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shallow lake

Alexander S Savvichev, Vladislav V Babenko, Olga N Lunina, Maria A Letarova, Daria I Boldyreva, Elena F Veslopolova, Nikolay A Demidenko, Natalia M Kokryatskaya, Elena D Krasnova, Vasil A Gaysin, Elena S Kostryukova, Vladimir M Gorlenko, Andrey V Letarov
Located on the shore of Kandalaksha Bay (White Sea, Russia) and previously separated from it, Trekhtzvetnoe Lake (average depth 3.5 m) is one of the shallowest meromictic lakes known. Despite its shallowness, it features completely developed water column stratification with high-density microbial chemocline community (bacterial plate) and high rates of major biogeochemical processes. A sharp halocline stabilizes the stratification. Chlorobium phaeovibrioides dominated the bacterial plate, which reached a density of 2×108 cell ml-1 and almost completely intercepts H2 S diffusion from the anoxic monimolimnion...
August 16, 2018: Environmental Microbiology
Nadia Diovisalvi, Mariana Odriozola, Javier García de Souza, Florencia Rojas Molina, María Soledad Fontanarrosa, Roberto Escaray, José Bustingorry, Pablo Sanzano, Fabian Grosman, Horacio Zagarese
The relationship between the timing of recurrent biological events and seasonal climatic patterns (i.e., phenology) is a crucial ecological process. Changes in phenology are increasingly linked to global climate change. However, current evidence of phenological responses to recent climate change is subjected to substantial regional and seasonal biases. Most available evidence on climate driven phenological changes comes from Northern Hemisphere (NH) ecosystems, and typically involve increases in spring and summer temperatures, which translate into earlier onsets of spring population developments...
August 15, 2018: Global Change Biology
Sari Peura, Moritz Buck, Sanni L Aalto, Sergio E Morales, Hannu Nykänen, Alexander Eiler
Oxygen-stratified lakes are typical for the boreal zone and also a major source of greenhouse gas emissions in the region. Due to shallow light penetration, restricting the growth of phototrophic organisms, and large allochthonous organic carbon inputs from the catchment area, the lake metabolism is expected to be dominated by heterotrophic organisms. In this study, we test this assumption and show that the potential for autotrophic carbon fixation and internal carbon cycling is high throughout the water column...
August 14, 2018: MBio
István G Hatvani, Alexander K T Kirschner, Andreas H Farnleitner, Péter Tanos, Alois Herzig
To minimize the risk of negative consequences for public health from fecal pollution in lakes, the continuous surveillance of microbiological water quality parameters, alongside other environmental variables, is necessary at defined bathing sites. Such routine surveillance may prove insufficient to elucidate the main drivers of fecal pollution in a complex lake/watershed ecosystem, and it may be that more comprehensive monitoring activities are required. In this study, the aims were to identify the hotspots and main driving factors of fecal pollution in a large shallow Central European lake, the Neusiedler See, and to determine to what degree its current monitoring network can be considered representative spatially...
August 13, 2018: Environmental Science and Pollution Research International
Renalda N Munubi, Peter B McIntyre, Yvonne Vadeboncoeur
Food quality determines the growth rate of primary consumers and ecosystem trophic efficiencies, but it is not clear whether variation in primary consumer densities control, or is controlled by, variation in food quality. We quantified variation in the density and condition of an abundant algae-eating cichlid, Tropheus brichardi, with respect to the quality and productivity of algal biofilms within and across rocky coastal sites in Lake Tanganyika, East Africa. Adjacent land use and sediment deposition in the littoral zone varied widely among sites...
August 12, 2018: Oecologia
Wei Li, Brendan J Hicks, Mingli Lin, Chuanbo Guo, Tanglin Zhang, Jiashou Liu, Zhongjie Li, David A Beauchamp
Mandarin fish Siniperca chuatsi, a valuable piscivorous fish, have been stocked into many lakes in China since the 1990s. This study did the first attempt to evaluate the ecological effects of hatchery-reared mandarin fish stocking in the Yangtze River basin lakes. Our study demonstrated a significant change in fish community composition after mandarin fish stocking, but no fish extinction was observed. No significant difference was observed in the total density of 13 forage fish before and after mandarin fish stocking, but the total biomass showed a significant decline after mandarin fish stocking...
July 31, 2018: Scientific Reports
A Mentzafou, E Dimitriou
The water quality of Koumoundourou Lake, a heavily modified, peri-urban, brackish and shallow lake near Athens, Greece, is under multiple stressors due to the industrial activities in the catchment area and natural pollution pressures. Although the broader area has undergone significant land use changes since the beginning of the 20th century converting it from rural to heavily industrialized, Koumoundourou Lake remained as one of the few habitats in Attica Region, for large numbers of aquatic birds. The water quality of the lake has been recently improved, which contributed to the increase of aquatic birds' population in the area and to the higher, in relation to the past, nitrogen inputs from natural sources...
