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eutrophication

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https://read.qxmd.com/read/30763858/application-of-mass-balance-modelling-to-assess-the-effects-of-ecological-restoration-on-energy-flows-in-a-subtropical-reservoir-china
#1
Sai Wang, Lin Wang, Yu Zheng, Zhong-Bing Chen, Yang Yang, Hsing-Juh Lin, Xiao-Qin Yang, Tuan-Tuan Wang
Eutrophication is a leading cause of impairment of lentic water bodies throughout the world. To inhibit algal blooms and remove excess nutrients, a 10,000 m2 restoration project consisting of vegetation establishment and fish manipulation was conducted in the eutrophic bay of the Yantian Reservoir, southern China. Three Ecopath models were constructed to assess the recovery effects at an ecosystem level, and time series data were simulated to propose a fishery policy. During the restoration, 1) the redundant primary production flowing back to detritus decreased due to the increased predation of four stocked fish with different feeding habits; 2) the transfer efficiencies (TEs) through trophic levels increased due to the reinforced energy flows along the planktivorous, herbivorous, and molluscivorous food chains; 3) the groups that had the highest keystoneness shifted from carnivorous fish to invertivorous fish and omnivorous shrimp, indicating the shift of mixed trophic impacts from top-down to wasp-waist control; and 4) the changing indices of path length, flow fluxes, matter cycling, and network information showed that the restored system was more mature, developed, and organized than before...
January 28, 2019: Science of the Total Environment
https://read.qxmd.com/read/30763352/sediment-potentially-controls-in-lake-phosphorus-cycling-and-harmful-cyanobacteria-in-shallow-eutrophic-utah-lake
#2
Matthew C Randall, Gregory T Carling, Dylan B Dastrup, Theron Miller, Stephen T Nelson, Kevin A Rey, Neil C Hansen, Barry R Bickmore, Zachary T Aanderud
Lakes worldwide are impacted by eutrophication and harmful algal or cyanobacteria blooms (HABs) due to excessive nutrients, including legacy P released from sediments in shallow lakes. Utah Lake (northern Utah, USA) is a shallow lake with urban development primarily on the east side of the watershed, providing an opportunity to evaluate HABs in relation to a gradient of legacy sediment P. In this study, we investigated sediment composition and P concentrations in sediment, pore water, and the water column in relation to blooms of harmful cyanobacteria species...
2019: PloS One
https://read.qxmd.com/read/30761647/half-a-century-of-multiple-anthropogenic-stressors-has-altered-northern-forest-understory-plant-communities
#3
Per-Ola Hedwall, Lena Gustafsson, Jörg Brunet, Matts Lindbladh, Anna-Lena Axelsson, Joachim Strengbom
Boreal forests form the largest and least disturbed forest biome in the northern hemisphere. However, anthropogenic pressure from intensified forest management, eutrophication and climate change may alter the ecosystem functions of understory vegetation and services boreal forests provide. Swedish forests span long gradients of climate, nitrogen deposition, and management intensity. This makes them ideal to study how the species composition and functions of other, more pristine, boreal forests might change under increased anthropogenic pressure...
February 14, 2019: Ecological Applications: a Publication of the Ecological Society of America
https://read.qxmd.com/read/30758470/alveolar-bone-pattern-and-salivary-leptin-levels-among-premenopausal-obese-women
#4
Silvia Helena de Carvalho Sales-Peres, Francisco Carlos Groppo, Rafaela Carolina Soares Bonato, Matheus de Carvalho Sales-Peres, Francisco Haiter-Neto, Elinton Adami Chaim
BACKGROUND: Systemic bone loss may lead to more severe periodontal destruction, decreasing local bone mineral density. AIM: A cross-sectional designed was performed to study associations among alveolar bone pattern, salivary leptin concentrations, and clinical periodontal status in premenopausal obese and eutrophic women. METHODS: Thirty morbid obese (G1) and 30 normal-weight (G2) women were included. Anthropometric and periodontal measurements (probing depth - PD, clinical attachment levels - CAL, presence of calculus, bleeding on probing -BOP, and plaque accumulation) were assessed...
