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https://www.readbyqxmd.com/read/29352727/re-evaluation-of-target-lipid-model-derived-hc5-predictions-for-hydrocarbons
#1
Joy A McGrath, Christopher J Fanelli, Dominic M Di Toro, Thomas F Parkerton, Aaron D Redman, Miriam Leon Paumen, Mike Comber, Charles V Eadsforth, Klaas den Haan
The Target Lipid Model (TLM) has been previously applied to predict the aquatic toxicity of hydrocarbons and other non-ionic organic chemicals and for deriving HC5 values, concentrations above which 95% of species should be protected. Several concerns were identified with the TLM-derived HC5 when applied in a substance risk assessment context. These shortcomings were addressed by expanding the acute and chronic toxicity databases to include more diverse taxonomic groups and increase the number of species. The TLM was recalibrated with these expanded databases resulting in critical target lipid body burdens and acute-to-chronic ratios that met the required guidelines for using species sensitivity distributions in substance risk assessment...
January 20, 2018: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29352480/temporal-heterogeneity-increases-with-spatial-heterogeneity-in-ecological-communities
#2
Scott L Collins, Meghan L Avolio, Corinna Gries, Lauren M Hallett, Sally E Koerner, Kimberly J La Pierre, Andrew L Rypel, Eric R Sokol, Samuel B Fey, Dan F B Flynn, Sydney K Jones, Laura M Ladwig, Julie Ripplinger, Matt B Jones
Heterogeneity is increasingly recognized as a foundational characteristic of ecological systems. Under global change, understanding temporal community heterogeneity is necessary for predicting the stability of ecosystem functions and services. Indeed, spatial heterogeneity is commonly used in alternative stable state theory as a predictor of temporal heterogeneity and therefore an early indicator of regime shifts. To evaluate whether spatial heterogeneity in species composition is predictive of temporal heterogeneity in ecological communities, we analyzed 68 community datasets spanning freshwater and terrestrial systems where measures of species abundance were replicated over space and time...
January 20, 2018: Ecology
https://www.readbyqxmd.com/read/29352294/seasonal-variation-in-environmental-dna-detection-in-sediment-and-water-samples
#3
Andrew S Buxton, Jim J Groombridge, Richard A Griffiths
The use of aquatic environmental DNA (eDNA) to detect the presence of species depends on the seasonal activity of the species in the sampled habitat. eDNA may persist in sediments for longer than it does in water, and analysing sediment could potentially extend the seasonal window for species assessment. Using the great crested newt as a model, we compare how detection probability changes across the seasons in eDNA samples collected from both pond water and pond sediments. Detection of both aquatic and sedimentary eDNA varied through the year, peaking in the summer (July), with its lowest point in the winter (January): in all seasons, detection probability of eDNA from water exceeded that from sediment...
2018: PloS One
https://www.readbyqxmd.com/read/29351888/distribution-and-availability-of-mercury-and-methylmercury-in-different-waters-from-the-rio-madeira-basin-amazon
#4
Miguel Vieira, José V E Bernardi, José G Dórea, Bruno C P Rocha, Romulo Ribeiro, Luis F Zara
Waters from the Amazon Basin have distinct physicochemical characteristics that can be optically classified as "black", "clear" and "white". We studied the distribution of total-Hg (THg) and methyl-Hg (MeHg) in these waters and respective suspended solids, sediment, phytoplankton, zooplankton, and benthic macroinvertebrates (BM) in the Madeira River Basin. Compared with the other types of water, the more acidic "black" kind had the highest THg and MeHg concentrations. The trend (black > clear > white) occurred for the concentrations of THg and MeHg in sediments and in the biotic compartment (plankton, macroinvertebrates)...
