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https://www.readbyqxmd.com/read/28724108/yellow-perch-perca-flavescens-mercury-unaffected-by-wildland-fires-in-northern-minnesota
#1
Charlotte E Riggs, Randall K Kolka, Edward A Nater, Emma L Witt, Trent R Wickman, Laurel G Woodruff, Jason T Butcher
Wildland fire can alter mercury (Hg) cycling on land and in adjacent aquatic environments. In addition to enhancing local atmospheric Hg redeposition, fire can influence terrestrial movement of Hg and other elements into lakes via runoff from burned upland soil. However, the impact of fire on water quality and the accumulation of Hg in fish remain equivocal. We investigated the effects of fire-specifically, a low-severity prescribed fire and moderate-severity wildfire-on young-of-the-year yellow perch () and lake chemistry in a small remote watershed in the Boundary Waters Canoe Area Wilderness in northeastern Minnesota...
May 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28721503/salinity-drives-the-virioplankton-abundance-but-not-production-in-tropical-coastal-lagoons
#2
Pedro C Junger, André M Amado, Rodolfo Paranhos, Anderson S Cabral, Saulo M S Jacques, Vinicius F Farjalla
Viruses are the most abundant components of microbial food webs and play important ecological and biogeochemical roles in aquatic ecosystems. Virioplankton is regulated by several environmental factors, such as salinity, turbidity, and humic substances. However, most of the studies aimed to investigate virioplankton regulation were conducted in temperate systems combining a limited range of environmental variables. In this study, virus abundance and production were determined and their relation to bacterial and limnological variables was assessed in 20 neighboring shallow tropical coastal lagoons that present wide environmental gradients of turbidity (2...
July 18, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28720755/functional-variants-of-the-melanocortin-4-receptor-associated-with-the-odontoceti-and-mysticeti-suborders-of-cetaceans
#3
Liyuan Zhao, Xiaofan Zhou, Antonis Rokas, Roger D Cone
Cetaceans, a group of mammals adapted to the aquatic environment that descended from terrestrial artiodactyls, exhibit tremendous interspecific differences in a number of phenotypes, including feeding behavior, such as filter feeding in the Mysticeti vs prey-hunting Odontoceti, and size, with the smallest cetacean, the vaquita, at 1.4 meters and the largest, the blue whale, reaching 33 meters. The Melanocortin-4 receptor (MC4R) regulates food intake, energy balance, and somatic growth in both mammals and teleosts...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28717012/intracellular-metabolic-pathway-distribution-in-diatoms-and-tools-for-genome-enabled-experimental-diatom-research
#4
REVIEW
Ansgar Gruber, Peter G Kroth
Diatoms are important primary producers in the oceans and can also dominate other aquatic habitats. One reason for the success of this phylogenetically relatively young group of unicellular organisms could be the impressive redundancy and diversity of metabolic isoenzymes in diatoms. This redundancy is a result of the evolutionary origin of diatom plastids by a eukaryote-eukaryote endosymbiosis, a process that implies temporary redundancy of functionally complete eukaryotic genomes. During the establishment of the plastids, this redundancy was partially reduced via gene losses, and was partially retained via gene transfer to the nucleus of the respective host cell...
September 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28715772/stability-of-single-dispersed-silver-nanoparticles-in-natural-and-synthetic-freshwaters-effects-of-dissolved-oxygen
#5
Xiaoyan Zou, Penghui Li, Jie Lou, Xiaoyan Fu, Hongwu Zhang
Silver nanoparticles (AgNPs) are increasingly used in various commercial products. This increased use raises ecological concerns because of the large release of AgNPs into the environment. Once released, the local water chemistry has the potential to influence the environmental fates and behaviors of AgNPs. The impacts of dissolved oxygen and natural organic matter (NOM) on the dissolution and stability of AgNPs were investigated in synthetic and natural freshwaters for 7 days. In synthetic freshwater, the aggregation of AgNPs occurred due to the compression of the electric double layer, accompanied by the dissolution of AgNPs...
