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aquatic microbiology

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https://www.readbyqxmd.com/read/28523581/human-adenovirus-in-tissues-of-freshwater-snails-living-in-contaminated-waters
#1
J S Gularte, R Staggemeier, M Demoliner, T M S Heck, F H Heldt, R G F Ritzel, C Rigotto, A Henzel, F R Spilki
Human adenovirus (HAdV) is resistant to environment and can be used as a marker to detect fecal contamination. Considering the importance of freshwater snails in the aquatic environment, their use as concentrators for HAdV is a complementary tool for viral analysis of water. The goal of the study was to detect HAdV in snails and surface water collected from wetlands of the Sinos River (Rio Grande do Sul, Brazil) basin and to compare rates and viral loads found in both samples. HAdV was detected through real-time PCR...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28498940/contribution-of-aerobic-anoxygenic-phototrophic-bacteria-to-total-organic-carbon-pool-in-aquatic-system-of-subtropical-karst-catchments-southwest-china-evidence-from-hydrochemical-and-microbiological-study
#2
Qiang Li, Ang Song, Wenjie Peng, Zhenjiang Jin, Werner E G Müller, Xiaohong Wang
Aerobic anoxygenic phototrophic bacteria may play a particular role in carbon cycling of aquatic systems. However, little is known about the interaction between aerobic anoxygenic phototrophic bacteria and hydrochemistry in groundwater-surface water exchange systems of subtropical karst catchments. We carried out a detailed study on the abundance of aerobic anoxygenic phototrophic bacteria and bacterioplankton, hydrochemistry and taxonomy of bacterioplankton in the Maocun watershed, Southwest China, an area with karst geological background...
May 11, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28458656/change-in-the-structure-of-escherichia-coli-population-and-the-pattern-of-virulence-genes-along-a-rural-aquatic-continuum
#3
Fabienne Petit, Olivier Clermont, Sabine Delannoy, Pierre Servais, Michèle Gourmelon, Patrick Fach, Kenny Oberlé, Matthieu Fournier, Erick Denamur, Thierry Berthe
The aim of this study was to investigate the diversity of the Escherichia coli population, focusing on the occurrence of pathogenic E. coli, in surface water draining a rural catchment. Two sampling campaigns were carried out in similar hydrological conditions (wet period, low flow) along a river continuum, characterized by two opposite density gradients of animals (cattle and wild animals) and human populations. While the abundance of E. coli slightly increased along the river continuum, the abundance of both human and ruminant-associated Bacteroidales markers, as well as the number of E...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28447615/millions-of-boreal-shield-lakes-can-be-used-to-probe-archaean-ocean-biogeochemistry
#4
S L Schiff, J M Tsuji, L Wu, J J Venkiteswaran, L A Molot, R J Elgood, M J Paterson, J D Neufeld
Life originated in Archaean oceans, almost 4 billion years ago, in the absence of oxygen and the presence of high dissolved iron concentrations. Early Earth oxidation is marked globally by extensive banded iron formations but the contributing processes and timing remain controversial. Very few aquatic habitats have been discovered that match key physico-chemical parameters of the early Archaean Ocean. All previous whole ecosystem Archaean analogue studies have been confined to rare, low sulfur, and permanently stratified lakes...
April 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28417144/the-effect-of-reconstruction-works-on-planktonic-bacterial-diversity-of-a-unique-thermal-lake-revealed-by-cultivation-molecular-cloning-and-next-generation-sequencing
#5
Gergely Krett, Attila Szabó, Tamás Felföldi, Károly Márialigeti, Andrea K Borsodi
The aim of this study was to gain detailed information about the diversity of planktonic bacterial communities of a worldwide special peat bedded natural thermal spa lake, and to reveal the effect of a lake wall reconstruction work. To compare the efficiency of different methods used for analyzing bacterial diversity, cultivation, molecular cloning and pyrosequencing were applied simultaneously. Despite the almost unchanged physical-chemical parameters and cell count values of lake water, remarkable differences were observed in the planktonic bacterial community structures during and after the reconstruction by all applied microbiological approaches...
