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https://www.readbyqxmd.com/read/30315584/non-native-species-and-lake-warming-negatively-affect-arctic-char-salvelinus-alpinus-abundance-deep-thermal-refugia-facilitate-co-existence
#1
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
https://www.readbyqxmd.com/read/30308841/spatial-distribution-of-sediment-nitrogen-and-phosphorus-in-lake-taihu-from-a-hydrodynamics-induced-transport-perspective
#2
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
https://www.readbyqxmd.com/read/30308820/environmental-factors-driving-the-occurrence-of-the-invasive-cyanobacterium-sphaerospermopsis-aphanizomenoides-nostocales-in-temperate-lakes
#3
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
https://www.readbyqxmd.com/read/30301066/sources-and-fate-of-organic-matter-in-constructed-versus-natural-coastal-waterways
#4
Kylie A Pitt, Shin Yip Lee, Rod M Connolly, Thi Hong Hanh Bui, Nic Doriean
Coastal wetlands are increasingly being converted into canal estates with potential consequences for ecosystem functioning. We compared the sources and fate of organic matter and water quality at four types of canal habitats (entrances and ends of canals, canal lakes and lake edges) and shallow and deep natural habitats (four replicates of each habitat). The fate of labile organic matter was assessed by measuring rates of scavenging of carrion. Surface sediments were analysed for organic carbon content and stable carbon isotopes, fatty acid biomarkers and compound specific stable isotope analysis of selected fatty acids were used to elucidate sources of sedimentary organic matter...
October 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/30294311/characterization-and-salt-response-in-recurrent-halotolerant-exiguobacterium-sp-sh31-isolated-from-sediments-of-salar-de-huasco-chilean-altiplano
#5
Francisco Remonsellez, Juan Castro-Severyn, Coral Pardo-Esté, Pablo Aguilar, Jonathan Fortt, Cesar Salinas, Sergio Barahona, Joice León, Bárbara Fuentes, Carlos Areche, Klaudia L Hernández, Daniel Aguayo, Claudia P Saavedra
Poly-extremophiles microorganisms have the capacity to inhabit hostile environments and can survive several adverse conditions that include as variations in temperature, pH, and salinity, high levels UV light and atmospheric pressure, and even the presence of toxic compounds and the formation of reactive oxygen species (ROS). A halotolerant Exiguobacterium strain was isolated from Salar de Huasco (Chilean Altiplano), a well-known shallow lake area with variable salinity levels, little human intervention, and extreme environmental conditions, which makes it ideal for the study of resistant mechanisms and the evolution of adaptations...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/30290349/deriving-nutrient-criteria-to-support-good-ecological-status-in-european-lakes-an-empirically-based-approach-to-linking-ecology-and-management
#6
Sandra Poikane, Geoff Phillips, Sebastian Birk, Gary Free, Martyn G Kelly, Nigel J Willby
European water policy has identified eutrophication as a priority issue for water management. Substantial progress has been made in combating eutrophication but open issues remain, including setting reliable and meaningful nutrient criteria supporting 'good' ecological status of the Water Framework Directive. The paper introduces a novel methodological approach - a set of four different methods - that can be applied to different ecosystems and stressors to derive empirically-based management targets. The methods include Ranged Major Axis (RMA) regression, multivariate Ordinary Least Squares (OLS) regression, logistic regression, and minimising the mismatch of classifications...
September 28, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30289946/effects-of-climatically-modulated-changes-in-solar-radiation-and-wind-speed-on-spring-phytoplankton-community-dynamics-in-lake-taihu-china
#7
Jianming Deng, Wei Zhang, Boqiang Qin, Yunlin Zhang, Hans W Paerl, Nico Salmaso
Many studies have focused on the interactive effects of temperature increases due to global warming and nutrient enrichment on phytoplankton communities. Recently, non-temperature effects of climate change (e.g., decreases in wind speed and increases in solar radiation) on large lakes have received increasing attention. To evaluate the relative contributions of both temperature and non-temperature effects on phytoplankton communities in a large eutrophic subtropical shallow lake, we analyzed long-term monitoring data from Lake Taihu, China from 1997 to 2016...
2018: PloS One
https://www.readbyqxmd.com/read/30286539/sr-isotope-fingerprinting-of-multiple-water-source-characterizations-and-its-environmental-implications-in-a-complex-lake-groundwater-system-wudalianchi-northeast-china
#8
Junyu Zou, Yuesuo Yang, Haiyan Zhang
The Wudalianchi UNESCO Global Geopark (Northeast China) is famous for its rare cold mineral springs and its associated five hydrologically connected barrier lakes. During this study, strontium (Sr) isotopes (87 Sr/86 Sr) were studied along with other geochemical data to determine the source of water within the region's deep and shallow mineral springs, shallow wells, and lakes. These waters were characterized by a relatively narrow range of 87 Sr/86 Sr ratios (0.70648-0.70816). Those ratios were not different in shallow and deep mineral spring waters, and probably reflect ratios associated with potassium volcanic rocks in the area as expected...
