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https://www.readbyqxmd.com/read/29228349/genome-wide-snps-identify-limits-to-connectivity-in-the-extreme-freshwater-disperser-spangled-perch-leiopotherapon-unicolor-terapontidae
#1
Daniel J Schmidt, Joel A Huey, Jane M Hughes
The utility of restriction-site associated DNA sequencing (RADseq) to resolve fine-scale population structure was tested on an abundant and vagile fish species in a tropical river. Australia's most widespread freshwater fish, the "extreme disperser" Leiopotherapon unicolor was sampled from six locations in an unregulated system, the Daly River in Australia's Northern Territory. Despite an expectation of high connectivity based on life history knowledge of this species derived from arid zone habitats, L. unicolor was not a panmictic population in the tropical lower Daly...
November 11, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29228132/vivax-malaria-chemoprophylaxis-the-role-of-atovaquone-proguanil-compared-to-other-options
#2
Meltzer Eyal, Galia Rahav, Schwartz Eli
Background: Atovaquone-Proguanil is considered causal prophylaxis (inhibition of liver-stage schizonts) for Plasmodium falciparum, however, its causal prophylactic efficacy for P. vivax is not known. Travelers returning to non-endemic areas, provide a unique opportunity to study P. vivax prophylaxis. Methods: A retrospective observational study. For 11 years Israeli rafters who had traveled to the Omo River in Ethiopia, a highly malaria endemic area, were followed for at least one year after their return...
December 7, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29227999/ancient-connections-among-the-european-rivers-and-watersheds-revealed-from-the-evolutionary-history-of-the-genus-telestes-actinopterygii-cypriniformes
#3
Ivana Buj, Zoran Marčić, Marko Ćaleta, Radek Šanda, Matthias F Geiger, Jörg Freyhof, Annie Machordom, Jasna Vukić
In order to better understand the complex geologic history of the Mediterranean area, we have analysed evolutionary history, phylogeographic structure and molecular diversity of freshwater fishes belonging to the genus Telestes. As primary freshwater fishes distributed largely in the Mediterranean basin, this genus represents a suitable model system for investigating the historical biogeography of freshwater drainage systems in southern Europe. In this investigation we have included samples representing all Telestes species and based our analyses on one mitochondrial and one nuclear gene...
2017: PloS One
https://www.readbyqxmd.com/read/29227995/restoration-of-floodplain-meadows-effects-on-the-re-establishment-of-mosses
#4
Dorota Michalska-Hejduk, Grzegorz J Wolski, Matthias Harnisch, Annette Otte, Anna Bomanowska, Tobias W Donath
Vascular plants serve as target species for the evaluation of restoration success as they account for most of the plant species diversity and vegetation cover. Although bryophytes contribute considerably to the species diversity of meadows, they are rarely addressed in restoration projects. This project is a first step toward making recommendations for including mosses in alluvial floodplain restoration projects. The opportunity to assess the diversity and ecological requirements of mosses on floodplain meadows presented itself within the framework of a vegetation monitoring that took place in 2014 on meadows located along the northern Upper Rhine...
2017: PloS One
https://www.readbyqxmd.com/read/29227942/the-interaction-between-bacterial-abundance-and-selected-pollutants-concentration-levels-in-an-arctic-catchment-southwest-spitsbergen-svalbard
#5
Klaudia Kosek, Katarzyna Kozak, Krystyna Kozioł, Katarzyna Jankowska, Stanisław Chmiel, Żaneta Polkowska
Persistent organic pollutants (POPs) have been a topic of interest in environmental sciences for >60years. POPs in the Arctic have been investigated since the 1970s, when first atmospheric measurements revealed the presence of these pollutants in the polar regions. Major contaminant transport routes to the Arctic include atmospheric and oceanic transport, as well as inflow from rivers and sea ice. The sources of pollutants, such as industry, power generators, vehicle and ship exhausts, introduce the PAHs, phenols, formaldehyde or metals into the Arctic...