July 20, 2018: Science of the Total Environment
Masato Yamamichi, Takehiro Kazama, Kotaro Tokita, Izumi Katano, Hideyuki Doi, Takehito Yoshida, Nelson G Hairston, Jotaro Urabe
Light is a fundamental driver of ecosystem dynamics, affecting the rate of photosynthesis and primary production. In spite of its importance, less is known about its community-scale effects on aquatic ecosystems compared with those of nutrient loading. Understanding light limitation is also important for ecosystem management, as human activities have been rapidly altering light availability to aquatic ecosystems. Here we show that decreasing light can paradoxically increase phytoplankton abundance in shallow lakes...
July 4, 2018: Proceedings. Biological Sciences
Rongqin Liu, Kunshan Bao, Shuchun Yao, Fuyi Yang, Xiaolong Wang
In order to understand the distribution and the ecological risk of the potentially harmful trace elements (PHTEs) in lake sediments of Songnen Plain, northeast (NE) China, an integrated survey of PHTEs (As, Cd, Cr, Cu, Ni, Pb, Zn and Ti) was conducted in July 2015 in 11 shallow lakes adjacent to Qiqihar and Daqing. The enrichment factor (EF) and Index of geoaccumulation (Igeo ) results showed that Cd was obviously enriched in all lakes and reached the moderate pollution level. A comparison of PHTE concentrations in the lake sediments from 2005 to 2015 found the PHTEs pollution status doubled...
July 23, 2018: Ecotoxicology and Environmental Safety
Zhichun Li, Xiaoguang Xu, Ming Ji, Guoxiang Wang, Ruiming Han, Jie Ma, Xingcheng Yan, Jine Liu
The multiple proxies involving elemental and stable isotope ratios (C/N, δ15 N and δ13 C) and biomarkers are powerful tools for estimating sedimentary organic matter (SOM) sources. However, the systematic and reasonable evaluation of organic matter sources existing with serious spatial heterogeneity in large, shallow and eutrophic lakes is still far from clear. Samples of sediments, aquatic plants and particulate organic matter (POM) collected from different ecotype regions of Taihu Lake, China, including algae-type lakeshore, grass-type lakeshore, algae-grass-type lakeshore, inflow rivers and estuary, groove reed zone, offshore and central regions, were analyzed for their SOM sources via elemental and stable isotope ratios (C/N, δ15 N and δ13 C), n-alkanes and fatty acids (FA)...
October 15, 2018: Journal of Environmental Management
Xin Tang, Xiaolin Zhang, Te Cao, Leyi Ni, Ping Xie
The geo-engineering approach of modified soil flocculation has been widely applied to mitigate algal blooms and eutrophication in relatively small lakes. Nevertheless, its potential ecological risks and feasibility should be examined and identified prior to its application in large natural lakes given the multiple functions of these water bodies in human health and welfare. In situ mesocosm experiments on modified soil flocculation were performed in Lake Taihu during summer 2010 and 2011. Chitosan-modified kaolinite (CMK) soil was used to flocculate algal blooms and improve water transparency to facilitate the re-establishment of the submersed macrophyte Vallisneria natans in this shallow eutrophic lake...
June 1, 2018: Science of the Total Environment
Jelmer W Poelstra, Emilie J Richards, Christopher H Martin
The process of sympatric speciation in nature remains a fundamental unsolved problem. Cameroon crater lake cichlid radiations were long regarded as one of the most compelling examples; however, recent work showed that their origins were more complex than a single colonization event followed by isolation. Here, we performed a detailed investigation of the speciation history of a radiation of Coptodon cichlids from Lake Ejagham, Cameroon, using whole-genome sequencing data. The existence of the Lake Ejagham Coptodon radiation is remarkable as this 0...
July 4, 2018: Molecular Ecology
Yi-Yuan Xu, Ling-Xia Zeng, Tian-Rong He, Meng-Yu Chen, Xiao-Li Qian, Zhen-Ji Li
Caohai wetland is a National Nature Reserve. Benthic animals were collected from the deep-water area in the middle of Caohai Lake and the shallow-water area in the surrounding marshes, and mercury and methyl mercury distributions in the benthic animals were analyzed and discussed. The risk of mercury pollution was evaluated. The concentrations of total mercury and methyl mercury in the benthonic animals were in the range of 0.51-46.55 ng·g-1 with an average of 7.82 ng·g-1 and 0.04-27.71 ng·g-1 with an average of 4...
