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https://www.readbyqxmd.com/read/28929016/age-growth-mortality-and-reproductive-seasonality-of-jolthead-porgy-calamus-bajonado-from-florida-waters
#1
Michael L Burton, Jennifer C Potts, Jordan Page, Ariel Poholek
Ages of jolthead porgy (Calamus bajonado Schneider 1801) (n = 635) from Florida commercial and recreational fisheries from 2008-2016 were determined using sectioned sagittal otoliths. We determined, using edge-type analysis, that opaque zones were annular, forming March-June (peaking in April). Jolthead porgy ranged from 1-13 years, and the largest fish measured 680 mm TL (total length, mm). Body size relationships for jolthead porgy were TL = 1.09FL + 20.44 (n = 622, r(2) = 0.99), FL = 0.90 TL -14...
2017: PeerJ
https://www.readbyqxmd.com/read/28918274/distribution-comparison-and-risk-assessment-of-free-floating-and-particle-attached-bacterial-pathogens-in-urban-recreational-water-implications-for-water-quality-management
#2
Tingting Fang, Qijia Cui, Yong Huang, Peiyan Dong, Hui Wang, Wen-Tso Liu, Quanhui Ye
The risk of pathogen exposure in recreational water is a concern worldwide. Moreover, suspended particles, as ideal shelters for pathogens, in these waters also need attention. However, the risk caused by the pathogen-particle attachment is largely unknown. Accordingly, water samples in three recreational lakes in Beijing were collected and separated into free-floating (FL, 0.22-5μm) and particle-attached (PA, >5μm) fractions. Next-generation sequencing (NGS) was employed to determine the diversity of genera containing pathogens, and quantitative PCR (qPCR) was used to assess the presence of genes from Escherichia coli (uidA), Salmonella enterica (invA), Aeromonas spp...
September 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28916458/molecular-identification-of-waterborn-free-living-amoebae-acanthamoeba-naegleria-and-vermamoeba-isolated-from-municipal-drinking-water-and-environmental-sources-north-half-of-iran
#3
Ehsan Javanmard, Maryam Niyyati, Jacob Lorenzo-Morales, Zohreh Lasjerdi, Hamed Behniafar, Hamed Mirjalili
The present study tested 80 samples of municipal, geothermal and recreational water samples for the occurrence of waterborn free living amoebae (FLA) including Acanthamoeba, Balamuthia mandrillaris, Vahlkampfiids and Vermamoeba in Semnan province, North half of Iran. Four sets of primers including JDP1,2 primers, ITS1,2 primers (Vahlkampfiids), 16S rRNABal primers (Balamuthia mandrillaris) and NA1,2 primers (Vermamoeba) were used to confirm the morphological identification. From the 80 water samples tested in the present study, 16 (20%) were positive for the outgrowth of free living amoebae based on the morphological page key...
September 12, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28899309/waterparks-are-high-risk-for-cryptosporidiosis-a-case-control-study-in-victoria-2015
#4
Tanyth E de Gooyer, Joy Gregory, Marion Easton, Nicola Stephens, Emily Fearnley, Martyn Kirk
BACKGROUND: An increase in notifications of cryptosporidiosis was observed in Victoria between March and April 2015. Cases mostly resided in one metropolitan region and hypothesis-generating interviews identified common exposures to aquatic facilities. We conducted a case-control study to determine exposure source(s) and facilitate control measures. METHODS: Laboratory-confirmed cases of cryptosporidiosis from the region of interest notified between 1 March and 23 April 2015 were included...
June 30, 2017: Communicable Diseases Intelligence Quarterly Report
https://www.readbyqxmd.com/read/28885961/effectiveness-of-ice-sheet-cooling-following-exertional-hyperthermia
#5
Cory L Butts, Debora L Spisla, J D Adams, Cody R Smith, Kathleen M Paulsen, Aaron R Caldwell, Matthew S Ganio, Brendon P McDermott
BACKGROUND: The procedure of wrapping a heat casualty in ice-water soaked bed sheets to reduce core temperature has received little investigation, despite the practice and recommendation for its use in some military settings. Thus, the purpose of this study was to investigate the cooling efficacy of ice-sheet cooling (ISC) following exertional hyperthermia. METHODS: 13 (11 males, 2 females) participants (age = 23 ± 3 years, height = 176.5 ± 10.3 cm, mass = 78...
