scholarly journals Distribution and abundance of Chironomidae (Diptera, Insecta) in an impacted watershed in South-east Brazil

1999 ◽  
Vol 59 (4) ◽  
pp. 553-561 ◽  
Author(s):  
M. M. G. S. M. MARQUES ◽  
F. A. R. BARBOSA ◽  
M. CALLISTO
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Principal Component ◽  
Total Alkalinity ◽  
Pollution Levels ◽  
Sampling Points ◽  
Genus Richness ◽  
Nitrogen Concentrations ◽  
Chironomid Midges ◽  
Abundant Genus

Patterns of abundance and distribution of chironomid midges (Diptera, Chironomidae) in the middle Rio Doce basin were analysed. Human activities (mining, steel processing, and Eucalyptus spp. forestry) contribute to environmental degradation and low water quality in this watershed. Physical and chemical water traits (dissolved oxygen, pH, total alkalinity, electric conductivity, phosphorus and nitrogen concentrations) of 20 sampling points were used in a Principal Component Analysis (PCA) to establish the best and worst water quality. Sampling points recorded as the most polluted showed low genus richness of Chironomidae, less than five genera from the total 23, and dominance of the genus Chironomus, a bioindicator of environmental stress. Following Chironomus, the second most frequent and abundant genus was Cricotopus, whose distribution could not be related to pollution levels. The Tanypodinae sub-family showed certain sensitivity to low dissolved oxygen concentrations and high nutrients levels, and was not found at points of high pollution levels.

Impact of net pen aquaculture on lake water quality

2003 ◽  
Vol 47 (12) ◽  
pp. 293-300 ◽  
Author(s):  
J. Veenstra ◽  
S. Nolen ◽  
J. Carroll ◽  
C. Ruiz
Keyword(s):  
Water Quality ◽  
Organic Carbon ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Ictalurus Punctatus ◽  
Oxygen Demand ◽  
Total Alkalinity ◽  
Total Hardness ◽  
Army Corps ◽  
Lake Water Quality

A 3-year study was conducted by the U.S. Army Corps of Engineers assessing water quality related impacts of aquaculture of 250,000 channel catfish (Ictalurus punctatus) in floating net pens in the Rock Creek Arm of Lake Texoma, Oklahoma/Texas. Five large nylon nets suspended from a floating framework of galvanized metal anchored in open water 100 m offshore made up the net pens with fish stocking densities varying from 88 to 219 fish/m3. Water quality sampling was conducted biweekly from April to September and monthly from October to March at three locations. On all sampling dates field measurements of water temperature, pH, dissolved oxygen, and conductivity were recorded at 1 m depth intervals and water samples were collected at a depth of 0.5 m and near the bottom of the water column at each site. Sample analyses included: total alkalinity, total hardness, turbidity, chloride, sulfate, orthophosphate, total phosphorus, nitrate-N, nitrite-N, total Kjeldahl nitrogen, total organic carbon, dissolved organic carbon, biochemical oxygen demand, and chlorophyll a. The results showed statistically significant decreases in water temperature and dissolved oxygen and significant increases in field conductivity in surface waters near the net pens relative to other sampling sites. The most dramatic water quality effect observed during the study was decrease in dissolved oxygen levels near the net pens following lake turnover in the second year.

scholarly journals Cladoceran abundance in relation to water quality parameters of Chakki Talab, Bodhan, Telangana

2018 ◽  
Vol 8 (01) ◽  
Author(s):  
Vasudha Lingampally ◽  
V.R. Solanki ◽  
D. L. Anuradha ◽  
Sabita Raja
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Oxygen Demand ◽  
Total Dissolved Solids ◽  
Quality Parameters ◽  
Biological Oxygen Demand ◽  
Water Quality Parameters ◽  
Total Alkalinity ◽  
Total Hardness ◽  
One Year

In the present study an attempt has been made to evaluate water quality and related density of Cladocerans for a period of one year, October 2015 to September 2016. Water quality parameters such as temperature, PH, total dissolved solids, dissolved oxygen, biological oxygen demand, total alkalinity, total hardness, chlorides, phosphates, and nitrates are presented here to relate with the abundance of Cladocerans. The Cladoceran abundance reflects the eutrophic nature of the Chakki talab.

