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https://www.readbyqxmd.com/read/28432508/estimation-of-environmental-flow-incorporating-water-quality-and-hypothetical-climate-change-scenarios
#1
Bendangtola Walling, Shushobhit Chaudhary, C T Dhanya, Arun Kumar
Environmental flows (Eflow, hereafter) are the flows to be maintained in the river for its healthy functioning and the sustenance and protection of aquatic ecosystems. Estimation of Eflow in any river stretch demands consideration of various factors such as flow regime, ecosystem, and health of river. However, most of the Eflow estimation studies have neglected the water quality factor. This study urges the need to consider water quality criterion in the estimation of Eflow and proposes a framework for estimating Eflow incorporating water quality variations under present and hypothetical future scenarios of climate change and pollution load...
May 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28431347/improving-water-quality-in-china-environmental-investment-pays-dividends
#2
Yongqiang Zhou, Jianrong Ma, Yunlin Zhang, Boqiang Qin, Erik Jeppesen, Kun Shi, Justin D Brookes, Robert G M Spencer, Guangwei Zhu, Guang Gao
This study highlights how Chinese economic development detrimentally impacted water quality in recent decades and how this has been improved by enormous investment in environmental remediation funded by the Chinese government. To our knowledge, this study is the first to describe the variability of surface water quality in inland waters in China, the affecting drivers behind the changes, and how the government-financed conservation actions have impacted water quality. Water quality was found to be poorest in the North and the Northeast China Plain where there is greater coverage of developed land (cities + cropland), a higher gross domestic product (GDP), and higher population density...
April 14, 2017: Water Research
https://www.readbyqxmd.com/read/28431314/effect-of-metals-on-microcystin-abundance-and-environmental-fate
#3
Guofei Dai, Ningyan Peng, Jiayou Zhong, Ping Yang, Binchun Zou, Hui Chen, Qian Lou, Yuanyuan Fang, Wei Zhang
Metals can react with microcystin (MC), which is released from cyanobacterial blooms through various mechanisms; these reactions may mitigate the environmental and health risks of MCs but may also cause harm to aquatic ecosystems and humans. Several studies were conducted, including laboratory tests, ecological simulations, and a field investigation of Poyang Lake. The laboratory studies showed that Fe(3+), Cu(2+), and Pb(2+) stimulated MC photodegradation under high light intensity at the water-sediment interface, which reduced the MC accumulation in the sediment...
April 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28429584/dna-metabarcoding-of-unfractionated-water-samples-relates-phyto-zoo-and-bacterioplankton-dynamics-and-reveals-a-single-taxon-bacterial-bloom
#4
Christian Wurzbacher, Katrin Attermeyer, Marie Therese Kettner, Clara Flintrop, Norman Warthmann, Sabine Hilt, Hans-Peter Grossart, Michael T Monaghan
Most studies of aquatic plankton focus on either macroscopic or microbial communities, and on either eukaryotes or prokaryotes. This separation is primarily for methodological reasons, but can overlook potential interactions among groups. We tested whether DNA metabarcoding of unfractionated water samples with universal primers could be used to qualitatively and quantitatively study the temporal dynamics of the total plankton community in a shallow temperate lake. We found significant changes in the relative proportions of normalized sequence reads of eukaryotic and prokaryotic plankton communities over a three-month period in spring...
April 21, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28429538/finding-a-partner-in-the-ocean-molecular-and-evolutionary-bases-of-the-response-to-sexual-cues-in-a-planktonic-diatom
#5
Swaraj Basu, Shrikant Patil, Daniel Mapleson, Monia Teresa Russo, Laura Vitale, Cristina Fevola, Florian Maumus, Raffaella Casotti, Thomas Mock, Mario Caccamo, Marina Montresor, Remo Sanges, Maria Immacolata Ferrante
Microalgae play a major role as primary producers in aquatic ecosystems. Cell signalling regulates their interactions with the environment and other organisms, yet this process in phytoplankton is poorly defined. Using the marine planktonic diatom Pseudo-nitzschia multistriata, we investigated the cell response to cues released during sexual reproduction, an event that demands strong regulatory mechanisms and impacts on population dynamics. We sequenced the genome of P. multistriata and performed phylogenomic and transcriptomic analyses, which allowed the definition of gene gains and losses, horizontal gene transfers, conservation and evolutionary rate of sex-related genes...