September 2017: Military Medicine
https://www.readbyqxmd.com/read/28883487/reconciling-the-opposing-effects-of-warming-on-phytoplankton-biomass-in-188-large-lakes
#6
Benjamin M Kraemer, Thomas Mehner, Rita Adrian
Lake ecosystems are deeply integrated into local and regional economies through recreation, tourism, and as sources of food and drinking water. Shifts in lake phytoplankton biomass, which are mediated by climate warming will alter these benefits with potential cascading effects on human well-being. The metabolic theory of ecology suggests that warming reduces lake phytoplankton biomass as basal metabolic costs increase, but this hypothesis has not been tested at the global scale. We use satellite-based estimates of lake surface temperature (LST) and lake surface chlorophyll-a concentration (chl-a; as a proxy for phytoplankton biomass) in 188 of the world's largest lakes from 2002-2016 to test for interannual associations between chl-a and LST...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28873449/benthic-community-structure-on-coral-reefs-exposed-to-intensive-recreational-snorkeling
#7
Bobbie Renfro, Nanette E Chadwick
Chronic anthropogenic disturbances on coral reefs in the form of overfishing and pollution can shift benthic community composition away from stony corals and toward macroalgae. The use of reefs for recreational snorkeling and diving potentially can lead to similar ecological impacts if not well-managed, but impacts of snorkeling on benthic organisms are not well understood. We quantified variation in benthic community structure along a gradient of snorkeling frequency in an intensively-visited portion of the Mesoamerican Barrier Reef...
2017: PloS One
https://www.readbyqxmd.com/read/28869549/microbiological-impact-of-the-use-of-reclaimed-wastewater-in-recreational-parks
#8
Oskar A Palacios, Francisco J Zavala-Díaz de la Serna, María de Lourdes Ballinas-Casarrubias, María S Espino-Valdés, Guadalupe V Nevárez-Moorillón
Reclaimed wastewater for irrigation is an opportunity for recovery of this natural resource. In this study, microbial risk from the use of treated wastewater for irrigation of recreational parks in the city of Chihuahua, evaluating the effect of distribution distance, season, and presence of storage tanks, was analyzed. Escherichia coli, Salmonella, and multidrug-resistant bacteria were recovered from samples of reclaimed water and soils at recreational parks in Chihuahua by the membrane filtration method, using selected agars for microbial growth...
September 4, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28862669/antimicrobial-susceptibility-of-staphylococcus-aureus-isolated-from-recreational-waters-and-beach-sand-in-eastern-cape-province-of-south-africa
#9
Olufemi Emmanuel Akanbi, Henry Akum Njom, Justine Fri, Anthony C Otigbu, Anna M Clarke
Background: Resistance of Staphylococcus aureus to commonly used antibiotics is linked to their ability to acquire and disseminate antimicrobial-resistant determinants in nature, and the marine environment may serve as a reservoir for antibiotic-resistant bacteria. This study determined the antibiotic sensitivity profile of S.aureus isolated from selected beach water and intertidal beach sand in the Eastern Cape Province of South Africa. Methods: Two hundred and forty-nine beach sand and water samples were obtained from 10 beaches from April 2015 to April 2016...
September 1, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28862444/manual-and-flow-injection-detection-quantification-of-polyquaterniums-via-fully-reversible-polyion-sensitive-polymeric-membrane-based-ion-selective-electrodes
#10
Stephen A Ferguson, Mark E Meyerhoff
The detection of four different polyquaterniums (PQs) using a fully reversible potentiometric polyion sensor in three different detection modes is described. The polyion sensing "pulstrodes" serve as the detector for direct dose-response experiments, beaker titrations, and in a flow-injection analysis (FIA) system. Direct polycation response toward PQ-2, PQ-6, PQ-10, and poly(2-methacryloxyethyltrimethylammonium) chloride (PMETAC) yields characteristic information about each PQ species (e.g., relative charge densities, etc...
