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https://www.readbyqxmd.com/read/28101712/herbicides-and-trace-metals-in-urban-waters-in-melbourne-australia-2011-12-concentrations-and-potential-impact
#1
Mayumi Allinson, Pei Zhang, AnhDuyen Bui, Jackie H Myers, Vincent Pettigrove, Gavin Rose, Scott A Salzman, Robert Walters, Graeme Allinson
Urban stormwater samples were collected from five aquatic systems in Melbourne, Australia, on six occasions between October 2011 and March 2012 and tested for 30 herbicides and 14 trace metals. Nineteen different herbicides were observed in one or more water samples from the five sites; chemicals observed at more than 40% of sites were simazine (100%), MCPA (83%), diuron (63%) and atrazine (53%). Using the toxicity unit (TU) concept to assess potential risk to aquatic ecosystems, none of the detected herbicides were considered to pose an individual, group or collective short-term risk to fish or zooplankton in the waters studied...
January 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28101706/comparative-assessment-of-leca-and-spartina-maritima-to-remove-emerging-organic-contaminants-from-wastewater
#2
Ana Rita Ferreira, Paula Guedes, Eduardo P Mateus, Alexandra B Ribeiro, Nazaré Couto
The present work aimed to evaluate the capacity of constructed wetlands (CWs) to remove three emerging organic contaminants with different physicochemical properties: caffeine (CAF), oxybenzone (MBPh), and triclosan (TCS). The simulated CWs were set up with a matrix of light expanded clay aggregates (LECA) and planted with Spartina maritima, a salt marsh plant. Controlled experiments were carried out in microcosms using deionized water and wastewater collected at a wastewater treatment plant (WWTP), with different contaminant mass ranges, for 3, 7, and 14 days...
January 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28101632/a-discrete-time-model-for-population-persistence-in-habitats-with-time-varying-sizes
#3
Ying Zhou, William F Fagan
In this paper, we use periodic and stochastic integrodifference models to study the persistence of a single-species population in a habitat with temporally varying sizes. We extend a persistence metric for integral operators on bounded domains to that of integral operators on unbounded domains. Using this metric in the periodic model, we present new perspectives of the critical habitat size problem in the case of dynamically changing habitat sizes. Specifically, we extend the concept of critical habitat size to that of lower minimal limit size in a period-2 scenario, and prove the existence of the lower minimal limit size...
January 18, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/28098236/wind-wave-behavior-in-fetch-and-depth-limited-estuaries
#4
Arash Karimpour, Qin Chen, Robert R Twilley
Wetland dominated estuaries serve as one of the most productive natural ecosystems through their ecological, economic and cultural services, such as nursery grounds for fisheries, nutrient sequestration, and ecotourism. The ongoing deterioration of wetland ecosystems in many shallow estuaries raises concerns about the contributing erosive processes and their roles in restraining coastal restoration efforts. Given the combination of wetlands and shallow bays as landscape components that determine the function of estuaries, successful restoration strategies require knowledge of wind wave behavior in fetch and depth limited water as a critical design feature...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28093674/prospect-of-recovering-phosphorus-in-magnesium-slag-packed-wetland-filter
#5
Xianqiang Tang, Min Wu, Rui Li, Zhenhua Wang
Phosphorus recovery from wastewater not only reduces the unbearable impacts of excessive nutrient discharge on environmental systems but also favor the reuse of phosphorus resource. Based on the mechanism as well as technical analysis for major phosphorus recovery techniques including struvite precipitation and wetland substrate adsorption, a novel magnesium slag-packed wetland filter and corresponding operational procedures are proposed, which aim to reduce the dependence of using magnesium-containing chemical reagent as magnesium sources for struvite precipitation, and improve the accumulation and recovery performance for struvite precipitation within porous wetland substrate...
January 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28091741/chemical-physical-and-biological-factors-shape-littoral-invertebrate-community-structure-in-coal-mining-end-pit-lakes
#6
Andreas Luek, Joseph B Rasmussen
Aquatic invertebrates form the base of the consumer food web in lakes. In coal-mining end-pit lakes, invertebrates are exposed to an environment with potentially challenging physical and chemical features. We hypothesized that the physical and chemical features of end-pit lakes reduce critical littoral habitat and thus reduce invertebrate diversity, thereby limiting the potential for these lakes to be naturalized. We used a multivariate approach using principle component analysis and redundancy analysis to study relationships between invertebrate community structure, habitat features, and water quality in five end-pit lakes and five natural lakes in the Rocky Mountain foothills of west-central Alberta, Canada...