July 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28712030/predictive-modelling-of-eutrophication-in-the-poz%C3%A3-n-de-la-dolores-lake-northern-spain-by-using-an-evolutionary-support-vector-machines-approach
#6
P J García-Nieto, E García-Gonzalo, J R Alonso Fernández, C Díaz Muñiz
Eutrophication is a water enrichment in nutrients (mainly phosphorus) that generally leads to symptomatic changes and deterioration of water quality and all its uses in general, when the production of algae and other aquatic vegetations are increased. In this sense, eutrophication has caused a variety of impacts, such as high levels of Chlorophyll a (Chl-a). Consequently, anticipate its presence is a matter of importance to prevent future risks. The aim of this study was to obtain a predictive model able to perform an early detection of the eutrophication in water bodies such as lakes...
July 15, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/28711771/toxicity-of-organic-compounds-from-unresolved-complex-mixtures-ucms-to-primary-fish-hepatocytes
#7
Karina Petersen, Maria T Hultman, Steven J Rowland, Knut Erik Tollefsen
Many environmental matrices contaminated with organic pollutants derived from crude oil or degraded petroleum contain mixtures so complex that they are typically unresolved by conventional analytical techniques such as gas chromatography. The resulting chromatographic features have become known as 'humps' or unresolved complex mixtures (UCMs). These UCMs often dominate the organic contaminants of polluted environmental samples: for example, in oil sands produced water up to 150mgL(-1) of 'naphthenic acids' appear as UCMs when examined by gas chromatography as the esters...
June 29, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28711770/multigenerational-effects-evaluation-of-the-flame-retardant-tris-2-butoxyethyl-phosphate-tboep-using-daphnia-magna
#8
Maeva Giraudo, Maxime Dubé, Mélanie Lépine, Pierre Gagnon, Mélanie Douville, Magali Houde
Tris(2-butoxyethyl) phosphate (TBOEP) is an organophosphate ester used as substitute following the phase-out of brominated flamed retardants. Because of its high production volume and its use in a broad range of applications, this chemical is now frequently detected in the environment and biota. However, limited information is available on the long-term effects of TBOEP in aquatic organisms. In this study, Daphnia magna were exposed over three 21d generations to an environmentally relevant concentration of TBOEP (10μg/L) and effects were evaluated at the gene transcription, protein, and life-history (i...
July 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28711003/environmentally-relevant-concentrations-of-herbicides-impact-non-target-species-at-multiple-sublethal-endpoints
#9
Simone Hasenbein, Jade Peralta, Sharon P Lawler, Richard E Connon
There is concern over herbicide exposure effects on aquatic primary production and zooplankton as herbicides are found in aquatic ecosystems at concentrations potentially toxic to phytoplankton. We first aimed to determine the effect concentrations (growth inhibition) and mixture interactions of the herbicides diuron (0.5 to 50μg/L) and hexazinone (0.5 to 40μg/L) on the green algae Pseudokirchneriella subcapitata. Secondly, we evaluated chronic effects on Daphnia magna that were periodically fed on P. subcapitata that had been exposed to low, medium, and high concentrations...
July 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28710269/molecular-mechanism-and-genetic-determinants-of-buprofezin-degradation
#10
Xueting Chen, Junbin Ji, Leizhen Zhao, Jiguo Qiu, Chen Dai, Weiwu Wang, Jian He, Jiandong Jiang, Qing Hong, Xin Yan
Buprofezin is a widely used insect growth regulator whose residue has been frequently detected in the environment, posing a threat to aquatic organisms and non-target insects. Microorganisms play an important role in the degradation of buprofezin in the natural environment. However, the relevant catabolic pathway has not been fully characterized, and the molecular mechanism of catabolism is still completely unknown. Rhodococcus qingshengii YL-1 can utilize buprofezin as a sole source of carbon and energy for growth...