September 18, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28823013/dynamics-of-total-microcystin-lr-concentration-in-three-subtropical-hydroelectric-generation-reservoirs-in-uruguay-south-america
#11
Mauricio González-Piana, Daniel Fabián, Andrea Piccardo, Guillermo Chalar
This study analyzed the temporal dynamics of total microcystin LR concentrations between the years of 2012 and 2015 in the Bonete, Baygorria and Palmar hydroelectric generation reservoirs in the central region of the Negro River, Uruguay. The three reservoirs showed differents total microcystin LR concentration, with no significant differences among them. Over 20 sampling dates, the three reservoirs exhibited total microcystin LR concentrations on eight occasions that corresponded to a slight to moderate human health risk according to WHO guideline values for recreational waters...
August 20, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28810509/spatiotemporal-assessment-and-trade-offs-of-multiple-ecosystem-services-based-on-land-use-changes-in-zengcheng-china
#12
Xiao Sun, Feng Li
Driven by rapid urbanization, land use change has become a significant factor influencing ecosystem services (ESs). To support the decision-making process of city planners and policy makers, assessing the spatiotemporal changes associated with multiple ESs is vital. In this study, we developed a general structure to assess the changes of multiple ESs in Zengcheng, China. A new index also was developed to measure the comprehensive ecosystem service (CES). Trade-offs of various ESs were analyzed by using correlation analysis...
December 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28809869/-some-considerations-on-revision-of-legislation-hygiene-sanitary-for-the-management-of-swimming-pools-for-swimming-pool-use-and-the-national-consultation-of-the-ministry-of-health
#13
Federica Valeriani, Rossella Briancesco, Sara Sanzari, Gianluca Gianfranceschi, Emanuele Ferretti, Lucia Bonadonna, Vincenzo Romano Spica
After over a decade the Italian regulation on hygiene and surveillance in swimming pools is under revision based on WHO guidelines and current laws from other European countries. The Ministry of Health is proposing an update of the Annex 1 that contains physical, chemical and microbiological indicators for monitoring swimming pool hygiene. The authors review current regulations and the new proposal for updating surveillance. A comparison of Annex 1 as approved in 2003 and the new version as proposed in 2016 allowed to enlighten innovative improvements...
May 2017: Igiene e Sanità Pubblica
https://www.readbyqxmd.com/read/28806081/chlorination-kinetics-of-11-nor-9-carboxy-%C3%AE-9-tetrahydrocannabinol-effects-of-ph-and-humic-acid
#14
Allison L Mackie, Yu Ri Park, Graham A Gagnon
The main psychoactive compound in marijuana, Δ(9)-tetrahydrocannabinol (THC), and its metabolites are emerging organic contaminants that have been detected in waste and surface waters. As legalization of marijuana for medical and recreational use continues, the effects of increased use and potency of marijuana on water and wastewater treatment processes and the environment should be considered. This study examined degradation kinetics of the main urinary metabolite of THC, 11-nor-9-carboxy-Δ(9)-tetrahydrocannabinol (THC-COOH) with chlorine...
August 29, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28761562/assessment-of-physicochemical-and-microbiological-quality-of-public-swimming-pools-in-addis-ababa-ethiopia
#15
Kokebe Yedeme, Melese Hailu Legese, Almaz Gonfa, Somson Girma
BACKGROUND: From swimming pools, bathers may acquire many potential pathogens or may be affected by the physicochemical characteristics of water used during bathing. Hence, this study aimed at assessing the physicochemical and microbiological quality of public swimming pools located at different hotels and recreation center in Addis Ababa, Ethiopia. METHOD: A cross sectional study was carried out from February to May, 2016. Nine hotels and one recreation center which recognized to have public swimming services were included...