April 21, 2017: New Phytologist
https://www.readbyqxmd.com/read/28429526/sll1783-a-monooxygenase-associated-with-polysaccharide-processing-in-the-unicellular-cyanobacterium-synechocystis-pcc-6803
#6
Hélder Miranda, Peter Immerzeel, Lorenz Gerber, Katarina Hörnaeus, Sara Bergström Lind, Bagmi Pattanaik, Pia Lindberg, Fikret Mamedov, Peter Lindblad
Cyanobacteria play a pivotal role as the primary producer in many aquatic ecosystems. The knowledge on the interacting processes of cyanobacteria with its environment - abiotic and biotic factors - is still very limited. Many potential exocytoplasmic proteins in the model unicellular cyanobacterium Synechocystis PCC 6803 have unknown functions and their study is essential to improve our understanding of this photosynthetic organism and its potential for biotechnology use. Here we characterize a deletion mutant of Synechocystis PCC 6803, ∆sll1783, a strain that showed a remarkably high light resistance which is related with its lower thylakoid membrane formation...
April 21, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28429320/euglena-gracilis-genome-and-transcriptome-organelles-nuclear-genome-assembly-strategies-and-initial-features
#7
ThankGod Echezona Ebenezer, Mark Carrington, Michael Lebert, Steven Kelly, Mark C Field
Euglena gracilis is a major component of the aquatic ecosystem and together with closely related species, is ubiquitous worldwide. Euglenoids are an important group of protists, possessing a secondarily acquired plastid and are relatives to the Kinetoplastidae, which themselves have global impact as disease agents. To understand the biology of E. gracilis, as well as to provide further insight into the evolution and origins of the Kinetoplastidae, we embarked on sequencing the nuclear genome; the plastid and mitochondrial genomes are already in the public domain...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28428852/stoichiometric-traits-of-stickleback-effects-of-genetic-background-rearing-environment-and-ontogeny
#8
Miguel Costa Leal, Rebecca J Best, Dan Durston, Rana W El-Sabaawi, Blake Matthews
Phenotypes can both evolve in response to, and affect, ecosystem change, but few examples of diverging ecosystem-effect traits have been investigated. Bony armor traits of fish are good candidates for this because they evolve rapidly in some freshwater fish populations, and bone is phosphorus rich and likely to affect nutrient recycling in aquatic ecosystems. Here, we explore how ontogeny, rearing environment, and bone allocation among body parts affect the stoichiometric phenotype (i.e., stoichiometric composition of bodies and excretion) of threespine stickleback...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28426422/morphological-re-description-of-electrotaenia-malapteruri-cestoda-proteocephalidae-and-dujardinnascaris-malapteruri-nematoda-heterocheilidae-infecting-the-electric-catfish-malapterurus-electricus-and-heavy-metal-accumulation-in-host-and-parasites-in-relation
#9
Rewaida Abdel-Gaber, Fathy Abdel-Ghaffar, Mohamed Abdallah Shazly, Kareem Morsy, Saleh Al Quraishy, Sanna Mohamed, Heinz Mehlhorn
Parasites are one of the most serious limiting factors in aquaculture. The Electric catfish Malapterurus electricus was subjected to study the prevalence and mean intensity of parasitic infections throughout the whole year of 2015. Heavy metals accumulation in host fish and parasites were determined in relation to water quality and sediments of two different sites of Lake Manzala (Manzala and Bahr El-Baqar), Egypt. A total of 100 specimens of Electric catfish were collected and examined for the presence of helminth parasites...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28423029/evaluating-dispersal-potential-of-an-invasive-fish-by-the-use-of-aerobic-scope-and-osmoregulation-capacity
#10
Jane W Behrens, Mikael van Deurs, Emil A F Christensen
Non-indigenous species (NIS) can impact marine biodiversity and ecosystem structure and function. Once introduced into a new region, secondary dispersal is limited by the physiology of the organism in relation to the ambient environment and by complex interactions between a suite of ecological factors such as presence of predators, competitors, and parasites. Early prediction of dispersal potential and future 'area of impact' is challenging, but also a great asset in taking appropriate management actions. Aerobic scope (AS) in fish has been linked to various fitness-related parameters, and may be valuable in determining dispersal potential of aquatic invasive species in novel environments...
