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https://read.qxmd.com/read/30763352/sediment-potentially-controls-in-lake-phosphorus-cycling-and-harmful-cyanobacteria-in-shallow-eutrophic-utah-lake
#1
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/30746942/spatiotemporal-dimensions-of-water-stress-accounting-incorporating-groundwater-surface-water-interactions-and-ecological-thresholds
#2
Sara Alian, Alex S Mayer, Ann Maclean, David Watkins, Ali Mirchi
Coarse temporal (i.e., annual) and spatial (i.e., watershed) scales camouflage water stress associated with withdrawals from surface water and groundwater sources. To address this "curse of scale", we developed a framework to characterize water stress at different time scales and at fine spatial scales that have not been explored before. Our framework incorporates surface water-groundwater interactions by accounting for spatially cumulative consumptive and non-consumptive use impacts and associated changes in flow due to depletion and return flow along stream networks...
February 12, 2019: Environmental Science & Technology
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
#3
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/30738110/comparison-of-two-dna-extraction-methods-widely-used-in-aquatic-microbial-ecology
#4
Erick Mateus-Barros, Aylan K Meneghine, Inessa Lacativa Bagatini, Camila C Fernandes, Luciano T Kishi, Armando A H Vieira, Hugo Sarmento
In recent years, the rapid advances of culture-independent methods and new molecular tools have revolutionized our understanding of microbial biodiversity and ecological functions. DNA extraction from microbial communities is a critical step in this process and several methods have been proposed and used, but the influence of the extraction method on the outcome and ultimately on ecological inferences from the results is not yet precisely determined. Here, we compared two of the most commonly used extraction methods in aquatic microbial ecology, and investigated whether the two methods yielded comparable results for community ecology analyses...
February 6, 2019: Journal of Microbiological Methods
https://read.qxmd.com/read/30713364/biomonitoring-using-invasive-species-in-a-large-lake-dreissena-distribution-maps-hypoxic-zones
#5
Alexander Y Karatayev, Lyubov E Burlakova, Knut Mehler, Serghei A Bocaniov, Paris D Collingsworth, Glenn Warren, Richard T Kraus, Elizabeth K Hinchey
Due to cultural eutrophication and global climate change, an exponential increase in the number and extent of hypoxic zones in marine and freshwater ecosystems has been observed in the last few decades. Hypoxia, or low dissolved oxygen (DO) concentrations, can produce strong negative ecological impacts and, therefore, is a management concern. We measured biomass and densities of Dreissena in Lake Erie, as well as bottom DO in 2014 using 19 high frequency data loggers distributed throughout the central basin to validate a three-dimensional hydrodynamic-ecological lake model...
August 2018: Journal of Great Lakes Research
https://read.qxmd.com/read/30708301/eutrophication-influences-methanotrophic-activity-abundance-and-community-structure-in-freshwater-lakes
#6
Yuyin Yang, Jianfei Chen, Tianli Tong, Baoqin Li, Tao He, Yong Liu, Shuguang Xie
Lake is an important natural source of methane, a potential greenhouse gas, in the atmosphere. Aerobic methanotrophs can consume a notable proportion of the methane produced in lacustrine ecosystems. However, previous studies mainly focused on aerobic methanotrophs in deep and oligotrophic lakes, while little is known about these organisms in shallow and eutrophic lakes. Lake eutrophication leads to more abundant substrates for methanogenesis, and a subsequent higher methane flux. Therefore, the methanotrophs in eutrophic lakes might play a more important role in mediating lacustrine methane emission...
