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https://www.readbyqxmd.com/read/28226279/roles-of-steady-state-and-dynamic-models-for-regulation-of-hydrophobic-chemicals-in-aquatic-systems-a-case-study-of-decamethylcyclopentasiloxane-d5-and-pcb-180-in-three-diverse-ecosystems
#1
Jaeshin Kim, Donald Mackay, David E Powell
We seek to contribute to the improved regulatory use of mass balance models to complement environmental monitoring data by applying the steady-state Quantitative Water Air Sediment Interactive model (QWASI) and a novel unsteady-state QWASI model. A steady-state model can yield not only a useful simulation of chemical fate under near steady-state conditions, but it can provide insights into the likely influences of increasing or decreasing emission rates, temperature changes, and unexpectedly high sensitivities to model parameters that may require additional investigation...
February 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28226262/an-urban-runoff-model-designed-to-inform-stormwater-management-decisions
#2
Nicole G Beck, Gary Conley, Lisa Kanner, Margaret Mathias
We present an urban runoff model designed for stormwater managers to quantify runoff reduction benefits of mitigation actions that has lower input data and user expertise requirements than most commonly used models. The stormwater tool to estimate load reductions (TELR) employs a semi-distributed approach, where landscape characteristics and process representation are spatially-lumped within urban catchments on the order of 100 acres (40 ha). Hydrologic computations use a set of metrics that describe a 30-year rainfall distribution, combined with well-tested algorithms for rainfall-runoff transformation and routing to generate average annual runoff estimates for each catchment...
February 19, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28225951/comparative-microscopic-analysis-of-nail-clippings-from-patients-with-cutaneous-psoriasis-and-psoriatic-arthritis
#3
Gabriela Poglia Fonseca, Betina Werner, Gabriela Seidel, Henrique Luiz Staub
BACKGROUND: The nail involvement in psoriasis is related to psoriatic arthritis and may represent a predictor of the disease. OBJECTIVES: To analyze, through nail clipping, clinically normal and dystrophic nails of patients with cutaneous psoriasis and psoriatic arthritis. METHODS: This is a cross-sectional multicenter study, conducted between August 2011 and March 2012. Patients were divided into four groups: patients with cutaneous psoriasis and onychodystrophy, patients with cutaneous psoriasis and clinically normal nails, patients with psoriatic arthritis and onychodystrophy and patients with psoriatic arthritis and clinically normal nails...
January 2017: Anais Brasileiros de Dermatologia
https://www.readbyqxmd.com/read/28225817/binational-climate-change-vulnerability-assessment-of-migratory-birds-in-the-great-lakes-basins-tools-and-impediments
#4
Robert S Rempel, Megan L Hornseth
Climate change is a global concern, requiring international strategies to reduce emissions, however, climate change vulnerability assessments are often local in scope with assessment areas restricted to jurisdictional boundaries. In our study we explored tools and impediments to understanding and responding to the effects of climate change on vulnerability of migratory birds from a binational perspective. We apply and assess the utility of a Climate Change Vulnerability Index on 3 focal species using distribution or niche modeling frameworks...
2017: PloS One
https://www.readbyqxmd.com/read/28225812/correction-genetic-diversity-of-the-critically-endangered-lake-minnow-eupallasella-percnurus-in-poland-and-its-implications-for-conservation
#5
Dariusz Kaczmarczyk, Jacek Wolnicki
[This corrects the article DOI: 10.1371/journal.pone.0168191.].