scholarly journals SPATIAL EVALUATION OF THE WATER QUALITY FROM THE VELHAS RIVER CHANNEL, IN THE STATE OF MINAS GERAIS

2018 ◽  
Vol 15 (30) ◽  
pp. 75-86
Author(s):  
C. C. PINTO ◽  
K. B. ALMEIDA ◽  
S. C. OLIVEIRA
Keyword(s):  
Water Quality ◽  
Principal Component ◽  
Industrial Effluents ◽  
Metropolitan Region ◽  
Multivariate Statistical ◽  
Pollution Levels ◽  
Group 3 ◽  
Group 2 ◽  
Belo Horizonte ◽  
Monitoring Stations

This study presents an evaluation of the water quality variability of 19 monitoring stations located in the channel of the Velhas river, using multivariate statistical techniques - Cluster Analysis (CA) and Principal Component Analysis/Factor Analysis (PCA/FA). Sixteen physical-chemical parameters were evaluated between January 2009 and June 2016, totalizing 27,232 valid observations. The CA grouped the nineteen monitoring stations into three groups based on the pollution levels. The PCA/FA resulted in six latent factors for group 1, four for group 2 and five for group 3, accounting for 71.44%, 65.32% and 61.69% of the total variance in the respective water quality. The factors indicated that the parameters responsible for the variations in water quality are mainly related to the release of sanitary sewage and industrial effluents and also to agriculture and livestock activities. These results reflect different water quality conditions of the Velhas River in its extension but, in fact, it is verified a greater variability of the water in the Metropolitan Region of Belo Horizonte and its downstream, justified by the different loads of pollutants received in this region, mainly the releases of domestic sewage and industrial effluents.

scholarly journals Potensi budidaya ikan di Waduk Embung Klamalu Kabupaten Sorong Provinsi Papua Barat: Kajian kualitas fisika kimia air

2013 ◽  
Vol 1 (3) ◽  
Author(s):  
Agustina Frasawi ◽  
Robert J Rompas ◽  
Juliaan Ch. Watung
Keyword(s):  
Carbon Dioxide ◽  
Water Quality ◽  
Dissolved Oxygen ◽  
Good Condition ◽  
Fish Farming ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Total Alkalinity ◽  
Physical Chemical ◽  
Papua Barat

The objective of this research was to measure and analyze the water quality parameters including temperature, brightness, pH, dissolved oxygen, total alkalinity, carbon dioxide and BOD in reservoir Embung Klamalu Sorong regency, and to know the factors that affected the water quality of Embung Klamalu. Measurement of water quality parameters was done in situ for temperature, brightness, pH and in laboratory for dissolved oxygen, total alkalinity, carbon dioxide, and BOD. The results showed the temperature at the five observation stations ranged from 26.2 to 29.8 0C, brightness 38 to 46 cm, pH 7.20 to 8.48 mg /L, dissolved oxygen from 7.20 to 8.48 mg / L, alkalinity 100 to 150 mg /L, carbon dioxide from 25.90 to 28.95 mg / L, BOD from 0.20 to 0.38. Refers to the standards of water quality according to the PP. 82, 2001, it could be concluded that water physical-chemical qualities in fish farming locations in the Village Klamalu were still in good condition. Keywords: Water physical-chemical quality, aquaculture, waduk Embung Klamalu

scholarly journals PENILAIAN KONDISI EKOLOGI PERAIRAN UNTUK PENGEMBANGAN BUDIDAYA KERANG HIJAU (Perna viridis L.) DI PESISIR KUALA LANGSA, ACEH

2018 ◽  
Vol 10 (1) ◽  
pp. 57
Author(s):  
Andi Sagita ◽  
Rahmat Kurnia ◽  
Sulistiono Sulistiono
Keyword(s):  
Principal Component Analysis ◽  
Dissolved Oxygen ◽  
Current Velocity ◽  
Principal Component ◽  
Component Analysis ◽  
Perna Viridis ◽  
Green Mussel ◽  
Sampling Points ◽  
Mussel Culture ◽  
Mussel Cultivation

