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Relationship between physico-chemical parameters and the Population Distribution of Fresh Water Snails in Amassoma Community and Niger Delta University Campuses,Bayelsa State,Nigeria

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Research in Ecology 2022年第1期4卷 1-6页

作者： Amawulu Ebenezer Akpoebiere O.Mercy Ekwuribe Department of Biological Sciences Niger Delta UniversityWilberforce IslandBayelsa StateNigeria

Evaluating the presence of fresh water snails in a location is germane in establishing a snail-borne disease control program.The purpose of the study was to see how physicochemical parameters influenced the population distribution of four fresh water snails(Lymnaea natalensis,Bulinus globosus,Biomphalaria pfeiffer,and Melanoides spp.)in the Amassoma community and Niger Delta University between March,2021 and May 2021.Snails were gathered by plucking and scooping them by hand.Snail was identified using standard pictorial keys.physicochemical of the water of the snail habitat were measured using standard in-situ apparatus across eight sites physico chemical measured were temperature,pH,conductivity,BOD,turbidity,salinity,and alkalinity.A total of 258 snails were gathered from the eight(8)different sites.In all sites,Lymnaea natalensis was more abundant.Bulinus globosus,Biomphalaria pfeiffer,and Melanoides spp.were among the other snails discovered.Lymnaea had negative correlation with pH,conductivity,BOD,and alkalinity and a positive correlation with salinity and temperature.Bulinus had a positive relationship with pH,salinity,and conductivity and a negative correlation with temperature,turbidity,BOD,and alkalinity.Biomphalaria had a positive correlation with temperature,pH,salinity,turbidity,and alkalinity Melanoides had positive correlations with Temperature,pH,salinity,BOD,and alkalinity and a negative correlation with turbidity and concentration.The was correlation between snails and snails.The presence of these snails suggests that the Amassoma village and Niger Delta University campuses are potential hotspots for a variety of snail-borne diseases.

关键词： physico-chemical parameters Population distribution Fresh-water snail Amassoma community Niger Delta University

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Temporal Variations in physico-chemical parameters of Ground Water in Kibujjo Village, Namayumba Sub-County, Wakiso District, Uganda

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Journal of Water Resource and Protection 2022年第10期14卷 665-679页

作者： Godfrey Musumba Junior Sembatya Derick Muloogi Chemistry Department St. Joseph’s Secondary School Butenga Masaka Uganda G & M Consultancy Masaka Uganda Chemistry Department St. Kizito High School Kampala Uganda Department of Energy Minerals and Petroleum Studies Mbarara University of Science and Technology Mbarara Uganda

Water is one of the essential life’s basic needs. However, the purity and quality of water from groundwater sources in developing countries are still in doubt due to contamination by different anthropogenic activities. This study assessed the temporal variations in physico-chemical parameters of water sources in Kibujjo Village, Wakiso District, Uganda. Water samples were collected from four water sources: two (2) wells and two (2) boreholes. The levels of both physical and chemical parameters were assessed using APHA standard analytical methods. The results indicated that most of the measured water quality variables did not exceed the UNBS and WHO standards for drinking water, and the majority of the water parameters positively correlated. Borehole waters had a better quality than well waters. The highest levels of most of the variables were recorded during the wet season. There was a significant statistical difference (p SO2-4 showed a significant difference in the dry season amongst the water sources but no significant difference during the wet season (p > 0.05). Therefore, water from wells is not recommended for drinking before treatment, most especially during the wet season.