2017: PloS One
https://www.readbyqxmd.com/read/28225301/book-reviewlifting-the-impenetrable-veil-from-yellow-fever-to-ebola-hemorrhagic-fever-and-sars-charles-h-calisher-rock-pile-press-red-feather-lakes-colorado-2013-540-pp-isbn-13-978-0-615-82773-5-35-00
#6
https://www.readbyqxmd.com/read/28222978/toxicity-of-platinum-palladium-and-rhodium-to-daphnia-magna-in-single-and-binary-metal-exposure-experiments
#7
Sonja Zimmermann, Carolina Wolff, Bernd Sures
Mainly due to automobile traffic, but also due to other sources, the platinum group elements (PGE) platinum (Pt), palladium (Pd) and rhodium (Rh) are introduced into aquatic biotopes where they accumulate in sediments of lakes and rivers. However, the toxicity of these noble metals to aquatic organisms is not well understood and especially toxicity studies under standardized condition are lacking. Thus, the toxicity of Pt, Pd and Rh to Daphnia magna was tested in single metal exposure experiments according to OECD guideline 202...
February 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28220835/effects-of-abiotic-factors-on-ecosystem-health-of-taihu-lake-china-based-on-eco-exergy-theory
#8
Ce Wang, Jun Bi, Brian D Fath
A lake ecosystem is continuously exposed to environmental stressors with non-linear interrelationships between abiotic factors and aquatic organisms. Ecosystem health depicts the capacity of system to respond to external perturbations and still maintain structure and function. In this study, we explored the effects of abiotic factors on ecosystem health of Taihu Lake in 2013, China from a system-level perspective. Spatiotemporal heterogeneities of eco-exergy and specific eco-exergy served as thermodynamic indicators to represent ecosystem health in the lake...
February 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28220526/balloon-valvuloplasty-of-tricuspid-stenosis-a-retrospective-study-of-5-labrador-retriever-dogs
#9
G A Lake-Bakaar, L G Griffiths, M D Kittleson
BACKGROUND: There are limited reports of severe tricuspid valve stenosis in dogs and limited data regarding treatment and outcome. OBJECTIVE: To evaluate clinical signs, echocardiographic features, and outcome of balloon valvuloplasty (BV) in dogs with severe tricuspid valve stenosis (TVS) in which BV was attempted. ANIMALS: Five client-owned dogs with severe TVS. METHODS: Records were retrospectively reviewed and data collected regarding signalment, clinical signs, diagnostic findings, procedures, and outcome...
February 21, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/28220301/evidence-that-higher-co2-increases-tree-growth-sensitivity-to-temperature-a-comparison-of-modern-and-paleo-oaks
#10
Steven L Voelker, Michael C Stambaugh, J Renée Brooks, Frederick C Meinzer, Barbara Lachenbruch, Richard P Guyette
To test tree growth sensitivity to temperature under different ambient CO2 concentrations, we determined stem radial growth rates as they relate to variation in temperature during the last deglacial period, and compare these to modern tree growth rates as they relate to spatial variation in temperature across the modern species distributional range. Paleo oaks were sampled from Northern Missouri, USA and compared to a pollen-based, high-resolution paleo temperature reconstruction from Northern Illinois, USA...
February 20, 2017: Oecologia
https://www.readbyqxmd.com/read/28219780/diversification-of-mitochondrial-genome-of-daphnia-galeata-cladocera-crustacea-comparison-with-phylogenetic-consideration-of-the-complete-sequences-of-clones-isolated-from-five-lakes-in-japan
#11
Shin-Ichi Tokishita, Hiroyuki Shibuya, Taku Kobayashi, Masaki Sakamoto, Jin-Yong Ha, Shin-Ichi Yokobori, Hideo Yamagata, Takayuki Hanazato
To characterize genetic diversity and gene flow among Daphnia galeata populations, the complete nucleotide (nt) sequences of the mitochondrial (mt) DNAs of D. galeata clones isolated from five lakes in Japan (Lakes Shirakaba, Suwa, Kizaki, Kasumigaura, and Biwa) were determined. Comparison of non-synonymous (amino acid altering) substitution rates with synonymous substitution rates of D. galeata mt protein-coding genes demonstrated that ATPase8 and COI genes were the most and least susceptible, respectively, to the evolutional forces selecting the aa substitutions...