February 7, 2019: Arquivos Brasileiros de Cirurgia Digestiva: ABCD, Brazilian Archives of Digestive Surgery
https://read.qxmd.com/read/30755829/species-turnover-reveals-hidden-effects-of-decreasing-nitrogen-deposition-in-mountain-hay-meadows
#5
Tobias Roth, Lukas Kohli, Christoph Bühler, Beat Rihm, Reto Giulio Meuli, Reto Meier, Valentin Amrhein
Nitrogen (N) deposition is a major threat to biodiversity in many habitats. The recent introduction of cleaner technologies in Switzerland has led to a reduction in the emissions of nitrogen oxides, with a consequent decrease in N deposition. We examined different drivers of plant community change, that is, N deposition, climate warming, and land-use change, in Swiss mountain hay meadows, using data from the Swiss biodiversity monitoring program. We compared indicator values of species that disappeared from or colonized a site (species turnover) with the indicator values of randomly chosen species from the same site...
2019: PeerJ
https://read.qxmd.com/read/30754009/dynamics-of-bacterial-community-in-tonle-sap-lake-a-large-tropical-flood-pulse-system-in-southeast-asia
#6
Porsry Ung, Chanthol Peng, Sokunsreiroat Yuk, Reasmey Tan, Vannak Ann, Kazuhiko Miyanaga, Yasunori Tanji
Tonle Sap Lake, the largest freshwater body in Southeast Asia, plays an important role in lives and environment. The lake is reportedly under anthropogenic pressure and suffers from eutrophication. The floating villagers suffer from waterborne diseases. However, the shift in bacterial community due to human activities in this great lake has not yet been reported. We aimed to determine the dynamics of the bacterial community and their concentration in the lake using 67 surface waters, 53 sub-layer waters and 59 sediment samples by Next Generation Sequencing (NGS)...
February 4, 2019: Science of the Total Environment
https://read.qxmd.com/read/30743943/modelling-environmental-impacts-of-treated-municipal-wastewater-reuse-for-tree-crops-irrigation-in-the-mediterranean-coastal-region
#7
M Moretti, S Van Passel, S Camposeo, F Pedrero, T Dogot, P Lebailly, G A Vivaldi
Wastewater reuse provides valuable solutions to solve the societal challenges of decreasing availability and limiting access to secure water resources. The present study quantifies the environmental performance of nectarine orchards irrigation using treated municipal wastewater (TMW) and surface water using a unique dataset based on field experimental data. Climate change, toxicity (for human and freshwater), eutrophication (marine and freshwater) and acidification impacts were analysed using the impact assessment method suggested by the International Reference Life Cycle Data System (ILCD)...
April 10, 2019: Science of the Total Environment
https://read.qxmd.com/read/30743930/water-quality-and-phytoplankton-structure-changes-under-the-influence-of-effective-microorganisms-em-and-barley-straw-lake-restoration-case-study
#8
Renata Dondajewska, Anna Kozak, Joanna Rosińska, Ryszard Gołdyn
Many lakes worldwide, especially shallow, experience great changes due to eutrophication, manifested in severe, usually toxic water blooms, disqualifying them from recreation. In order to improve water quality, restoration programs are implemented, including numerous methods. Intense nutrient cycling resulting from detrimental role of sediments impede obtaining of clear water state. One of the restoration methods proposed in recent years was Effective Microorganisms (EM), i.e. the set of microorganisms aiming at the inhibition of harmful bacteria through competitive exclusion...
April 10, 2019: Science of the Total Environment
https://read.qxmd.com/read/30743119/environmental-impact-of-strawberry-production-in-italy-and-switzerland-with-different-cultivation-practices
#9
Daniele Valiante, Ilaria Sirtori, Stefano Cossa, Luca Corengia, Martina Pedretti, Luca Cavallaro, Lorenzo Vignoli, Andrea Galvagni, Stefano Gomarasca, Gaetano Roberto Pesce, Alessandro Boccardelli, Luigi Orsi, Daniela Lovarelli, Davide Facchinettii, Domenico Pessina, Jacopo Bacenetti
In this study, the environmental impact of strawberry production in Italy and Switzerland was evaluated using the Life Cycle Assessment (LCA) approach. The main differences between the two countries are the cultivation practices: crop cycle duration (1 year in Switzerland and 2 or 3 years in Italy), soil management and cultivation in open and protected fields. For all the environmental impact categories evaluated with LCA, strawberry production in Switzerland shows higher impacts respect to the Italian production...