关键词： Ground Water physico-chemical parameters Temporal Variation

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Monitoring of the physico-chemical parameters of the Waters of Lake Sonfonia,Municipality of Ratoma(Republic of Guinea)2021

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Journal of Environmental Science and Engineering(B) 2023年第3期12卷 105-114页

作者： Mohamed Lamine Komara Adama Moussa Sacko Aboubacar Diallo Cheick Ahmed Tawel Camara Mamadou Kabirou Bah Teacher-Researcher Department of Biology Gamal Abdel Nasser University of Conakry Republic of Guinea Laboratory technique Higher Institute of Technology of MamouRepublic of Guinea DGA-Research/ISAU Conakry 324 Republic of Guinea Director of the Biochemistry degree program at Gamal Abdel Nasser University of Conakry Republic of Guinea Center for Environmental Studies and Research(CERE) Conakry 324 Republic of Guinea

As part of the determination of the possible impact of human activities on surface waters, case of Lake Sonfonia, six sampling sites were selected according to their solicitation by the population and their exposure to probable sources of pollution. The objective of this work is to monitor the physico-chemical quality of the waters of Lake Sonfonia during the low water level (March) and during the flood period (August) of the year 2021. Two sampling campaigns of water were carried out in dry weather and two others in cold weather. parameters such as temperature, pH, EC (Electrical Conductivity), dissolved oxygen, TDS (Total Dissolved Solids) were measured in situ. Suspended matter, phosphate, nitrate, nitrite, sulphates, total iron, COD (chemical Oxygen Demand) were measured in the laboratory by the colorimetric method. Stata 15 software was applied for the statistical analysis of the data and the correlation test between the parameters gave highly significant correlations. It has been noted that the situation is not very good and that this pollution comes mainly from human activities.

关键词： Surface water physico-chemical parameters Lake Sonfonia anthropogenic eutrophication.

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physico-chemical and Structural Assessment of Akono Riparian Forest Watershed, Tributary of the Nyong Basin (Centre-Cameroon) at Different Stages of Degradation

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Journal of Environmental Protection 2024年第5期15卷 552-571页

作者： Nwamo Roland Didier Gordon Nwutih Ajonina Ndzougou Nkodo Colette Rose Tomedi Eyango Minette Department of Management of Aquatic Ecosystems Institute of Fisheries and Aquatic Sciences at Yabassi University of Douala Yabassi Cameroon Cameroon Wildlife Conservation Society Mangrove & Coastal Wetlands Research Centre Mouanko Cameroon Department of Aquaculture Institute of Fisheries and Aquatic Sciences at Yabassi University of Douala Yabassi Cameroon

Freshwater bodies are natural resources that should be exploited to the fullest, while maintaining the sustainability of ecosystems and ecosystem services which they support. Riparian forests are more important as they contain rivers which are vital sources of fresh water for local populations. However, the quality and quantity of water issued from the watershed depend on the structural state of these forests. The aim of this work was to assess the physico-chemical and structural state of the Akono gallery forest. To achieve this, fieldwork consisted of selecting six major streams of the watershed including Ndjolong, Menyeng adzap, Emomodo, Mvila, Negbe and Ossoé kobok. On each of these, two stations, one intact and one degraded, were marked by transects. The method involved measuring Hydrometric parameters (depth, length, width) of the stream and physico-chemical parameters of water in the streams while dendrometric parameters were measured along 100 m-transects laid using the point-centred quarter method modified for water bodies to collect tree, shrub and palm variables such as trunk diameter, crown diameter and height. Macrophytes and species identification were carried out using standard botanical procedures. Results showed that, the majority of physico-chemical parameters measured differed significantly between intact and degraded stations (P Pentachletra mancrophylla, whereas on degraded sites, this index was low and characterized by the relative dominance of species Piptadeniastrum africanum. Sorensen’s index (0.56) and CFA showed that the different stands were homogeneous. We can affirm that the riparian forests of Akono watershed are towards a state of stability notwithstanding the perpetuation of anthropological actions.