December 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29227018/a-combination-of-dispersive-liquid-liquid-microextraction-and-surface-plasmon-resonance-sensing-of-gold-nanoparticles-for-the-determination-of-ziram-pesticide
#6
Fatemeh Hashemi, Saadat Rastegarzadeh, Nahid Pourreza
A reliable, fast and highly sensitive analytical method utilizing dispersive liquid-liquid microextraction and gold nanoparticles probes was developed for the determination of ziram. The method is based on the in situ formation of gold nanoparticles in carbon tetrachloride as organic phase. It was found that the trace levels of ziram influenced on the formation of gold nanoparticles, leading to an absorbance change of sedimented phase. This results of the colorimetric determination of ziram were in the concentration range of 0...
December 11, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29226959/larvivorous-fish-for-preventing-malaria-transmission
#7
REVIEW
Deirdre P Walshe, Paul Garner, Ahmed A Adeel, Graham H Pyke, Thomas R Burkot
BACKGROUND: Adult female Anopheles mosquitoes can transmit Plasmodium parasites that cause malaria. Some fish species eat mosquito larvae and pupae. In disease control policy documents, the World Health Organization (WHO) includes biological control of malaria vectors by stocking ponds, rivers, and water collections near where people live with larvivorous fish to reduce Plasmodium parasite transmission. In the past, the Global Fund has financed larvivorous fish programmes in some countries, and, with increasing efforts in eradication of malaria, policymakers may return to this option...
December 11, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29226702/extended-spectrum-%C3%AE-lactamase-producing-escherichia-coli-in-wastewaters-and-refugee-camp-in-lebanon
#8
Sima Tokajian, Rima Moghnieh, Tamara Salloum, Harout Arabaghian, Sahar Alousi, Jennifer Moussa, Edmond Abboud, Souad Youssef, Rola Husni
AIM: To evaluate the effects of population influx of refugees on the prevalence of extended-spectrum β-lactamase-producing Escherichia coli in wastewater networks in Lebanon. MATERIALS & METHODS: Pulsed-field gel electrophoresis, multilocus sequence typing and antibiotic resistance genes typing were performed. RESULTS: 53.1% of isolates recovered from Al-Qaa refugee camp were positive for the tested resistant determinants compared with 49...
December 11, 2017: Future Microbiology
https://www.readbyqxmd.com/read/29225612/hidden-diversity-in-the-populations-of-the-armored-catfish-ancistrus-kner-1854-loricariidae-hypostominae-from-the-paran%C3%A3-river-basin-revealed-by-molecular-and-cytogenetic-data
#9
Ana C Prizon, Daniel P Bruschi, Luciana A Borin-Carvalho, Andréa Cius, Ligia M Barbosa, Henrique B Ruiz, Claudio H Zawadzki, Alberto S Fenocchio, Ana L de Brito Portela-Castro
Only one species of armored catfish, Ancistrus cirrhosus Valenciennes 1836, has been historically described in the basin of the Paraná River, from Misiones (Argentina). However, the ample variation found in the morphology and coloration of the populations sampled in the tributaries of the Brazilian state of Paraná makes it difficult to establish the real taxonomic status and evolutionary history of the Ancistrus specimens, suggesting that A. cirrhosus is not the only species found in this basin. By combining data on mitochondrial DNA (COI gene) and chromosomal markers from different Ancistrus populations, totaling 144 specimens, in the tributaries of the Paraná, and specimens from Misiones (type-locality of A...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/29224046/impacts-and-policy-implications-of-metals-effluent-discharges-into-the-industrial-zone-of-rivers-a-sub-saharan-countries-view-ethiopia
#10
E Zinabu, P Kelderman, J van der Kwast, K Irvine
Kombolcha, a city in Ethiopia, exemplifies the challenges and problems of the sub-Saharan countries where industrialization is growing fast but monitoring resources are poor and information on pollution unknown. This study monitored metals Cr, Cu, Zn, and Pb concentrations in five factories' effluents, and in the effluent mixing zones of two rivers receiving discharges during the rainy seasons of 2013 and 2014. The results indicate that median concentrations of Cr in the tannery effluents and Zn in the steel processing effluents were as high as 26,600 and 155,750 µg/L, respectively, much exceeding both the USEPA and Ethiopian emission guidelines...
