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https://www.readbyqxmd.com/read/28641229/effects-of-short-term-invasion-of-spartina-alterniflora-and-the-subsequent-restoration-of-native-mangroves-on-the-soil-organic-carbon-nitrogen-and-phosphorus-stock
#1
Jianxiang Feng, Jian Zhou, Liming Wang, Xiaowei Cui, Cunxin Ning, Hao Wu, Xiaoshan Zhu, Guanghui Lin
The exotic cordgrass Spartina alterniflora has severely invaded the mangrove wetlands in southern China and ecological restoration using native mangroves was conducted in an attempt to control this invasive species. In this study, the contents and pools of soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) were quantified to investigate the invasive effects of S. alterniflora and then to evaluate whether the ecological restoration of native mangrove could reverse those effects. S. alterniflora only showed significantly higher organic carbon content in the surface 0-10 cm of soil than in the uninvaded mudflat...
June 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28641183/size-partitioning-and-mixing-behavior-of-trace-metals-and-dissolved-organic-matter-in-a-south-china-estuary
#2
Wenhao Wang, Min Chen, Laodong Guo, Wen-Xiong Wang
The Jiulong River estuary, located in the southeastern China, suffered from metal pollution due to industrial effluent releases. Mixing of effluent and estuarine water may have significantly affected the size distribution of trace metals and their environmental fate. In the present study, colloidal size distribution of organic matter and selected metals were quantified using asymmetric flow field-flow fractionation (AF4) and ICP-MS. We demonstrated a dominance of dissolved metals in the 1-10kDa fraction, and metals such as Cu, Zn, Ni, Co, Pb, Cd and Mn were mostly regulated by terrestrial fulvic acid...
June 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28640599/a-high-throughput-dna-sequencing-approach-to-determine-sources-of-fecal-bacteria-in-a-lake-superior-estuary
#3
Clairessa M Brown, Christopher Staley, Ping Wang, Brent Dalzell, Chan Lan Chun, Michael J Sadowsky
Current microbial source tracking (MST) methods, employed to determine sources of fecal contamination in waterways, use molecular markers targeting host-associated bacteria in animal or human feces. However, there is a lack of knowledge about fecal microbiome composition in several animals and imperfect marker specificity and sensitivity. To overcome these issues, a community-based MST method has been developed. Here, we describe a study done in the Lake Superior-St. Louis River estuary using SourceTracker, a program that calculates the source contribution to an environment...
June 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28638675/petroleum-hydrocarbon-fingerprints-of-water-and-sediment-samples-of-buffalo-river-estuary-in-the-eastern-cape-province-south-africa
#4
A O Adeniji, O O Okoh, A I Okoh
Petroleum hydrocarbon status of the Buffalo River Estuary in East London, South Africa, was evaluated from January to May, 2016. Surface water and sediment samples were collected from five points in the estuary and extracted using standard methods. The extracts were subsequently analyzed by gas chromatography-flame ionization detection. Results showed that total petroleum hydrocarbon (TPH) varied from 7.65 to 477 μg/L in the water and 12.59 to 1,100 mg/kg in the sediments, with mean values of 146.50 ± 27...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28634558/plesiomonas-shigelloides-an-unusual-cause-of-septic-abortion
#5
Gilbert Cornut, Xavier Marchand-Senecal, Christiane Gaudreau, Jeremie Berdugo, Gilles Gariepy, Catherine Tremblay, Patrice Savard
Plesiomonas shigelloides, the only oxidase-positive Enterobacteriaceae, is an inhabitant of freshwater and estuary ecosystems. We report the first possible case of Plesiomonas shigelloides-induced septic abortion. This 24-year-old female was successfully treated by dilatation and curettage as well as antimicrobial therapy.