关键词： Akono Gallery Forest physico-chemical parameters Floristic Diversity Dendrometric parameters

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Impact of Dewatering on the Spatio-Temporal Distribution of Benthic Macroinvertebrate Communities in the Okpara River, Benin

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Journal of Geoscience and Environment Protection 2024年第2期12卷 30-43页

作者： Sylvain Tayéwo Biaou Fadéby Modeste Gouissi Armelle Sabine Yélignan Hounkpatin Zoulkanerou Orou Piami Wakili Bolatito Yessoufou Souradjou Orou Goura Nonvignon Martial Fassinou Laboratory of Ecology Health and Animal Production (LESPA) Faculty of Agronomy (FA) University of Parakou (UP) Parakou Benin Pluridisciplanary Research Laboratory for Technical Education (LARPET) University of Sciences Technologies Engineering and Mathematics of Abomey (UNSTIM) Lokossa Benin

Surface watercourses are areas of very high ecological and heritage value. Macroinvertebrates are bioindicators of the health of aquatic ecosystems. The aim of this study was to assess the effects of dewatering and re-watering cycles on benthic macroinvertebrate (BMI) communities. Two data collections were carried out at two stations (Okpara 1 and Okpara 2) on the Okpara river before and after dewatering. Thus, 8 samples of benthic macroinvertebrates and 12 physico-chemical parameters (T°C, pH, Transparency, Depth, Conductivity, Dissolved Oxygen that were measured in situ, and BOD5, COD, NH4+, NO3-, NO2- and PO43-) were assayed in the laboratory. Canonical Correspondence Analysis (CCA) was used to match physico-chemical data to MIB families. Shannon and Piélou diversity indices were used to determine the effects of dewatering on MIBs. The increase in temperature values of pH, BOD5, COD, NH4+, NO3-, NO2- and PO43-, after re-watering indicates the effect of dewatering on the quality of Okpara aquatic ecosystems. The benthic macrofauna collected consisted of 62.42% insects, 0.65% crustaceans, 6.48% molluscs, 0.72% worms and 0.14% arachnids. Whereas after re-watering, 21.67% insects, 0% crustaceans, 0.22% molluscs, 7.56% worms and 0.29% arachnids were recorded. Insects, crustaceans and molluscs were more abundant before dewatering than after. This was revealed by low abundances and taxonomic richness, as well as low Shannon index values of samples collected after re-watering.

关键词： Dewatering Benthic Macroinvertebrates Impact physico-chemical parameters Okpara Rivers Nord-Benin

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Multiple Emulsions Able to Be Used for Oral Administration of Active Pharmaceutical Ingredients: physico-chemical parameters Study of Different Phases

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Journal of Modern Physics 2020年第10期11卷 1528-1535页

作者： Louis Augustin Diaga Diouf Alphonse Rodrigue Djiboune Mamadou Soumboundou Sidy Mouhamed Dieng Papa Mady Sy Gora Mbaye Mounibé Diarra Pharmaceutical Physics and Biophysics Laboratory Faculty of Medicine Pharmacy and Odontology Cheikh Anta Diop University of Dakar Dakar Senegal Pharmaceutical Physics and Biophysics Laboratory Healthy UFR of Thies University of Thies Thies Senegal Galenic and Industrial Pharmacy Laboratory Healthy UFR of Thies University of Thies Thies Senegal

Multiple emulsions are of great therapeutic interest especially in the administration of medicines which can be inactivated by digestive enzymes;moreover the researches of formulation not being often easy, a control of the different phases physicochemical parameters would be of great interest in rapid formulations and at low cost. When formulating emulsions, the preliminary tests, also known as formulation tests, constitute a step which can be long and expensive because of the quantity of reagents that can be used. A rigorous methodology could thus be of great interest, which is at the aim of our study which consists of evaluating the physico-chemical parameters of different phases used to make thus multiple emulsions. In our study, physico-chemical parameters such as conductivity, pH, density, viscosity, and surface tension have been studied by direct measurement using equipment and also by means of suitable mounting. The results showed that the pH and the surface tension have an important role in the prediction of the stability of emulsions, these latter must be of the same order of magnitude. For all phases conductivity does not have too much interest apart from helping to determine the type of the emulsion.

