scholarly journals CHANGES IN CONCENTRATIONS OF ORGANIC MATTER IN THE MOUTHS OF THE DOTNUVELE AND SMILGA RIVERS

2018 ◽  
Author(s):  
Stefanija MISEVIČIENĖ
Keyword(s):  
Organic Matter ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Anthropogenic Activities ◽  
Precipitation Amount ◽  
Ecological Status ◽  
Sources Of Pollution ◽  
Temperature And Precipitation ◽  
Quality Of Water ◽  
The Difference

The quality of water in rivers of central Lithuania is often bad due to intensive anthropogenic activities. When rivers flow through the town’s territory, concentrated pollution, such as rainwater, industrial and productional waste water discharges, contributes to diffuse sources of pollution. If biogenic substances are the main indicators for diffuse pollution, organic matter, expressed as BOD, is the indicator for concentrated pollution. The article provides the 2013 – 2017 monitoring data on the changes of organic matter in the water of the Dotnuvele and Smilga Rivers and discusses the reasons for fluctuations in concentrations of BOD7. The aim of the research is to investigate the changes in the organic matter of the Dotnuvele and Smilga Rivers, depending on meteorological factors. For chemical analysis, water samples were taken quarterly. Water analysis was carried out by the ASU Chemical Analytical Laboratory of Water Resources Engineering Institute. The amount of organic matter (BOD7) is calculated as the difference in oxygen content after 7 days of incubation, while the amount of dissolved oxygen (O2) in the water is determined by the electrochemical probe method. The concentrations of BOD7 and O2 in the water of both rivers is compared with the criteria for assessing the ecological status of surface water bodies. The research has shown that the dissolved oxygen concentrations in rivers’ water are strongly influenced by water temperature and precipitation. The lower the temperature, the more of the dissolved oxygen is found in rivers’ water (r = -0.64). A lower precipitation amount, which reaches the rivers, increases the amount of dissolved oxygen in them (r = -0.45). The increase of BOD7 concentrations in rivers’ water was caused by higher precipitation amount (r = 0.46), higher air (r = 0.41) and lower water temperature (r = -0.41). The ecological status of the Dotnuvele River was usually good, while Smilga was average.

Effet de certains paramètres physico-chimiques sur les relations prédateurs–proies dans les populations de copépodes cyclopoïdes des mares temporaires d'eau douce

1986 ◽  
Vol 64 (1) ◽  
pp. 8-11
Author(s):  
Louise Vallières ◽  
Antoine Aubin
Keyword(s):  
Organic Matter ◽  
Body Size ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Feeding Ecology ◽  
Mineral Content ◽  
Abiotic Factors ◽  
Size Class ◽  
Regression Analyses ◽  
Physical And Chemical

Copepod populations of three temporary freshwater pools (Alnus unit, Carex unit, and Molinia unit) were studied using a standard approach (species versus abiotic factors) and a holistic one (body size and feeding ecology). Multiple regression analyses of data indicate that the physical and chemical features of water (temperature, pH, dissolved oxygen, mineral content, and depth) explain 62 to 98% of the variability of carnivorous copepods, while the abundance of their prey accounts for much less. No size class of prey seems to be preferred. The abundance of decaying organic matter, typical of such pools, would result in an overabundance of prey. Predators would then be under the control of nonalimentary factors.

scholarly journals Disentangling the Effect of Seasonal Dynamics on Meiobenthic Community Structure From River Matla of Sundarbans Estuarine System, India

2021 ◽  
Vol 8 ◽  
Author(s):  
Moumita Ghosh ◽  
Sumit Mandal
Keyword(s):  
Organic Matter ◽  
Dissolved Oxygen ◽  
Sedimentary Environment ◽  
Ecological Status ◽  
Principal Component ◽  
Future Research ◽  
Taxonomic Structure ◽  
Estuarine System ◽  
Entire Study ◽  
Functional Attributes