April 17, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28364400/impact-of-raking-and-bioturbation-mediated-ecological-manipulation-on-sediment-water-phosphorus-diagenesis-a-mesocosm-study-supported-with-radioactive-signature
#6
Jayanta K Biswas, Saumen Hazra, Jayjit Majumdar, Sushil K Mandal, Sabry M Shaheen, Santosh K Sarkar, Ralph Meissner, Erik Meers, Jörg Rinklebe
The study examined the impact of raking and fish bioturbation on modulating phosphorus (P) concentrations in the water and sediment under different trophic conditions. An outdoor experiment was set to monitor physicochemical and microbiological parameters of water and sediment influencing P diagenesis. A pilot study with radioactive (32)P was also performed under the agency of raking and bacteria (Bacillus sp.). Raking was more effective in release of P under unfertilized conditions by significantly enhancing orthophosphate (35%) and soluble reactive phosphate (31...
March 31, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28334157/overview-of-freshwater-microbial-eukaryotes-diversity-a-first-analysis-of-publicly-available-metabarcoding-data
#7
Didier Debroas, Isabelle Domaizon, Jean-Francois Humbert, Ludwig Jardillier, Cécile Lepère, Anne Oudart, Najwa Taïb
Although they are widespread, diverse and involved in biogeochemical cycles, microbial eukaryotes attract less attention than their prokaryotic counterparts in environmental microbiology. In this study, we used publicly available 18S barcoding data to define biases that may limit such analyses and to gain an overview of the planktonic microbial eukaryotic diversity in freshwater ecosystems. The richness of the microbial eukaryotes was estimated to 100 798 operational taxonomic units (OTUs) delineating 1267 clusters or phylogenetic units (PUs, i...
April 1, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28290555/microbial-communities-of-aquatic-environments-on-heard-island-characterized-by-pyrotag-sequencing-and-environmental-data
#8
Michelle A Allen, Ricardo Cavicchioli
Heard Island in the Southern Ocean is a biological hotspot that is suffering the effects of climate change. Significant glacier retreat has generated proglacial lagoons, some of which are open to the ocean. We used pyrotag sequencing of SSU rRNA genes and environmental data to characterize microorganisms from two pools adjacent to animal breeding areas, two glacial lagoons and Atlas Cove (marine site). The more abundant taxa included Actinobacteria, Bacteroidetes and Proteobacteria, ciliates and picoflagellates (e...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28271855/prevalence-of-foodborne-pathogens-in-food-from-selected-african-countries-a-meta-analysis
#9
REVIEW
Narayan Paudyal, Victor Anihouvi, Joseph Hounhouigan, Maitshwarelo Ignatius Matsheka, Bonno Sekwati-Monang, Wisdom Amoa-Awua, Amy Atter, Nina Bernice Ackah, Samuel Mbugua, Agnes Asagbra, Warda Abdelgadir, Jesca Nakavuma, Mogens Jakobsen, Weihuan Fang
Food safety information in the African region is insufficient and fragmented due to lack of surveillance, documentation and reporting, thereby resulting in inefficient utilization of resources, duplication of activities, and lack of synergy among the countries of the region. This paper reviews the prevalence of foodborne pathogens in seven African countries (Benin, Botswana, Ghana, Kenya, Nigeria, Sudan and Uganda) from papers in regional or international journals published between January 2000 and December 2015...
March 6, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28207310/microbiological-quality-and-prevalence-of-%C3%AE-lactam-antibiotic-resistance-genes-in-oysters-crassostrea-rhizophorae
#10
Maria Aparecida da RessurreiÇão Brandão, Amanda Teixeira Sampaio Lopes, Maria Tereza da Silva Neta, Rhyan Barros Farias de Oliveira, Rachel Passos Rezende, George Rêgo Albuquerque, Verônica Dias Gonçalves, Dália Dos Prazeres Rodrigues, Guisla Boehs, Bianca Mendes Maciel
The microbiological quality of oysters reflects the microbiological quality of their habitats because they are filter feeders. The objective of this study was to assess the bacterial composition of the edible oyster Crassostrea rhizophorae in urban and preserved estuaries. Particularly, we assessed the presence of pathogenic bacteria, investigated antibiotic susceptibility in bacterial isolates, and quantified β-lactam antibiotic resistance genes (blaTEM, blaSHV, and blaKPC) via quantitative PCR of oyster DNA...