January 13, 2017: Environmental Management
https://www.readbyqxmd.com/read/28089933/hfb7-a-novel-orphan-hydrophobin-of-the-harzianum-and-virens-clades-of-trichoderma-is-involved-in-response-to-biotic-and-abiotic-stresses
#7
Agnes Przylucka, Gunseli Bayram Akcapinar, Komal Chenthamara, Feng Cai, Marica Grujuc, Juriy Karpenko, Miriam Livoi, Qirong Shen, Christian P Kubicek, Irina S Druzhinina
Hydrophobins are small secreted cysteine-rich proteins exclusively found in fungi. They are able to self-assemble in single molecular layers at hydrophobic-hydrophilic interfaces and can therefore be directly involved in establishment of fungi in their habitat. The genomes of filamentous mycotrophic fungi Trichoderma encode a rich diversity of hydrophobins, which are divided in several groups based on their structure and evolution. Here we describe a new member of class II hydrophobins, HFB7, that has a taxonomically restricted occurrence in Harzianum and Virens clades of Trichoderma...
January 12, 2017: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/28088848/mercury-bioaccumulation-in-estuarine-fishes-novel-insights-from-sulfur-stable-isotopes
#8
James J Willacker, Collin A Eagles-Smith, Joshua T Ackerman
Estuaries are transitional habitats characterized by complex biogeochemical and ecological gradients that result in substantial variation in fish total mercury concentrations (THg). We leveraged these gradients and used carbon (δ(13)C), nitrogen (δ(15)N), and sulfur (δ(34)S) stable isotopes to examine the ecological and biogeochemical processes underlying THg bioaccumulation in fishes from the San Francisco Bay Estuary. We employed a tiered approach that first examined processes influencing variation in fish THg among wetlands, and subsequently examined the roles of habitat and within-wetland processes in generating larger-scale patterns in fish THg...
January 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28088722/in-situ-denitrification-and-dnra-rates-in-groundwater-beneath-an-integrated-constructed-wetland
#9
M M R Jahangir, O Fenton, C Müller, R Harrington, P Johnston, K G Richards
Evaluation of the environmental benefits of constructed wetlands (CWs) requires an understanding of their impacts on the groundwater quality under the wetlands. Empirical mass-balance (nitrogen in/nitrogen out) approaches for estimating nitrogen (N) removal in CWs do not characterise the final fate of N; where nitrate (NO3(-)-N) could be reduced to either ammonium (NH4(+)-N) or N2 with the potential for significant production of N2O. Herein, in situ denitrification and DNRA (dissimilatory nitrate reduction to ammonium) rates were measured in groundwater beneath cells of an earthen lined integrated constructed wetland (ICW, used to remove the nutrients from municipal wastewater) using the (15)N-enriched NO3(-)-N push-pull method...
January 7, 2017: Water Research
https://www.readbyqxmd.com/read/28078492/first-report-of-bla-ctx-m-15-type-esbl-producing-klebsiella-pneumoniae-in-wild-migratory-birds-in-pakistan
#10
Shahbaz Raza, Mashkoor Mohsin, Waqas Ahmed Madni, Fatima Sarwar, Muhammad Saqib, Bilal Aslam
We investigated wild migratory birds faecal swabs for extended-spectrum β-lactamases-producing Klebsiella pneumoniae (ESBL-K. pneumoniae) from wetland habitats in Pakistan. ESBL-K. pneumoniae were analysed for MDR phenotype, ESBL genotype and genetic diversity. A total of 13 (8.6%) ESBL-K. pneumoniae were recovered. Of these, 8 (61%) isolates were MDR. DNA sequencing confirmed bla CTX-M-15 as the dominant ESBL genotype. BOX-PCR fingerprints showed most of the isolates are unrelated. This study is the first to report the wildlife contamination of CTX-M-15-producing K...