In estuarine sediment, meiobenthos serve as an excellent candidate to perform a range of ecosystem services. However, even though the taxonomic sufficiency of meiobenthos in detecting spatiotemporal gradients is well recognized, very little is known about their functional attributes in response to environmental descriptors. To bridge this knowledge gap, the taxonomic structure and trait-based functional diversity patterns of meiobenthic assemblage, focusing on nematode species composition, were assessed for the first time from the unexplored central sector of Sundarbans Estuarine System (SES). Sediment samples were collected seasonally (monsoon, winter, spring, and summer) selecting a total of eight stations across River Matla (the widest and longest river of SES). Distinct seasonal successional patterns had been observed in meiobenthic abundance modulated by seasonal alteration in the sedimentary environment (PERMANOVA, p < 0.05). Our study revealed a strong preponderance of meiobenthic density in spring (2978 ± 689.98 ind. 10 cm–2) and lowest during monsoon (405 ± 51.22 ind. 10 cm–2). A total of 11 meiobenthic taxa were identified with the dominance of nematodes. Altogether, 79 species of nematode belonging to 22 families had been identified across the entire study area and nematode assemblage was dominated by Sabatieria praedatrix, Sphaerolaimus balticus, Desmodora communis, Dorylaimopsis punctata, and Daptonema hirsutum. Principal component analysis depicted a distinct separation of seasons with reference to environmental variables. Distance-based redundancy analysis delineated that meiobenthic communities were mainly structured by organic matter, salinity, and dissolved oxygen concentration. Biological trait analyses of nematode assemblages were applied to gather the ecological information based on morphological and ecological characteristics. The most common morphotypes were slender body shape, clavate tail shape, striated cuticle pattern, and non-selective deposit feeders with colonizing abilities of 2–3 (c–p score in a scale from 1 to 5). Results from BIO-ENV showed that sediment organic matter and dissolved oxygen played overriding roles in shaping the functional compositions of nematodes. Thus, the characterization of meiobenthos and nematode assemblages in the context of taxonomic as well as functional attributes represents a first step toward building of baseline data which could help to evaluate the ecological status of SES and direct future research priorities concurrently.

scholarly journals Effects of Physicochemical Variables of Superficial Waters on the Abundance of the North African Freshwater Crab Potamon algeriense (Bott, 1967)

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Soufiane Fadlaoui ◽  
Ouahid El Asri ◽  
Mustapha Bouterfas ◽  
Mohammed Melhaoui
Keyword(s):  
Organic Matter ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Suspended Matter ◽  
Mountain Stream ◽  
Freshwater Crab ◽  
Physicochemical Variables ◽  
The North ◽  
Global Quality ◽  
Nitrite Nitrate

The large number of pollutants discharged into the aquatic environment may influence the physicochemical and biological qualities of the aquatic ecosystem. This study discloses the global quality of the surface waters and the effect of physicochemical variables on the abundance of the African freshwater crab Potamon algeriense inhabiting Zegzel watercourse, a mountain stream in the northeast of Morocco. Physicochemical variables including streamflow, water temperature, pH, dissolved oxygen, suspended matter, chloride, calcium, magnesium, ammonia, nitrite, nitrate, orthophosphate, and organic matter were evaluated monthly for one year (October 2017–September 2018). The evaluation of the physicochemical quality showed that the waters of all the stations studied are between the excellent and good quality classes concerning all the physicochemical variables and highlights also two variations with a tendency towards degradation, one spatial from upstream to downstream and the other seasonal from the wet to the dry period. The abundance of crabs was recorded to exhibit a positive correlation with dissolved oxygen, calcium (N = 44) (p < 0.01), and magnesium. However, a negative correlation has been noticed for streamflow (N = 1) (p < 0.01), water temperature, pH, suspended matter, chloride, ammonia, nitrite, nitrate, orthophosphate, and organic matter. The results obtained reveal that besides the biotic variables, the distribution of P. algeriense also depends on these specific environmental variables.

scholarly journals KANDUNGAN BAHAN ORGANIK SEDIMEN DAN KADAR H2S AIR DI DALAM DAN DI LUAR TEGAKAN MANGROVE DESA BEDONO, KABUPATEN DEMAK

