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https://www.readbyqxmd.com/read/28448934/release-of-dissolved-phosphorus-from-riparian-wetlands-evidence-for-complex-interactions-among-hydroclimate-variability-topography-and-soil-properties
#1
Sen Gu, Gérard Gruau, Rémi Dupas, Cornélia Rumpel, Alexandra Crème, Ophélie Fovet, Chantal Gascuel-Odoux, Laurent Jeanneau, Guillaume Humbert, Patrice Petitjean
In agricultural landscapes, establishment of vegetated buffer zones in riparian wetlands (RWs) is promoted to decrease phosphorus (P) emissions because RWs can trap particulate P from upslope fields. However, long-term accumulation of P risks the release of dissolved P, since the unstable hydrological conditions in these zones may mobilize accumulated particulate P by transforming it into a mobile dissolved P species. This study evaluates how hydroclimate variability, topography and soil properties interact and influence this mobilization, using a three-year dataset of molybdate-reactive dissolved P (MRDP) and total dissolved P (TDP) concentrations in soil water from two RWs located in an agricultural catchment in western France (Kervidy-Naizin), along with stream P concentrations...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448909/changes-in-heavy-metal-mobility-and-availability-from-contaminated-wetland-soil-remediated-with-combined-biochar-compost
#2
Jie Liang, Zhaoxue Yang, Lin Tang, Guangming Zeng, Man Yu, Xiaodong Li, Haipeng Wu, Yingying Qian, Xuemei Li, Yuan Luo
The combination of biochar and compost has been proven to be effective in heavy metals contaminated wetland soil restoration. However, the influence of different proportions between biochar and compost on immobilization of heavy metals in soil has been less studied up to date. Therefore, we investigated the effect of different ratios of biochar-compost mixtures on availability and speciation distribution of heavy metals (Cd, Zn and Cu) in wetland soil. The results showed that applying all amendment combinations into wetland soil increased gradually the total organic carbon (TOC) and water-extract organic carbon (WEOC) as the compost percentage rose in biochar-composts...
April 24, 2017: Chemosphere
https://www.readbyqxmd.com/read/28448719/use-of-native-aquatic-macrophytes-in-the-reduction-of-organic-matter-from-dairy-effluents
#3
Rita de Cássia Souza de Queiroz Lopes, Rodrigo Santos Andrade, Isadora Rosário Dantas, Vinícius de Souza Ribeiro, Luciano Brito Rodrigues Neto, José Adolfo de Almeida Neto
Considering the diversity and the unexplored potential of regional aquatic flora, this study aimed to identify and analyze the potential of native aquatic macrophytes to reduce the organic matter of dairy wastewater using experimental constructed wetlands. The dairy wastewater had an initial average COD of 7,414.63 mg/L and then was diluted to 3,133.16 mg/L (D1) and to 2,506.53 mg/L (D2). Total solids, COD, temperature, and pH analyses were performed, and the BOD was estimated from the COD values. The best performance in the reduction of the organic matter was observed for Polygonum sp...
April 27, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28448169/decolorization-and-mineralization-of-amaranth-dye-using-multiple-zoned-aerobic-and-anaerobic-baffled-constructed-wetland
#4
Harvinder Kaur Lehl, Soon-An Ong, Li-Ngee Ho, Yee-Shian Wong, Farah Naemah Mohd Saad, Yoong-Ling Oon, Yoong-Sin Oon, Wei-Eng Thung, Chin-Yii Yong
The objective of this study is to determine the reduction efficiency of COD as well as the removal of color and Amaranth dye metabolites by the Aerobic-anaerobic Baffled Constructed Wetland Reactor (ABCW). The ABCW reactor was planted with common reed (Phragmite australis) where the HRT was set to 1 day and was fed with synthetic wastewater with the addition of Amaranth dye. Supplementary aeration was supplied in designated compartments of the ABCW reactor to control the aerobic and anaerobic zones. After Amaranth dye addition the COD reduction efficiency dropped from 98% to 91% while the color removal efficiency was 100%...