July 14, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28708270/transcriptional-and-cellular-effects-of-benzotriazole-uv-stabilizers-uv-234-and-uv-328-in-the-freshwater-invertebrates-chlamydomonas-reinhardtii-and-daphnia-magna
#11
Maeva Giraudo, Guillaume Cottin, Marta Esperanza, Pierre Gagnon, Amila O De Silva, Magali Houde
Benzotriazole UV-stabilizers (BZT-UVs) are compounds used in many applications and products to prevent photochemical degradation. Despite their widespread presence in aquatic ecosystems and persistence in the environment, there are very limited data on their effects and toxicity, and their modes of action remain largely unknown. The objectives of this study were to evaluate the chronic effects of two BZT-UVs, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (UV-234) and 2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol (UV-328), on the freshwater green algae Chlamydomonas reinhardtii and the freshwater crustacean Daphnia magna...
July 14, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28707658/-phototrophic-microorganisms-in-the-symbiotic-communities-of-baikal-sponges-diversity-of-psba-gene-encoding-d1-protein-of-photosystem-ii-sequences
#12
O V Kaluzhnaya, V B Itskovich
The psbA gene, which encodes a major photosystem II protein (protein II or D1), is a marker for the presence of phototrophic organisms in water communities. We have pioneered the use of this marker for studying the diversity of phototrophic microflora of freshwater invertebrates. The object of the study is the microbial associations accompanying the endemic Baikal sponge Baikalospongia intermedia and the surrounding aquatic microbial community. Analysis of the psbA gene sequences in the examined microbiomes demonstrates the presence of various phototrophic groups, such as Cyanobacteria, Chlorophyta, Heterokonta, Haptophyta, and Ochrophyta algae, as well as cyanophages...
May 2017: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/28707260/historical-effects-of-dissolved-organic-carbon-export-and-land-management-decisions-on-the-watershed-scale-forest-carbon-budget-of-a-coastal-british-columbia-douglas-fir-dominated-landscape
#13
B P Smiley, J A Trofymow
BACKGROUND: To address how natural disturbance, forest harvest, and deforestation from reservoir creation affect landscape-level carbon (C) budgets, a retrospective C budget for the 8500 ha Sooke Lake Watershed (SLW) from 1911 to 2012 was developed using historical spatial inventory and disturbance data. To simulate forest C dynamics, data was input into a spatially-explicit version of the Carbon Budget Model-Canadian Forest Sector (CBM-CFS3). Transfers of terrestrial C to inland aquatic environments need to be considered to better capture the watershed scale C balance...
December 2017: Carbon Balance and Management
https://www.readbyqxmd.com/read/28707254/effect-of-oil-palm-on-the-plecoptera-and-trichoptera-insecta-assemblages-in-streams-of-eastern-amazon
#14
Carina Kaory Sasahara de Paiva, Ana Paula Justino de Faria, Lenize Batista Calvão, Leandro Juen
The production of oil palm is expected to increase in the Amazon region. However, expansion of oil palm plantation leads to significant changes in the physical structure of aquatic ecosystems, mainly through the reduction of riparian vegetation that is essential for aquatic biodiversity. Here, we evaluated the effects of oil palm on the physical habitat structure of Amazonian stream environments and assemblages of Plecoptera and Trichoptera (PT), ​both found in these streams. We compared streams sampled in oil palm plantations (n = 13) with natural forest areas ("reference" streams, n = 8), located in the eastern Amazon, Brazil...
August 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28707236/historical-record-of-nutrients-inputs-into-the-xin-an-reservoir-and-its-potential-environmental-implication
#15
Xiaobin Jia, Wenyun Luo, Xueqian Wu, Haobin Wei, Baoli Wang, Waiwai Phyoe, Fushun Wang
The Xin'an Reservoir is an important water supply source and water conservation area for the Qiantang River. However, after the occurrence of the two algae blooms in 1998 and 1999, the safety of water quality has been put into question. In order to study the historical deposition of nutrients, sediment cores were collected in different regions from the Xin'an Reservoir. The stable isotopes δ(13)C and δ(15)N, nutrients, total organic carbon (TOC), and inorganic carbon (IC) in the sediment cores were determined...