2018 ◽  
Vol 7 (1) ◽  
pp. 78-85
Author(s):  
Halimatus Sa’diyah ◽  
Norma Afiati ◽  
Pujiono Wahyu Purnomo
Keyword(s):  
Organic Matter ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Organic Material ◽  
Organic Materials ◽  
Current Speed ◽  
Survey Method ◽  
Water Sampling ◽  
Mangrove Area ◽  
Surrounding Environment

Kawasan mangrove dapat memproduksi bahan organik dari proses dekomposisi serasah yang jatuh yang menjadi penyuplai nuterien ke lingkungannya. Proses tersebut menggunakan oksigen terlarut yang apabila oksigen terlarut habis maka proses tersebut beralih ke proses dekomposisi secara anaerob yang menyebabkan terbentuknya senyawa H2S. Penelitian ini bertujuan untuk mengetahui perbedaan kandungan bahan organik sedimen dan kadar H2S air di dalam dan di luar kawasan mangrove serta untuk mengetahui hubungan kandungan kadar H2S air dengan bahan organik sedimen dan oksigen terlarut di kawasan mangrove desa Bedono. Metode penelitian adalah metode survey. Penelitian ini dilakasanakn pada bulan Mei- Juni 2017 di lokasi yang mewakili kawasan mangrove dan lingkungan sekitarnya. Data yang diukur adalah suhu air, kecerahan, kedalaman, kecepatan arus, oksigen terlarut, pH, bahan organik sedimen dan H2S air yang dilaksanakan empat kali dengan selang pengukuran dua minggu. Hasil yang didapat yaitu suhu air 28-31oC, kecerahan 14,5-68 cm, kedalaman 33-165 cm, kecepatan arus 0-0,1 m/s, oksigen terlarut , pH 5-6, bahan organik sedimen 7,73-20,27%, H2S air 0,003-0,037 mg/l. Kandungan bahan organik sedimen dan kadar H2S air tertinggi di dalam kawasan mangrove dengan rata-rata 16,36% dan 0,031 mg/l, dan terendah di luar kawasan mangrove dengan rata-rata 9,78% dan 0,01 mg/l. Kadar H2S tinggi di dalam kawasan mangrove dan lebih rendah di luar kawasan mangrove. Kadar H2S air dengan bahan organik sedimen dan oksigen terlarut berhubungan linier dengan persamaan H2S= 0,027 + 0,001BOS- 0,006 DO (r= 0,7246, BOS= Bahan Organik Sedimen, DO= Dissolved Oxygen). Mangroves produce organic matter from the decomposition of falling leaves, twigs etc, which supply nutrient to the environment. The process uses dissolved oxygen; when dissolved oxygen exhausted, it switches into anaerobic decomposition which causes the formation of H2S compounds. This study aims to knowing differences in sediment organic materials and H2S within and adjacent of mangrove areas and to determine the relation of H2S with sediment organic materials and dissolved oxygen in the mangrove areas of Bedono. Survey method is refered, and the study was conducted in May - June 2017 on locations representing mangrove areas and the surrounding environment. The data measured are water temperature, brightness, depth, current speed, dissolved oxygen, pH, sediment organic materials and H2S in the water. Sampling was conducted four times every fortnight. The result of the water temperature is  28-31 ° C, brightness 14.5 to 68 cm, 33-165 cm depth, current speed 0-0.1 m/s, dissolved oxygen 2-5,2 mg/l, pH 5-6, sediment organic material 7,73 to 20.27%, H2S 0.003 to 0.037 mg/l. Sediment organic materials and H2S were highest within the mangrove area, with an average 16.36% and 0.031 mg/l, and the lowest outside of mangrove area with an average 9.78% and 0.01 mg/l. H2S higher in the inside of  the mangrove areas compared to the outside of it. The relation of H2S with sediment organic materials and dissolved oxygen is linearly related according to the equation H2S= 0.027+ 0.001SOM- 0.006DO (r= 0.7246, SOM= Sediment Organic Materials, DO= Dissolved Oxygen).