Penelitian ini bertujuan untuk menilai kondisi ekologi untuk pengembangan budidaya kerang hijau di pesisir Kuala Langsa, Aceh. Data ekologi perairan dikumpulkan di 12 titik sampling pada Agustus, September dan Oktober untuk mewakili musim hujan, serta Maret, April dan Mei untuk mewakili musim kemarau. Data dianalisis dengan analisis komponen utama (principal component analysis/PCA). Suhu perairan pesisir Kuala Langsa berkisar 25,5 – 35,6 oC dengan rata-rata 30,5 ± 1,7 oC; salinitas 25,9 – 34,0 ppt dengan rata-rata 29,9 ± 1,3 oC; pH 7,0 – 9,2 dengan rata-rata 8,1 ± 0,3; oksigen terlarut 3,9 – 6,8  mg/l dengan rata-rata 5,5 ± 0,5 mg/l; kecepatan arus berkisar 0,1 – 0,9 m/s dengan rata-rata 0,3 ± 0,1 m/s; serta kelimpahan fitoplankton berkisar 1,32 x 105 sel/m3 hingga 6,86 x 105 sel/m3 dengan rata-rata 3,88 x 105 ± 1,08 x 105 sel/ m3. PCA yang diaplikasikan pada seluruh data menghasilkan dua komponen utama, yaitu PC1 dan PC2 dengan nilai akar ciri (eigenvalue) sebesar 2,096 dan 1,770; dimana PC1 secara kumulatif dapat menjelaskan ragam seluruh data sebesar 34,9% yang dibangun oleh parameter salinitas, suhu dan plankton, sedangkan PC2 sebesar 64,4% yang dibangun oleh parameter oksigen terlarut dan salinitas.  Berdasarkan analisis dengan membandingkan parameter ekologi perairan untuk budidaya kerang hijau berdasarkan literatur maka dapat disimpulkan bahwa kondisi ekologi perairan pada musim hujan dan kemarau dapat mendukung pengembangan budidaya kerang hijau di pesisir Kuala Langsa, Aceh. The research aims to assessment of waters ecology condition for the development of green mussel cultivation in coastal of Kuala Langsa, Aceh. Data of waters ecology parameters collected at 12 sampling points in August, September and October to represent the rainy season, while March, April and May to represent the dry season. Data analyzed using principal component analysis (PCA). Temperature of  waters coastal Kuala Langsa ranged from 25.5 – 35.6 oC average of 30.5 ± 1.7 oC; salinity 25.9 – 34.0 ppt average of 29.9 ± 1.3 oC; pH 7.0 – 9.2 average of 8.1 ± 0.3; dissolved oxygen from 3.9 – 6.8 average of 5.5 ± 0.5 mg/l; current velocity of 0.1 – 0.9 m/s average of 0.3 ± 0.1 m/s; and abundance of fitoplankton ranged of 1.32 x 105 cell/m3 to 6.86 x 105 cell/m3. PCA applied to all data produced two principal component is PC1 and PC2 with a eigenvalue of 2.096 and 1.770; where PC1 on cumulatively can explain 34.9% of all data collected, with built by parameters of salinity, temperature and plankton, while PC2 is 64.4% with built by parameters dissolved oxygen dan salinity. Based on the analysis by comparing waters ecology parametes for green mussel culture based on the literature, it can be concluded that the waters ecology condition can support development of green mussel culture in coastal Kuala Langsa, Aceh.

scholarly journals Hydro-chemical and microbiological characterization of Lower Cretaceous waters in a semi-arid zone Beni-Ounif syncline, South-West of Algeria

2019 ◽  
Vol 40 (1) ◽  
pp. 67-80
Author(s):  
Fatima Zahra Merzougui ◽  
Ahmed Makhloufi ◽  
Touhami Merzougui
Keyword(s):  
Water Quality ◽  
Chemical Analysis ◽  
Lower Cretaceous ◽  
Chemical Elements ◽  
Arid Zone ◽  
Principal Component ◽  
Hierarchical Cluster ◽  
Microbiological Analysis ◽  
Physico Chemical ◽  
Sampling Points