2017: Case Reports in Infectious Diseases
https://www.readbyqxmd.com/read/28634416/new-climatic-targets-against-global-warming-will-the-maximum-2%C3%A2-%C3%A2-c-temperature-rise-affect-estuarine-benthic-communities
#6
Daniel Crespo, Tiago Fernandes Grilo, Joana Baptista, João Pedro Coelho, Ana Isabel Lillebø, Fernanda Cássio, Isabel Fernandes, Cláudia Pascoal, Miguel Ângelo Pardal, Marina Dolbeth
The Paris Agreement signed by 195 countries in 2015 sets out a global action plan to avoid dangerous climate change by limiting global warming to remain below 2 °C. Under that premise, in situ experiments were run to test the effects of 2 °C temperature increase on the benthic communities in a seagrass bed and adjacent bare sediment, from a temperate European estuary. Temperature was artificially increased in situ and diversity and ecosystem functioning components measured after 10 and 30 days. Despite some warmness effects on the analysed components, significant impacts were not verified on macro and microfauna structure, bioturbation or in the fluxes of nutrients...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28633950/a-multi-scale-integrated-modeling-framework-to-measure-comprehensive-impact-of-coastal-reclamation-activities-in-yellow-river-estuary-china
#7
Yan Xu, Yanpeng Cai, Tao Sun, Qian Tan
In this paper, an improved multi-scale integrated modeling framework has been established to evaluate coastal reclamation intensity (CRI). About 7 indicators are considered, including ecological degradation intensity (EDI), hydrodynamic disturbance (IHD), engineering types, water quality, economic investment, population growth, and reclaimed land area. Meanwhile, an integrated framework enhanced methods in terms of (a) measuring intensity of ecological degradation process under multi-scale impact, (b) developing the indicator system of CRI, and discussing the driving forces and trends of coastal reclamation, (c) determining fuzzy preference relations of weight and calculating the specific value of CRI with the case study areas of Yellow River estuary from 2000 to 2015...
June 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28633948/effect-of-nutrient-pollution-on-dinoflagellate-cyst-assemblages-across-estuaries-of-the-nw-atlantic
#8
Andrea M Price, Michael R S Coffin, Vera Pospelova, James S Latimer, Gail L Chmura
We analyzed surface sediments from 23 northeast USA estuaries, from Maine to Delaware, and nine estuaries from Prince Edward Island (PEI, Canada), to determine how dinoflagellate cyst assemblages varied with nutrient loading. Overall the abundance of cysts of heterotrophic dinoflagellates correlates with modeled nitrogen loading, but there were also regional signals. On PEI cysts of Gymnodinium microreticulatum characterized estuaries with high nitrogen loading while the sediments of eutrophic Boston Harbor were characterized by high abundances of Spiniferites spp...
June 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28633946/microplastics-in-gut-contents-of-coastal-freshwater-fish-from-r%C3%A3-o-de-la-plata-estuary
#9
Rocío S Pazos, Tomás Maiztegui, Darío C Colautti, Ariel H Paracampo, Nora Gómez
The presence of microplastics (MPs) in gut contents of coastal freshwater fish of the Rio de la Plata estuary was studied. Samples were taken in six sites where 87 fish belonging to 11 species and four feeding habits were captured. Presence of MPs was verified in the 100% of fish. The fibres represented the 96% of MPs found. The number of MPs in gut contents was significantly higher close to sewage discharge. There was not found relationship between number of MPs and fish length, weight or feeding habit. The spatial differences in mean number of MPs in fish observed in this study, suggest that environmental availability of MPs could be of great importance to explain the differences found among sampling sites analysed...
June 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28631032/occurrence-and-fate-of-organic-and-organometallic-pollutants-in-municipal-wastewater-treatment-plants-and-their-impact-on-receiving-waters-adour-estuary-france
#10
J Cavalheiro, O Zuloaga, A Prieto, H Preudhomme, D Amouroux, M Monperrus
To achieve a "Good Environmental Status by 2015," as demanded by the water framework directive, monitoring programs are needed to furnish data on target compounds. In this study, a first evaluation of influents and main emissions of 3 local wastewater treatment plants (WWTP) in the Adour estuary (southwest of France) was performed for 23 pollutants (10 musk fragrances, 5 alkylphenols, and 8 organometallics), as well as receiving estuarine water from the same area. High frequency of occurrence of these compounds was found in influents samples (musks: 22-100%; alkylphenols 11-100%; organometallics 0-100%) and effluents (musks: 0-100%; alkylphenols 0-100%; organometallics 0-100%)...