March 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28117550/abundant-carbon-substrates-drive-extremely-high-sulfate-reduction-rates-and-methane-fluxes-in-prairie-pothole-wetlands
#11
Paula Dalcin Martins, David W Hoyt, Sheel Bansal, Christopher T Mills, Malak Tfaily, Brian A Tangen, Raymond G Finocchiaro, Michael D Johnston, Brandon C McAdams, Matthew J Solensky, Garrett J Smith, Yu-Ping Chin, Michael J Wilkins
Inland waters are increasingly recognized as critical sites of methane emissions to the atmosphere, but the biogeochemical reactions driving such fluxes are less well understood. The Prairie Pothole Region (PPR) of North America is one of the largest wetland complexes in the world, containing millions of small, shallow wetlands. The sediment pore waters of PPR wetlands contain some of the highest concentrations of dissolved organic carbon (DOC) and sulfur species ever recorded in terrestrial aquatic environments...
January 24, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28114378/frna-bacteriophages-as-viral-indicators-of-faecal-contamination-in-mexican-tropical-aquatic-systems
#12
Luis Jose Rene Arredondo-Hernandez, Carlos Diaz-Avalos, Yolanda Lopez-Vidal, Gonzalo Castillo-Rojas, Marisa Mazari-Hiriart
A particular challenge to water safety in populous intertropical regions is the lack of reliable faecal indicators to detect microbiological contamination of water, while the numerical relationships of specific viral indicators remain largely unexplored. The aim of this study was to investigate the numerical relationships of FRNA-bacteriophage genotypes, adenovirus 41, and human adenoviruses (HADV) in Mexican surface water systems to assess sewage contamination. We studied the presence of HADV, HADV41 and FRNA bacteriophage genotypes in water samples and quantified by qPCR and RT-qPCR...
2017: PloS One
https://www.readbyqxmd.com/read/27982438/an-outbreak-of-shewanella-putrefaciens-group-in-wild-eels-anguilla-anguilla-l-favoured-by-hypoxic-aquatic-environments
#13
C Esteve, R Merchán, E Alcaide
Microbiological analyses were conducted on wild eels from the L'Albufera Lake (Spain). A total of 174 individuals were collected in two surveys (i.e. year 2008 and autumn-winter 2014) among those caught by local fishermen into the lagoon. The prevalence of Shewanella putrefaciens group was 1.7% in 2008 and rose above 32% in 2014. It was due to an outbreak of shewanellosis that presented a morbidity rate of 64%. S. putrefaciens group strains were isolated as pure cultures from the sick eels that showed white ulcers surrounded by a reddish inflammation, damage of the mouth, extensive skin discoloration, exophthalmia, ascites and bad odour...
December 16, 2016: Journal of Fish Diseases
https://www.readbyqxmd.com/read/27913070/basagran-%C3%A2-induces-developmental-malformations-and-changes-the-bacterial-community-of-zebrafish-embryos
#14
Jacinta M M Oliveira, Victor Galhano, Isabel Henriques, Amadeu M V M Soares, Susana Loureiro
This study aimed to assess the effects of Basagran(®) on zebrafish (Danio rerio) embryos. The embryos were exposed to Basagran(®) at concentrations ranging from 120.0 to 480.6 mg/L, and the effects on embryo development (up to 96 h) and bacterial communities of 96 h-larvae were assessed. The embryo development response was time-dependent and concentration-dependent (106.35 < EC50 < 421.58 mg/L). The sensitivity of embryo-related endpoints decreased as follows: blood clotting in the head and/or around the yolk sac > delay or anomaly in yolk sac absorption > change in swimming equilibrium > development of pericardial and/or yolk sac oedema > scoliosis...