scholarly journals Optimisation Du Choix De La Zone Du Pompage Des Eaux De Barrage Bab Louta (Taza, Maroc)

2017 ◽  
Vol 13 (12) ◽  
pp. 231
Author(s):  
Mohamed Achmit ◽  
Ghita Sbai ◽  
Abdelouahad Aouniti ◽  
Mohammed Loukili
Keyword(s):  
Drinking Water ◽  
Dissolved Oxygen ◽  
Chemical Analyses ◽  
Sources Of Pollution ◽  
Quality Of Water ◽  
Physico Chemical ◽  
Deep Profile ◽  
The City ◽  
Different Sources

In Morocco, the quality of water gathered in dams is deteriorating considerably due to different sources of pollution. One of the consequences of this situation is the presence of nutrients , particularly phosphorus and nitrogen, in the water. This, however, indicates an advanced state of eutrophisation of waters. This phenomenon causes an imbalance in the ecosystem with an anarchic development of seaweeds and an intense consumption of oxygen at the bottom of lakes. The present study aims to present the results of the optimization of the choice of the pumping area of the waters of the BAB LOUTA dam in TAZA region, Morocco. This dam is the dam that provides the city of TAZA with drinking water. The results of physico-chemical analyses (dissolved Oxygen, Turbidity, Manganese, pH, and the temperature) were taken according to a vertical deep profile for a duration that spreads from March 2016 to March 2017.

scholarly journals AVIFAUNAL DIVERSITY OF NIHARI TAWI RIVER IN DISTRICT RAJOURI, JAMMU AND KASHMIR UT, INDIA

2021 ◽  
pp. 25-27
Author(s):  
Gurdeep Kumar ◽  
Ranjan Sharma
Keyword(s):  
Dissolved Oxygen ◽  
Continuous Monitoring ◽  
Migratory Birds ◽  
Anthropogenic Activities ◽  
Ecological Status ◽  
Avian Diversity ◽  
Jammu And Kashmir ◽  
Prime Concern

An avifaunal survey was conducted at river Nihari Tawi, district Rajouri in Jammu and Kashmir for one and half year, starting from November 2015 to April 2017.The study reveals a rich avian diversity and a total of 122 species of birds belonging to 50 families were identified.As the water of the Nihari Tawi rich in dissolved oxygen and supports variety of aquatic fishes makes it suitable for birds and attracts many migratory birds in the particular region during the winters. Continuous monitoring of the avifaunal diversity is required to evaluate the ecological status of the birds and their habitats.Birds plays an important role in maintaining the ecological balance.Due to increase in urbanization and various anthropogenic activities,diversity and distribution of bird’s species is on declining trend all over the globe.Therefore,it is our prime concern to conserve the avifaunal diversity for maintaining the nature’s balance.

scholarly journals Water quality assessments of the river Gorveshwari in Dinajpur, Bangladesh

2021 ◽  
Vol 33 (1) ◽  
pp. 119-128
Author(s):  
ZANNATUL FERDOUSHI ◽  
MD ABUL KALAM AZAD ◽  
MD. SHAMIM RAHMAN ◽  
MST NAHID AKTER
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Water Level ◽  
Anthropogenic Activities ◽  
Sampling Period ◽  
Total Dissolved Solids ◽  
Total Alkalinity ◽  
Dissolved Solids ◽  
Physico Chemical ◽  
Quality Assessments