January 16, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29351853/cardiac-biomarkers-as-sensitive-tools-to-evaluate-the-impact-of-xenobiotics-on-amphibians-the-effects-of-anionic-surfactant-linear-alkylbenzene-sulfonate-las
#5
Monica Jones-Costa, Lilian Franco-Belussi, Felipe Augusto Pinto Vidal, Nathália Penteado Gongora, Luciano Mendes Castanho, Cleoni Dos Santos Carvalho, Elaine Cristina Mathias Silva-Zacarin, Fabio Camargo Abdalla, Iolanda Cristina Silveira Duarte, Classius De Oliveira, Cristiane Ronchi de Oliveira, Raquel Fernanda Salla
Amphibian populations have been experiencing a drastic decline worldwide. Aquatic contaminants are among the main factors responsible for this decline, especially in the aquatic environment. The linear alkylbenzene sulfonate (LAS) is of particular concern, since it represents 84% of the anionic surfactants' trade. In Brazil, the maximal LAS concentration allowed in fresh waters is 0.5mgL-1, but its potential harmful effects in amphibians remain unknown. Therefore, this study aimed to analyze the effects of a sublethal concentration of LAS (0...
January 16, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29350430/on-the-impact-of-sample-size-on-lc50-estimation-in-acute-fish-toxicity-testing-is-n%C3%A2-%C3%A2-7-group-enough
#6
Greg J Carr, A John Bailer, Jane M Rawlings, Scott E Belanger
The fish acute toxicity test method is foundational to aquatic toxicity testing strategies, yet the literature lacks a concise sample size assessment. While various sources address sample size, historical precedent seems to play a larger role than objective measures. Here, a novel and comprehensive quantification of the effect of sample size on estimation of the LC50 is presented, covering a wide range of scenarios. The results put into perspective the practical differences across a range of sample sizes, from N = 5/concentration up to N = 23/concentration...
January 19, 2018: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29350309/population-genetics-of-the-endangered-and-wild-edible-plant-ottelia-acuminata-in-southwestern-china-using-novel-ssr-markers
#7
Shu Hua Zhai, Gen Shen Yin, Xiao Hong Yang
Ottelia acuminata is an edible aquatic plant species that is endemic to southwestern China. This plant has experienced habitat degradation resulting from environmental change and extensive human disturbance. Determining the genetic variation and genetic structure of O. acuminata populations could help develop strategies to collect, evaluate, utilize and conserve the species. To this end, we genotyped 183 individuals sampled throughout the species distribution using twelve novel nuclear microsatellite loci (nSSRs)...
January 19, 2018: Biochemical Genetics
https://www.readbyqxmd.com/read/29349911/identification-of-fish-source-vibrio-alginolyticus-and-evaluation-of-its-bacterial-ghosts-vaccine-immune-effects
#8
Ji Cao, Jiajun Zhang, Lin Ma, Lin Li, Wenchang Zhang, Jinnian Li
Vibrio alginolyticus (V. alginolyticus) is a common pathogen for humans and marine aquatic animals. Vibriosis of marine aquatic animals, caused by V. alginolyticus, has become more prevalent globally in recent years. Hence, a safe and effective vaccine is urgently needed for the control of this disease. Here, the strain 16-3 isolated from the large yellow croaker (Larimichthys crocea) suffered from canker was identified as V. alginolyticus based on morphological, biochemical, and 16S rDNA sequencing analysis...
January 19, 2018: MicrobiologyOpen
https://www.readbyqxmd.com/read/29349846/preparation-of-dummy-template-imprinted-polymers-for-the-rapid-extraction-of-non-steroidal-anti-inflammatory-drugs-residues-in-aquatic-environmental-samples
#9
Ping Guo, Jingjing Zhang, Xiaohui Chen, Longshan Zhao
A molecularly imprinted polymer was synthesized and applied as a sorbent in the solid-phase extraction device. The imprinted polymer was characterized by fourier-transform infrared spectroscopy and scanning electron microscope. The results revealed that imprinted polymer possess sensitive selectivity and reliable adsorption properties for five NSAIDs. The imprinted polymer was successfully applied to the pre-concentration for five NSAIDs in different water samples prior to UPLC-MS/MS. In the early studies, several factors were investigated, including pH adjustment, the kind of elution solvent and the volume of elution solvent...