June 19, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28628819/dissolved-gaseous-mercury-formation-and-mercury-volatilization-in-intertidal-sediments
#11
Rute Cesário, Laurier Poissant, Martin Pilote, Nelson J O'Driscoll, Ana M Mota, João Canário
Intertidal sediments of Tagus estuary regularly experiences complex redistribution due to tidal forcing, which affects the cycling of mercury (Hg) between sediments and the water column. This study quantifies total mercury (Hg) and methylmercury (MMHg) concentrations and fluxes in a flooded mudflat as well as the effects on water-level fluctuations on the air-surface exchange of mercury. A fast increase in dissolved Hg and MMHg concentrations was observed in overlying water in the first 10min of inundation and corresponded to a decrease in pore waters, suggesting a rapid export of Hg and MMHg from sediments to the water column...
June 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28628817/dynamics-of-dissolved-nutrients-in-the-aquaculture-shrimp-ponds-of-the-min-river-estuary-china-concentrations-fluxes-and-environmental-loads
#12
Ping Yang, Derrick Y F Lai, Baoshi Jin, David Bastviken, Lishan Tan, Chuan Tong
Dissolved inorganic nutrients (NO2(-)-N, NO3(-)-N, NH4(+)-N, and PO4(3-)-P) play a critical role in the effective management of water quality and prevention of fish and shrimp diseases in aquaculture systems. In this study, dissolved inorganic nutrient concentrations in the water column and sediment porewater, and the fluxes across the sediment-water interface (SWI) were investigated in three intensive shrimp ponds with zero water exchange to examine nutrient cycling during the different growth stages of shrimps...
June 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28624637/developing-a-new-bayesian-risk-index-for-risk-evaluation-of-soil-contamination
#13
M T D Albuquerque, S Gerassis, C Sierra, J Taboada, J E Martín, I M H R Antunes, J R Gallego
Industrial and agricultural activities heavily constrain soil quality. Potentially Toxic Elements (PTEs) are a threat to public health and the environment alike. In this regard, the identification of areas that require remediation is crucial. In the herein research a geochemical dataset (230 samples) comprising 14 elements (Cu, Pb, Zn, Ag, Ni, Mn, Fe, As, Cd, V, Cr, Ti, Al and S) was gathered throughout eight different zones distinguished by their main activity, namely, recreational, agriculture/livestock and heavy industry in the Avilés Estuary (North of Spain)...
June 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28622989/rare-earth-elements-mobility-processes-in-an-amd-affected-estuary-huelva-estuary-sw-spain
#14
K L Lecomte, A M Sarmiento, J Borrego, J M Nieto
Huelva Estuary is a transition zone where REE-rich acidic waters interact with saline-alkaline seawater. This mixing process influences the geochemical and mineralogical characteristics of particulate and dissolved fractions. The Tinto River has >11,000μgL(-1) dissolved REE (pH=1.66), whereas seawater only reaches 8.75·10(-2)μgL(-1) dissolved REE (pH=7.87). REE-normalized patterns in "pH<6 solutions" are parallel and show similarities, diminishing their concentration as pH increases. Sequential extraction performed on the generated precipitates of mixed solutions indicates that most REE are associated to the residual phase...
June 13, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28618664/an-epidemiological-approach-to-characterise-the-human-exposure-pathways-in-a-contaminated-estuarine-environment
#15
Ausenda Machado, Ana Paula Fernandes, Eleonora Paixão, Sandra Caeiro, Carlos Matias-Dias
This study's aim was to develop and implement an integrative epidemiologic cross-sectional study that allows identifying and characterising exposure pathways of populations living and working on the shores of a contaminated estuarine environment. Population residing in Carrasqueira, located on the Sado estuary with known contaminated areas was compared to another population on a noncontaminated estuary (Vila Nova de Mil Fontes - VNMF), considered a nonexposed population. Simple random samples of individuals were selected in each study population from the National Health Service Lists: 140 individuals were selected in Carrasqueira and 219 in VNMF...
