Short-term effects of a wildfire on the water quality and macroinvertebrate community of a saline stream

2012 ◽  
Vol 21 (5) ◽  
pp. 537 ◽  
Author(s):  
Tracy A. Corbin
Keyword(s):  
Water Quality ◽  
Community Structure ◽  
Dissolved Oxygen ◽  
Total Phosphorus ◽  
Macroinvertebrate Community ◽  
Total Kjeldahl Nitrogen ◽  
Short Term ◽  
Reactive Phosphorus ◽  
Kjeldahl Nitrogen ◽  
Fire Conditions

The effects of a wildfire on the water quality and macroinvertebrate community of a saline stream in a semiarid, predominantly cleared catchment were investigated. Samples collected for 12 months following the fire were compared with pre-fire conditions. Small increases in filterable reactive phosphorus, total Kjeldahl nitrogen, total phosphorus, colour and turbidity and decreases in dissolved oxygen were recorded the day after the fire; however, most concentrations returned to pre-fire conditions within 2–3 months. Increases in nutrients were likely due to the deposition of ash, smoke and debris. Total phosphorus and total Kjeldahl nitrogen in the lower part of the catchment remained significantly higher for the year after the fire. No fire-related changes in the macroinvertebrate community structure were apparent. Reduced rainfall following the fire, the predominantly cleared catchment and the presence of a saline-tolerant macroinvertebrate assemblage all contributed to the reduced effects from the fire.

scholarly journals Influence of environmental variables on macroinvertebrate community structure in Lianhuan Lake

2021 ◽  
Author(s):  
Qianming Dou ◽  
Xue Du ◽  
Yanfeng Cong ◽  
Le Wang ◽  
Chen Zhao ◽  
...  
Keyword(s):  
Community Structure ◽  
Dissolved Oxygen ◽  
Chlorophyll A ◽  
Total Phosphorus ◽  
Environmental Variables ◽  
Pearson Correlation ◽  
Macroinvertebrate Community ◽  
Limiting Factors ◽  
Ecological Environment ◽  
Lake Ecosystem

The characteristics of macroinvertebrate community structure can effectively reflect the health status of lake ecosystem and the quality of the lake ecological environment. It is of great significance to identify the limiting factors of macroinvertebrate community structure for the maintenance of lake ecosystem health. In this study, the community composition of macroinvertebrate assemblages and their relationships with environmental variables in 13 small lakes within Linhuan Lake was investigated. Self-organizing map, K-means clustering analysis, principal component analysis, pearson correlation analysis, and redundancy analysis were used to analyze the correlation and variability between macroinvertebrates community index and environmental factors. The results showed that the environmental variables (pH, total phosphorus, nitrate, water temperature, dissolved oxygen, conductivity, chemical oxygen demand, and ammonium) had a significant effect on the classification of macroinvertebrate community. Molluscs were significantly negatively correlated with pH and chlorophyll a, while annelids and aquatic insects were significantly positively correlated with chlorophyll a and dissolved oxygen. Species richness and Shannon’s diversity of macroinvertebrates were significantly negatively correlated with total phosphorus while biomass of macroinvertebrates was significantly negatively correlated with pH. High alkalinity characteristics and eutrophication of the lake have a serious impact on the macroinvertebrate community. Human interference and unreasonable industrial and surface runoff from agricultural farms destroy the ecological environment and affect the community structure of macroinvertebrate. Thus, the improvement of the macroinvertebrate’s community structure should be carried out by improving the Lianhuan Lake watershed ecological environment and controlling watershed environmental pollution.

scholarly journals Impacts of drying and reflooding on water quality of a tropical semi-arid reservoir during an extended drought event

2019 ◽  
Vol 31 ◽  
Author(s):  
Jéssica Nayara de Carvalho Leite ◽  
Vanessa Becker
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Chlorophyll A ◽  
Total Phosphorus ◽  
Algal Biomass ◽  
Soluble Reactive Phosphorus ◽  
Drought Event ◽  
Reactive Phosphorus ◽  
Semi Arid

Abstract Aim The aim of this study was to analyze the water quality of a tropical, semi-arid reservoir after a reflooding. In terms of impact on water quality after a drought event, it is expected that there will be improvements with the reflooding. Less algal biomass, increased water transparency, decreased turbidity and low nutrient concentration. Methods This study was performed in a tropical, semi-arid man-made lake (Dourado Reservoir), during an extended drought period. This study consisted of a comparison of three distinct periods determined by water accumulation. The limnological variables, including water transparency, turbidity, electrical conductivity, pH, total phosphorus, soluble reactive phosphorus, and chlorophyll-a were analyzed. A principal component analysis (PCA) was also performed to verify the patterns of the variables in relation to the sample units in the studied periods. Results After water renewal, there was an expressive reduction in chlorophyll-a. Electrical conductivity, pH, and turbidity variables also reduced after the reflooding, indicating an improvement in water quality. There was no reduction in total phosphorus and soluble reactive phosphorus after the reflooding compared to the previous periods. Conclusions The significant reduction in algal biomass after reflooding in Dourado indicates water quality improvement in terms of eutrophication due to the change of the trophic state from eutrophic to mesotrophic.