January 25, 2019: Science of the Total Environment
https://read.qxmd.com/read/30696036/the-hydraulic-driving-mechanisms-of-cyanobacteria-accumulation-and-the-effects-of-flow-pattern-on-ecological-restoration-in-lake-dianchi-caohai
#7
Peng Zhang, Rui-Feng Liang, Peng-Xiao Zhao, Qing-Yuan Liu, Yong Li, Kai-Li Wang, Ke-Feng Li, Ying Liu, Peng Wang
Due to rapid increases in socioeconomic development and the human population over the past few decades, the shallow lakes in China have suffered from eutrophication and poor water quality. The conditions in Lake Dianchi Caohai, which is in the northern part of Lake Dianchi, are considered the most serious. The ecological restoration of Lake Dianchi Caohai began in the late 1980s. Lake managers and the public have been puzzled by the lack of a significant response of the water quality to the flow pattern despite the tremendous investment in water quality improvements...
January 28, 2019: International Journal of Environmental Research and Public Health
https://read.qxmd.com/read/30690378/effects-of-hairy-crab-breeding-on-drinking-water-quality-in-a-shallow-lake
#8
Hongbo Liu, Cegan Fu, Genbao Ding, Yueying Fang, Yunbo Yun, Stefan Norra
The Yangcheng Lake, connected to Taihu, is partly served as drinking water source for Suzhou, China; the temporal and spatial changes of water quality parameters of it are investigated in this study. The Yangcheng Middle Lake with aquaculture area and the Yangcheng East Lake with important water intake are chosen to make a comparative investigation of the relationship between crab breeding and water quality. Phytoplankton community and the composition of dissolved organic matters (DOM) at different areas of the Yangcheng Lake are characterized with spectral fluorescence signatures...
December 26, 2018: Science of the Total Environment
https://read.qxmd.com/read/30690216/daily-pco-2-and-co-2-flux-variations-in-a-subtropical-mesotrophic-shallow-lake
#9
Rongjie Yang, Zhen Xu, Shiliang Liu, Y Jun Xu
Carbon dioxide (CO2 ) emissions from lakes have been proven to be an important component of the continental carbon balance, but most CO2 evasion estimates ignore daily variability of partial pressure of CO2 (pCO2 ). To discern the variability of pCO2 and its effect on CO2 outgassing estimations, we conducted in-situ biweekly pCO2 measurements during daylight from November 2017 to June 2018 at 7:00, 10:00, 14:00, and 17:00 Central Standard Time of the United States (CST) in a subtropical shallow lake in Louisiana, USA...
January 20, 2019: Water Research
https://read.qxmd.com/read/30689286/dark-aerobic-sulfide-oxidation-by-anoxygenic-phototrophs-in-anoxic-waters
#10
Jasmine S Berg, Petra Pjevac, Tobias Sommer, Caroline R T Buckner, Miriam Philippi, Philipp F Hach, Manuel Liebeke, Moritz Holtappels, Francesco Danza, Mauro Tonolla, Anupam Sengupta, Carsten J Schubert, Jana Milucka, Marcel M M Kuypers
Anoxygenic phototrophic sulfide oxidation by green and purple sulfur bacteria (PSB) plays a key role in sulfide removal from anoxic shallow sediments and stratified waters. Although some PSB can also oxidize sulfide with nitrate and oxygen, little is known about the prevalence of this chemolithotrophic lifestyle in the environment. In this study, we investigated the role of these phototrophs in light-independent sulfide removal in the chemocline of Lake Cadagno. Our temporally resolved, high-resolution chemical profiles indicated that dark sulfide oxidation was coupled to high oxygen consumption rates of ~9 μM O2 ·h-1 ...
January 28, 2019: Environmental Microbiology
https://read.qxmd.com/read/30682758/influence-of-algal-blooms-decay-on-arsenic-dynamics-at-the-sediment-water-interface-of-a-shallow-lake
#11
Liqing Zeng, Changzhou Yan, Jianhua Guo, Zhuo Zhen, Yuan Zhao, Dapeng Wang
Algal blooms decay affects the mobility, bioavailability, and toxicity of arsenic (As) in aquatic environments. The decaying process alters aquatic redox conditions and also introduces ample organic matter, conditions favorable for microbial reduction to simulate As release and As species transformation. This study investigated the role of algae (Microcystis aeruginosa (MA)) blooms decay on the dynamics of labile As and elements associated with its release, such as iron (Fe), manganese (Mn) and sulfide (S), at the sediment-water surface (SWI) of a shallow lake (Lake Taihu) in China, applying mesocosm incubation...