April 27, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28447395/land-scale-biogeography-of-arsenic-biotransformation-genes-in-estuarine-wetland
#5
Si-Yu Zhang, Jian-Qiang Su, Guo-Xin Sun, Yunfeng Yang, Yi Zhao, Junjun Ding, Yong-Shan Chen, Yu Shen, Guibing Zhu, Christopher Rensing, Yong-Guan Zhu
As an analog of phosphorus, arsenic (As) has a biogeochemical cycle coupled closely with other key elements on the Earth, such as iron, sulfate and phosphate. It has been documented that microbial genes associated with As biotransformation are widely present in As-rich environments. Nonetheless, their presence in natural environment with low As levels remains unclear. To address this issue, we investigated the abundance levels and diversities of aioA, arrA, arsC and arsM genes in estuarine sediments at low As levels across Southeastern China to uncover biogeographic patterns at a large spatial scale...
April 26, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28447044/molecular-and-phylogenetic-characterization-of-thelohanellus-boggoti-qadri-1962-cnidaria-myxosporea-bivalvulida-infecting-the-fin-of-indian-minor-carp-labeo-dero-hamilton-1822
#6
Harpreet Kaur, Aditya Gupta
A myxozoan parasite belonging to the genus Thelohanellus Kudo, 1933 (Cnidaria, Myxosporea, Bivalvulida) was isolated from the fins of Labeo dero inhabiting Ranjit Sagar Wetland, Punjab, India. The plasmodium was 0.5-0.7 mm in diameter each containing 80- 100 number of myxospores. Myxospores were egg shaped to ovoidal in valvular view having bluntly pointed anterior and broad rounded posterior end measuring 8.36x 4.77 µm. Polar capsule was single, broadly pyriform in shape, measuring 4.77x3.98 µm in size containing a polar filament coiled perpendicular to the longitudinal axis of myxospore body making 7-9 turns...
March 2017: Molecular Biology Research Communications
https://www.readbyqxmd.com/read/28440932/microplastics-in-a-freshwater-environment-receiving-treated-wastewater-effluent
#7
Steven Lasee, Jessica Mauricio, William A Thompson, Adcharee Karnjanapiboonwong, John Kasumba, Seenivasan Subbiah, Audra N Morse, Todd A Anderson
Small plastic fragments (microplastics or solid particles <5 mm in size or "microbeads" used in personal care products and cosmetics) may ultimately find their way into aquatic environments. We studied the presence of microplastics (particle sizes 53-105 μm and 106-179 μm) spatially and temporally in 3 connected urban lakes being fed by treated wastewater effluent in Lubbock, Texas. These lakes also serve as drainage during storm events. Water samples from drainage playa wetlands within the city were also collected...
May 2017: Integrated Environmental Assessment and Management
https://www.readbyqxmd.com/read/28440628/edaphic-conditions-regulate-denitrification-directly-and-indirectly-by-altering-denitrifier-abundance-in-wetlands-along-the-han-river-china
#8
Ziqian Xiong, Laodong Guo, Quanfa Zhang, Guihua Liu, Wenzhi Liu
Riparian wetlands play a critical role in retaining nitrogen (N) from upland runoff and improving river water quality, mainly through biological processes such as soil denitrification. However, the relative contribution of abiotic and biotic factors to riparian denitrification capacity remains elusive. Here we report the spatio-temporal dynamics of potential and unamended soil denitrification rates in 20 wetlands along the Han River, an important water source in central China. We also quantified the abundance of soil denitrifying microorganisms using nirK and nirS genes...
April 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28438915/conservation-development-and-the-management-of-infectious-disease-avian-influenza-in-china-2004-2012
#9
Tong Wu, Charles Perrings
There is growing evidence that wildlife conservation measures have mixed effects on the emergence and spread of zoonotic disease. Wildlife conservation has been found to have both positive (dilution) and negative (contagion) effects. In the case of avian influenza H5N1 in China, the focus has been on negative effects. Lakes and wetlands attracting migrating waterfowl have been argued to be disease hotspots. We consider the implications of waterfowl conservation for H5N1 infections in both poultry and humans between 2004 and 2012...
