scholarly journals Freshwater microbial taxa as indicators of anthropogenic impact on the freshwater lakes of Buryatia

2021 ◽  
Vol 908 (1) ◽  
pp. 012003
Author(s):  
S V Zaitseva ◽  
O P Dagurova
Keyword(s):  
Water Quality ◽  
Anthropogenic Impact ◽  
Baikal Region ◽  
Environmental Gradients ◽  
Structural Features ◽  
Anthropogenic Pressure ◽  
Nutrient Loads ◽  
Freshwater Lakes ◽  
High Productivity ◽  
Water Quality Deterioration

Abstract Three large freshwater lakes located in the Baikal region (Gusinoye, Shchuchye, and Kotokel) with high touristic significance were studied. Increased anthropogenic pressure is one of the most important causes of water quality deterioration (in particular, high solute and nutrient loads, high productivity). The structural features of microbial communities associated with an increased anthropogenic load have been revealed in different environmental gradients. It was shown that the genera Rhodobacter, Polynucleobacter, and Luteolibacter preferred environments with a higher trophic level and are indicators of possible anthropogenic impact.

scholarly journals Water Use Special Features under the Water Resources Scarcity Conditions (the Ishim River as a Study Case)

2015 ◽  
pp. 4-19
Author(s):  
Keyword(s):  
Water Quality ◽  
Water Resources ◽  
Water Use ◽  
Water Consumption ◽  
Anthropogenic Impact ◽  
General Trend ◽  
Volume Reduction ◽  
Transboundary Basin ◽  
Study Case ◽  
Water Quality Deterioration

Special features of water use within the boundaries of the Ishim River transboundary basin (an area with very scanty water resources) have been analyzed. In spite of the general trend of water consumption volume reduction the water quality deterioration has been found in the basin. The degree of anthropogenic impact upon water resources have been assessed on the basis of direct and indirect indicators.

scholarly journals Linkages between Macrophyte Functional Traits and Water Quality: Insights from a Study in Freshwater Lakes of Greece

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 1047 ◽  
Author(s):  
Konstantinos Stefanidis ◽  
Eva Papastergiadou
Keyword(s):  
Water Quality ◽  
Cluster Analysis ◽  
Functional Traits ◽  
Environmental Gradients ◽  
Hierarchical Cluster ◽  
Environmental Drivers ◽  
Secchi Disk ◽  
Secchi Disk Depth ◽  
Freshwater Lakes ◽  
Functional Characteristics

Freshwater ecologists have shown increased interest in assessing biotic responses to environmental change using functional community characteristics. With this article, we investigate the potential of using functional traits of the aquatic plants to assess eutrophication in freshwater lakes. To this end we collected macrophyte and physicochemical data from thirteen lakes in Greece and we applied a trait-based analysis to first identify discrete groups of macrophytes that share common functional traits and then to assess preliminary responses of these groups to water quality gradients. We allocated 11 traits that cover mostly growth form and morphological characteristics to a total of 33 macrophyte species. RLQ and fourth corner analysis were employed to explore potential relationships between species, trait composition and environmental gradients. In addition, a hierarchical cluster analysis was conducted to discriminate groups of plants that share common trait characteristics and then the position of the groups along the environmental gradients was assessed. The results showed total phosphorus, chlorophyll-a, conductivity, pH and Secchi disk depth as main drivers of the environmental gradients. Hierarchical cluster analysis showed a clear separation of macrophyte assemblages with discrete functional characteristics that appeared to associate with different environmental drivers. Thus, rooted submerged plants were related with higher Secchi disk depth, conductivity and alkalinity whereas rooted floating-leaved plants showed a preference for enriched waters with phosphorus and nitrogen. In addition, free-floating plants were related positively with nitrogen and increased pH. Although we did not identify specific trait patterns with environmental drivers, our findings indicate a differentiation of macrophytes based on their functional characteristics along water quality gradients. Overall, the presented results are encouraging for conducting future monitoring studies in lakes focused on the functional plant trait composition, as expanding the current approach to additional lakes and using quantifiable functional characteristics will provide more insight about the potential of trait-based approaches as ecological assessment systems.

scholarly journals Microbiological indicators for assessing the ecological status of freshwater lakes in Buryatia

2021 ◽  
Vol 885 (1) ◽  
pp. 012067
Author(s):  
S V Zaitseva ◽  
O P Dagurova ◽  
L P Kozyreva
Keyword(s):  
Microbial Communities ◽  
Anthropogenic Impact ◽  
High Throughput Sequencing ◽  
Ecological Status ◽  
Structural Features ◽  
Freshwater Lakes ◽  
Environmental Status ◽  
Freshwater Bodies ◽  
Using Data ◽  
Microbiological Indicators

Abstract Possible complex approaches for assessing the condition of freshwater lakes using data on microbial diversity, obtained by high-throughput sequencing, were considered. The structural features of microbial communities, associated with increased anthropogenic impact, have been revealed. We identified some microbial taxa, which can be considered as indicators of the environmental status of freshwater bodies.

scholarly journals Taxonomic composition of bacterioplankton of large freshwater lakes of the Yeravninskaya depression