February 17, 2017: Gene
https://www.readbyqxmd.com/read/28217926/reduction-oxidation-cycles-of-organic-matter-increase-bacterial-activity-in-the-pelagic-oxycline
#12
Maximilian P Lau, Michael Hupfer, Hans Peter Grossart
Dissolved organic matter (DOM) in aquatic ecosystems contains redox-active moieties, which are prone to oxidation and reduction reactions. Oxidized moieties feature reduction potentials Eh , so that the moieties may be used as terminal electron acceptors (TEAs) in microbial respiration with a thermodynamic energy yield between nitrate and sulfate reduction. Here, we study the response of pelagic freshwater bacteria to exposure to native DOM with varying availabilities of oxidized moieties and hence redox state...
February 20, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28217912/cold-adaptation-of-the-antarctic-haloarchaea-halohasta-litchfieldiae-and-halorubrum-lacusprofundi
#13
Timothy J Williams, Yan Liao, Jun Ye, Rhiannon P Kuchel, Anne Poljak, Mark J Raftery, Ricardo Cavicchioli
Halohasta litchfieldiae represents ∼ 44% and Halorubrum lacusprofundi ∼ 10% of the hypersaline, perennially cold (≥ -20°C) Deep Lake community in Antarctica. We used proteomics and microscopy to define physiological responses of these haloarchaea to growth at high (30°C) and low (10 and 4°C) temperatures. The proteomic data indicate that both species responded to low temperature by modifying their cell envelope including protein N-glycosylation, maintaining osmotic balance and translation initiation, and modifying RNA turnover and tRNA modification...
February 20, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28217745/the-baltic-sea-virome-diversity-and-transcriptional-activity-of-dna-and-rna-viruses
#14
Lisa Zeigler Allen, John P McCrow, Karolina Ininbergs, Christopher L Dupont, Jonathan H Badger, Jeffery M Hoffman, Martin Ekman, Andrew E Allen, Birgitta Bergman, J Craig Venter
Metagenomic and metatranscriptomic data were generated from size-fractionated samples from 11 sites within the Baltic Sea and adjacent marine waters of Kattegat and freshwater Lake Torneträsk in order to investigate the diversity, distribution, and transcriptional activity of virioplankton. Such a transect, spanning a salinity gradient from freshwater to the open sea, facilitated a broad genome-enabled investigation of natural as well as impacted aspects of Baltic Sea viral communities. Taxonomic signatures representative of phages within the widely distributed order Caudovirales were identified with enrichments in lesser-known families such as Podoviridae and Siphoviridae...
January 2017: MSystems
https://www.readbyqxmd.com/read/28217121/seasonal-variation-in-abundance-and-diversity-of-bacterial-methanotrophs-in-five-temperate-lakes
#15
Md Sainur Samad, Stefan Bertilsson
Lakes are significant sources of methane (CH4) to the atmosphere. Within these systems, methanotrophs consume CH4 and act as a potential biofilter mitigating the emission of this potent greenhouse gas. However, it is still not well understood how spatial and temporal variation in environmental parameters influence the abundance, diversity, and community structure of methanotrophs in lakes. To address this gap in knowledge, we collected water samples from three depths (surface, middle, and bottom) representing oxic to suboxic or anoxic zones of five different Swedish lakes in winter (ice-covered) and summer...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28216369/role-of-socio-cultural-and-economic-factors-in-cyprinid-fish-distribution-networks-and-consumption-in-lawa-lake-region-northeast-thailand-novel-perspectives-on-opisthorchis-viverrini-transmission-dynamics
#16
Christina Sunyoung Kim, John F Smith, Apiporn Suwannatrai, Pierre Echaubard, Bruce Wilcox, Sasithorn Kaewkes, Paiboon Sithithaworn, Banchob Sripa
Opisthorchis viverrini (Ov) is a fish-borne parasite endemic in parts of Lao PDR, Cambodia, southern Vietnam and Northeast Thailand (Isaan) where an estimated 10 million people are infected. Human Ov infection, associated with hepatobiliary complications, including cholangiocarcinoma (CCA), occurs when infected fish are consumed raw or undercooked, a longstanding cultural tradition in the region. This mixed- methods descriptive study was carried out in Isaan villages around Lawa Lake, Khon Kaen Province, known for their Ov endemicity...