February 4, 2019: Science of the Total Environment
https://read.qxmd.com/read/30739865/n-and-p-runoff-losses-in-china-s-vegetable-production-systems-loss-characteristics-impact-and-management-practices
#10
Rui Wang, Ju Min, Herbert J Kronzucker, Yilin Li, Weiming Shi
Vegetable production systems involve the use of high rates of fertilizer application, leading to significant losses of nitrogen (N) and phosphorus (P) to the environment, resulting in water body eutrophication through surface runoff and leaching. We here quantify, at the national level, total N and P runoff losses and the key factors controlling runoff in open-field vegetable systems in China, by summarizing data from 151 publications pertaining to 13 Chinese provinces using literature dating back to 1990. Rank analysis was employed to clarify the impact of N and P runoff losses in vegetable systems, and different strategies for controlling N and P entering into water bodies are being compared...
January 30, 2019: Science of the Total Environment
https://read.qxmd.com/read/30739860/multidimensional-analysis-of-environmental-impacts-from-potato-agricultural-production-in-the-peruvian-central-andes
#11
D Grados, E Schrevens
Rain-fed potato systems, being the most important cash crop in the Peruvian Central Andes, play a key role in food security. Quantifying the environmental impacts and understanding their complex interactions is an important step towards an improvement of the technical sustainability of these systems. From 2005 until 2015, 58 potato field plots located on a transect of Mantaro Valley, Junín, Peru were investigated at field level during the rainy cropping seasons. All external inputs used for crop production were measured and registered on fortnightly basis...
January 31, 2019: Science of the Total Environment
https://read.qxmd.com/read/30739365/color-chlorophyll-a-and-suspended-solids-effects-on-secchi-depth-in-lakes-implications-for-trophic-state-assessment
#12
Patrick L Brezonik, R William Bouchard, Jacques C Finlay, Claire G Griffin, Leif G Olmanson, Jesse P Anderson, William A Arnold, Raymond Hozalski
Two other optically related water quality variables also directly affect SD: non-algal suspended solids (SSNA ) and colored dissolved organic matter (CDOM, expressed as the absorption coefficient at 440 nm, a440 ). Using a database of ~ 1460 samples from ~ 625 inland lake basins in Minnesota and two other Upper Midwest states, Wisconsin and Michigan, we analyzed relationships among these variables, with special focus on CDOM levels that influence SD values and the Minnesota SD standards used to assess eutrophication impairment of lakes...
February 10, 2019: Ecological Applications: a Publication of the Ecological Society of America
https://read.qxmd.com/read/30739021/soil-erosion-as-a-source-of-sediment-and-phosphorus-in-rivers-and-reservoirs-watershed-analyses-using-watem-sedem
#13
Josef Krasa, Tomas Dostal, Barbora Jachymova, Miroslav Bauer, Jan Devaty
Spatially distributed modelling of sediment and phosphorus fluxes on a scale of thousands of square kilometers always involves a compromise between the quality of the data input and the complexity of the model that can be applied. WaTEM/SEDEM offers an approach that allows us to target on spatially focused outputs that can easily be implemented in the decision-making process for effective watershed control. The results for a study area covering the watersheds of 58 large reservoirs threatened by eutrophication within the Czech Republic are presented here as an example of the available analyses...
January 28, 2019: Environmental Research
https://read.qxmd.com/read/30738269/hydrogeological-modelling-for-the-watershed-management-of-the-mar-menor-coastal-lagoon-spain
#14
Andrés Alcolea, Sergio Contreras, Johannes E Hunink, José Luis García-Aróstegui, Joaquín Jiménez-Martínez
The Mar Menor is the largest lagoon along the Spanish Mediterranean coast. It suffers from eutrophication and algal blooms associated with intensive agricultural activities and urban pressure in the surrounding Campo de Cartagena plain. A balanced discharge of groundwater, carrier of algal nutrients such as nitrate, is essential to ensure the integrity of the coastal lagoon and the availability of groundwater resources inland. We here present a 3D hydrogeological model of the unconfined Quaternary aquifer that discharges into the lagoon...
January 29, 2019: Science of the Total Environment
https://read.qxmd.com/read/30738257/pollution-levels-of-stormwater-discharges-and-resulting-environmental-impacts
#15
Sarah Brudler, Martin Rygaard, Karsten Arnbjerg-Nielsen, Michael Zwicky Hauschild, Christian Ammitsøe, Luca Vezzaro
Stormwater carries pollutants that potentially cause negative environmental impacts to receiving water bodies, which can be quantified using life cycle impact assessment (LCIA). We compiled a list of 20 metals, almost 300 organic compounds, and nutrients potentially present in stormwater, and measured concentrations reported in literature. We calculated mean pollutant concentrations, which we then translated to generic impacts per litre of stormwater discharged, using existing LCIA characterisation factors...