2017: PloS One
https://www.readbyqxmd.com/read/28422988/rainfall-changes-affect-the-algae-dominance-in-tank-bromeliad-ecosystems
#11
Aliny Patricia Flauzino Pires, Juliana da Silva Leal, Edwin T H M Peeters
Climate change and biodiversity loss have been reported as major disturbances in the biosphere which can trigger changes in the structure and functioning of natural ecosystems. Nonetheless, empirical studies demonstrating how both factors interact to affect shifts in aquatic ecosystems are still unexplored. Here, we experimentally test how changes in rainfall distribution and litter diversity affect the occurrence of the algae-dominated condition in tank bromeliad ecosystems. Tank bromeliads are miniature aquatic ecosystems shaped by the rainwater and allochthonous detritus accumulated in the bases of their leaves...
2017: PloS One
https://www.readbyqxmd.com/read/28421326/nutrient-enrichment-in-water-more-than-in-leaves-affects-aquatic-microbial-litter-processing
#12
Cristiane Biasi, Manuel A S Graça, Sandro Santos, Verónica Ferreira
Nutrient enrichment of soils and water will intensify in the future and has the potential to alter fundamental ecosystem processes, such as litter decomposition. We tested the direct (via water nutrient enrichment) and indirect (via changes in leaf chemistry) effects of nutrient enrichment on microbial activity and decomposability of Quercus robur L. (oak) leaves in laboratory microcosms simulating streams. Senescent leaves of oak trees grown without and with fertilization were incubated under ambient and elevated water nutrient [nitrogen (N) and phosphorus (P)] concentrations for 60 days...
April 18, 2017: Oecologia
https://www.readbyqxmd.com/read/28421268/using-a-population-model-to-inform-the-management-of-river-flows-and-invasive-carp-cyprinus-carpio
#13
John D Koehn, Charles R Todd, Brenton P Zampatti, Ivor G Stuart, Anthony Conallin, Leigh Thwaites, Qifeng Ye
Carp are a highly successful invasive fish species, now widespread, abundant and considered a pest in south-eastern Australia. To date, most management effort has been directed at reducing abundances of adult fish, with little consideration of population growth through reproduction. Environmental water allocations are now an important option for the rehabilitation of aquatic ecosystems, particularly in the Murray-Darling Basin. As carp respond to flows, there is concern that environmental watering may cause floodplain inundation and provide access to spawning habitats subsequently causing unwanted population increase...
April 18, 2017: Environmental Management
https://www.readbyqxmd.com/read/28419950/river-bottom-sediment-from-the-vistula-as-matrix-of-candidate-for-a-new-reference-material
#14
Anna Kiełbasa, Bogusław Buszewski
Bottom sediments are very important in aquatic ecosystems. The sediments accumulate heavy metals and compounds belonging to the group of persistent organic pollutants. The accelerated solvent extraction (ASE) was used for extraction of 16 compounds from PAH group from bottom sediment of Vistula. For the matrix of candidate of a new reference material, moisture content, particle size, loss on ignition, pH, and total organic carbon were determined. A gas chromatograph with a selective mass detector (GC/MS) was used for the final analysis...
April 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28418159/toxicity-of-sediment-associated-substituted-phenylamine-antioxidants-on-the-early-life-stages-of-pimephales-promelas-and-a-characterization-of-effects-on-freshwater-organisms
#15
Ryan S Prosser, Joanne L Parrott, Melissa Galicia, Kallie Shires, Cheryl Sullivan, John Toito, Adrienne J Bartlett, Danielle Milani, Patty L Gillis, Vimal K Balakrishnan
Substituted phenylamine antioxidants (SPAs) are high production volume chemicals that are incorporated into a variety of commercial products (e.g., polymers, dyes, lubricants). There are little data on chronic toxicity of SPAs to fish and no data on the toxicity of SPAs to the early-life stages of fish. The physicochemical properties of SPAs would suggest that if they were to enter an aquatic ecosystem they would partition into sediment. Therefore, the current study focused on investigating the chronic effect of sediment-associated SPAs to the early-life stages of the fathead minnow (Pimephales promelas)...
