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https://www.readbyqxmd.com/read/28107748/tracing-the-sources-and-cycling-of-phosphorus-in-river-sediments-using-oxygen-isotopes-methodological-adaptations-and-first-results-from-a-case-study-in-france
#1
Chiara Pistocchi, Federica Tamburini, Gerard Gruau, André Ferhi, Dominique Trevisan, Jean-Marcel Dorioz
An essential aspect of eutrophication studies is to trace the ultimate origin of phosphate ions (P-PO4) associated with the solid phase of river sediments, as certain processes can make these ions available for algae. However, this is not a straightforward task because of the diversity of allochthonous and autochthonous sources that can supply P-PO4 to river sediments as well as the existence of in-stream processes that can change the speciation of these inputs and obscure the original sources. Here, we present the results of a study designed to explore the potentials, limitations and conditions for the use of the oxygen isotope composition of phosphate (δ(18)Op) extracted from river sediments for this type of tracing...
December 26, 2016: Water Research
https://www.readbyqxmd.com/read/28107716/occurrence-speciation-and-transportation-of-heavy-metals-in-9-coastal-rivers-from-watershed-of-laizhou-bay-china
#2
Li Xu, Tieyu Wang, Jihua Wang, Anxiang Lu
The occurrence, speciation and transport of heavy metals in 9 coastal rivers from watershed of Laizhou Bay were investigated. The largest dissolved concentrations of Cd, Cu and Zn in water were 6.26, 2755.00, 2076.00 μg/L, respectively, much higher than several drinking water guidelines. The greatest concentrations of Cu, Zn, Cr, Ni, Pb and Cd in sediments were 1462, 1602, 196, 67.2, 63.5 and 1.41 mg/kg, dw, respectively. Correlation and principal component analysis was also conducted to determine the extent between the concentrations of metals in water and sediment, as well as relevant parameters...
January 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28106290/returning-to-normal-assessing-transcriptome-recovery-over-time-in-male-rainbow-darter-etheostoma-caeruleum-liver-in-response-to-wastewater-treatment-plant-upgrades
#3
Patricija Marjan, Christopher J Martyniuk, Meghan L M Fuzzen, Deborah L MacLatchy, Mark E McMaster, Mark R Servos
The present study measured hepatic transcriptome responses in male rainbow darter (Etheostoma caeruleum) exposed to 2 municipal wastewater treatment plants (MWWTPs) (Kitchener and Waterloo) over 4 fall seasons (2011 - 2014) in the Grand River Ontario. The overall goal was to determine if upgrades at the Kitchener MWWTP (in 2012) resulted in transcriptome responses indicative of improved effluent quality. The number of differentially expressed probes in fish downstream of the Kitchener outfall (904-1,223), remained comparable to that downstream of Waterloo (767-3,867)...
January 20, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28106048/simulating-the-hydrologic-cycle-in-coal-mining-subsidence-areas-with-a-distributed-hydrologic-model
#4
Jianhua Wang, Chuiyu Lu, Qingyan Sun, Weihua Xiao, Guoliang Cao, Hui Li, Lingjia Yan, Bo Zhang
Large-scale ground subsidence caused by coal mining and subsequent water-filling leads to serious environmental problems and economic losses, especially in plains with a high phreatic water level. Clarifying the hydrologic cycle in subsidence areas has important practical value for environmental remediation, and provides a scientific basis for water resource development and utilisation of the subsidence areas. Here we present a simulation approach to describe interactions between subsidence area water (SW) and several hydrologic factors from the River-Subsidence-Groundwater Model (RSGM), which is developed based on the distributed hydrologic model...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28105739/validation-of-daily-increment-deposition-and-early-growth-of-mud-carp-cirrhinus-molitorella
#5
Y Huang, F Chen, W Tang, Z Lai, X Li
In this study, laboratory reared Cirrhinus molitorella from hatching through to the juvenile stage were used to validate daily increment deposition. Lapilli were suitable for ageing C. molitorella. The slope of the linear relationships between increment counts and age was not significantly different from 1 (n = 258, P > 0·05), indicating that growth increments are deposited daily. The first increment following the first-feeding check formed 3 days post hatch (dph). One hundred and twenty-three juveniles, ranging from 36·4 to 84·7 mm in body length (LB ), were collected in the Pear River estuary from July to January in both 2014 and 2015 and used to estimate growth rate...
