Relevant bibliographies by topics / Eutrophication Victoria

Academic literature on the topic 'Eutrophication Victoria'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Eutrophication Victoria"

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Hecky, R. E. "The eutrophication of Lake Victoria." SIL Proceedings, 1922-2010 25, no. 1 (September 1993): 39–48. http://dx.doi.org/10.1080/03680770.1992.11900057.

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Marshall, Brian E. "Guilty as charged: Nile perch was the cause of the haplochromine decline in Lake Victoria." Canadian Journal of Fisheries and Aquatic Sciences 75, no. 9 (September 2018): 1542–59. http://dx.doi.org/10.1139/cjfas-2017-0056.

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Debate on the contribution of Nile perch (Lates niloticus) to the demise of Lake Victoria’s 500+ endemic haplochromine cichlids centers around the “top-down” and “bottom-up” hypotheses. The former suggests Nile perch destroyed the haplochromines, causing the disruption of food chains and nutrient cycling and so initiating the accelerated eutrophication of the lake. The latter proposes that haplochromines suppressed Nile perch by preying on its eggs and fry or competing with juveniles for food. A recent paper argued that accelerated eutrophication caused by a climatic event led to their collapse, allowing Nile perch to explode. However, the Nile perch population grew before haplochromines decreased, and they only collapsed once Nile perch biomass exceeded theirs. The chronology indicates that accelerated eutrophication of the lake followed rather than preceded the haplochromine collapse, suggesting that eutrophication was not its cause. A size-selective predation model developed to support the bottom-up hypothesis is discussed in light of existing data, but does not support the bottom-up hypothesis. It was concluded that the top-down model better fits the data and conforms to the law of parsimony.
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Ngupula, Godfrey William. "How Does Increased Eutrophication and Pollution in the Lake Victoria Waters Impacts Zooplankton?" Journal of Environment and Ecology 4, no. 2 (January 21, 2014): 151. http://dx.doi.org/10.5296/jee.v4i2.4397.

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Simiyu, Benard Mucholwa, and Rainer Kurmayer. "Response of planktonic diatoms to eutrophication in Nyanza Gulf of Lake Victoria, Kenya." Limnologica 93 (March 2022): 125958. http://dx.doi.org/10.1016/j.limno.2022.125958.

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Luyiga, Suzan, Sigrid Haande, Ronald P. Semyalo, Yusuf S. Kizito, Anne Miyingo-Kezimbira, Pål Brettum, Anne Lyche Solheim, et al. "How water exchange and seasonality affect the eutrophication of Murchison Bay, Lake Victoria." Limnologica 53 (July 2015): 60–73. http://dx.doi.org/10.1016/j.limno.2015.06.001.

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6

Kabenge, Martin, Hongtao Wang, and Fengting Li. "Urban eutrophication and its spurring conditions in the Murchison Bay of Lake Victoria." Environmental Science and Pollution Research 23, no. 1 (November 4, 2015): 234–41. http://dx.doi.org/10.1007/s11356-015-5675-0.

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Stager, J. Curt, Robert E. Hecky, Dustin Grzesik, Brian F. Cumming, and Hedy Kling. "Diatom evidence for the timing and causes of eutrophication in Lake Victoria, East Africa." Hydrobiologia 636, no. 1 (November 9, 2009): 463–78. http://dx.doi.org/10.1007/s10750-009-9974-7.

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GAVRILESCU, Elena, and Gilda Diana BUZATU. "Water Quality of Some Lakes in Dolj County." Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Agriculture 70, no. 2 (November 25, 2013): 370–76. http://dx.doi.org/10.15835/buasvmcn-agr:9679.

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In Dolj County there are a number of lakes that are particularly important, because they have a large quantity of water, some of them originating from hydrotechnical accumulations, and other from natural waters. In the present study, it was performed the monitoring of the water quality of the lakes in Dolj County, in the year of 2012, namely: Victoria - Geormane, Bistreţ and Caraula. The ecological conditions of the natural and artificial lakes was established based on the state of acidification, of the oxygen regime (dissolved oxygen, biochemical oxygen demand and chemical oxygen demand), the degree of eutrophication (biogenic substances, phytoplankton biomass and chlorophyll “a”) and also based on transparency. The water samples were taken from three points: tail, middle and upstream of the lake and were analyzed using high performance equipment, namely: pH-meter, spectrophotometer DR 2010, Sechi disc, BOD5 system. In terms of the degree of eutrophication, the water from the studied lakes belongs to the third category of water quality. Geormane is a natural lake which has a very good ecological status, except regarding the eutrophication, which is considerably visible. Bistret lake has a good environmental status and is visible eutrophic. Caraula lake’s water belongs to the third category of water quality, being heavily eutrophic.
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Andama, M., J. B. Lejju, and C. U. Tolo. "Late holocene trends of phytoplankton productivity and anoxia as inferred from diatom and geochemical proxies in Lake Victoria, Eastern Africa." Biogeosciences Discussions 10, no. 11 (November 12, 2013): 17663–82. http://dx.doi.org/10.5194/bgd-10-17663-2013.