January 11, 2017: EcoHealth
https://www.readbyqxmd.com/read/28076373/larvae-and-nests-of-aculeate-hymenoptera-hymenoptera-aculeata-nesting-in-reed-galls-induced-by-lipara-spp-diptera-chloropidae-with-a-review-of-species-recorded-part-ii
#11
Alena Astapenková, Petr Heneberg, Petr Bogusch
The ability of aculeate Hymenoptera to utilize wetlands is poorly understood, and descriptions of their nests and developmental stages are largely absent. Here we present results based on our survey of hymenopterans using galls induced by Lipara spp. flies on common reed Phragmites australis in the years 2015-2016. We studied 20,704 galls, of which 9,446 were longitudinally cut and the brood from them reared in the laboratory, while the remaining 11,258 galls reared in rearing bags also in laboratory conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28074363/risk-assessment-of-agriculture-impact-on-the-fr%C3%A3-o-river-watershed-and-ca%C3%A3-o-negro-ramsar-wetland-costa-rica
#12
María-Luisa Fournier, Silvia Echeverría-Sáenz, Freylan Mena, María Arias-Andrés, Elba de la Cruz, Clemens Ruepert
The Caño Negro Ramsar wetland is a conservation area of great natural and societal value, located in the lower part of the Frío River watershed in the north of Costa Rica. Its aquatic ecosystems may be considered vulnerable to pollution due to recent changes in land use toward agriculture. In 2011 and 2012, quarterly sampling was done at ten sites located in the middle and lower sections of the Frío River Basin that pass through crop areas and later drain into Caño Negro wetland. Pesticide residues, nitrates, sediment concentrations, and diversity of benthic macroinvertebrates and fish biomarkers were studied in the selected sites...
January 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28074227/heavy-metals-in-liver-and-brain-of-waterfowl-from-the-evros-delta-greece
#13
Maria Aloupi, Asimina Karagianni, Savas Kazantzidis, Triantaphyllos Akriotis
The concentrations of six heavy metals (cadmium [Cd], chromium [Cr], copper [Cu], manganese [Mn], lead [Pb], and zinc [Zn]) were determined in liver and brain of nine species of waterfowl from the Evros Delta, one of the most important wetlands in Greece, to assess metal contamination and potential risk to waterfowl. Significant differences among species were found for hepatic Cr, Cu, Pb, and Zn; the highest levels of all metals were found in liver of mute swans. Cd increased significantly with age in both organs of wigeon; some differences were also observed between males and females of the same species...
January 10, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28073487/distribution-and-ecological-risk-assessment-of-heavy-metals-in-surface-sediments-of-a-typical-restored-mangrove-aquaculture-wetland-in-shenzhen-china
#14
Jianxiang Feng, Xiaoshan Zhu, Hao Wu, Cunxin Ning, Guanghui Lin
The restoration of wetlands has attracted the attention in different countries. Restored coastal wetlands, especially urban wetlands, are sensitive to external pressures. Thus, it is necessary to evaluate the efficiency of the restoration of coastal wetlands, which benefits their management and functional maintenance. In this study, a restored mangrove-aquaculture system in Waterlands Resort at Shenzhen was selected for analysis. The distribution and ecological risk assessment of heavy metals in surface sediments were investigated...
January 7, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28070812/plant-species-diversity-reduces-n2o-but-not-ch4-emissions-from-constructed-wetlands-under-high-nitrogen-levels
#15
Wenjuan Han, Mengmeng Shi, Jie Chang, Yuan Ren, Ronghua Xu, Chongbang Zhang, Ying Ge
Constructed wetlands (CWs) have been widely used for treating wastewater. CWs also are the sources of greenhouse gas (GHG) due to high pollutant load. It has been reported that plant species diversity can enhance nitrogen (N) removal efficiency in CWs for treating wastewater. However, the influence of plant species diversity on GHG emissions from CWs in habitats with high N levels still lack research. This study established four species richness levels (1, 2, 3, 4) and 15 species compositions by using 75 simulated vertical flow CWs microcosms to investigate the effects of plant species diversity on the GHG emissions and N removal efficiency of CWs with a high N level...