2017: Open Microbiology Journal
https://www.readbyqxmd.com/read/28755717/a-method-for-examining-temporal-changes-in-cyanobacterial-harmful-algal-bloom-spatial-extent-using-satellite-remote-sensing
#16
Erin A Urquhart, Blake A Schaeffer, Richard P Stumpf, Keith A Loftin, P Jeremy Werdell
Cyanobacterial harmful algal blooms (CyanoHAB) are thought to be increasing globally over the past few decades, but relatively little quantitative information is available about the spatial extent of blooms. Satellite remote sensing provides a potential technology for identifying cyanoHABs in multiple water bodies and across geo-political boundaries. An assessment method was developed using MEdium Resolution Imaging Spectrometer (MERIS) imagery to quantify cyanoHAB surface area extent, transferable to different spatial areas, in Florida, Ohio, and California for the test period of 2008 to 2012...
July 2017: Harmful Algae
https://www.readbyqxmd.com/read/28750330/modelling-the-transport-and-decay-processes-of-microbial-tracers-in-a-macro-tidal-estuary
#17
Amyrhul Abu-Bakar, Reza Ahmadian, Roger A Falconer
The Loughor Estuary is a macro-tidal coastal basin, located along the Bristol Channel, in the South West of the U.K. The maximum spring tidal range in the estuary is up to 7.5 m, near Burry Port Harbour. This estuarine region can experience severe coastal flooding during high spring tides, including extreme flooding of the intertidal saltmarshes at Llanrhidian, as well as the lower industrial and residential areas at Llanelli and Gowerton. The water quality of this estuarine basin needs to comply with the designated standards for safe recreational bathing and shellfish harvesting industries...
July 3, 2017: Water Research
https://www.readbyqxmd.com/read/28734349/integrated-preservation-and-sample-clean-up-procedures-for-studying-water-ingestion-by-recreational-swimmers-via-urinary-biomarker-determination
#18
Ricardo Cantú, Jody A Shoemaker, Catherine A Kelty, Larry J Wymer, Thomas D Behymer, Alfred P Dufour, Matthew L Magnuson
The use of cyanuric acid as a biomarker for ingestion of swimming pool water may lead to quantitative knowledge of the volume of water ingested during swimming, contributing to a better understanding of disease resulting from ingestion of environmental contaminants. When swimming pool water containing chlorinated cyanurates is inadvertently ingested, cyanuric acid is excreted quantitatively within 24 h as a urinary biomarker of ingestion. Because the volume of water ingested can be quantitatively estimated by calculation from the concentration of cyanuric acid in 24 h urine samples, a procedure for preservation, cleanup, and analysis of cyanuric acid was developed to meet the logistical demands of large scale studies...
August 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28704433/forecasting-distributions-of-an-aquatic-invasive-species-nitellopsis-obtusa-under-future-climate-scenarios
#19
Daniel Romero-Alvarez, Luis E Escobar, Sara Varela, Daniel J Larkin, Nicholas B D Phelps
Starry stonewort (Nitellopsis obtusa) is an alga that has emerged as an aquatic invasive species of concern in the United States. Where established, starry stonewort can interfere with recreational uses of water bodies and potentially have ecological impacts. Incipient invasion of starry stonewort in Minnesota provides an opportunity to predict future expansion in order to target early detection and strategic management. We used ecological niche models to identify suitable areas for starry stonewort in Minnesota based on global occurrence records and present-day and future climate conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28685372/applying-a-water-quality-index-model-to-assess-the-water-quality-of-the-major-rivers-in-the-kathmandu-valley-nepal
#20
Ram Krishna Regmi, Binaya Kumar Mishra, Yoshifumi Masago, Pingping Luo, Asako Toyozumi-Kojima, Shokhrukh-Mirzo Jalilov
Human activities during recent decades have led to increased degradation of the river water environment in South Asia. This degradation has led to concerns for the populations of the major cities of Nepal, including those of the Kathmandu Valley. The deterioration of the rivers in the valley is directly linked to the prevalence of poor sanitary conditions, as well as the presence of industries that discharge their effluents into the river. This study aims to investigate the water quality aspect for the aquatic ecosystems and recreation of the major rivers in the Kathmandu Valley using the Canadian Council of Ministers of the Environment water quality index (CCME WQI)...
August 2017: Environmental Monitoring and Assessment
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