porewater were collected from inner (five sites, freshwater) and outer (five sites, saltwater) regions of the estuary dike of the Youngsan River Estuary in South Korea (Nov...
November 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29145137/uncertainty-in-positive-matrix-factorization-solutions-for-pahs-in-surface-sediments-of-the-yangtze-river-estuary-in-different-seasons
#12
Ruimin Liu, Cong Men, Wenwen Yu, Fei Xu, Qingrui Wang, Zhenyao Shen
To examine the variabilities of source contributions in the Yangtze River Estuary (YRE), the uncertainty based on the positive matrix factorization (PMF) was applied to the source apportionment of the 16 priority PAHs in 120 surface sediment samples from four seasons. Based on the signal-to-noise ratios, the PAHs categorized as "Bad" might drop out of the estimation of bootstrap. Next, the spatial variability of residuals was applied to determine which species with non-normal curves should be excluded. The median values from the bootstrapped solutions were chosen as the best estimate of the true factor contributions, and the intervals from 5th to 95th percentile represent the variability in each sample factor contribution...
October 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145058/occurrence-distribution-and-ecological-risks-of-phthalate-esters-in-the-seawater-and-sediment-of-changjiang-river-estuary-and-its-adjacent-area
#13
Ze-Ming Zhang, Hong-Hai Zhang, Jing Zhang, Qian-Wen Wang, Gui-Peng Yang
A total of 133 seawater samples and 17 sediment samples were collected from 81 sampling sites in the Changjiang River Estuary and its adjacent area and were analyzed for 16 phthalate esters (PAEs). The Σ16 PAE concentrations in the seawater and sediment samples ranged from 180.3ng·L(-1) to 3421ng·L(-1) and from 0.48μg·g(-1) to 29.94μg·g(-1)dry weight (dw), respectively, with mean values of 943.6ng·L(-1) and 12.88μg·g(-1). The distribution of ∑16PAE concentrations in the water column showed that PAE concentrations in the bottom samples were higher than those in the surface samples (except the transect C located inside the Changjiang River Estuary), with the maxima appearing in the bottom layer at the offshore stations...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29136595/modeling-the-temporal-dynamics-of-intertidal-benthic-infauna-biomass-with-environmental-factors-impact-assessment-of-land-reclamation
#14
Ye Yang, Ting Fong May Chui, Ping Ping Shen, Yang Yang, Ji Dong Gu
Anthropogenic activities such as land reclamation are threatening tidal marshes worldwide. This study's hypothesis is that land reclamation in a semi-enclosed bay alters the seasonal dynamics of intertidal benthic infauna, which is a key component in the tidal marsh ecosystem. Mai Po Tidal Marsh, Deep Bay, Pearl River Estuary, China was used as a case study to evaluate the hypothesis. Ecological models that simulate benthic biomass dynamics with governing environmental factors were developed, and various scenario experiments were conducted to evaluate the impact of reclamations...
November 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29132211/aggregation-behavior-of-dissolved-black-carbon-implications-for-vertical-mass-flux-and-fractionation-in-aquatic-systems
#15
Fanchao Xu, Chenhui Wei, Qingqing Zeng, Xuening Li, Pedro J J Alvarez, Qilin Li, Xiaolei Qu, Dongqiang Zhu
The fluvial export of dissolved black carbon (DBC) is a major land-ocean flux in the global black carbon cycle, affecting the size of refractory carbon pool in the oceans. The aggregation behavior of DBC is a significant determinant of its transport and vertical mass flux. In this study, the aggregation kinetics and interaction energy of DBC leached from biochar were investigated. DBC was mainly stabilized by hydration force and underwent structural compacting in divalent cation solutions. Na+ and Mg2+ had limited impact on the colloidal stability of DBC due to the strong hydration of these cations...
November 13, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29124636/green-fabrication-of-gold-nanomaterials-using-staphylococcus-warneri-from-sundarbans-estuary-an-effective-recyclable-nanocatalyst-for-degrading-nitro-aromatic-pollutants
#16
Sudip Nag, Arnab Pramanik, Dhrubajyoti Chattopadhyay, Maitree Bhattacharyya
Microbial synthesis of gold nanoparticles (GNPs) has attracted considerable attention in recent times due to their exceptional capability for the bioremediation of industrial wastes and also for the treatment of wastewater. A bacterial strain Staphylococcus warneri, isolated from the estuarine mangroves of Sundarbans region produced highly stable GNPs by reducing hydrogen auric chloride (HAucl4) salt using intracellular protein extract. The nanoparticles were characterized utilizing ultraviolet-visible spectrophotometry, transmission electron microscopy, scanning electron microscopy, atomic force microscopy, X-ray diffraction, and surface enhanced Raman scattering...
November 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29124366/interannual-water-quality-changes-at-the-head-of-a-tropical-estuary
#17
Cibele Rodrigues Costa, Monica Ferreira da Costa, Mário Barletta, Luís Henrique Bezerra Alves
Waters entering the small estuaries of the Brazilian north-east originate from drainage basins that cross semi-arid and tropical rainforest areas at various levels of use and conservation. Such rivers are often under heavy demand for water supply and other services, such as effluent dilution. The present study examines four consecutive years (2006-2009) of water quality-monitoring data divided by season (rainy and dry) just before the Goiana River enters its estuary. The environmental variables are largely controlled by rainfall patterns...
November 9, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29122343/seasonal-variations-of-nitrous-oxide-fluxes-and-soil-denitrification-rates-in-subtropical-freshwater-and-brackish-tidal-marshes-of-the-min-river-estuary
#18
Xuming Wang, Minjie Hu, Hongchang Ren, Jiabing Li, Chuan Tong, Ronald S Musenze
Estuarine tidal marshes provide favorable conditions for nitrous oxide (N2O) production. Saltwater intrusion caused by sea-level rise would exert complex effects on the production and emission of N2O in estuarine tidal marshes; however, few studies have been conducted on its effects on N2O emissions. Salinity gradients are a common occurrence in estuarine tidal marshes. Studies on production and emission of N2O in tidal marshes with different salinities may elucidate the impact of saltwater intrusion on the emission of greenhouse gases...
November 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29122244/bloom-dynamics-and-chemical-defenses-of-benthic-cyanobacteria-in-the-indian-river-lagoon-florida
#19
Jennifer M Sneed, Theresa Meickle, Niclas Engene, Sherry Reed, Sarath Gunasekera, Valerie J Paul
Cyanobacterial blooms are predicted to become more prominent in the future as a result of increasing seawater temperatures and the continued addition of nutrients to coastal waters. Many benthic marine cyanobacteria have potent chemical defenses that protect them from top down pressures and contribute to the persistence of blooms. Blooms of benthic cyanobacteria have been observed along the coast of Florida and within the Indian River Lagoon (IRL), a biodiverse estuary system that spans 250km along Florida's east coast...
November 2017: Harmful Algae
https://www.readbyqxmd.com/read/29122243/the-influence-of-salinity-in-the-domoic-acid-effect-on-estuarine-phytoplankton-communities
#20
Elise Van Meerssche, James L Pinckney
Toxic species of the diatom genus Pseudo-nitzschia, observed worldwide from coastal waters to the open ocean, produce the neurotoxin domoic acid (DA). DA is an important environmental and economic hazard due to shellfish contamination with subsequent effects on higher trophic levels. Previous research has demonstrated that, among other environmental factors, salinity influences the abundance and toxicity of Pseudo-nitzschia. In this study, the environmental factors driving the growth of Pseudo-nitzschia and the production of dissolved DA (dDA) in North Inlet estuary were examined...
November 2017: Harmful Algae
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