Municipal wastewater characteristics at Irtah pumping station in the Tulkarem city

2000 ◽  
Vol 42 (1-2) ◽  
pp. 337-340 ◽  
Author(s):  
H.Q. Shaheen
Keyword(s):  
Dissolved Oxygen ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Total Suspended Solids ◽  
Ammonia Nitrogen ◽  
Total Kjeldahl Nitrogen ◽  
Pumping Station ◽  
Kjeldahl Nitrogen ◽  
Sodium And Potassium ◽  
Mixed Samples

Wastewater flow samples were collected at 2-hour intervals for one week during the month of October 1998 at the Irtah wastewater pumping station in the Tulkarem city. The station collects about 32% of the wastewater of the Tulkarem city and 25% of the Tulkarem camp. The samples were mixed on 24-hour basis and tested for the pollution parameters BOD5, COD, total suspended solids, orthophosphate, total Kjeldahl nitrogen, ammonia nitrogen, nitrate, calcium, sodium and potassium. At the 2-hour intervals the wastewater flow was tested for conductivity, temperature, pH, and dissolved oxygen. The variation of the strength of these parameters and its relation to the flow values are observed and evaluated. The produced organic strength versus the flow and the 24-hour mixed samples are presented and commented upon.

scholarly journals A model for cost estimation of system for piggery wastes treatment ponds: a case study

2003 ◽  
Vol 23 (3) ◽  
pp. 463-473
Author(s):  
Waldir Medri ◽  
Rejane Helena Ribeiro da Costa
Keyword(s):  
Total Phosphorus ◽  
Cost Estimation ◽  
Water Hyacinth ◽  
Treatment System ◽  
Fecal Coliforms ◽  
Design Parameters ◽  
Total Kjeldahl Nitrogen ◽  
System A ◽  
Kjeldahl Nitrogen

This article presents the results from the monitoring of a system of ponds for the treatment of piggery wastes, carried out during a 20 months period, with the objective to determine design parameters for the optimization of the treatment system. A series composed of two anaerobic ponds, one facultative pond and one water hyacinth pond, gave an efficiency of 97% in the removal of BOD5, 93% for total phosphorus, 91% for total Kjeldahl nitrogen and a removal of 7 log units for fecal coliforms. A model of the optimization incurred in the treatment of these wastes was developed, within economic concepts.

scholarly journals Economic evaluation of the impacts of water quality on fishery production in the Estuary Complex of Santos, São Vicente and Bertioga cities, in southeastern coast of Brazil

2020 ◽  
Vol 56 (1) ◽  
pp. 99-110
Author(s):  
Victor Carrozza Barcellini ◽  
Ângela Tavares Paes ◽  
Simone Georges El Khouri Miraglia
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Total Phosphorus ◽  
Linear Models ◽  
Quality Parameters ◽  
Sao Paulo ◽  
Water Quality Parameters ◽  
São Paulo ◽  
Fishing Activity ◽  
Monetary Loss

The present study proposes a diagnosis of water quality and fishery production in the Estuarine Complex of Santos, São Vicente, and Bertioga Cities as a requirement for economic valuation of water pollution impacts on fishing production. In the study period (2009–2014), three water quality parameters were identified (dissolved oxygen, total phosphorus, and nitrate), which occurred more frequently in non-conformity with Brazilian water standards, according to reports released by the Environmental Company of São Paulo State (Companhia Ambiental do Estado de São Paulo — CETESB). For data collection of fishery production, data from the monitoring of Institute of Fisheries of Santos City (Instituto de Pesca de Santos) were used, and 15 species were identified with higher occurrence in the study area. The relation between water quality parameters and fishery production was analyzed with mixed linear models, in which significant values for dissolved oxygen parameters, total phosphorus (positive relation), and nitrate (negative relation) were found. Environmental valuation considered only the direct use values (DUV) component of the valuation of fishery production variation in relation to water quality variation. For this purpose, the Marginal Productivity Method (MPM) of the dose-response function was used, which resulted in a range of monetary loss between US$ 24,760,550.22 and US$ 60,635,978.78. The obtained values represent only a portion of the valuation of economic and environmental loss in the fishing activity (part of DUV). Therefore, economic value calculated is conservative, and although it did not reached the total amount corresponding to all the impacts caused by poor water quality, given the limitations of methods and study period, the obtained values represent the minimum environmental monetary loss.

scholarly journals Multi-Scale Analysis of the Dependence of Water Quality on Land Use Using Linear and Mixed Models

Water ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 2618
Author(s):  
Johann Alexander Vera Mercado ◽  
Bernard Engel
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Suspended Solids ◽  
Spatial Scales ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Quality Parameters ◽  
Total Kjeldahl Nitrogen ◽  
Nitrate And Nitrite ◽  
Kjeldahl Nitrogen

Land use influences water quality in streams at different spatial scales and varies in time and space. Water quality has long been associated with agricultural and urban land uses in catchments. The effects of developed, forest, pasture, and agricultural land use on nitrogen, nitrate, and nitrite (NNN); total phosphorus (TP); total suspended solids (TSS); chemical oxygen demand (COD); dissolved oxygen (DO) and total Kjeldahl nitrogen (TKN) concentrations and their sensitivity were quantified to spatial pattern differences. The linear mixed modeling framework was used to examine the importance of spatial extent on models with water quality parameters as the response variable and land use types as the predictor variable. The results indicated that land use categories on different water quality parameters were significant and dependent on the selected spatial scales. Land use exhibited a strong association with total phosphorus and total suspended solids for close reach distances. Phosphorus is not highly soluble, and it binds strongly to fine soil particles, which are transported by water via runoff. Nitrogen, nitrate, and nitrite, dissolved oxygen, chemical oxygen demand, and total Kjeldahl nitrogen concentrations were better predicted for further reach distances, such as 45 or 50 km, where the best model of nitrogen, nitrate, and nitrite is consistent with the high mobility of NO3−.

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