June 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28438081/long-term-operation-of-kickuth-type-constructed-wetland-applied-to-municipal-wastewater-treatment-in-temperate-climate
#10
Zbigniew Mucha, Włodzimierz Wójcik, Krzysztof Jóźwiakowski, Magdalena Gajewska
The purpose of this paper is to discuss the problem of changes of effectiveness of Kickuth-type constructed wetland with subsurface flow applied to domestic wastewater treatment. This study is based on an example of a wetland 3000 sq. meters in surface, serving 800 inhabitants, located in Poland. The results of chemical analysis showed that after an initial year of 'start-up time', the efficiency of pollutant removal gradually increased to reach an apex in the 6(th) year of operation. Such maximum efficiency continued up to the 10(th) year of operation, afterwards it was gradually dropping...
April 25, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28436685/factors-affecting-the-performance-of-horizontal-flow-constructed-treatment-wetland-vegetated-with-cyperus-papyrus-for-municipal-wastewater-treatment
#11
Sohair I Abou-Elela, Mohamed A Elekhnawy, Magdy T Khalil, Mohamed S Hellal
The effect of hydraulic loading rate (HLR) and hydraulic retention time (HRT) on the bioremediation of municipal wastewater using a pilot scale subsurface horizontal flow constructed treatment wetland (HFCTW) vegetated with Cyprus papyrus was investigated. Three different HLRs were applied to the treatment system namely; 0.18, 0.10 and 0.07 m(3)/m(2). d with corresponding HRTs of 1.8, 3.2 and 4.7 days, respectively. The flow rate was 8 m(3)/ d and the average organic loading rate (OLR) was 0.037 kg BOD/m(3)/d...
April 24, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28434669/diurnal-variation-of-co2-ch4-and-n2o-emission-fluxes-continuously-monitored-in-situ-in-three-environmental-habitats-in-a-subtropical-estuarine-wetland
#12
Wen-Bin Yang, Chung-Shin Yuan, Chuan Tong, Pin Yang, Lei Yang, Bang-Qin Huang
Wetlands play a crucial role in modulating atmospheric concentrations of greenhouse gases (GHGs) such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). The key factors controlling GHG emission from subtropical estuarine wetlands were investigated in this study, which continuously monitored the uptake/emission of GHGs (CO2, CH4, and N2O) by/from a subtropical estuarine wetland located in the Minjiang estuary in the coastal region of southeastern China. A self-designed floating chamber was used to collect air samples on-site at three environmental habitats (Phragmites australis marsh, mudflats, and river water)...
April 20, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28432565/parapharyngodon-hugoi-n-sp-a-new-nematode-oxyuroidea-pharyngodonidae-of-the-tree-frog-trachycephalus-typhonius-linnaeus-from-the-brazilian-pantanal-including-a-key-to-the-congeners-from-amphibians-of-the-american-continent
#13
Felipe B Pereira, Karla M Campião, José L Luque, Luiz E R Tavares
A new nematode Parapharyngodon hugoi n. sp. (Oxyuroidea: Pharyngodonidae) is described parasitising the large intestine of the tree frog Trachycephalus typhonius (Linnaeus) (Anura: Hylidae) from the wetlands of Pantanal, State of Mato Grosso do Sul, Brazil. The new species exhibits a unique structure of the posterior cloacal lip in males, which is supported by a rigid V-shaped structure. Parapharyngodon hylidae parasitic in hylid frogs, including T. typhonius, from Mexico, is the most similar congener to P...