January 30, 2019: Science of the Total Environment
https://read.qxmd.com/read/30738174/mitochondrial-related-gene-associated-to-obesity-can-be-modulated-by-in-utero-hyperglycemic-environment
#16
Maruhen A D Silveira, João Paulo C Marcondes, Juliana R Lara, Wellerson R Scarano, Iracema M P Calderón, Marilza V C Rudge, Daisy M F Salvadori
We investigated whether mitochondrial-related genes and proteins are modulated by hyperglycemia promoted by gestational diabetes (GDM), thereby increasing neonate obesity predisposition. 19 healthy pregnant women, 16 pregnant women with GDM and their respective neonates were enrolled. Additionally, 19 obese and 19 eutrophic adults were recruited as a reference population. Umbilical cord, peripheral blood and placental (villous and decidua) tissues were collected to evaluate SOD2, PPAR-α and PPARGC-1β and their respective protein expressions...
February 6, 2019: Reproductive Toxicology
https://read.qxmd.com/read/30737570/wastewater-discharge-with-phytoplankton-may-favor-cyanobacterial-development-in-the-main-drinking-water-supply-river-in-uruguay
#17
H Olano, F Martigani, A Somma, L Aubriot
The main drinking water source supplying Uruguay (Santa Lucía River, SLR) was threatened in 2013 by a cyanobacterial bloom transported downstream to the water treatment plant that provides water to half of this country population. Several eutrophic reservoirs and stabilization ponds located in the river basin may have been the source of cyanobacterial populations. Such conditions may be common in productive basins; however, few studies have evaluated the impact of microalgae from wastewater stabilization ponds on rivers and its viability downstream...
February 9, 2019: Environmental Monitoring and Assessment
https://read.qxmd.com/read/30735950/effect-of-phosphate-concentration-anions-heavy-metals-and-organic-matter-on-phosphate-adsorption-from-wastewater-using-anodized-iron-oxide-nanoflakes
#18
Muhammad Naveed Afridi, Won-Hee Lee, Jong-Oh Kim
Phosphorus is a necessary nutrient for the growth and survival of living beings. Nevertheless, an oversupply of phosphorus in wastewater results in eutrophication. Therefore, its removal from wastewater is important. However, coexisting components, such as anions, heavy metals, and organic matter, might inhibit the phosphate-adsorption mechanism by competing for the active surface sites of the adsorbent. In this study, iron oxide nanoflakes (INFs) were fabricated on iron foil via anodization. The rate of phosphate adsorption from wastewater onto INFs in the presence of three different coexisting components-anions, heavy metals, and organic matter-was evaluated...
January 31, 2019: Environmental Research
https://read.qxmd.com/read/30725059/-characterization-of-celiac-disease-in-chilean-public-hospitals
#19
Constanza Méndez, Mario Carrasco, Betty Mora, Magdalena Araya
INTRODUCTION: The worldwide prevalence of celiac disease (CD) is ~1% of the population. In Chile, the National Health Survey 2009-2010 showed a serological prevalence in individuals older than 15 years of 0.76% (IgA-tTG2), which corresponded in Concepción to 0.6%. OBJECTIVE: Determine cli nical characteristics, search, diagnosis, treatment and follow-up of CD in the two public hospitals in Concepción that have a Gastroenterology Department. PATIENTS AND METHOD: Descriptive study...
December 2018: Revista Chilena de Pediatría
https://read.qxmd.com/read/30716627/interaction-between-carbon-dioxide-emissions-and-eutrophication-in-a-drinking-water-reservoir-a-three-dimensional-ecological-modeling-approach
#20
Zhonghan Chen, Ping Huang, Zhou Zhang
We developed a three-dimensional model to study the dynamics of carbon dioxide (CO2 ) emission from a subtropical drinking water reservoir. The quantitative effects of dissolved CO2 concentration on phytoplankton growth were coupled in an inorganic carbon module. Water quality monitoring was carried out to calibrate and validate the model. The simulated surface CO2 concentrations showed no significant difference between seasons (p > 0.05). Regarding the spatial distribution, high CO2 concentrations were observed in the inflow and dam regions (p < 0...
January 29, 2019: Science of the Total Environment
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