Abstract The article analyses the water quality of the Lower Cretaceous aquifer in the Beni-Ounif syncline. To this end, 42 samples were taken for physico-chemical analysis and 28 for microbiological analysis in March, May and October 2017 from 14 sampling points. The results of physico-chemical analysis were processed by multi-variety statistical analysis methods: principal component analysis (PCA) and hierarchical cluster analysis (HCA) coupled to hydro chemical methods: Piper diagram. The PCA allowed us to explore the connections between physico-chemical parameters and similarities between samples and to identify the most appropriate physico-chemical elements to describe water quality. The HCA allowed us to classify the sampling points according to the similarity between them and thus reduce them for the next follow-up analysis. Waters of the syncline are characterized by medium to low mineralization (320 < EC < 7600 μS∙cm–1 and 200 < RS < 4020 mg∙dm−3) and hardness of between 22 and 123°f. Only 19% of the samples show NO3 concentrations exceeding the Algerian standards. Microbiologically, the study reports the presence of bacteria: coliforms (<8 CFU∙0.1 dm−3), Streptococcus D (<1100 CFUꞏ0.1 dm–3), Clostridium sulphito-reducer of vegetative form (<90 CFUꞏ0.02 dm–3) and sporulate (<4 CFUꞏ0.02 dm–3), total aerobic mesophilic flora at 22°C (<462 CFUꞏ0.001 dm–3) and at 37°C (<403 CFUꞏ0.001 dm–3). It must be noted that no presence of thermo-tolerant coliforms is observed.

scholarly journals Pollution of the Ecosystem of the Rusalka City Lake with Heavy Metals / Zanieczyszczenie Ekosystemu Śródmiejskiego Jeziora Rusałka Metalami Ciężkimi

2012 ◽  
Vol 17 (1-2) ◽  
pp. 75-88
Author(s):  
Gorzysław Poleszczuk ◽  
Anna Bucior ◽  
Tymoteusz Miller ◽  
Małgorzata Tokarz
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Surface Waters ◽  
Water Saturation ◽  
Ecological Status ◽  
The Body ◽  
Total Alkalinity ◽  
City Centre ◽  
Total Hardness ◽  
Chemical Status

Abstract In the vegetation season April-October 2010, the value of and the changes in Zntot., Cutot., Cdtot. and Pbtot. concentrations in the water of the Rusalka flow-through lake (with average water retention of ca 30 days) situated in the city centre of Szczecin were determined. Water temperature, pH, concentration of dissolved oxygen (with calculation of water saturation with O2), COD-Cr and BOD5, total hardness, - 3 HCO concentration (as total alkalinity), Cl-, - 24 SO , Mntot and Fetot were also determined. The data collected may be used to evaluate the ecological and chemical status of the surface waters under investigation. As far as the ecological status of the Rusalka Lake is concerned, the investigated waters were found, based on the official criteria being in force in Poland in evaluation of the ecological and chemical status of surface waters, to conform to water quality classes I and II considering total zinc and copper concentrations, temperature and dissolved oxygen concentration (except water inflow to the lake in August) as well as BOD5, - 24 SO and Cl- concentrations and pH value; however, they were always worse than water quality class II while taking the COD-Cr values into account. Regarding the chemical status of the investigated waters, total cadmium and lead concentrations were the levels exceeding the admissible values according to the official criteria in Poland. Changes in the values of indices being investigated along water flow path allowed stating that the equilibriums between the sedimentation and the resuspension and the dissolution processes during the research period were shifted towards sedimentation in case of Zn and Cd only, as well as of the organic matter sedimenting in the form of divalent cation- and divalent anion-sorbing gels. Although three phytoplankton blooms occurred in the body of water, unfortunately weak ones, the dissimilation processes prevailed over assimilation.

scholarly journals Ground Water Quality of Gandhinagar Taluka, Gujarat, India

2008 ◽  
Vol 5 (3) ◽  
pp. 435-446 ◽  
Author(s):  
Mayur C. Shah ◽  
Prateek G. Shilpkar ◽  
Pradip B. Acharya
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Samples ◽  
Oxygen Demand ◽  
Total Alkalinity ◽  
World Health ◽  
Total Hardness ◽  
Drinking And Irrigation ◽  
Quality Of Water