January 19, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29349647/behaviour-of-freshwater-snails-radix-balthica-exposed-to-the-pharmaceutical-sertraline-under-simulated-predation-risk
#10
Melanie Lea Hedgespeth, Tomasz Karasek, Johan Ahlgren, Olof Berglund, Christer Brönmark
Due to their potential for affecting the modulation of behaviour, effects of selective serotonin reuptake inhibitors (SSRIs) in the environment are particularly interesting regarding interspecies interactions and non-consumptive effects (NCEs) induced by predator cues in prey organisms. We evaluated the effects of sertraline (0.4, 40 ng/L, 40 µg/L) over 8 days on activity and habitat choice in the freshwater snail Radix balthica, on snails' boldness in response to mechanical stimulation (simulating predator attack), and their activity/habitat choice in response to chemical cues from predatory fish...
January 18, 2018: Ecotoxicology
https://www.readbyqxmd.com/read/29349499/spatial-coverage-of-mangrove-communities-in-the-arabian-gulf
#11
Hanan Almahasheer
Mangroves are the natural protectors of the coast, carbon sinks, and a nursery to many terrestrial as well as aquatic organisms. Different effects caused by natural forces together with anthropogenic factors have reduced mangrove cover on a global scale, yet little is known about the overall surface covered by mangroves in the Arabian Gulf. Therefore, the aim of this study was to examine their spatial coverage and distribution along the Gulf coastlines, using 25 satellite imagery recently acquired from Landsat 8 data for the year 2017...
January 18, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29346335/notes-from-the-field-legionellosis-outbreak-associated-with-a-hotel-aquatics-facility-tennessee-2017
#12
Jane K Yackley, David Sweat, Mary-Margaret A Fill, Katie Garman, John R Dunn
No abstract text is available yet for this article.
January 19, 2018: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/29346037/development-of-an-ultrasensitive-pcr-assay-for-polycyclic-musk-determination-in-fish
#13
Xiaohan Zhang, Huisheng Zhuang
Polycyclic musks (PCMs) in the aquatic environment and organisms have become an emerging environmental issue because of their potential risk. The most used method for polycyclic musk determination is gas chromatography-mass spectrometry (GC-MS) with different sample extractions, which are somewhat expensive to operate, complex and laborious. In this study, a novel and ultrasensitive real-time polymerase chain reaction (PCR) assay with multiple signal amplification of carboxylic-DNA by gold nanoparticle-polyamidoamine conjugation (Au-PAMAM) was developed for determining polycyclic musks in fish...
January 18, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29345465/microplastic-abundance-and-composition-in-western-lake-superior-as-determined-via-microscopy-pyr-gc-ms-and-ftir
#14
Erik Hendrickson, Elizabeth C Minor, Kathryn Schreiner
While plastic pollution in marine and freshwater systems is an active area of research, there is not yet an in-depth understanding of the distributions, chemical compositions, and fates of plastics in aquatic environments. In this study, the magnitude, distribution, and common polymers of microplastic pollution in surface waters in western Lake Superior are determined. Analytical methodology, including estimates of ambient contamination during sample collection and processing, are described and employed. Microscopy, Pyrolysis-Gas Chromatography/Mass spectrometry (Pyr-GC/MS), and Fourier Transform Infrared spectroscopy (FTIR) were used to quantify and identify microplastic particles...
January 18, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29345091/the-responses-of-microbial-temperature-relationships-to-seasonal-change-and-winter-warming-in-a-temperate-grassland-soil
#15
Johanna Birgander, Pål Axel Olsson, Johannes Rousk
Microorganisms dominate the decomposition of organic matter and their activities are strongly influenced by temperature. As the carbon (C) flux from soil to the atmosphere due to microbial activity is substantial, understanding temperature relationships of microbial processes is critical. It has been shown that microbial temperature relationships in soil correlate with the climate, and microorganisms in field experiments become more warm-tolerant in response to chronic warming. It is also known that microbial temperature relationships reflect the seasons in aquatic ecosystems, but to date this has not been investigated in soil...