January 20, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28105680/are-hybrids-between-atlantic-salmon-and-brown-trout-suitable-long-term-hosts-of-gyrodactylus-salaris-during-winter
#6
R Knudsen, E H Henriksen, K Ø Gjelland, H Hansen, D K Hendrichsen, R Kristoffersen, K Olstad
The monogenean parasite Gyrodactylus salaris poses serious threats to many Atlantic salmon populations and presents many conservation and management questions/foci and challenges. It is therefore critical to identify potential vectors for infection. To test whether hybrids of native Atlantic salmon (Salmo salar) × brown trout (Salmo trutta) are suitable as reservoir hosts for G. salaris during winter, infected hybrid parr were released into a natural subarctic brook in the autumn. Six months later, 23.9% of the pit-tagged fish were recaptured...
January 20, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28105594/screening-of-inorganic-and-organic-contaminants-in-floodwater-in-paddy-fields-of-hue-and-thanh-hoa-in-vietnam
#7
Ha Thu Trinh, Helle Marcussen, Hans Christian B Hansen, Giang Truong Le, Hanh Thi Duong, Nguyen Thuy Ta, Trung Quang Nguyen, Soren Hansen, Bjarne W Strobel
In the rainy season, rice growing areas in Vietnam often become flooded by up to 1.5 m water. The floodwater brings contaminants from cultivated areas, farms and villages to the rice fields resulting in widespread contamination. In 2012 and 2013, the inorganic and organic contaminants in floodwater was investigated in Thanh Hoa and Hue. Water samples were taken at 16 locations in canals, paddy fields and rivers before and during the flood. In total, 940 organic micro-pollutants in the water samples were determined simultaneously by GC-MS method with automatic identification and quantification system (AIQS), while ICP-MS was used for determination of ten trace elements in the samples...
January 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28105564/occurrence-and-fate-of-pesticides-in-the-argentine-stretch-of-the-paraguay-paran%C3%A3-basin
#8
M A Etchegoyen, A E Ronco, P Almada, M Abelando, D J Marino
The Argentine stretch of the del Plata basin crosses regions devoted to extensive and intensive agriculture mostly with chemical pest control. The utilization of pesticides in the region has increased 900% in the last two decades associated with the introduction of biotech crops and direct-seeding techniques. Our objective was to study the occurrence, concentration, and fate of pesticides in surface water and bottom sediments of the principal tributaries and main watercourse of the Paraguay-Paraná River. We sampled 22 sites in the distal positions of the main affluents and main watercourse of the Paraná and report here results from two monitoring campaigns (2010-2012)...
February 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28104553/temperature-response-of-sulfide-ferrous-oxidation-and-microbial-community-in-anoxic-sediments-treated-with-calcium-nitrate-addition
#9
Zihao He, Xinxian Long, Luyao Li, Guangwei Yu, Yunxiao Chong, Wen Xing, Ziao Zhu
Nitrate-driven sulfide oxidation has been proved a cost-effective way to control sediments odor which has long been a universal problem for urban rivers in south China areas. In this work, sediments treatment experiments under a dynamic variation of temperature from 5 °C to 35 °C with 3% of calcium nitrate added were conducted to reveal the influence of temperature variation on this process. The results showed that microbial community was remarkably restructured by temperature variation. Pseudomonas (15...
January 16, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28104341/water-level-fluctuations-influence-sediment-porewater-chemistry-and-methylmercury-production-in-a-flood-control-reservoir
#10
Chris S Eckley, Todd P Luxton, Jennifer Goetz, John McKernan
Reservoirs typically have elevated fish mercury (Hg) levels compared to natural lakes and rivers. A unique feature of reservoirs is water-level management which can result in sediment exposure to the air. The objective of this study is to identify how reservoir water-level fluctuations impact Hg cycling, particularly the formation of the more toxic and bioaccumulative methylmercury (MeHg). Total-Hg (THg), MeHg, stable isotope methylation rates and several ancillary parameters were measured in reservoir sediments (including some in porewater and overlying water) that are seasonally and permanently inundated...