February 2017: Environmental Pollution
https://www.readbyqxmd.com/read/27843109/non-cholera-vibrios-the-microbial-barometer-of-climate-change
#15
REVIEW
Craig Baker-Austin, Joaquin Trinanes, Narjol Gonzalez-Escalona, Jaime Martinez-Urtaza
There is a growing interest in the role of climate change in driving the spread of waterborne infectious diseases, such as those caused by bacterial pathogens. One particular group of pathogenic bacteria - vibrios - are a globally important cause of diseases in humans and aquatic animals. These Gram-negative bacteria, including the species Vibrio vulnificus, Vibrio parahaemolyticus and Vibrio cholerae, grow in warm, low-salinity waters, and their abundance in the natural environment mirrors ambient environmental temperatures...
January 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/27588572/genotoxic-and-mutagenic-evaluation-of-water-samples-from-a-river-under-the-influence-of-different-anthropogenic-activities
#16
Nelson Jorge Carvalho Batista, Ana Amélia de Carvalho Melo Cavalcante, Maria Geci de Oliveira, Eugênia Cristina Nascimento Medeiros, Joseane Lustosa Machado, Sebastiana Ribeiro Evangelista, Johnny F Dias, Carla E I Dos Santos, Anaí Duarte, Fernanda R da Silva, Juliana da Silva
Pollution of aquatic ecosystems is associated with the discharge of mostly industrial and urban effluents, which may cause loss of biodiversity and damage to public health. This study aims to evaluate the toxicity and mutagenicity of water samples collected in the Corrente River, a major waterway in the river basin district of Pedro II, Piauí (Brazil). This river is exposed to intense anthropogenic influence from urban, automotive mechanical and family farm waste, and it is used as the main source of water supply by the population...
December 2016: Chemosphere
https://www.readbyqxmd.com/read/27352975/microbiological-investigations-on-the-water-of-a-thermal-bath-at-budapest
#17
Sára Szuróczki, Zsuzsa Kéki, Szandra Káli, Anett Lippai, Károly Márialigeti, Erika Tóth
Thermal baths are unique aquatic environments combining a wide variety of natural and anthropogenic ecological factors, which also appear in their microbiological state. There is limited information on the microbiology of thermal baths in their complexity, tracking community shifts from the thermal wells to the pools. In the present study, the natural microbial community of well and pool waters in Gellért bath was studied in detail by cultivation-based techniques. To isolate bacteria, 10% R2A and minimal synthetic media (with "bath water") with agar-agar and gellan gum were used after prolonged incubation time; moreover, polyurethane blocks covered with media were also applied...
June 2016: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/27263181/update-from-the-council-for-the-model-aquatic-health-code-and-why-you-should-join
#18
Douglas Sackett
No abstract text is available yet for this article.
May 2016: Journal of Environmental Health
https://www.readbyqxmd.com/read/27170052/controls-on-metal-exposure-to-aquatic-organisms-in-urban-streams
#19
REVIEW
Katelyn Turpin-Nagel, Timothy M Vadas
Streams in urban ecosystems receive metal inputs primarily from stormwater runoff and wastewater effluent. The relative contribution of these metal sources to stream impairment is difficult to discern based on simple water characteristics and biological surveys. Stream impairment in these systems is often indicated by reduced abundance and diversity of aquatic insects, which tend to be more sensitive to chronic metal exposures. Metal species and controls on metal species in both the waterborne and dietborne exposure pathways to aquatic organisms are reviewed here...
August 10, 2016: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/27094269/recent-changes-1973-2014-versus-1903-1972-in-the-flow-regime-of-the-lower-paran%C3%A3-river-and-current-fluvial-pollution-warnings-in-its-delta-biosphere-reserve
#20
Alba Puig, Héctor F Olguín Salinas, Juan A Borús
Alterations in flow regimes of large rivers may originate or increase risks to ecosystems and humans. The Paraná River basin (South America) undergoes human pressures (e.g., heavy damming in the upper basin, deforestation, and mixed pollution) that may affect the water quantity and quality of its terminal Delta (Argentina). In this study, after applying univariate and multivariate change-point detection and trend analyses to the daily data series of flows incoming to the Delta (Paraná-Santa Fe section), flow characteristics were compared by Indicators of Hydrologic Alteration (IHA) and Environmental Flow Components (EFC)...
June 2016: Environmental Science and Pollution Research International
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