January 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28070305/calling-at-the-highway-the-spatiotemporal-constraint-of-road-noise-on-pacific-chorus-frog-communication
#16
Danielle V Nelson, Holger Klinck, Alexander Carbaugh-Rutland, Codey L Mathis, Anita T Morzillo, Tiffany S Garcia
Loss of acoustic habitat due to anthropogenic noise is a key environmental stressor for vocal amphibian species, a taxonomic group that is experiencing global population declines. The Pacific chorus frog (Pseudacris regilla) is the most common vocal species of the Pacific Northwest and can occupy human-dominated habitat types, including agricultural and urban wetlands. This species is exposed to anthropogenic noise, which can interfere with vocalizations during the breeding season. We hypothesized that Pacific chorus frogs would alter the spatial and temporal structure of their breeding vocalizations in response to road noise, a widespread anthropogenic stressor...
January 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28069302/biodegradation-of-the-veterinary-antibiotics-enrofloxacin-and-ceftiofur-and-associated-microbial-community-dynamics
#17
Diogo A M Alexandrino, Ana P Mucha, C Marisa R Almeida, Wei Gao, Zhongjun Jia, Maria F Carvalho
Fluoroquinolones and cephalosporins are two classes of veterinary antibiotics arising as pollutants of emerging concern. In this work, the microbial degradation of two representative antibiotics of both these classes, enrofloxacin (ENR) and ceftiofur (CEF), is reported. Biodegradation of the target antibiotics was investigated by supplementing the culture medium with ENR and CEF, individually and in mixture. Microbial inocula were obtained from rhizosphere sediments of plants derived from experimental constructed wetlands designed for the treatment of livestock wastewaters contaminated with trace amounts of these antibiotics...
January 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28068411/projected-impacts-of-climate-urbanization-water-management-and-wetland-restoration-on-waterbird-habitat-in-california-s-central-valley
#18
Elliott L Matchett, Joseph P Fleskes
The Central Valley of California is one of the most important regions for wintering waterbirds in North America despite extensive anthropogenic landscape modification and decline of historical wetlands there. Like many other mediterranean-climate ecosystems across the globe, the Central Valley has been subject to a burgeoning human population and expansion and intensification of agricultural and urban development that have impacted wildlife habitats. Future effects of urban development, changes in water supply management, and precipitation and air temperature related to global climate change on area of waterbird habitat in the Central Valley are uncertain, yet potentially substantial...
2017: PloS One
https://www.readbyqxmd.com/read/28067640/effects-of-different-substrates-in-the-mitigation-of-algae-induced-high-ph-wastewaters-in-a-pilot-scale-free-water-surface-wetland-system
#19
Meng Jin, Pascale Champagne, Geoffrey Hall
Waste stabilization ponds (WSPs), as part of municipal wastewater treatment strategies, can exhibit variability in performance due to climatic conditions. Under elevated temperature and strong solar radiation, algal blooms and subsequent high pH effluents have often been observed. In this study, four substrates (gravel, peat, organic mulch, and topsoil) were evaluated for their ability to attenuate high pH effluents from a WSP. Synthetic wastewater with pH > 9.5, and low organic and nutrient loadings, was used to mimic algal-induced high pH effluents in 72 L rectangular bench-scale superficial constructed wetland configuration reactors...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28066129/a-multi-year-estimate-of-methane-fluxes-in-alaska-from-carve-atmospheric-observations
#20
Scot M Miller, Charles E Miller, Roisin Commane, Rachel Y-W Chang, Steven J Dinardo, John M Henderson, Anna Karion, Jakob Lindaas, Joe R Melton, John B Miller, Colm Sweeney, Steven C Wofsy, Anna M Michalak
Methane (CH4) fluxes from Alaska and other arctic regions may be sensitive to thawing permafrost and future climate change, but estimates of both current and future fluxes from the region are uncertain. This study estimates CH4 fluxes across Alaska for 2012-2014 using aircraft observations from the Carbon in Arctic Reservoirs Vulnerability Experiment (CARVE) and a geostatistical inverse model (GIM). We find that a simple flux model based on a daily soil temperature map and a static map of wetland extent reproduces the atmospheric CH4 observations at the state-wide, multi-year scale more effectively than global-scale, state-of-the-art process-based models...
October 2016: Global Biogeochemical Cycles
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