March 2019: Chemosphere
https://read.qxmd.com/read/30678021/impact-of-planktonic-low-nucleic-acid-content-bacteria-to-bacterial-community-structure-and-associated-ecological-functions-in-a-shallow-lake
#12
Yuhao Song, Yufeng Wang, Guannan Mao, Guanghai Gao, Yingying Wang
In this study, 0.45 μm filtration, flow cytometric fingerprint, 16S rRNA amplicon sequencing, and bioinformation tools were adopted to analyze the structural diversity and potential functions of planktonic low nucleic acid (LNA)- content bacteria in a shallow lake. Three bacterial groups, namely, "LNA," "high nucleic acid (HNA)-Small," and "HNA-Large," were classified through flow cytometric fingerprint, among which the "HNA-Small" group was possibly in the proliferation stage of the "LNA" group...
March 25, 2019: Science of the Total Environment
https://read.qxmd.com/read/30677872/stable-isotope-evidence-for-identifying-the-recharge-mechanisms-of-precipitation-surface-water-and-groundwater-in-the-ebinur-lake-basin
#13
Shuai Hao, Fadong Li, Yanhong Li, Congke Gu, Qiuying Zhang, Yunfeng Qiao, Li Jiao, Nong Zhu
Arid areas cover more than one third of global land, and as such, water resources are vital for this fragile ecosystem. In order to reveal the recharge mechanisms among different water bodies in arid areas, precipitation, surface water, and groundwater were sampled in the Ebinur Lake basin, Xinjiang, China, and the isotopic values for hydrogen and oxygen were measured. The stable isotope values of precipitation showed significant seasonal variation, with minimum values in the winter, medium values in the spring and autumn, and maximum values in the summer...
March 20, 2019: Science of the Total Environment
https://read.qxmd.com/read/30671653/morphometric-and-water-quality-features-of-lake-cajititl%C3%A3-n-mexico
#14
José de Anda, José de Jesús Díaz-Torres, Misael Sebastián Gradilla-Hernández, Lissie Marcela de la Torre-Castro
Lake Cajititlán is a shallow water body located in an endorheic basin in western Mexico at 1551 m a.s.l. The surface area is 1744 ha, maximum storage volume achieved is 70.89 Hm3 , and maximum depth is 5.4 m at its maximum capacity. The lake has experienced significant changes in its level because of drought conditions in recent years. Because the lake has shallow features and is settled in a closed basin with rapid population growth, the lake water has suffered severe anthropogenic contamination causing damages in its intrinsic esthetic, social, environmental, and economic values...
January 22, 2019: Environmental Monitoring and Assessment
https://read.qxmd.com/read/30669047/charophytes-collapse-beyond-a-critical-warming-and-brownification-threshold-in-shallow-lake-systems
#15
Maidul I Choudhury, Pablo Urrutia-Cordero, Huan Zhang, Mattias K Ekvall, Leonardo Rafael Medeiros, Lars-Anders Hansson
Charophytes play a critical role for the functioning of shallow lake ecosystems. Although growth of charophytes can be limited by many factors, such as temperature, nutrients and light availability, our understanding about concomitant effects of climate warming and other large-scale environmental perturbations, e.g. increases in humic matter content ('brownification') is still limited. Here we conducted an outdoor mesocosm experiment during 71 days with a common charophyte species, Chara vulgaris, along an increasing gradient of temperature and brownification...