December 2018: Chemosphere
https://www.readbyqxmd.com/read/30251874/mars-relevant-field-experiences-in-morocco-the-importance-of-spatial-scales-and-subsurface-exploration
#9
Akos Kereszturi, Zsuzsanna Kapui, Gian Gabrielle Ori, Kamal Taj-Eddine, Gabor Ujvari
During field work at the Ibn Battuta Mars analogue sites, two research questions were analyzed: (1) How do we identify sampling sites using remote and local imaging and (2) what kind of information can be gained from shallow subsurface exploration? While remote images help in targeting field activities in general, the connection between observations at different spatial scales for different rocky desert terrain types is not well established; in this, focused comparison of remote in situ images of well-selected analogues would help a great deal...
September 22, 2018: Astrobiology
https://www.readbyqxmd.com/read/30248859/climatically-modulated-decline-in-wind-speed-may-strongly-affect-eutrophication-in-shallow-lakes
#10
Jianming Deng, Hans W Paerl, Boqiang Qin, Yunlin Zhang, Guangwei Zhu, Erik Jeppesen, Yongjiu Cai, Hai Xu
Surface wind speed has declined significantly globally. However, the response of aquatic systems to decreasing wind speeds has received little attention. We examined the effects of a long-term decrease in wind speed on shallow, eutrophic Lake Taihu, China's third largest lake, by combining high-frequency monitoring, long-term meteorological and water quality data with short-term laboratory sediment nutrient release experiments. The annual mean wind speed showed a significant decreasing trend and the maximum continuous days with wind speed <3 m/s increased significantly from 1996 to 2017...
December 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30245423/hydrodynamics-of-salt-flat-basins-the-salar-de-atacama-example
#11
M A Marazuela, E Vázquez-Suñé, C Ayora, A García-Gil, T Palma
The Salar de Atacama is one of the most well-known saline endorheic basins in the world. It accumulates the world main lithium reserves and contains very sensitive ecosystems. The objective of this work is to characterize the hydrodynamics of the Salar de Atacama, and to quantify its complex water balance prior to the intense brine extraction. The methodology and results can be extrapolated to the groundwater flow and recharge of other salt flats. A three-dimensional groundwater flow model using low computational effort was calibrated against hundreds of hydraulic head measurements...
September 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30238229/using-generalized-additive-models-to-investigate-factors-influencing-cyanobacterial-abundance-through-phycocyanin-fluorescence-in-east-lake-china
#12
Yi-Ming Kuo, Jun Yang, Wen-Wen Liu, Enmin Zhao, Ran Li, Liquan Yao
East Lake is a shallow lake (in Wuhan, China) where cyanobacteria blooms occurred frequently from 1970 to 1985. During the study period, all Carlson trophic state index values were > 50, indicating that East Lake is in a eutrophic state. In this study, phycocyanin concentrations were measured through phycocyanin fluorometry for rapid assessment of cyanobacterial abundance. The smoothing splines of the optimal generalized additive model (GAM) indicated that Secchi depth (SD), total phosphorus (TP) and dissolved oxygen (DO) concentrations, electrical conductivity (EC), chemical oxygen demand (COD), and ratios of total nitrogen (TN) to TP (TN:TP) were the main environmental factors in a moderate nonlinear relationship with cyanobacterial phycocyanin concentrations in East Lake...
September 20, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/30236468/successful-restoration-of-a-tropical-shallow-eutrophic-lake-strong-bottom-up-but-weak-top-down-effects-recorded
#13
Zhengwen Liu, Jinrun Hu, Ping Zhong, Xiufeng Zhang, Jiajia Ning, Søren E Larsen, Deyuan Chen, Yiming Gao, Hu He, Erik Jeppesen
Fish manipulation has been used to restore lakes in the temperate zone. Often strong short-term cascading effects have been obtained, but the long term-perspectives are less clear. Fish manipulation methods are far less advanced for warm lakes, and it is debatable whether it is, in fact, possible to create a trophic cascade in warm lakes due to the dominance and high densities of fast-reproducing omnivorous fish. However, removal of benthic feeding fish also reduce disturbance of the sediment, which not only affects the nutrient level but also the concentration of suspended organic and inorganic matter with enhanced water clarity and potentially better growth conditions for submerged macrophytes...
September 11, 2018: Water Research
https://www.readbyqxmd.com/read/30229368/distribution-and-bioavailability-of-trace-metals-in-shallow-sediments-from-grand-lake-oklahoma
#14
Shane Morrison, Steve Nikolai, Darrell Townsend, Jason Belden
The Tri-State Mining District (TSMD) is a historic mining area containing the Tar Creek superfund site and is the source for sediment-bound metals in Grand Lake. Despite elevated concentrations of cadmium, lead, and zinc, no evidence of sediment toxicity has been observed during previous investigations; however, these studies were limited to lake transects with mostly deep-water sediments. The purpose of this study was to assess whether TSMD-specific sediment toxicity thresholds (STTs), developed for small streams and tributaries draining the TSMD, are predictive of biological effects within the greater lake body...