December 9, 2017: Environmental Management
https://www.readbyqxmd.com/read/29223908/the-role-of-groundwater-discharge-fluxes-on-si-p-ratios-in-a-major-tributary-to-lake-erie
#11
Taylor Maavara, Stephanie Slowinski, Fereidoun Rezanezhad, Kimberly Van Meter, Philippe Van Cappellen
Groundwater discharge can be a major source of nutrients to river systems. Although quantification of groundwater nitrate loading to streams is common, the dependence of surface water silicon (Si) and phosphorus (P) concentrations on groundwater sources has rarely been determined. Additionally, the ability of groundwater discharge to drive surface water Si:P ratios has not been contextualized relative to riverine inputs or in-stream transformations. In this study, we quantify the seasonal dynamics of Si and P cycles in the Grand River (GR) watershed, the largest Canadian watershed draining into Lake Erie, to test our hypothesis that regions of Si-rich groundwater discharge increase surface water Si:P ratios...
December 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29223904/spatiotemporal-variations-of-hydrogeochemistry-and-its-controlling-factors-in-the-gandaki-river-basin-central-himalaya-nepal
#12
Ramesh Raj Pant, Fan Zhang, Faizan Ur Rehman, Guanxing Wang, Ming Ye, Chen Zeng, Handuo Tang
The characterization and assessment of water quality in the head water region of Himalaya is necessary, given the immense importance of this region in sustaining livelihoods of people and maintaining ecological balance. A total of 165 water samples were collected from 55 sites during pre-monsoon, monsoon and post-monsoon seasons in 2016 from the Gandaki River Basin of the Central Himalaya, Nepal. The pH, EC values and TDS concentrations were measured in-situ and the concentrations of major ions (Ca2+, Mg2+, K+, Na+, Cl-, SO42-, NO3-) and Si were analyzed in laboratory...
December 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29223899/nighttime-nox-loss-and-clno2-formation-in-the-residual-layer-of-a-polluted-region-insights-from-field-measurements-and-an-iterative-box-model
#13
Hui Yun, Tao Wang, Weihao Wang, Yee Jun Tham, Qinyi Li, Zhe Wang, Steven C N Poon
The heterogeneous reaction of dinitrogen pentoxide (N2O5) on aerosols is an important sink of nitrogen oxides (NOx) in the polluted boundary layer, and the production of nitryl chloride (ClNO2) can have significant effects on the atmospheric oxidative capacity. However, the heterogeneous loss of N2O5 and the formation of ClNO2 are still not well quantified, especially in China. In a previous study, we measured ClNO2 and N2O5 concentrations in several air masses at a high-elevation site in Hong Kong, and found the highest levels ever reported at one night...
December 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29223897/agricultural-drought-prediction-using-climate-indices-based-on-support-vector-regression-in-xiangjiang-river-basin
#14
Ye Tian, Yue-Ping Xu, Guoqing Wang
Drought can have a substantial impact on the ecosystem and agriculture of the affected region and does harm to local economy. This study aims to analyze the relation between soil moisture and drought and predict agricultural drought in Xiangjiang River basin. The agriculture droughts are presented with the Precipitation-Evapotranspiration Index (SPEI). The Support Vector Regression (SVR) model incorporating climate indices is developed to predict the agricultural droughts. Analysis of climate forcing including El Niño Southern Oscillation and western Pacific subtropical high (WPSH) are carried out to select climate indices...
December 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29223894/a-model-based-fish-bioassessment-index-for-eastern-mediterranean-rivers-application-in-a-biogeographically-diverse-area
#15
S Zogaris, V Tachos, A N Economou, Y Chatzinikolaou, N Koutsikos, S Schmutz
In ecosystems with high fish species endemicity, such as Mediterranean-type rivers, biogeographical differences among ecoregions present serious obstacles to developing broadly-applicable river bioassessment indices. This impediment has contributed to a serious time-lag in developing EU policy-relevant fish-based indices in the Eastern Mediterranean countries. Here we present the first model-based fish index for the Eastern Mediterranean (the Hellenic Fish Index, HeFI) in an effort to overcome biogeographic differences among the area's biotically heterogeneous rivers...
