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Ze Yu Cai, Jian Feng Zhang, Guang Cai Chen, Han Dan Zhang, Shi Yong Sun, Xiao Gang Li, Guang Hua Qin
Phosphorus is the necessary element for plant growth, and its concentration is one of the main indices for water eutrophication. Hence, it is significant to understand how woody plants purify phosphorus in eutrophic water. The purpose of this study is to reveal the P absorption and removal mechanism of Salix matsudana in eutrophic water with different P concentration. We selected new S. matsudana clone (A42) as experimental material and set three levels of P concentration (low P: 0.1, 0.2 mg·L-1 ; medium P: 1...
October 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Yan Zhang, Guodong Ji, Chen Wang, Xuanrui Zhang, Ming Xu
Excessive nitrogen (N) loadings from human activities have led to increased eutrophication and associated water quality impacts in China's coastal wetlands. Denitrification accounts for significant reduction of inorganic N to nitrous oxide (N2 O) or dinitrogen gas (N2 ), and thereby curtails harmful effects of N pollution in coastal and marine ecosystems. However, the molecular drivers and limiting steps of denitrification in coastal wetlands are not well understood. Here, we quantified the abundances of functional genes involved in N cycling and determined denitrification rates using 15 N paring technique in the coastal wetland sediments of Bohai Economic Rim in eastern China...
October 9, 2018: Environmental Pollution
Lili Dai, Chengqing Liu, Liqin Yu, Chaofeng Song, Liang Peng, Xiaoli Li, Ling Tao, Gu Li
Ammonia-oxidizing bacteria (AOB) and archaea (AOA) play important roles in nitrogen removal in aquaculture ponds, but their distribution and the environmental factors that drive their distribution are largely unknown. In this study, we collected surface sediment samples from Ctenopharyngodon idellus ponds in three different areas in China that practice aquaculture. The community structure of AOB and AOA and physicochemical characteristics in the ponds were investigated. The results showed that AOA were more abundant than AOB in all sampling ponds except one, but sediment AOB and AOA numbers varied greatly between ponds...
2018: Frontiers in Microbiology
E Morrissey-Mccaffrey, S Shephard, F L Kelly, M Kelly-Quinn
This study finds that non-native species and warming temperatures have significant negative effects on Arctic char Salvelinus alpinus abundance in Irish lakes. Eutrophication was not important at the range of total phosphorus tested (0.005-0.023 mg l-1 ). Model results predict that S. alpinus occur across the temperature range sampled (8.2-19.7°C) when non-natives are absent, but S. alpinus catch is predicted to be close to zero irrespective of temperature when non-native catch is high. This result indicates that to persist S...
October 12, 2018: Journal of Fish Biology
Jeffrey R Dwulit-Smith, Joshua J Hamilton, David M Stevenson, Shaomei He, Ben O Oyserman, Francisco Moya-Flores, Sarahi L Garcia, Daniel Amador-Noguez, Katherine D McMahon, Katrina T Forest
Freshwater lakes harbor complex microbial communities, but these ecosystems are often dominated by acI Actinobacteria. Members of this cosmopolitan lineage are proposed to bolster heterotrophic growth using phototrophy because their genomes encode actino-opsins ( actR) This model has been difficult to validate experimentally because acI are not consistently culturable. Based primarily on genomes from single cells and metagenomes, we provide a detailed biosynthetic route for members of acI clades A and B to synthesize retinal and its carotenoid precursors...
October 12, 2018: Applied and Environmental Microbiology
Wenxiu Qin, Yue Gu, Guozhong Wang, Tianxing Wu, Haimin Zhang, Xiaoxian Tang, Yunxia Zhang, Huijun Zhao
In an effort to provide early warnings for the occurrence of eutrophication, it is highly desirable to develop an accurate and efficient technique to ensure continuous monitoring of dissolved reactive phosphorus (DRP) in the aquatic environment from the viewpoint of environmental management. Herein, a new diffusive gradient in thin film (DGT) technique was developed and evaluated for in situ measurement of DRP in waters, in which Zr-based metal organic frameworks (MOFs, UiO-66) were utilized as aqueous binding agent (abbreviated as UiO-66 DGT)...
October 5, 2018: Water Research
Stefan Thiele, Andreas Basse, Jamie W Becker, Andre Lipski, Morten H Iversen, Gesine Mollenhauer
Eastern boundary upwelling systems (EBUSs) are among the most productive marine environments in the world. The Canary Current upwelling system off the coast of Mauritania and Morocco is the second most productive of the four EBUS, where nutrient-rich waters fuel perennial phytoplankton blooms, evident by high chlorophyll a concentrations off Cape Blanc, Mauritania. High primary production leads to eutrophic waters in the surface layers, whereas sinking phytoplankton debris and horizontally dispersed particles form nepheloid layers (NLs) and hypoxic waters at depth...