January 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28103955/mosquitoes-diptera-culicidae-in-mauritania-a-review-of-their-biodiversity-distribution-and-medical-importance
#11
REVIEW
Aichetou Mint Mohamed Lemine, Mohamed Aly Ould Lemrabott, Moina Hasni Ebou, Khadijetou Mint Lekweiry, Mohamed Salem Ould Ahmedou Salem, Khyarhoum Ould Brahim, Mohamed Ouldabdallahi Moukah, Issa Nabiyoullahi Ould Bouraya, Cecile Brengues, Jean-François Trape, Leonardo Basco, Hervé Bogreau, Frédéric Simard, Ousmane Faye, Ali Ould Mohamed Salem Boukhary
Although mosquitoes (Diptera: Culicidae) are important disease vectors, information on their biodiversity in Mauritania is scarce and very dispersed in the literature. Data from the scientific literature gathered in the country from 1948 to 2016 were collected and analyzed. Overall 51 culicid species comprising 17 Anopheles spp., 14 Aedes spp., 18 Culex spp. and two Mansonia spp. have been described in Mauritania among which Anopheles arabiensis, Aedes vexans, Culex poicilipes and Culex antennatus are of epidemiological significance...
January 19, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28103408/functional-planning-units-for-the-management-of-an-endangered-brazilian-titi-monkey
#12
Sidney F Gouveia, João Pedro Souza-Alves, Bruno B de Souza, Raone Beltrão-Mendes, Leandro Jerusalinsky, Stephen F Ferrari
Conservation practices in the tropics often rely on the data available for a few, better-known species and the adoption of an appropriate spatial scale. By defining a set of landscape units that account for critical aspects of the focal species, the information available on these conservation targets can support regional conservation policies. Here, we define and classify adjacent landscapes, termed planning units, to orientate management decisions within and among these landscapes, which are occupied by an endangered flagship primate species (Coimbra-Filho's titi monkey, Callicebus coimbrai) from eastern Brazil...
January 19, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28102440/thyroid-hormones-retinol-and-clinical-parameters-in-relation-to-mercury-and-organohalogen-contaminants-in-great-blue-heron-ardea-herodias-nestlings-from-the-st-lawrence-river-qu%C3%A3-bec-canada
#13
Louise Champoux, Monique Boily, Guy Fitzgerald
The exposure and effects of persistent environmental contaminants were investigated in great blue heron (Ardea herodias) nestlings sampled in 2001, 2002, 2006, and 2007 in freshwater and estuarine heronries along the St. Lawrence River, Québec (Canada). Biomarkers (retinoids, thyroid hormones, and clinical parameters) and contaminants (organochlorine contaminants, polychlorinated biphenyls (PCBs), brominated flame retardants (BFRs), and mercury (Hg)) were analyzed in blood, and Hg was analyzed in feathers (generally 9 nestlings per colony and 4 colonies per year)...
January 19, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28102073/estimates-of-health-impacts-and-radiative-forcing-in-winter-haze-in-eastern-china-through-constraints-of-surface-pm2-5-predictions
#14
Meng Gao, Pablo E Saide, Jinyuan Xin, Yuesi Wang, Zirui Liu, Yuxuan Wang, Zifa Wang, Mariusz Pagowski, Sarath K Guttikunda, Gregory R Carmichael
The Gridpoint Statistical Interpolation (GSI) Three-Dimensional Variational (3DVAR) data assimilation system is extended to treat the MOSAIC aerosol model in WRF-Chem, and to be capable of assimilating surface PM2.5 concentrations. The coupled GSI-WRF-Chem system is applied to reproduce aerosol levels over China during an extremely polluted winter month, January 2013. After assimilating surface PM2.5 concentrations, the correlation coefficients between observations and model results averaged over the assimilated sites are improved from 0...
January 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28102008/gender-associated-mitochondrial-dna-heteroplasmy-in-somatic-tissues-of-the-endangered-freshwater-mussel-unio-crassus-bivalvia-unionidae-implications-for-sex-identification-and-phylogeographical-studies
#15
Monika Mioduchowska, Agnieszka Kaczmarczyk, Katarzyna Zając, Tadeusz Zając, Jerzy Sell
Some bivalve species possess two independent mitochondrial DNA lineages: maternally (F-type) and paternally (M-type) inherited. This phenomenon is called doubly uniparental inheritance. It is generally agreed that F-type mtDNA is typically present in female somatic and gonadal tissues as well as in male somatic tissues, whereas the M-type mtDNA occurs only in male germ line and gonadal tissue. In the present study, the mtDNA heteroplasmy (for both F and M genomes) in male somatic tissues of Unio crassus (Philipsson, 1788), species threatened with extinction, has been confirmed...