September 18, 2018: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/30221104/a-qpcr-method-to-quantify-bioavailable-phosphorus-using-indigenous-aquatic-species
#15
Yanan Yang, Jianghua Yang, Xiaowei Zhang
Background: Bioavailable phosphorus (BAP) represents the sum of phosphorus that is readily available for algae growth and is useful to indicate the severity of eutrophication in aquatic environments. Results: Here, a quantitative real-time PCR (qPCR)-based bioassay was developed to quantify BAP using the indigenous cyanobacterium species Anabaena sp. of Lake Tai, a large and shallow eutrophic lake in the Yangtze Valley, China. Primers were designed to quantify the gene expression of alkaline phosphatase ( phoA / phoA - like) and phosphate transporter ( pst1 ) genes of Anabaena ...
2018: Environmental Sciences Europe
https://www.readbyqxmd.com/read/30213456/hydrological-buffering-during-groundwater-acidification-in-rapidly-industrializing-alluvial-plains
#16
Beiyi Xu, Guangcai Wang, Qiang Yang, Yan Zheng
Shallow groundwater in alluvial plains is vulnerable to contamination due to infiltration of pollutants from anthropogenic activities. In the alluvial plain of the Yangtze River near Poyang Lake, a silicone monomer industrial park was found to discharge undisclosed amount of effluents containing high levels of hydrochloric acid and total dissolved solids into ponds and ditches that in turn, displayed characteristics of acidic water with high total dissolved solids. However, most shallow groundwater (n = 35, depth 5...
August 27, 2018: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/30212702/assessing-the-impact-of-long-term-changes-in-climate-and-atmospheric-deposition-on-a-shallow-alpine-lake-from-southeast-tibet
#17
Wengang Kang, Guangjie Chen, Jiaoyuan Wang, Linpei Huang, Lei Wang, Rui Li, Kui Hu, Yuanyuan Liu, Jianshuang Tao, Jules M Blais, John P Smol
Regional warming and atmospheric nitrogen deposition have been widely recorded to impact remote catchments and alpine lakes; however, their independent roles and interactions have rarely been identified. Here, we combined down-core analyses of sedimentary mercury (Hg) and aluminum (Al) with multiple proxies (i.e. nitrogen stable isotope, chlorophyll a pigments, diatoms) for a radiometrically-dated sediment core of an alpine lake in southeast Tibet to track the atmospheric deposition of pollutants, and to examine possible effects of climate and catchment forcing over the past three centuries...
February 10, 2019: Science of the Total Environment
https://www.readbyqxmd.com/read/30192854/correction-sediment-biomarkers-elucidate-the-holocene-ontogeny-of-a-shallow-lake
#18
T E Arnold, W F Kenney, J H Curtis, T S Bianchi, M Brenner
[This corrects the article DOI: 10.1371/journal.pone.0191073.].
2018: PloS One
https://www.readbyqxmd.com/read/30180346/phytoplankton-response-to-climate-changes-and-anthropogenic-activities-recorded-by-sedimentary-pigments-in-a-shallow-eutrophied-lake
#19
Hanxiao Zhang, Shouliang Huo, Kevin M Yeager, Zhuoshi He, Beidou Xi, Xiaochuang Li, Chunzi Ma, Fengchang Wu
Studies that address the potential effects of climate and anthropogenic activities on lacustrine phytoplankton succession are scarce in the shallow lakes. In the present work, the succession of phytoplankton community inferred from sedimentary pigments has been investigated; the impacts of climate and anthropogenic activities on the succession have been evaluated by the generalized additive models (GAMs) in a shallow eutrophied lake, Lake Chaohu, located eastern China. The results show that phytoplankton succession can be divided into two periods: pre-1960s and post 1960s...
January 10, 2019: Science of the Total Environment
https://www.readbyqxmd.com/read/30176793/cytonuclear-diversity-and-shared-mitochondrial-haplotypes-among-daphnia-galeata-populations-separated-by-seven-thousand-kilometres
#20
Mingbo Yin, Xiaoyu Wang, Xiaolin Ma, Sabine Gießler, Adam Petrusek, Johanna Griebel, Wei Hu, Justyna Wolinska
BACKGROUND: The zooplanktonic cladocerans Daphnia, present in a wide range of water bodies, are an important component of freshwater ecosystems. In contrast to their high dispersal capacity through diapausing eggs carried by waterfowl, Daphnia often exhibit strong population genetic differentiation. Here, to test for common patterns in the population genetic structure of a widespread Holarctic species, D. galeata, we genotyped two sets of populations collected from geographically distant areas: across 13 lakes in Eastern China and 14 lakes in Central Europe...
September 3, 2018: BMC Evolutionary Biology
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