June 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
Xiao-le Kong, Shi-Qin Wang, Fei Ding, Hui-Ya Liang
In order to study the source of nitrate in surface water and groundwater near a domestic sewage discharge river in the Baiyangdian watershed, including the Fuhe River and Baiyangdian Lake, shallow groundwater and deep groundwater samples were collected in July 2014.Water chemistry and stable isotopes (δ2 H and δ18 O) were used to study the relationship between the surface water and groundwater. δ15 N was used to explore the source of nitrate. The results show that urban and rural domestic sewage discharge to Fuhe River and then experience evaporation...
June 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
Hui-Ming Zha, Meng-Yuan Zhu, Guang-Wei Zhu, Zhou-Sheng Yang, Hai Xu, Rui-Jie Shen, Chun-Ni Zhong
The seasonal and spatial variation of external nutrient loading from rivers and their impact on lake water quality were analyzed in Lake Taihu, China, using the monthly monitoring data from 16 major inflow/outflow rivers and 32 observation sites in the lake. The results showed:① The average monthly values of total nitrogen (TN), dissolved total nitrogen (DTN), total phosphorus (TP), and dissolved total phosphorus (DTP) in rivers were all higher than the corresponding areas in the lake. Significant positive correlations were found between nutrient concentrations in the inflow rivers and the corresponding areas in the lake, indicating the pronounced impact of external loading on lake water...
March 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
Tian-Peng Hu, Xin-Li Xing, Yan-Ping Ke, Yao Mao, Ying Li, Huang Zheng, Yue Yu, Jia-Quan Zhang, Shi-Hua Qi
Ten sampling points were distributed approximately equidistantly in the Dajiuhu lake wetland, and soils from the depths 0-10 cm, 10-20 cm, and 20-30 cm were collected in April 2012. Gas chromatography-mass spectrometry (GC-MS) was used to analyze the remote mountain wetland shallow soils, and 16 kinds of USEPA priority controlled polycyclic aromatic hydrocarbon (PAH) pollutants were identified. The ∑16 PAHs content ranges of the shallow soils of this region were 48.55-984.73 ng·g-1 , 14.36-806.47 ng·g-1 , and 12...
April 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
Li Yang, Wei Zhang, Guang-Xia Shang, Jun-Yi Zhang, Li-Qing Wang, Hua Wei
Dianshan Lake, a subtropical shallow lake, is one of the main drinking water sources of Shanghai City. In order to explore the characteristics of phytoplankton functional groups (PFGs) and their relationships with environmental factors in Dianshan Lake, phytoplankton and water samples collected from January 2015 to December 2016 were characterized. Results suggested that there were 26 PFGs during our study period. The biomasses of 15 PFGs (B, C, D, F, G, H1, J, Lo, M, MP, P, W1, W2, X1, and X2) were dominant and had marked annual succession patterns: D/C Lo/C/MP MP/J/P/W1 P in 2015 and P W2/Lo W2/G/M/H1 P in 2016...
July 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
Federico Spagnoli, Annamaria Andresini
The Lago di Lesina (Lesina Lake, southeastern Italy) is a coastal pond located on an alluvial plain to the north of Gargano Promontory. The aim of this work was to study the depositional and hydrological processes, the benthic environment and the heavy metal sediments pollution of Lesina Lake. The study was carried out by Redox potential, water content, grain-size, mineralogical and biogeochemical analyses in surface sediments collected from 100 sampling stations in the coastal pond bottom. The results showed a predominance of three types of bottom pelitic sediments of different origins and compositions: siliciclastic, carbonatic, and organic...
June 27, 2018: Science of the Total Environment
Haiyan Zhang, Yuesuo Yang, Junyu Zou, Yujuan Wen, Cuiping Gao
The Wudalianchi scenic area in NE China has been named an UNESCO "Global Geopark" and "Biosphere Reserve." During this investigation, the sources of nitrate and the hydrologic system through which it is dispersed were assessed using geochemical data and a multiple isotopic approach. The cold waters from the south and north springs originated from the deep subsurface. Isotopically, these waters exhibited relatively negative δD and δ18 O values and nitrate in the water was substantially depleted 15 N, suggesting that the mineral water was primarily derived from depth...
June 14, 2018: Environmental Science and Pollution Research International
Carlos E Fabin, Osvaldo J Correia Filho, Márcio L Alencar, José A Barbosa, Tiago S DE Miranda, Virgínio H Neumann, Igor F Gomes, Felipe R DE Santana
The Ipubi Formation represents the Aptian-Albian siliciclastic-evaporitic succession of Araripe Basin, NE Brazil. This succession comprises siliciclastic rocks (bituminous shales and claystones) and evaporites (gypsum and secondary anhydrite) and represents part of the lacustrine-shallow marine post-rift phase I. This study used sequence stratigraphy concepts to define the relations between changes in the relative lake level and the formation of Ipubi deposits. Results show that the organic-rich shales of the Ipubi Formation formed during a transgressive pulse that covered large areas of the proximal domains...
June 25, 2018: Anais da Academia Brasileira de Ciências
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