2021 ◽  
Vol 908 (1) ◽  
pp. 012002
Author(s):  
O P Dagurova ◽  
L P Kozyreva ◽  
S V Zaitseva ◽  
B V Tsydenova ◽  
S P Buryukhaev ◽  
...  
Keyword(s):  
Water Quality ◽  
Microbial Community ◽  
Anthropogenic Impact ◽  
Total Dissolved Solids ◽  
Taxonomic Composition ◽  
Anthropogenic Factors ◽  
Freshwater Lakes ◽  
Bacterial Phyla ◽  
Natural And Anthropogenic Factors ◽  
Number Of Bacteria

Abstract Bacterioplankton community taxonomic composition of four large freshwater lakes of the Yeravninskaya depression (Bolshoye Yeravnoye, Gunda, Isinga, and Sosnovoye) which have great fishery significance for the region has been studied. The microbial community consists in the main of bacterial phyla Gammaproteobacteria (22-74%), Actinobacteria (4-35%), Firmicutes (1.17-34.6%), Bacteroidetes (0.3-7%), Cyanobacteria (0.9-6.5%) and Planctomycetes (1.5-10.5%). Total dissolved solids and sulphates accounted for 57% of the variation in the microbial community distribution. At the genus level, Acinetobacter dominated (average 21.4-25.2%). Pseudomonas, Exiguobacterium, and Massilia were also widespread. Their predominance may indicate a possible change in the structure of the community caused by natural and anthropogenic factors. In lakes Isinga and Gunda, a large number of bacteria of the genus Klebsiella was observed, Staphylococcus and Streptococcus were detected. These features indicate insufficient water quality as a result of anthropogenic impact.

Potential impacts of slum urbanisation on channel bank storage in the Bang Pakong River, Thailand

2012 ◽  
Vol 7 (4) ◽  
Author(s):  
K. Harriden
Keyword(s):  
Water Quality ◽  
Balance Equations ◽  
Physical Processes ◽  
Social Phenomena ◽  
Urban Settlements ◽  
Recharge Rates ◽  
Water Quality Deterioration ◽  
Informal Urban Settlements ◽  
Storage Processes

Generally regarded as social phenomena, this paper regards slum urbanisation as an environmental actor. Specifically, how slum developments modify hydrogeomorphological processes motivates this research. Using the Bang Pakong River, eastern Thailand, as a case study, a literature review was conducted. The literature reviewed indicated changes in physical processes such as channel bank stability, water quality, flow regimes and the hydrological balance equations can occur with slum development. Given the importance of channel banks as the physical basis of many slum sites, this paper focuses on the possible changes to channel bank storage in the Bang Pakong River following slum urbanisation. The research highlights possible changes to channel bank storage processes, notably decreased storage recharge rates; increased anthropogenic extraction; and probable water quality deterioration. Deeper scientific understanding of how river processes are affected by specific forms of urban development can contribute to better management of both informal urban settlements and rivers.

Living with water: at the cross-roads of change

1995 ◽  
Vol 31 (8) ◽  
pp. 393-400 ◽  
Author(s):  
Joost de Jong ◽  
Peter T. J. C. van Rooy ◽  
S. Harry Hosper
Keyword(s):  
Water Management ◽  
Water Quality ◽  
Water Environment ◽  
Integrated Water Management ◽  
Practical Action ◽  
The People ◽  
Global Perception ◽  
Local Water ◽  
Water Quality Deterioration ◽  
The Way

Until the last two decades, the global perception of how to control our various water bodies was remarkably similar – water management was organised on a sectoral basis, as it always had been. It was only in the 1970s that the people actually responsible for implementing water management began to become aware of the serious implications of such an approach: water quality deterioration, desiccation and an alarming loss of the flora and fauna that characterised their local water environment. It was a growing awareness that led to the formation of the concept of integrated water management, a concept almost universally accepted today as the way forward. However, despite the fact that few dispute the validity of the concept, a number of obstacles remain before this theoretical agreement can be transformed into practical action. Three main bottlenecks stand in the way of implementation: institutional, communicational and socio-political. Whilst solutions to these are available, the key question still to be answered is whether society is really prepared to accept the consequent changes in the way we live that will result from putting the theory of integrated water management into practice. It was this issue that dominated the “Living with water” conference held in Amsterdam in September 1994. The following is a summary of the discussions held there and the various papers that were submitted.

scholarly journals Assessing the Market for Poultry Litter in Georgia: Are Subsidies Needed to Protect Water Quality?