关键词： Active Pharmaceutical Ingredients Multiple Emulsions Stability physico-chemical parameters

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Impact assessment of nuclear power plant discharge on zooplankton abundance and distribution in coastal waters of Kalpakkam, India

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Ecological Processes 2019年第1期8卷 295-304页

作者： A.L.Muthulakshmi Usha Natesan Vincent A.Ferrer K.Deepthi V.P.Venugopalan S.V.Narasimhan Anna University Chennai 600025India All India Council for Technical Education Nelson Mandela MargVasanth KunjNew Delhi 110067India Nuclear Agriculture&Biotechnology Division Bhabha Atomic Research CentreTrombayMumbai 400085India Chemistry Group Water and Steam Chemistry DivisionBhabha Atomic Research CentreKalpakkam 603102India.

Background:Kalpakkam coastal area serves as fishing ground,influenced by anthropogenic effluents from its surrounding populations and backwaters.Methods:The monthly abundance and distribution of zooplankton and some physico-chemical parameters were investigated in coastal waters near a nuclear power plant,Kalpakkam 2011.Zooplankton and surface water samples collected from three different locations(stations P1,P2 and P3)in the heated and non-heated parts of the coastal waters were analyzed using standard methods.Results:Among all plankton genera in the cooling water,zooplankton was observed most sensitive group to entrainment-induced stress.Thirty genera were identified over the period of the investigation.Zooplankton population followed a trend as P1>P3>P2.A clear monthly variation and slight differences among stations were observed in terms of the zooplankton genera.The investigations revealed that changes in zooplankton genera across water bodies could be associated with differing temperature.Conclusion:Our results clearly demonstrate that heated water discharge from the Madras Atomic Power Station has a negligible effect on zooplankton population at engineered canal near Plutonium Recycle Project(station P2).There is no impact on zooplankton population due to thermal effluent discharge into the coastal area(stations P1 and P3).Hence,further investigation is required to estimate the impact zone at either side during different seasons.

关键词： Zooplankton physico-chemical parameters Season Kalpakkam Nuclear power plant

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Seasonal variations of phytoplankton diversity in the Coleroon coastal waters,southeast coast of India

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Acta Oceanologica Sinica 2010年第5期29卷 97-108页

作者： Thillai Rajasekar K Rajkumar M SUN Jun Ashok Prabu V Perumal P Centre of Advanced Study in Marine Biology Annamalai University Tamil Nadu India Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Department of Biotechnology Periyar University Tamil Nadu India

The results of an investigation carried out during June 2005 to May 2007 on physico-chemical parameters,species composition and community structure of phytoplankton including Chlorophyll a（Chl-a） at the Coleroon coastal waters（Southeast coast of India） are reported.Air and surface water temperatures（℃） varied from 25.1 to 30.1 and from 24.5 to 28.5 respectively.Salinity values varied from 6 to 28.5 and the pH ranged between 7.0 and 8.3.Variation in dissolved oxygen content was from 3.1 to 7.5 mg/dm^3 while the light extinction coefficient values（LEC） ranged between 3.1 and 10.1 cm.The ranges of inorganic nutrients（μmol/dm^3） viz.,nitrate,nitrite,phosphate and silicate were 10.1-23.4,1.2-8.9,0.2-3.1 and 55-125,respectively.The ranges of Chlorophyll a（μg/dm-3） values was 2.0-7.5.Presently,124 phytoplankton species representing different classes viz：Bacillariophyceae（77）,Dinophyceae（19）,Cyanophyceae（15）,Chlorophyceae（10） and Chrysophyceae（3） were recorded.The phytoplankton cell abundance varied from 0.290 to 111.662 cells/cm-3,with peak diversity（3.38 bits/ind.） during summer season.The maximum abundance was found during summer season coinciding with the stable hydrographical conditions.The seasonal distribution and abundance of phytoplankton are discussed in relation to hydrographical parameters.Canonical Correspondence Analysis（CCA） was applied in this paper for discriminating environmental factors having effect on phytoplankton community at species level.Coleroon coastal water is subjected to long term fluctuations in physico-chemical parameters depending upon the seasonal tidal amplitude and freshwater influx resulting in a continuous exchange of organic,inorganic,plant and animal matters.