January 18, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29343600/rapid-phenotypic-evolution-following-shifts-in-life-cycle-complexity
#16
Ronald M Bonett, John G Phillips, Nicholus M Ledbetter, Samuel D Martin, Luke Lehman
Life cycle strategies have evolved extensively throughout the history of metazoans. The expression of disparate life stages within a single ontogeny can present conflicts to trait evolution, and therefore may have played a major role in shaping metazoan forms. However, few studies have examined the consequences of adding or subtracting life stages on patterns of trait evolution. By analysing trait evolution in a clade of closely related salamander lineages we show that shifts in the number of life cycle stages are associated with rapid phenotypic evolution...
January 31, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29343279/spatial-distribution-and-habitat-characterization-of-mosquito-species-during-the-dry-season-along-the-mara-river-and-its-tributaries-in-kenya-and-tanzania
#17
Gabriel O Dida, Douglas N Anyona, Paul O Abuom, Daniel Akoko, Samson O Adoka, Ally-Said Matano, Philip O Owuor, Collins Ouma
BACKGROUND: Vector-borne diseases are increasingly becoming a major health problem among communities living along the major rivers of Africa. Although larger water bodies such as lakes and dams have been extensively researched, rivers and their tributaries have largely been ignored. This study sought to establish the spatial distribution of mosquito species during the dry season and further characterize their habitats along the Mara River and its tributaries. METHODS: In this cross-sectional survey, mosquito larvae were sampled along the Mara River, its two perennial tributaries (Amala and Nyangores), drying streams, and adjacent aquatic habitats (e...
January 18, 2018: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/29342167/effects-of-ammonium-based-ionic-liquids-and-2-4-dichlorophenol-on-the-phospholipid-fatty-acid-composition-of-zebrafish-embryos
#18
Aleksandra Piotrowska, Anna Syguda, Bogdan Wyrwas, Lukasz Chrzanowski, Till Luckenbach, Hermann J Heipieper
Ionic liquids consisting of a combination of herbicidal anions with a quaternary ammonium cation act as efficient herbicides, which are under consideration to be used in the agriculture. In the present study, we used embryos of the zebrafish (Danio rerio) as a model to assess the toxic potential of ammonium-based ionic liquids for aquatic organisms. As we assumed interference of the partially hydrophobic ionic liquid cation with lipids, we investigated the adaptation response in the lipid composition of the zebrafish embryos, triggered by the ionic compound...
2018: PloS One
https://www.readbyqxmd.com/read/29341250/protectiveness-of-copper-water-quality-criteria-against-impairment-of-behavior-and-chemo-mechanosensory-responses-an-update
#19
REVIEW
Joseph S Meyer, David K DeForest
A meta-analysis was conducted of studies that reported behavior and chemo/mechanosensory responses by fish, amphibians, and aquatic invertebrates in Cu-containing waters and also reported sufficient water chemistry for calculation of hardness-based and biotic ligand model (BLM)-based water quality criteria (WQC) for Cu. The calculated WQC concentrations were then compared to the corresponding 20% impairment concentrations (IC20) of Cu for those behavior and chemo/mechanosensory responses. The hardness-based acute and chronic WQC for Cu would not have been protective (i...
January 17, 2018: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29340248/depth-and-range-dependent-variation-in-the-performance-of-aquatic-telemetry-systems-understanding-and-predicting-the-susceptibility-of-acoustic-tag-receiver-pairs-to-close-proximity-detection-interference
#20
Stephen R Scherrer, Brendan P Rideout, Giacomo Giorli, Eva-Marie Nosal, Kevin C Weng
Background: Passive acoustic telemetry using coded transmitter tags and stationary receivers is a popular method for tracking movements of aquatic animals. Understanding the performance of these systems is important in array design and in analysis. Close proximity detection interference (CPDI) is a condition where receivers fail to reliably detect tag transmissions. CPDI generally occurs when the tag and receiver are near one another in acoustically reverberant settings. Here we confirm transmission multipaths reflected off the environment arriving at a receiver with sufficient delay relative to the direct signal cause CPDI...
2018: PeerJ
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