July 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28705413/seawater-temperature-and-uv-radiation-interaction-modifies-oxygen-consumption-digestive-process-and-growth-of-an-intertidal-fish
#16
M Roberto García-Huidobro, Marcela Aldana, Cristian Duarte, Cristóbal Galbán-Malagón, José Pulgar
UV-radiation (UVR) and temperatures have increased substantially over recent decades in many regions of the world. Both stressors independently have shown to affect the metabolism and growth in fish. However, because increase of both stressors are occurring concomitantly, to better understand their influences on marine species, their combined effects were evaluated. We test the hypothesis that UVR and temperature act synergistically affecting the metabolism, digestive process and growth of an intertidal fish...
June 20, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28704774/corrosion-protection-products-as-a-source-of-bisphenol-a-and-toxicity-to-the-aquatic-environment
#17
Etiënne L M Vermeirssen, Conrad Dietschweiler, Inge Werner, Michael Burkhardt
Steel components are typically treated with anti-corrosion coatings like epoxy or polyurethane resins to protect the integrity and functioning of steel. Such resins may contain substances, such as bisphenol A (BPA), that have caused concern in a human and environmental toxicological context. We investigated the release of toxicity from four anti-corrosion coatings used in hydraulic and civil engineering. Resins were applied onto glass plates and leachate samples produced by horizontally shaking the plates in water for 7 days...
July 3, 2017: Water Research
https://www.readbyqxmd.com/read/28702797/purification-and-antibacterial-mechanism-of-fish-borne-bacteriocin-and-its-application-in-shrimp-penaeus-vannamei-for-inhibiting-vibrio-parahaemolyticus
#18
Xinran Lv, Jingfang Du, Yu Jie, Bolin Zhang, Fengling Bai, Hongfei Zhao, Jianrong Li
Vibrio parahaemolyticus: is recognized as the main cause of gastroenteritis associated with consumption of seafood. Bacteriocin-producing Lactobacillus plantarum FGC-12 isolated from golden carp intestine had strong antibacterial activity toward V. parahaemolyticus. The fish-borne bacteriocin was purified by a three-step procedure consisting of ethyl acetate extraction, gel filtration chromatography and high performance liquid chromatography. Its molecular weight was estimated at 4.1 kDa using SDS-PAGE. The fish-borne bacteriocin reached the maximum production at stationary phase after 20 h...
August 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28699726/in-vitro-digestibility-study-of-some-plant-protein-sources-as-aquafeed-for-carps-labeo-rohita-and-cyprinus-carpio-using-ph-stat-method
#19
Jai Gopal Sharma, Ashok Kumar, Deepak Saini, Nawang Lendup Targay, Bronson Kumar Khangembam, Rina Chakrabarti
Aquaculture, as a promising food industry, is expected to meet the demand for quality food from the increasing human population. As the diet is critical for feeding farm fish, such a faster growth in the industry is destined to create stress in the fishmeal market to supply diets to the tune. In this context, here, we studied the protein content of 20 plant ingredients, including aquatic weeds, cereals, pulses and oil-cakes using micro-Kjeldahl method and evaluated in vitro digestibility of these ingredients for rohu Labeo rohita and common carp Cyprinus carpio using pH-Stat method...
September 2016: Indian Journal of Experimental Biology
https://www.readbyqxmd.com/read/28699344/watershed-scale-impacts-from-surface-water-disposal-of-oil-and-gas-wastewater-in-western-pennsylvania
#20
William D Burgos, Luis Castillo-Meza, Travis L Tasker, Thomas J Geeza, Patrick J Drohan, Xiaofeng Liu, Joshua D Landis, Jens Blotevogel, Molly McLaughlin, Thomas Borch, Nathaniel R Warner
Combining horizontal drilling with high volume hydraulic fracturing has increased extraction of hydrocarbons from low-permeability oil and gas (O&G) formations across the United States; accompanied by increased wastewater production. Surface water discharges of O&G wastewater by centralized waste treatment (CWT) plants pose risks to aquatic and human health. We evaluated the impact of surface water disposal of O&G wastewater from CWT plants upstream of the Conemaugh River Lake (dam controlled reservoir) in western Pennsylvania...
July 12, 2017: Environmental Science & Technology
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