April 21, 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28432292/created-mangrove-wetlands-store-belowground-carbon-and-surface-elevation-change-enables-them-to-adjust-to-sea-level-rise
#14
Ken W Krauss, Nicole Cormier, Michael J Osland, Matthew L Kirwan, Camille L Stagg, Janet A Nestlerode, Marc J Russell, Andrew S From, Amanda C Spivak, Darrin D Dantin, James E Harvey, Alejandro E Almario
Mangrove wetlands provide ecosystem services for millions of people, most prominently by providing storm protection, food and fodder. Mangrove wetlands are also valuable ecosystems for promoting carbon (C) sequestration and storage. However, loss of mangrove wetlands and these ecosystem services are a global concern, prompting the restoration and creation of mangrove wetlands as a potential solution. Here, we investigate soil surface elevation change, and its components, in created mangrove wetlands over a 25 year developmental gradient...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28431762/effects-of-a-common-insecticide-on-wetland-communities-with-varying-quality-of-leaf-litter-inputs
#15
A B Stoler, B M Mattes, W D Hintz, D K Jones, L Lind, M S Schuler, R A Relyea
Chemical contamination of aquatic systems often co-occurs with dramatic changes in surrounding terrestrial vegetation. Plant leaf litter serves as a crucial resource input to many freshwater systems, and changes in litter species composition can alter the attributes of freshwater communities. However, little is known how variation in litter inputs interacts with chemical contaminants. We investigated the ecological effects resulting from changes in tree leaf litter inputs to freshwater communities, and how those changes might interact with the timing of insecticide contamination...
April 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28430996/asymmetric-hybridization-in-cattails-typha-spp-and-its-implications-for-the-evolutionary-maintenance-of-native-typha-latifolia
#16
Sara J Pieper, Allison A Nicholls, Joanna R Freeland, Marcel E Dorken
Cattails (Typha spp.) have become an increasingly dominant component of wetlands in eastern North America and this dominance is largely attributable to the high frequency of Typha × glauca, the hybrid of native T. latifolia and putatively introduced T. angustifolia. Hybridization in this group is asymmetric, with T. angustifolia nearly always the maternal parent of F1 hybrids. However, the magnitude of hybrid infertility and whether mating asymmetries extend to the formation of advanced-generation hybrids have not been examined...
April 19, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/28430425/environmental-growth-of-enterococci-and-escherichia-coli-in-feedlot-catch-basins-and-a-constructed-wetland-in-the-absence-of-fecal-input
#17
Lisa Tymensen, Calvin W Booker, Sherry J Hannon, Shaun R Cook, Rahat Zaheer, Ron Read, Tim A McAllister
Population structures of fecal indicator bacteria (FIB) isolated from catch basins, a constructed wetland, and feces from a beef cattle feedlot were compared over a two-year period. Enterococcus hirae accounted for 92% of the fecal isolates, whereas secondary environments were characterized by greater relative abundance of environmentally adapted species including Enterococcus casseliflavus. While enterococci densities in the catch basins and wetland were similar under wet and drought conditions, E. hirae predominated during rainy periods while E...
April 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28423079/the-partitioning-of-food-resources-between-two-rodents-in-the-subtropical-region-of-southern-brazil
#18
Fábio P Espinelli, Fabiano Corrêa, Elton P Colares, Ioni G Colares
The capybara (Hydrochoerus hydrochaeris) and nutria (Myocastor coypus) are herbivorous semi-aquatic rodents. Although these rodents occur in sympatry in southern South America, little is known about how the two species interact in relationship to food resources. In this context, the aim of this study was to analyze the food resource overlap, the feeding strategy and the diversity of the diet of capybaras and nutria. A micro-histological analysis of feces was used to study the diets. A total of 48 plant species belonging to 10 families were identified in the diet of H...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28422982/assessment-ecological-risk-of-heavy-metal-caused-by-high-intensity-land-reclamation-in-bohai-bay-china
#19
Gaoru Zhu, Zhenglei Xie, Tuoyu Li, Zongwen Ma, Xuegong Xu
The article examines the detailed spatial and temporal distributions of coastal reclamation in the northwest coast of Bohai Bay experiencing rapid coastal reclamation in China from 1974 to 2010 in annual intervals. Moreover, soil elements properties and spatial distribution in reclaimed area and inform the future coastal ecosystems management was also analyzed. The results shows that 910.7 km2 of coastal wetlands have been reclaimed and conversed to industrial land during the past 36 years. It covers intertidal beach, shallow sea and island with a percentage of 76...
2017: PloS One
https://www.readbyqxmd.com/read/28421268/using-a-population-model-to-inform-the-management-of-river-flows-and-invasive-carp-cyprinus-carpio
#20
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
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