April 18, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28417327/influence-of-land-use-and-land-cover-on-the-spatial-variability-of-dissolved-organic-matter-in-multiple-aquatic-environments
#16
Shatrughan Singh, Padmanava Dash, Saurav Silwal, Gary Feng, Ardeshir Adeli, Robert J Moorhead
Water quality of lakes, estuaries, and coastal areas serves as an indicator of the overall health of aquatic ecosystems as well as the health of the terrestrial ecosystem that drains to the water body. Land use and land cover plays not only a significant role in controlling the quantity of the exported dissolved organic matter (DOM) but also influences the quality of DOM via various biogeochemical and biodegradation processes. We examined the characteristics and spatial distribution of DOM in five major lakes, in an estuary, and in the coastal waters of the Mississippi, USA, and investigated the influence of the land use and land cover of their watersheds on the DOM composition...
April 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28412524/antimicrobial-resistance-and-genetic-diversity-of-the-sxt-element-in-vibrio-cholerae-from-clinical-and-environmental-water-samples-in-northeastern-thailand
#17
Wanida Mala, Kiatichai Faksri, Kittipan Samerpitak, Umaporn Yordpratum, Wanlop Kaewkes, Unchalee Tattawasart, Chariya Chomvarin
Multidrug resistance in V. cholerae has been increasing around the world including northeastern Thailand. The aquatic environment is a reservoir of V. cholerae and might be an important source of resistant strains. The aims of this study were to investigate the phylogenetic relationships of intSXT gene sequences from 31 clinical and 14 environmental V. cholerae O1 and non-O1/non-O139 isolates and 11 sequences amplified directly from environmental water samples. We also amplified class 1 integrons, the SXT elements (targeting the intSXT gene) and antimicrobial resistance genes directly from water samples...
April 12, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28411499/characteristics-and-environmental-fate-of-the-anionic-surfactant-sodium-lauryl-ether-sulphate-sles-used-as-the-main-component-in-foaming-agents-for-mechanized-tunnelling
#18
REVIEW
Anna Barra Caracciolo, Martina Cardoni, Tanita Pescatore, Luisa Patrolecco
The anionic surfactant sodium lauryl ether sulphate (SLES) is the main component of most commercial products used for soil conditioning in the excavation industry, in particular as lubricants for mechanized tunnelling. Its use during the excavation processes can result in either the subsequent possible re-use of the huge amount of soil debris as by-products (e.g. land covering) or its discharge as waste. Currently, there are neither SLES soil threshold limits in European legislation, nor comprehensive studies on the environmental risk for soil ecosystems in these exposure scenarios...
April 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28411224/concurrent-haloalkanoate-degradation-and-chlorate-reduction-by-pseudomonas-chloritidismutans-aw-1-t
#19
Peng Peng, Ying Zheng, Jasper J Koehorst, Peter J Schaap, Alfons J M Stams, Hauke Smidt, Siavash Atashgahi
Haloalkanoates are environmental pollutants that can be degraded aerobically by microorganisms producing hydrolytic dehalogenases. However, there is lack of information about anaerobic degradation of haloalkanoates. Genome analysis of Pseudomonas chloritidismutans AW-1(T), a facultative anaerobic chlorate-reducing bacterium, showed presence of two putative haloacid dehalogenase genes, l-dex and dehI, encoding an L-2-haloacid dehalogenase (L-DEX) and a halocarboxylic acid dehydrogenase (DehI). Hence, we studied concurrent degradation of haloalkanoates and chlorate as a yet unexplored trait of strain AW-1(T) The deduced amino acid sequences of L-DEX and DehI revealed 33-37% and 26-86% identities with biochemically/structurally characterized L-DEX and D-, DL-2-haloacid dehalogenase enzymes, respectively...
April 14, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28410528/modeling-the-spread-of-avian-influenza-viruses-in-aquatic-reservoirs-a-novel-hydrodynamic-approach-applied-to-the-rh%C3%A3-ne-delta-southern-france
#20
Marion Vittecoq, Hermann Gauduin, Thibault Oudart, Olivier Bertrand, Benjamin Roche, Matthieu Guillemain, Olivier Boutron
Wild aquatic birds represent a natural reservoir of avian influenza viruses (AIV) that can be spread to poultry. AIV epizootics were associated with huge economic impacts during the last decades and are still of major concern. Within aquatic bird populations AIV are transmitted either by direct contact or through the ingestion of water that has been contaminated by infected individuals. This second route involving environmental transmission is of utmost importance in AIV dynamics, yet it has received far less attention than direct bird-to-bird contamination...
April 11, 2017: Science of the Total Environment
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