October 11, 2018: MicrobiologyOpen
Ming Su, Tom Andersen, Michael Burch, Zeyu Jia, Wei An, Jianwei Yu, Min Yang
Subsurface cyanobacterial blooms, are a significant source of odor problems in source water and have been recorded in many oligotrophic/mesotrophic drinking water reservoirs. In this study, we explored the key driving forces responsible for the succession between surface and subsurface cyanobacteria using ecological niche modelling based upon a case study in Miyun Reservoir, China. The results suggest a negative effect of water depth and surface light irradiance (I0 ) on subsurface Planktothrix sp. growth (p-values < 0...
February 1, 2019: Science of the Total Environment
Tingfeng Wu, Boqiang Qin, Justin D Brookes, Wenming Yan, Xiaoyan Ji, Jian Feng
Hydrodynamics play an important role in sediment nutrient dynamics in large shallow eutrophic lakes. In this study, the spatial patterns of sediment nitrogen and phosphorus in Lake Taihu were compared from a hydrodynamics-induced transport perspective based on high-resolution investigation of sediment, field observations, numerical simulations and long-term ecological data analysis. The results showed that sediments were primarily distributed in the west and southeast portions of the lake. Additionally, the total nitrogen (TN) and phosphorus (TP) stored in the active sediments was 166,329 t and 67,112...
February 10, 2019: Science of the Total Environment
Van Biak Luai, Shaobo Ding, Dong Wang
The 'home-field advantage' (HFA) hypothesis states that litter decomposes faster in its 'home' habitat, i.e., in the same habitat as the plant species from which it was derived than it does 'away' from its home, i.e., in the habitat of a different plant species. However, studies pertaining to HFA in aquatic ecosystems are relatively few. One area not well-studied is whether the presence of living plants has an effect on the HFA of aquatic macrophyte decomposition in a eutrophic lake. Here, we conducted reciprocal litter transplanting experiments, coupled with removal of living plants, between a dominant submerged macrophyte (Myriophyllum spicatum) and a floating-leaved macrophyte (Trapa natans) in a eutrophic urban lake in China, for 50 days...
February 10, 2019: Science of the Total Environment
Junli Wang, Zishi Fu, Hongxia Qiao, Fuxing Liu
Our study assessed the actual water situation in the estuarine area of Lake Wuli, Meiliang Bay, Lake Taihu, China, based on eutrophication levels and status of water quality using the trophic level index (TLI) and water quality index (WQI) methods. In the wet (August 2017) and dry (March 2018) seasons, 22 estuarine areas were tested at 69 sampling sites, which included lake and rivers. Five parameters-chlorophyll a (Chl-a), total phosphorus (TP), total nitrogen (TN), Secchi disk (SD) and permanganate index (CODMn )-were measured to calculate the TLI, and 15 parameters-temperature (T), pH, electrical conductivity (EC), dissolved oxygen (DO), total dissolved solids (TDS), TN, TP, ammonium (NH4 -N), nitrate (NO3 -N), nitrite (NO2 -N), CODMn , calcium (Ca2+ ), magnesium (Mg2+ ), chloride (Cl- ) and phosphate (PO4 -P)-were measured to calculate the WQI...
February 10, 2019: Science of the Total Environment
A Budzyńska, J Rosińska, A Pełechata, M Toporowska, A Napiórkowska-Krzebietke, A Kozak, B Messyasz, W Pęczuła, M Kokociński, E Szeląg-Wasielewska, M Grabowska, B Mądrecka, M Niedźwiecki, P Alcaraz Parraga, M Pełechaty, M Karpowicz, B Pawlik-Skowrońska
Cyanobacterial blooms are an increasing threat worldwide. Invasions of certain cyanobacterial species, mainly towards higher latitudes, add to this concern as they enrich the pool of potential bloom-formers in the invaded region. Among the numerous causes of this escalating process, climate warming is commonly considered the most crucial factor, but empirical studies of this issue are lacking. The aim of our study was to identify physical, chemical and biological factors related to the occurrence of an invasive cyanobacterium at the northern border of its putative current range, and thus enabling its expansion...
February 10, 2019: Science of the Total Environment
Adryana Cordeiro, Claudia Bento, Andréa C Matos, Andréa Ramalho
INTRODUCTION: evidence indicates that vitamin A is involved in regulating fat mass. A low consumption of vitamin A has been reported in individuals with obesity, as have lower concentrations of this vitamin, than in eutrophic individuals when their dietary intake of vitamin A is not significantly different. OBJECTIVE: to investigate vitamin A nutritional status and its association with body mass index (BMI) and body fat in women who have the recommended dietary intake of vitamin A...