June 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28617466/damming-the-rivers-of-the-amazon-basin
#16
Edgardo M Latrubesse, Eugenio Y Arima, Thomas Dunne, Edward Park, Victor R Baker, Fernando M d'Horta, Charles Wight, Florian Wittmann, Jansen Zuanon, Paul A Baker, Camila C Ribas, Richard B Norgaard, Naziano Filizola, Atif Ansar, Bent Flyvbjerg, Jose C Stevaux
More than a hundred hydropower dams have already been built in the Amazon basin and numerous proposals for further dam constructions are under consideration. The accumulated negative environmental effects of existing dams and proposed dams, if constructed, will trigger massive hydrophysical and biotic disturbances that will affect the Amazon basin's floodplains, estuary and sediment plume. We introduce a Dam Environmental Vulnerability Index to quantify the current and potential impacts of dams in the basin...
June 14, 2017: Nature
https://www.readbyqxmd.com/read/28615847/larvicidal-potency-of-marine-actinobacteria-isolated-from-mangrove-environment-against-aedes-aegypti-and-anopheles-stephensi
#17
S Balakrishnan, P Santhanam, M Srinivasan
The marine soil samples were collected from different locations of Parangipettai mangrove ecosystem, Vellar estuary, southeast coast of India. Totally 30 different marine actinobacteria were isolated by serial dilution plate technique on starch casein agar medium. The isolated actinobacteria were investigated for their larvicidal activity against Aedes aegypti and Anopheles stephensi mosquitoes. Streptomyces fungicidicus, S. griseus, S. albus, S. alboflavus and S. rochei were identified as potential biocide producers...
June 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28614423/parasitism-by-a-digenea-in-lucina-pectinata-mollusca-lucinidae
#18
M M Ribeiro, J B Oliveira, G Boehs
Lucina pectinata is an important economic resource in the Brazilian coast. This study reports parasitism caused by a Digenea in this species. The specimens (n = 470) were collected in December 2012 in a mangrove swamp of the Cachoeira River estuary, Bahia, Brazil. They were measured along the anterior-posterior axis (length), and after macroscopic analysis for parasites and diseases cuts of 5 mm were fixated in Carnoy's solution and processed by routine histology technique wherein sessions of 7 μm were stained with Harris hematoxylin and eosin (H&E)...
June 12, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28611762/magnetotactic-coccus-strain-shhc-1-affiliated-to-alphaproteobacteria-forms-octahedral-magnetite-magnetosomes
#19
Heng Zhang, Nicolas Menguy, Fuxian Wang, Karim Benzerara, Eric Leroy, Peiyu Liu, Wenqi Liu, Chunli Wang, Yongxin Pan, Zhibao Chen, Jinhua Li
Magnetotactic bacteria (MTB) are morphologically and phylogenetically diverse prokaryotes. They can form intracellular chain-assembled magnetite (Fe3O4) or greigite (Fe3S4) nanocrystals each enveloped by a lipid bilayer membrane called a magnetosome. Magnetotactic cocci have been found to be the most abundant morphotypes of MTB in various aquatic environments. However, knowledge on magnetosome biomineralization within magnetotactic cocci remains elusive due to small number of strains that have been cultured...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28610334/morphological-description-of-early-zoeal-stages-of-alpheus-brasileiro-anker-2012-reared-in-the-laboratory-including-a-revision-of-the-larval-morphology-of-the-first-zoeal-stage-of-the-genus-alpheus-fabricius-1798-caridea-alpheidae
#20
Régis A Pescinelli, João A F Pantaleão, Fernando L Mantelatto, Rogério C Costa
The aims of this study were to describe and illustrate the early larval stages of the snapping shrimp Alpheus brasileiro Anker, 2012 and to review the larval morphology (Zoea I) of the genus Alpheus Fabricius, 1798. Larvae were obtained from two females with embryos collected in an intertidal estuary in Cananéia, São Paulo state, Brazil. The published descriptions of all available Alpheus zoea I (only 14 spp., 4.7%) were used for a comparison of larval morphology. The zoeae I of Alpheus species are very similar, but A...
May 22, 2017: Zootaxa
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