January 15, 2019: Science of the Total Environment
https://read.qxmd.com/read/30659484/in-situ-resuspension-rate-monitoring-method-in-the-littoral-zone-with-multi-ecotypes-of-a-shallow-wind-disturbed-lake
#16
Chuang Qi, Xiao-Guang Xu, Kuan Shi, Li-Min Zhang, Yang Zhou, Hui Lin, Xin-Ting Wu, Guo-Xiang Wang, Han Meng
Sediment resuspension has been recognized as a crucial internal process in aquatic ecosystems. However, there is still a lack of reliable measuring methods due to the complex hydrodynamic conditions in large shallow eutrophic lakes. In this study, sequential sediment traps (SST) and instantaneous multiple point (IMP) methods were compared at 6 sites located in the littoral zone of Zhushan Bay in Lake Taihu. Results show that the average resuspension rates (RRs) estimated using the IMP method at sites 1 to 6 were 266...
January 18, 2019: Environmental Science and Pollution Research International
https://read.qxmd.com/read/30659224/sediment-fluxes-rather-than-oxic-methanogenesis-explain-diffusive-ch-4-emissions-from-lakes-and-reservoirs
#17
Frank Peeters, Jorge Encinas Fernandez, Hilmar Hofmann
Methane emissions from lakes and reservoirs are a major natural source in the global budget of atmospheric CH4 . A large fraction of these emissions are due to diffusive transport of CH4 from surface waters to the atmosphere. It was suggested recently that CH4 production in the oxic surface waters is required to compensate for diffusive CH4 emissions from lakes. In contrast, we demonstrate here that typical diffusive CH4 -fluxes from sediments in shallow water zones, Fsed,S , suffice to explain CH4 emissions to the atmosphere...
January 18, 2019: Scientific Reports
https://read.qxmd.com/read/30628321/-temporal-spatial-distribution-of-nitrogen-and-phosphorus-nutrients-in-lake-taihu-based-on-geostatistical-analysis
#18
Wei-Wei Lü, Xin Yao, Bao-Hua Zhang, Guang Gao, Ke-Qiang Shao
It is of great significance to investigate the spatio-temporal variation in nitrogen and phosphorus nutrients as a mechanism for controlling the sudden increase of algae in eutrophic water. Based on the geostatistical analysis, we studied the sources and occurring forms of nitrogen and phosphorus in different areas of Lake Taihu-a large shallow and eutrophic lake in China. We also examined the spatial distribution of the type of nutrient restriction and its reason by monitoring the sites seasonally from August 2014 to May 2015...
February 8, 2019: Huan Jing Ke Xue= Huanjing Kexue
https://read.qxmd.com/read/30593927/long-term-distribution-and-migration-of-137-cs-in-a-small-lake-ecosystem-with-organic-rich-catchment-a-case-study-of-lake-vorsee-southern-germany
#19
T Ries, V Putyrskaya, E Klemt
In the shallow eutrophic Lake Vorsee with an organic-rich catchment the 137 Cs activity concentration in water samples (n = 250) and different fish species (n = 631) was determined for a period of 30 years starting soon after the Chernobyl fallout. To understand the distribution and migration of 137 Cs in the ecosystem of Lake Vorsee, also the 137 Cs inventory in soils of the catchment area, in sediments, in suspended matter, in water plants, as well as its vertical distribution in soils and sediments were studied...
December 26, 2018: Journal of Environmental Radioactivity
https://read.qxmd.com/read/30564204/multiple-strategies-for-light-harvesting-photoprotection-and-carbon-flow-in-high-latitude-microbial-mats
#20
Adrien Vigneron, Perrine Cruaud, Vani Mohit, Marie-Josée Martineau, Alexander I Culley, Connie Lovejoy, Warwick F Vincent
Microbial mats are ubiquitous in polar freshwater ecosystems and sustain high concentrations of biomass despite the extreme seasonal variations in light and temperature. Here we aimed to resolve genomic adaptations for light-harvesting, bright-light protection, and carbon flow in mats that undergo seasonal freeze-up. To bracket a range of communities in shallow water habitats, we sampled cyanobacterial mats in the thawed littoral zone of two lakes situated at the northern and southern limits of the Canadian Arctic permafrost zone...
2018: Frontiers in Microbiology
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