October 5, 2018: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
Yuki Weber, Jaap S Sinninghe Damsté, Jakob Zopfi, Cindy De Jonge, Adrian Gilli, Carsten J Schubert, Fabio Lepori, Moritz F Lehmann, Helge Niemann
Terrestrial paleoclimate archives such as lake sediments are essential for our understanding of the continental climate system and for the modeling of future climate scenarios. However, quantitative proxies for the determination of paleotemperatures are sparse. The relative abundances of certain bacterial lipids, i.e., branched glycerol dialkyl glycerol tetraethers (brGDGTs), respond to changes in environmental temperature, and thus have great potential for climate reconstruction. Their application to lake deposits, however, is hampered by the lack of fundamental knowledge on the ecology of brGDGT-producing microbes in lakes...
October 9, 2018: Proceedings of the National Academy of Sciences of the United States of America
Cristiane da Silveira Fiori, Ana Paula de Castro Rodrigues, Thatianne Castro Vieira, Elisamara Sabadini-Santos, Edison Dausacker Bidone
We present an alternative approach for establishing in situ bioaccumulation assessment of methyl-Hg (MeHg), total-Hg, Cd, Pb and Zn in bivalve Anomalocardia brasiliana from four bays of Rio de Janeiro presenting varying degrees of eutrophication, acid volatile sulfides (2-55 μmol g-1 ), simultaneously extracted metals (SEM) and total metals (TM) in sediments. Using metal concentrations of composite samples from three size classes of bivalve and their incorporation rates (IR = metal concentration / total length), which depend on exposure time, we calculated asymptotic IR and respective consequent metal concentrations...
October 2018: Marine Pollution Bulletin
Richard M Warwick, James R Tweedley, Ian C Potter
Not all estuaries are equally susceptible to anthropogenic perturbation. Microtidal estuaries with long residence times are intrinsically less robust than well-flushed macrotidal estuaries, facilitating the accumulation of contaminants. This promotes development of blooms of non-toxic and toxic phytoplankton, and hypoxia and anoxia may occur in deeper sections of the typically stratified water column. In Mediterranean and arid climates, high temperatures and low and/or seasonal rainfall can result in marked hypersalinity...
October 2018: Marine Pollution Bulletin
Tomáš Fuksi, Adam Tomašových, Ivo Gallmetzer, Alexandra Haselmair, Martin Zuschin
An increase in the frequency of hypoxia, mucilages, and sediment pollution occurred in the 20th century in the Adriatic Sea. To assess the effects of these impacts on bivalves, we evaluate temporal changes in size structure of the opportunistic bivalve Corbula gibba in four sediment cores that cover the past ~500 years in the northern, eutrophic part and ~10,000 years in the southern, mesotrophic part of the Gulf of Trieste. Assemblages exhibit a stable size structure during the highstand phase but shift to bimodal distributions and show a significant increase in the 95th percentile size during the 20th century...
October 2018: Marine Pollution Bulletin
Anna-Lucia Buer, Greta Gyraite, Patrick Wegener, Xaver Lange, Marija Katarzyte, Gerhard Hauk, Gerald Schernewski
Bathing water quality plays a key role for public health, is highly important for recreational tourism and therefore monitored in the EU-Directive 2006/7/EC. To identify pollution hot spots, sources and impacts of the directive-change in 2006, including a change of indicator organisms, we evaluated monitoring data of the past 15 years, collected own data, determined survival rates of indicator organisms and applied hydrodynamic modelling in a micro-tidal-system. Due to higher survival rates under turbid conditions and restricted water exchange, shallow, eutrophic bays and lagoons are hot spots of microbial pollution...
October 2018: Marine Pollution Bulletin
Refilwe Lukhwareni, Cobus van Dyk
This study aimed to assess the macroscopic appearance, histology and ultrastructure of liver nodular alterations in sharptooth catfish Clarias gariepinus (Burchell, 1822) from a hyper-eutrophic freshwater impoundment. The livers of 25 fish were sampled for microscopy analyses, otoliths were collected for age estimation, and the hepatosomatic index (HSI) was calculated. The light microscopic analysis of the nodular tissue revealed hepatocellular and nuclear pleomorphism, pyknotic nuclei, variation in cytoplasmic appearance and focal areas of cellular alterations (FCAs)...
October 7, 2018: Journal of Fish Diseases
Alejandro Gallego-Schmid, Raphael Ricardo Zepon Tarpani, Sara Miralles-Cuevas, Alejandro Cabrera-Reina, Sixto Malato, Adisa Azapagic
Scarcity of water and concerns about the ecotoxicity of micro-contaminants are driving an interest in the use of advanced tertiary processes in wastewater treatment plants. However, the life cycle environmental implications of these treatments remain uncertain. To address this knowledge gap, this study evaluates through life cycle assessment the following four advanced process options for removal of micro-contaminants from real effluents: i) solar photo-Fenton (SPF) operating at acidic pH; ii) acidic SPF coupled with nanofiltration (NF); iii) SPF operating at neutral pH; and iv) neutral SPF coupled with NF...
October 1, 2018: Science of the Total Environment
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