Present communication deals with study of physico-chemical parameters such as pH, electrical conductivity (EC), total dissolved solids (TDS), total alkalinity (TA), calcium hardness (CaH), magnesium hardness (MgH), total hardness (TH), chloride (Cl-), fluoride (F-), sodium (Na+), potassium (K+), dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD) and sulphate (SO42-) of water samples of bore wells of forty villages of Gandhinagar taluka of Gujarat state,India. The experimental values of water samples were compared with standard values given by World Health Organization (WHO) and United State Salinity Laboratory for drinking and irrigation purposes respectively. Water Quality Index (WQI) was also calculated to know the over all quality of water samples. The statistical analysis like mean, standard deviation (SD), coefficient of variance (% CV), analysis of variance (ANOVA),t-test, coefficient of correlation (r) and regression analysis of obtained data were carried out. The results show that the quality of water is poor and quite good for drinking and irrigation purposes respectively. The variance was found significant at 1% level of significance in case of sodium and potassium content and at 5% in case of total alkalinity and dissolved oxygen among the four regions (North, South, East and West) of Gandhinagar taluka. The linear relation also established for each pair of water quality parameters of studied water samples.

scholarly journals A Method for Identifying Pollution Sources of Heavy Metals and PAH for a Risk-Based Management of a Mediterranean Harbour

Scientifica ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Ombretta Paladino ◽  
Arianna Moranda ◽  
Mahdi Seyedsalehi
Keyword(s):  
Heavy Metals ◽  
Principal Component ◽  
Point Sources ◽  
Sampling Point ◽  
Pollution Levels ◽  
Sources Of Pollution ◽  
Sampling Points ◽  
Many Sources ◽  
Ratio Matching ◽  
Sources Of Contamination

A procedure for assessing harbour pollution by heavy metals and PAH and the possible sources of contamination is proposed. The procedure is based on a ratio-matching method applied to the results of principal component analysis (PCA), and it allows discrimination between point and nonpoint sources. The approach can be adopted when many sources of pollution can contribute in a very narrow coastal ecosystem, both internal and outside but close to the harbour, and was used to identify the possible point sources of contamination in a Mediterranean Harbour (Port of Vado, Savona, Italy). 235 sediment samples were collected in 81 sampling points during four monitoring campaigns and 28 chemicals were searched for within the collected samples. PCA of total samples allowed the assessment of 8 main possible point sources, while the refining ratio-matching identified 1 sampling point as a possible PAH source, 2 sampling points as Cd point sources, and 3 sampling points as C > 12 point sources. By a map analysis it was possible to assess two internal sources of pollution directly related to terminals activity. The study is the prosecution of a previous work aimed at assessing Savona-Vado Harbour pollution levels and suggested strategies to regulate the harbour activities.

scholarly journals STANDING STOK IKAN PAWEH (Osteochillus hasselti) dan KONDISI LINGKUNGAN DANAU LUBUK SIAM DESA LUBUK SIAM KECAMATAN SIAK HULU PROVINSI RIAU

2020 ◽  
Vol 2 (1) ◽  
pp. 12-20
Author(s):  
Anggi Widya Iswara ◽  
Muhammad Fauzi ◽  
Nur El Fajri
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Standing Stock ◽  
Quality Parameter ◽  
Water Quality Parameter ◽  
Initial Population ◽  
Gill Nets ◽  
Final Population ◽  
Sampling Points

Osteochillus hasselti was commonly inhabit the Lubuk Siam Lake. A research aims to understand the standing stock of O. hasselti in that lake was conducted in July to August 2018. The fish was sampled everyday for 10 days in July and 10 days in August, in 3 sampling points (in the inlet area, in the middle of the lake, and the outlet) using gill nets. The standing stock was analyzed using Leslie method. Results shown that the initial population (No) of the fish was 315 kg and the final population (Nt) was 301 kg and the exploitation level was 8%. The water quality parameter shown that temperature was 27-28oc, clarity 6395 cm, pH = 6 and dissolved oxygen was 5.32–5.40 mg/L. Data obtained indicate the water quality in the Lubuk Siam Lake is good and it is able to support the life of O. hasselti.

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