A study was carried out to assess planktonic community with some physico-chemical parameters of the Gorveshwari river in Dinajpur district of Bangladesh. Fortnight water samplings were performed at four sites. Findings revealed that water temperature, water level and transparency were within the optimal ranges- 14.33-31.23°C, 1.38-3.97 m and 43.32- 88.67cm respectively. The values of dissolved oxygen, pH, total alkalinity and total dissolved solids were found to vary 7.16 -9.32 ppm, 6.37-8.93, 28.07- 39.56 ppm and 59.87-133.74 ppm in the four sampling sites respectively. From plankton analysis, 36 genera of plankton were identified of which 27 genera were phytoplankton groups and 9 genera were zooplankton. Among them, Chlorophyceae ranked the first position with highest abundance 3.11±0.12×103cells/L. Euglenophyceae was recorded as the minor group of phytoplankton both in number and density. On the other hand, abundance of Rotifera was found to be higher in number (0.95±0.04×103cells/L), while, Crustacean larvae was noticed as scarcer group throughout the study period. Moreover, from correlation analysis it was observed that the abundance of total phytoplankton and total plankton were negatively correlated with water temperature and transparency where positively correlated with water level, pH, dissolved oxygen, total dissolved solids and total alkalinity. This study concludes that the fish production suitability of Gorveshwari river is within productive range though some anthropogenic activities affecting the aquatic biodiversity were also observed throughout the sampling period.

scholarly journals Vertical and temporal dynamics of phytoplanktonic associations and the application of index assembly in tropical semi-arid eutrophic reservoir, northeastern Brazil

2015 ◽  
Vol 27 (1) ◽  
pp. 130-144 ◽  
Author(s):  
Pryscila Cynara Soares Vieira ◽  
Maria Marcolina Lima Cardoso ◽  
Ivaneide Alves Soares da Costa
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Functional Groups ◽  
Phytoplankton Community ◽  
Temporal Dynamics ◽  
Temporal Variations ◽  
Northeastern Brazil ◽  
Quality Of Water ◽  
Q Index ◽  
Semi Arid

AimTo determine the composition and biomass of functional groups around the vertical and temporal gradient correlated with environmental conditions and apply the index Q in a water-supply reservoir.MethodsWater samples were collected monthly (n = 92) between 2009 and 2011 in two points of the dam for physicochemical and biological analysis.ResultsThe pH, dissolved oxygen and water temperature showed significant differences between the photic and aphotic zones (p<0.05). The vertical variation of dissolved oxygen and water temperature, showed a profile of stratification. The phytoplankton community was represented by 11 functional groups: S1, M, H1, Lo, P, F, SN, J, W2, MP and R.ConclusionsThe vertical variations were less pronounced than the temporal variations in the phytoplankton community. The Q index pointed out poor water quality, corresponding to the current state of eutrophication in the reservoir and it was sensitive to responsive to environmental and hydrodynamic changes in these systems, demonstrating to be an appropriate tool for monitoring and evaluating the quality of water in tropical semi-arid reservoirs.

Hydro-geochemical properties with respect to landuse in the southernmost river of Kerala

2018 ◽  
Vol 6 (1) ◽  
Author(s):  
Badusha M. ◽  
Santhosh S
Keyword(s):  
Organic Carbon ◽  
Drainage Basin ◽  
Anthropogenic Activities ◽  
Oxygen Demand ◽  
Ion Concentration ◽  
Total Hardness ◽  
Hydrogen Ion Concentration ◽  
Geochemical Properties ◽  
Quality Of Water

The hydro geochemical features of Neyyar River for a period of one year from May 2015 to April 2016 were analyzed. Six sampling sites were fixed considering physiography and present landuse pattern of the river basin. The residents in the drainage basin are primarily responsible for framing a better landuse and thereby maintain a good water and sediment regime. Geospatial pattern of the present landuse of the study area indicated that the sustainability of this river ecosystem is in danger due to unscientific landuse practices, which is reflected in the river quality as well. The parameters such as hydrogen ion concentration, electrical conductivity, chloride, Biological Oxygen Demand, total hardness and sulphate of river water and Organic Carbon of river bed sediments were analyzed in this study. The overall analysis shows that the highland areas are characterized by better quality of water together with low organic carbon, which is mainly due to better landuse and minimal reclamation. The midland and lowland areas are characterized by poor quality of water with high organic carbon, which is due to high anthropogenic activities and maximum pollutants associated with the region together with the alteration in landuse from a traditional eco-friendly pattern to a severely polluted current pattern.

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