2011 ◽  
Vol 43 (4) ◽  
pp. 553-568 ◽  
Author(s):  
Jeffrey Mullen ◽  
Ulugbek Bekchanov ◽  
Berna Karali ◽  
David Kissel ◽  
Mark Risse ◽  
...  
Keyword(s):  
Water Quality ◽  
Poultry Litter ◽  
Focused Attention ◽  
Water Protection ◽  
Nutrient Loads ◽  
Transportation Model ◽  
Synthetic Fertilizer ◽  
Protection Goals ◽  
Subsidy Program ◽  
The Relationship

Concerns about nutrient loads into our waters have focused attention on poultry litter applications. Like many states with a large poultry industry, Georgia recently designed a subsidy program to facilitate the transportation of poultry litter out of vulnerable watersheds. This paper uses a transportation model to examine the necessity of a poultry litter subsidy to achieve water protection goals in Georgia. We also demonstrate the relationship between diesel and synthetic fertilizer prices and the value of poultry litter. Results suggest that a well-functioning market would be able to remove excess litter from vulnerable watersheds in the absence of a subsidy.

scholarly journals Seasonal Succession of Bacterial Communities in Three Eutrophic Freshwater Lakes

2021 ◽  
Vol 18 (13) ◽  
pp. 6950
Author(s):  
Bin Ji ◽  
Cheng Liu ◽  
Jiechao Liang ◽  
Jian Wang
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Water Temperature ◽  
Bacterial Communities ◽  
Seasonal Succession ◽  
Lake Eutrophication ◽  
Urban Lake ◽  
Freshwater Lakes ◽  
Functional Prediction ◽  
Bacterial Indicator

Urban freshwater lakes play an indispensable role in maintaining the urban environment and are suffering great threats of eutrophication. Until now, little has been known about the seasonal bacterial communities of the surface water of adjacent freshwater urban lakes. This study reported the bacterial communities of three adjacent freshwater lakes (i.e., Tangxun Lake, Yezhi Lake and Nan Lake) during the alternation of seasons. Nan Lake had the best water quality among the three lakes as reflected by the bacterial eutrophic index (BEI), bacterial indicator (Luteolibacter) and functional prediction analysis. It was found that Alphaproteobacteria had the lowest abundance in summer and the highest abundance in winter. Bacteroidetes had the lowest abundance in winter, while Planctomycetes had the highest abundance in summer. N/P ratio appeared to have some relationships with eutrophication. Tangxun Lake and Nan Lake with higher average N/P ratios (e.g., N/P = 20) tended to have a higher BEI in summer at a water temperature of 27 °C, while Yezhi Lake with a relatively lower average N/P ratio (e.g., N/P = 14) tended to have a higher BEI in spring and autumn at a water temperature of 9–20 °C. BEI and water temperature were identified as the key parameters in determining the bacterial communities of lake water. Phosphorus seemed to have slightly more impact on the bacterial communities than nitrogen. It is expected that this study will help to gain more knowledge on urban lake eutrophication.

Reducing Nutrient Loads in Northern Irish Catchments: A Modelling Approach Based on Load Apportionment and Flow Pathway Identification

2021 ◽  
Author(s):  
Russell Adams ◽  
Donnacha Doody
Keyword(s):  
Water Quality ◽  
Large Scale ◽  
Agricultural Land ◽  
Assessment Tool ◽  
Ecological Status ◽  
Point Sources ◽  
Load Reduction ◽  
Nutrient Loads ◽  
Flow Pathways ◽  
Flow Pathway

<p>Northern Ireland has been somewhat overlooked in terms of water quality modelling in the past. Many of its catchments have consistently failed to meet Water Framework Directive targets especially due to high levels of dissolved nutrients and poor ecological status. A catchment based modelling study to address this issue has not been undertaken here previously and the approach described here uses two water quality models to achieve this aim. The objectives of the modelling were firstly to identify the total load reductions (in terms of Phosphorus (P)) required to reduce in-stream loadings sufficiently for concentrations of soluble reactive P (SRP) to be reduced to achieve the WFD “Good” status levels, and secondly to split these loadings into diffuse and point components. The third objective was to identify the most likely flow pathways for the transport of the diffuse component of P to the watercourses particularly for the agricultural (mostly intensive grassland farming) land use which dominates in almost all NI catchments.</p><p>The first model applied is the Source Load Apportionment Model (SLAM) developed by the Irish EPA. This model provides a large-scale assessment of the point and diffuse load components across catchments where multiple pressures are occurring. The second model us the Catchment Runoff Flux Assessment Tool (CRAFT) which is able to back-calculate nutrient loads associated with three major flow pathways. SLAM is a static model which uses averaged loadings from diffuse agriculture and non-agricultural land uses, and point sources (where information can be obtained from various sources) to calculate N and P exports. For P, the agricultural diffuse load component uses an enhanced version of the export coefficient approach based on combining the sources of P from applied nutrients (slurry and fertiliser) and soil P. A modelling tool allows the user to evaluate load reduction scenarios where one or several components of P (both point and diffuse) are adjusted downwards to achieve the catchment’s required load reduction. The CRAFT model works on a dynamic (daily) modelling scale and has simulated sub-catchments where the SLAM model has identified the need for significant load reductions. It identifies the different reductions (P export) that are required for each flow pathway, which will then inform on the type of additional measures (e.g. sediment traps, riparian buffer strips and wetlands) that may also be required.</p><p>The initial aim of this study is to complete a pilot application to the trans-border (UK and ROI) Blackwater catchment (1360 km<sup>2</sup>). Through a review of alternative modelling options for the whole area of NI, an assessment of whether this approach is suitable for application to the entire territory can be made.</p>

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