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Abstract. Lake Victoria ecosystem has undergone major ecological changes in the recent decades. Sedimentary diatom analysis and Fe / Mn determined by Energy Dispersive X-ray Fluorescence (EDXRF) have provided phytoplankton (diatom) productivity and the resultant anoxia (Fe / Mn) in Lake Victoria at Napoleon Gulf during the late Holocene (1778 cal yr BP (calibrated years before present) to 2008 AD) with radiocarbon dates determined using Accelerator Mass Spectrometry standard method. The results showed that increased total diatom counts in Napoleon Gulf during the late Holocene correspond with increased Fe / Mn ratio (anoxia) in some of the profiles and not in others and in most cases those that correspond correlate very well with increased eutrophication from nitrate input (Total Nitrogen, TN). Therefore slightly increased anoxia not related to increased diatom productivity was recorded in Lake Victoria at Napoleon Gulf from the period 1778 to 1135 cal yr BP. There was slightly increased diatom productivity at Napoleon Gulf from the period 857 to 758 cal yr BP but it did not increase anoxia in the lake. The period 415 cal yr BP to 2008 AD recorded increased anoxia at Napoleon Gulf related to high diatom productivity especially from 415 to 390 cal yr BP and 191 cal yr BP to 2008 AD.
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van Rijssel, Jacco C., Robert E. Hecky, Mary A. Kishe-Machumu, Saskia E. Meijer, Johan Pols, Kaj M. van Tienderen, Jan D. Ververs, Jan H. Wanink, and Frans Witte. "Climatic variability in combination with eutrophication drives adaptive responses in the gills of Lake Victoria cichlids." Oecologia 182, no. 4 (September 14, 2016): 1187–201. http://dx.doi.org/10.1007/s00442-016-3721-3.

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Dissertations / Theses on the topic "Eutrophication Victoria"

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Odhiambo, Moses, and Joyanto Routh. "Distribution of black carbon and its impact on Eutrophication in Lake Victoria." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-130696.

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Lake Victoria (LV), is the largest tropical fresh water lake. It is however facing a myriad of challenges like eutrophication, introducing species, mass extinction and climate change. Eutrophication has mostly been seen as a result of non-point pollution from upstream agricultural areas. However, studies have found that atmospheric deposition could perhaps be the greatest cause of nutrient loading in the lake. Our study looked at black carbon as one of the factors favoring eutrophication in LV. Black carbon is a product of incomplete combustion of biomass or fossil fuel. Biomass burning is prevalent in many areas of Africa and our results have shown a great spatial and temporal variability in its concentration in sediments. The sedimentation rates calculated after analyzing 210Pb activity were 0.87, 0.53 and 0.35 g cm-2 yr-1 while the average black carbon concentrations were 4.6, 2.1 and 6.9 mg g-1 for Siaya, Kisumu and Busia, respectively. These results provided valuable information when compared to past historical events in the Lake region especially eutrophication. The study also found that soot BC has been increasing in the past 100 years suggesting the input from fossil fuels. This study elucidates the complexity of drivers of eutrophication in Lake Victoria. Nitrogen and Phosphorous from the upstream agricultural sites has long been seen as the main cause of eutrophication. Through this study we find that soot deposition in the lake coincides with the period of increased primary productivity. The Total Organic Carbon and Total Nitrogen were also analyzed and have shown increased remarkable increase with time. All these geochemical variables are a testament to the increased role of human activities on the lake’s productivity. While other studies on soot in marine environments have associated bacterial growth to nutrients attached to soot black carbon. We correlate the concentration of soot in Lake Victoria basin to blooming of cyanobacteria.
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Nordin, Emma, and Johnsson Emma Erlandsson. "Comparison of P, N and C in catchments sediments around Lake Victoria." Thesis, Linköpings universitet, Tema Miljöförändring, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-142742.

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Lake Victoria is the largest lake by area in Africa as well as the source of River Nile. The lake has undergone environmental changes during the last four decades, particularly rise in its trophic condition and decline in oxygen level, which affects the water quality and fish population. Carbon (C), nitrogen (N) and phosphorus (P) are three vital elements required for algal growth that affect eutrophication in lakes. The aim of the study is to examine the P concentrations in sediment cores retrieved from the catchment around Lake Victoria, and compare this with data on N and C concentrations from the same samples. The results show that there is a difference in P levels between the urban versus rural sites. Moreover, concentrations for P, N and C are generally high in younger sediments (near surface samples), meaning that nutrients have most likely been added due to anthropogenic activities in the catchment. In addition, factors like erosion and weathering are also likely to have contributed to nutrient inputs, and thereby the eutrophic status in Lake Victoria.
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Basapuram, Laxmi Gayatri Devi. "Lake Victoria - Carbon, Nitrogen, Phosphorus and Stable Isotope (δ13C) comparison between lake and catchment sediments." Thesis, Linköpings universitet, Tema Miljöförändring, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149283.