December 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29223293/gradient-measurements-of-gaseous-elemental-mercury-hg0-in-the-marine-boundary-layer-of-the-northwest-sea-of-japan-east-sea
#16
Viktor Kalinchuk, Evgeny Lopatnikov, Anatoly Astakhov
Gaseous elemental mercury (Hg0) is a prolific and persistent contaminant in the atmosphere. Atmospheric concentrations of Hg0 were determined from 17 September to 7 October 2015 in the northwest Sea of Japan aboard the Russian research vessel Professor Gagarinsky. Simultaneous measurements of Hg0 concentrations were performed 2 m and 20 m above the sea surface using automatic Hg0 analysers RA-915M and RA-915+, respectively. Concentrations ranged from 0.3 to 25.9 ng/m3 (n = 5207) and from 0.3 to 27.8 ng/m3 (n = 4415), with medians of 1...
December 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29223121/from-information-to-participation-and-self-organization-visions-for-european-river-basin-management
#17
Johannes Euler, Sonja Heldt
The European Union Water Framework Directive (EU WFD, 2000) calls for active inclusion of the public in the governance of waterbodies to enhance the effectiveness and legitimacy of water management schemes across the EU. As complex socio-ecological systems, river basins in western Europe could benefit from further support for inclusive management schemes. This paper makes use of case studies from Germany, England and Spain to explore the potential opportunities and challenges of different participatory management approaches...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29223089/river-water-infiltration-enhances-denitrification-efficiency-in-riparian-groundwater
#18
Nico Trauth, Andreas Musolff, Kay Knöller, Ute S Kaden, Toralf Keller, Ulrike Werban, Jan H Fleckenstein
Nitrate contamination in ground- and surface water is a persistent problem in countries with intense agriculture. The transition zone between rivers and their riparian aquifers, where river water and groundwater interact, may play an important role in mediating nitrate exports, as it can facilitate intensive denitrification, which permanently removes nitrate from the aquatic system. However, the in-situ factors controlling riparian denitrification are not fully understood, as they are often strongly linked and their effects superimpose each other...
December 1, 2017: Water Research
https://www.readbyqxmd.com/read/29223086/perceived-versus-actual-water-quality-community-studies-in-rural-oaxaca-mexico
#19
Lewis Stetson Rowles, Reinaldo Alcalde, Francisca Bogolasky, Soyoon Kum, Farith A Diaz-Arriaga, Craig Ayres, Anne M Mikelonis, Luis Javier Toledo-Flores, Manuel Gerardo Alonso-Gutiérrez, Maria Eufemia Pérez-Flores, Desmond F Lawler, Peter M Ward, Juana Yolanda Lopez-Cruz, Navid B Saleh
Compromised water quality risks public health, which becomes particularly acute in economically marginalized communities. Although the majority of the clean-water-deprived population resides in Sub-Saharan Africa and Asia, a significant portion (32 million) lives in Meso- and Latin-America. Oaxaca is one of the marginalized southern states of Mexico, which has experienced high morbidity from infectious diseases and also has suffered from a high rate of infant mortality. However, there has been a paucity of reports on the status of water quality of culturally diverse rural Oaxaca...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29223075/mercury-inputs-and-redistribution-in-the-penobscot-river-and-estuary-maine
#20
K M Yeager, K A Schwehr, P Louchouarn, R A Feagin, K J Schindler, P H Santschi
We examined total mercury (Hg) distributions in sediments from the Penobscot River and estuary, Maine, a site of extensive Hg releases from HoltraChem (1967-2000). Our objectives were to quantify: (1) bottom sediment Hg inventories (upper ~1m; 50-100 y); (2) sediment accumulation rates; and (3) contemporary Hg fluxes to bottom sediments; by sampling the Penobscot River (PBR), Mendall Marsh (MM), the Orland River (OR) and the Penobscot estuary (ES). Hg was rapidly distributed here, and the cumulative total (9...
December 6, 2017: Science of the Total Environment
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