February 16, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28215813/a-comparative-approach-using-biomarkers-in-feral-and-caged-neotropical-fish-implications-for-biomonitoring-freshwater-ecosystems-in-agricultural-areas
#17
Carlos Eduardo Delfino Vieira, Patrícia Gomes Costa, Liziara Costa Cabrera, Ednei Gilberto Primel, Gilberto Fillmann, Adalto Bianchini, Claudia Bueno Dos Reis Martinez
The aim of this study was to investigate the responses of biomarkers in feral and caged fish and the capacity of these biomarkers to discriminate contamination levels along a stream located in an agricultural area in Southern Brazil. Specimens of the Neotropical fish, Astyanax altiparanae, were confined for 168h in three lakes along the stream. Additionally, during the weeks of in situ exposure, wild specimens of this species were collected from the same sites. Biochemical biomarkers were analyzed, such as phase I biotransformation enzyme 7-ethoxyresorufin-O-deethylase (EROD) and phase II biotransformation enzyme glutathione S-transferase, and we also determined hepatic and branchial levels of non-protein thiols (NPSH), oxidative damage such as lipid peroxidation (LPO), and acetylcholinesterase (AChE) activity in muscle and brain...
February 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28215078/contribution-of-leaf-litter-to-nutrient-export-during-winter-months-in-an-urban-residential-watershed
#18
Anika Rose Bratt, Jacques C Finlay, Sarah E Hobbie, Benjamin D Janke, Adam C Worm, Kathrine L Kemmitt
Identification of non-point sources of nitrogen (N) and phosphorus (P) in urban systems is imperative to improve water quality and better manage eutrophication. Winter contributions and sources of annual N and P loads from urban watersheds are poorly characterized in northern cities because monitoring is often limited to warm weather periods. To determine winter export of N and P, we monitored storm water outflow in a residential watershed in Saint Paul, Minnesota during 2012-2014. Our data demonstrate that winter melt events contribute a high percentage of annual N and P export (50%)...
February 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28214749/impairment-in-the-mesohippocampal-dopamine-circuit-following-exposure-to-the-brominated-flame-retardant-hbcdd
#19
Camille Pham-Lake, Elizabeth B Aronoff, Chad R Camp, Aimee Vester, Sam J Peters, W Michael Caudle
Many chemicals have been used to increase the safety of consumer products by reducing their flammability and risk for ignition. Recent focus on brominated flame retardants, such as polybrominated diphenyl ethers (PBDEs) has shown them to contribute to neurobehavioral deficits in children, including learning and memory. As the manufacture and use of PBDEs have been reduced, replacement chemicals, such as hexabromocyclododecane (HBCDD) have been substituted. Our current study evaluated the neurotoxicity of HBCDD, concentrating on dopaminergic innervation to the hippocampus...
February 4, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28214116/response-of-fish-communities-to-multiple-pressures-development-of-a-total-anthropogenic-pressure-intensity-index
#20
Sandra Poikane, David Ritterbusch, Christine Argillier, Witold Białokoz, Petr Blabolil, Jan Breine, Nicolaas G Jaarsma, Teet Krause, Jan Kubečka, Torben L Lauridsen, Peeter Nõges, Graeme Peirson, Tomas Virbickas
Lakes in Europe are subject to multiple anthropogenic pressures, such as eutrophication, habitat degradation and introduction of alien species, which are frequently inter-related. Therefore, effective assessment methods addressing multiple pressures are needed. In addition, these systems have to be harmonised (i.e. intercalibrated) to achieve common management objectives across Europe. Assessments of fish communities inform environmental policies on ecological conditions integrating the impacts of multiple pressures...
February 14, 2017: Science of the Total Environment
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