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Lake Victoria situated in East Africa faces an acute problem with eutrophication. Many reasons like agricultural production, industrialization, anthropogenic processes, the introduction of species, and economic activities have caused a stress to the overall well-being of the lake. Excess carbon, nitrogen, and phosphorus drive an increase in productivity which affects eutrophication. Previous studies on sediments and nutrient concentrations in the lake have concluded that nutrient concentrations increase due to release from the catchment. This study focuses on catchment sediments collected from four different sites and compares the results with sediments from two additional sites in the lake. The sediment core from Siaya indicates the highest concentrations of TOC (180 g/kg), TN (13 g/kg) and TP (17000μg/L). It is a rural site and poor agricultural practices such as the burn and slash, use of too many fertilizers, clearance of land, atmospheric deposition and precipitation increase elemental concentrations in the sediments compared to the more urban sites. In the lake sediments, the BILL core had higher concentrations of TP (430g/kg) and TN (16 g/kg) compared to the other site (LV-95) which is located far away from the margins of the lake. This core, however, had high TOC levels (180g/kg). The increase of nutrient levels in lake sediments is thought to be due to non-point sources from the catchment. Analyses of stable carbon isotope were used to infer the different organic matter source in the sediments. Based on the range of values for δ13C vs. C/N it is inferred that aquatic algal production and C4 vascular plants are the dominant sources for the organic matter input. The chemical characterization of catchment and lake sediments provides a qualitative link to nutrient influx and eutrophication in the lake.
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Martinsson, Erik, Emil Martinsson, and Sören Säf. "IWESS, an integrated water, energy and sanitation solution : A holistic approach to reach sustainability trough organic waste management for the Lake Victoria Basin, Kenya." Thesis, University of Skövde, School of Technology and Society, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-566.

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The process of allocating necessary resources like clean water, fuel/energy and food have resulted in an unsustainable use of natural resources causing problems with Soil erosion, soil fertility, desertification, deforestation, eutrophication and global warming. The purpose of this study was to gain information on the functional design of a waste management system enabling the organic components of domestic waste to be processed as useful resources while at the same time allow them to be re-circulated. The main part of this study was carried out at the Kendu SDA Hospital in the Rachyonyo district in western Kenya. For the case of this study two main objectives where chosen. The first was to develop a principal technological solution using three classed “appropriate technologies” found suitable for the purpose namely biogas, ecological water treatment systems and slow sand filtration. The second was to further analyse each included technology to further develop their potential to fit the concept. Results from the pilot facilities where then to be retrieved from the actual component selection and construction process itself, with performance analysis left for future studies.

The main purpose of the biogas system study has been to evaluate the original ideas of overall concept, details, materials and construction methods. The 1 m3 biogas system has improved significantly during the development process and is today not far from an implementation, i.e. construction on a slightly larger scale. The biogas system developed during the project has proven to have potential for digestion of both latrine and kitchen waste. Using the two as fuel for the process does not only remove a problem – it grants several benefits.

The ecological waste water treatment system main objective was to design and construct a pilot SSF-wetland. Results show that the construction process for smaller scaled SSF systems is simple and does not require trained personnel or specialized equipment and that significant cost reduction can be made by using locally available materials.

The slow sand filtration sub system concept is called PT SCX and though still in the stage of development proved to have great potential concerning both efficiency and sustainability. The PT SCX comprises the advantages of slow sand filtration with further development of individual system solutions. It was adapted to enable both integration to the IWESS solution and stand alone installations purifying even highly turbid surface water sources to drinking water quality.

The result from the study confirms the suitability of the three included technologies, ecological waste water treatment, biogas and slow sand filtration to work in an integrated system called IWESS- Integrated Water Energy and Sanitation Solution. The combined subsystems can together with source separated sewage offer full resource recovery enabling recirculation of both nutrients and water. In addition the system can be designed as a net producer of renewable and emission free energy.

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Books on the topic "Eutrophication Victoria"

1

Azza, N. G. T. The Dynamics of Shoreline Wetlands and Sediments of Northern Lake Victoria. Taylor & Francis Ltd, 2006.

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Book chapters on the topic "Eutrophication Victoria"

1

Holtzman, Josh, and John T. Lehman. "Role of Apatite Weathering in the Eutrophication of Lake Victoria." In Environmental Change and Response in East African Lakes, 89–98. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1437-2_7.

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Kling, H. J., R. Mugidde, and R. E. Hecky. "Recent changes in the phytoplankton community of Lake Victoria in response to eutrophication." In The Great Lakes of the World (GLOW), 47–66. Michigan State University Press, 2001. http://dx.doi.org/10.14321/j.ctt1bqzmb5.9.

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