November 2016: Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology
https://www.readbyqxmd.com/read/28101957/summer-co-existence-of-small-sized-cyprinid-and-percid-individuals-in-natural-and-impounded-stretches-of-a-lowland-river-food-niche-partitioning-among-fishes
#16
J Lik, M Dukowska, M Grzybkowska, J Leszczyńska
Due to changes of discharge regime downstream of a dam reservoir, an alluvial natural stretch of the Warta River changed to a macrophyte-dominated ecosystem. Large patches of submersed, aquatic macrophytes appeared in summer and their effect is analysed in this study. These patches contained enriched macroinvertebrate assemblages (epiphyton and benthos) and they were refuge for both zooplankton and young fishes released from the reservoir. Despite these altered conditions in this stretch, roach Rutilus rutilus, perch Perca fluviatilis and ruffe Gymnocephalus cernua dominated, as they did in the natural backwater...
January 18, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28101707/distributions-and-ecological-risk-assessment-of-estrogens-and-bisphenol-a-in-an-arid-and-semiarid-area-in-northwest-china
#17
Xiaowei Liu, Jianghong Shi, Ting Bo, Yaobin Meng, Xinmin Zhan, Mengtao Zhang, Yang Zhang
Free estrogens (estrone, E1; 17β-estradiol, 17β-E2; estriol, E3; and 17α-ethinylestradiol, EE2), their corresponding sulfate and glucuronide conjugates, and bisphenol A (BPA) were investigated in water and sediments in the Fen River catchment, an arid and semiarid area in northwest China. E1 and BPA were frequently detected in the wet and dry sampling seasons. In addition to the sulfate conjugates, other conjugated estrogens were not detected in water and sediments. The concentrations of these compounds in water generally increased from upstream to downstream...
January 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28101588/factors-controlling-sediment-load-in-the-central-anatolia-region-of-turkey-ankara-river-basin
#18
Umit Duru, Ellen Wohl, Mehdi Ahmadi
Better understanding of the factors controlling sediment load at a catchment scale can facilitate estimation of soil erosion and sediment transport rates. The research summarized here enhances understanding of correlations between potential control variables on suspended sediment loads. The Soil and Water Assessment Tool was used to simulate flow and sediment at the Ankara River basin. Multivariable regression analysis and principal component analysis were then performed between sediment load and controlling variables...
January 18, 2017: Environmental Management
https://www.readbyqxmd.com/read/28100417/long-range-and-regional-transported-size-resolved-atmospheric-aerosols-during-summertime-in-urban-shanghai
#19
Xiaoxiao Ding, Lingdong Kong, Chengtian Du, Assiya Zhanzakova, Lin Wang, Hongbo Fu, Jianmin Chen, Xin Yang, Tiantao Cheng
In this study, the concentrations of water soluble ions (WSI), organic carbon (OC), and elemental carbon (EC) of size-resolved (0.056-18μm) atmospheric aerosols were measured in July and August 2015 in Shanghai, China. Backward trajectory model and potential source contribution function (PSCF) model were used to identify the potential source distributions of size-resolved particles and PM1.8-associated atmospheric inorganic and carbonaceous aerosols. The results showed that the average mass concentrations of PM0...
January 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28100309/nioella-sediminis-sp-nov-isolated-from-the-surface-sediment-and-emended-description-of-the-genus-nioella
#20
Yang Liu, Juan Du, Qiliang Lai, Chunming Dong, Zongze Shao
A bacterial strain, designated JS7-11T, was isolated from the surface sediment of the Jiulong River and characterized using a polyphasic taxonomic approach. Cells of strain JS7-11T was Gram-staining-negative, non-motile and short-rod-shaped. Growth was observed at 10-40°C (optimum 25-30°C), at pH 6-8 (optimum 7) and in 1-12% NaCl (optimum 3-4%, w/v). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain JS7-11T and type strain Nioella nitratireducens SSW136T formed an independent cluster, sharing 97...
January 18, 2017: International Journal of Systematic and Evolutionary Microbiology
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