关键词： physico-chemical parameters phytoplankton species composition abundance diversity Coleroon coastal waters

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Assessment of the Impacts of Converting Natural Wetlands to Agricultural Farms. Case of Nyabugogo, Kigali City, Rwanda

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Agricultural Sciences 2023年第3期14卷 422-431页

作者： Jean Pierre Musabyimana Jean de Dieu Bazimenyera Department of irrigation and Drainage College of Agriculture Animal Sciences and Veterinary Medicine University of Rwanda Musanze Rwanda

The assessment of the impacts of converting natural wetlands to agricultural farms in Nyabugogo wetland was the main objective for this research. Considering the efficiency of agricultural activities management, operation and their maintenance in Kigali is essential to reduce the increasing environmental pollution, to raise production and to search for a sustainable method of environmental conservation, this research assesses the pollutant removal efficiency of agriculture such as crops and animal residues in order to enhance the sustainable agriculture development mainly physico-chemical characteristics and some biological characteristics and based on the preliminary assessment and review of existing literature on agriculture management systems for water resources and other environmental conservation concerns in Kigali, the research aims at contributing to the search of an appropriate agriculture management that is more efficient in terms of the increase in productivity, hence contributing to environmental sustainability. Six sampling sites were chosen in Nyabugogo wetland that is Nyabugogo, Karuruma, Kabuye (2 destinations), and Nyacyonga (2 destinations). Nyabugogo and Karuruma in the rural area, and Nyacyonga in the urban area, were chosen for the investigation of fecal coliforms. On the two first locations, Nyabugogo (80 cfu/100ml) and Karuruma (40 cfu/100ml), the study found low but not insignificant results. This is related to the dispersion of habitation in rural areas. Total Dissolved Solid (TDS) ranged from 178.1 mg/l to 179.9 mg/l at Site 1 (dry season) and subsequent test (rainy season) results ranged from 178 to 200 mg/l. The results showed different TDS in different test areas. The TDS was as low as 145.4 mg/l in the surface water of SP4 and as high as 179.9 mg/l in SP1, and in the second survey, the minimum value was 140.3 mg/l and the maximum value was 285 mg/l in SP3. Because the high turbidity levels seen along the river, in the Nyabugogo catchment, erosion protection measures should be implemen

关键词： physico-chemical parameters Water Pollution Wetland

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Micro-phytoplankton distribution and biomass in and around a channel-based fish farm: implications for sustainable aquaculture

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Acta Oceanologica Sinica 2014年第12期33卷 180-191页

作者： SADALLY S. B NAZURALLY N TALEB-HOSSENKHAN N BHAGOOLI R Department of Biosciences Faculty of Science University of Mauritius Department of Marine and Ocean Science Fisheries and Mariculture Faculty of Ocean Studies

Micro-phytoplankton density, genera composition, chlorophyllaconcentration, and physico-chemical pa-rameters were investigated at five stations （S1-near the coast; S2 and S4-at the edges of the aquaculture set-up; S3-in the center of the set-up; and S5-nearby patch of corals） in and around a coastal channel-based fish farm. The highest total micro-phytoplankton density （TPD）, including diatoms, dinoflagellates and cyanobacteria, was recorded at S3 （（6.28±2.00）×10^6 cells/L） followed by S4 （（5.87±2.81）×10^5 cells/L）, S1 （（4.92×10^5±8.70×10^4） cells/L）, S5 （（3.54×10^5±5.33×10^4） cells/L） and S2 （（2.60±1.14）×10^5cells/L）. Chlorophyll a and nutrient concentrations were highest at S3 and were positively correlated with TPD. Among the 35 genera documented in this study,Chaetoceros spp. was the dominant diatom whilePeridinium spp. was the most dominant dinoflagellate. Very low densities of toxic bloom-forming dinoflagellates were encountered during this study. These results suggest that occurrence of non-bloom densities of micro-phytoplankton, possibly due to the natural flushing of the existing lagoonal channel at the aquaculture site, yielded in little environmental impact and can represent an appropriate sustainable approach for future aquaculture de-velopment.

关键词： chlorophyll a micro-phytoplankton physico-chemical parameters sustainable aquaculture

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