Consulta: subjectFacets:"Freshwater lakes"
Registros recuperados: 10
Data/hora: 08/06/2024 11:49:25

Розподiл важких металiв у гiдроекосистемi озера Пiсочне Шацького нацiонального природного парку (Украiна)
Provedor de dados: 13
Autores: Гуменюк, Г. Б.; Редчук, Н. В.; Грубiнко, В. В.
Представлены результаты изучения аккумуляции и перераспределения тяжелых металлов (валового содержания и концентрации растворённых форм) - меди, кобальта, цинка, марганца (биогенных), а также свинца, кадмия и никеля (небиогенных) - в пресноводной экосистеме (воде, прибрежном иле) в озере Песочное Шацкого национального природного парка в зависимости от физических, гидрофизических и биологических факторов.
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Freshwater lakes; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/607

The ecological state of Lake Naivasha, Kenya, 2005: Turning 25 years research into an effective Ramsar monitoring programme
Provedor de dados: 20
Autores: Mavuti, K.M.; Harper, David.
The present paper summarises the state of ecological knowledge in the lake based upon the research of the teams of Harper &amp; Mavuti, funded by the Earthwatch Institute since 1987. It suggests how the research knowledge should drive the Ramsar monitoring programme that is now evolving.
Tipo: Proceedings Paper
Palavras-chave: Inland waters; Freshwater lakes; Tropical lakes; Ecological balance; Ecosystem management; Environment management; Environmental monitoring; Resource management; Baseline studies; Long-term changes; Environmental monitoring; Inland waters; Ecological balance; Resource management; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_34928; Http://aims.fao.org/aos/agrovoc/c_6524.
Ano: 2006
URL: http://hdl.handle.net/1834/2127

The role of wetlands in lake ecological functions and sustainable livelihoods in lake environment: A case study on cross border Lake Jipe - Kenya/Tanzania
Provedor de dados: 20
Autores: Ndetei, Robert.
Wetlands are highly productive ecosystems. Their values and functions support other ecosystems and are significant to economic development. They once covered large areas of the world and are now among the rarest and most at-risk ecosystems. They are highly valued for their recreational, educational, scientific, aesthetic, spiritual and cultural values; and form an important component of lakes that provide critical functions influencing lake ecological functions. Despite the important roles in sustaining vibrant lake ecology, supporting economic development and elevating poverty, almost all wetlands in the world are threatened by diverse human induced factors. Lake Jipe striding across the Kenya-Tanzania international boundary is an important ecosystem to...
Tipo: Proceedings Paper
Palavras-chave: Ecosystem management; Wetlands; Land use; Man-induced effects; Economic benefits; Resource management; Policies; Environment management; Resource conservation; Inland waters; Water reservoirs; Freshwater lakes.
Ano: 2006
URL: http://hdl.handle.net/1834/1492

Lakes water quality monitoring and management programme in developing countries
Provedor de dados: 20
Autores: Mutia, Silas M.
Developing Countries face an array of traditional and modern lakes water quality problems ranging from faecal contamination to toxic chemicals. Moreover, they do so in an economic environment that is severely restricted, an institutional environment which is often poorly structured, and for which the modern scientific knowledge base is frequently poorly understood and applied. Agencies in many developing countries recognize this as major impediment to sustainable development, especially as water quality has become one of the leading economic issues for the purposes of development and investment. Generally water quality programmes tend to suffer from traditional approaches, both of methodology and legal/administrative. The Consequence is that many...
Tipo: Proceedings Paper
Palavras-chave: Water quality; Water resources; Water management; Resource development; Water pollution; Environmental monitoring; Inland waters; Water reservoirs; Freshwater lakes; Developing countries; Water quality; Water resources; Resource development; Environmental monitoring; Water management; Water pollution; Inland waters; Water reservoirs; Developing countries; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_8325; Http://aims.fao.org/aos/agrovoc/c_28018; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_8320; Http://aims.fao.org/aos/agrovoc/c_8321; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_8324; Http://aims.fao.org/aos/agrovoc/c_2222.
Ano: 2006
URL: http://hdl.handle.net/1834/1474

The status of persistent organic pollutants in Lake Victoria catchment
Provedor de dados: 20
Autores: Madadi, O.V; Wandiga, S. O; Jumba, I. O.
The use of most organochlorine pesticides has been banned or restricted in the republic of Kenya under the Rotterdam and Stockholm convention due to high levels of persistence in the environment and toxicity to nontarget organisms. Studies conducted in some parts of the country have revealed that residue levels of these compounds are still in the environment. However, the residues of these compounds have not been exhaustively studied in the Lake Victoria catchment area. This study was set to investigate the residues levels of p,p-DDT, o,p’- DDE, p,p-DDD, g-HCH, D-HCH, a-HCH, Aldrin, and Dieldrin, in water samples from Lake Victoria catchment. Samples were collected during the short rain, dry and wet seasons and analysed using gas chromatography equipped...
Tipo: Proceedings Paper
Palavras-chave: Pollutants; Catchment area; Pesticides; Chemical pollutants; Toxicity; Freshwater lakes; Pollution effects; Environmental impact; Inland water environment; Pollutant persistence.
Ano: 2006
URL: http://hdl.handle.net/1834/1475

The physical limnology of Winam Gulf and Rusinga Channel of Lake Victoria during April-May and August of 2005
Provedor de dados: 20
Autores: Alexander, R.; Antenucci, J.P.; Attwater, G.
Winam Gulf (Kenya) is a large (surface area ~ 1400 km2) and shallow (&lt;20 m) bay of northeastern Lake Victoria with only one connection to the open lake through Rusinga Channel. To understand the exchange dynamics between Winam Gulf and the offshore waters of Lake Victoria and the hydrodynamics of the region, field studies were carried out from Apr. 22-May 4 and Aug. 5-16 of 2005. A meteorological station (shortwave, total radiation, air temperature, relative humidity, wind speed and direction), thermistor chain (0.75m vertical resolution) and ADCP (40 cm vertical resolution) were deployed in Rusinga Channel in a depth of 20m. Similarly, at an offshore station in northeastern Lake Victoria another thermistor chain was deployed in a water depth of 40 m...
Tipo: Proceedings Paper
Palavras-chave: Hydrodynamics; Physical limnology; Lake dynamics; Current forces; Physical oceanography; Water circulation; Inland waters; Freshwater lakes; Coupled bodies.
Ano: 2006
URL: http://hdl.handle.net/1834/1463

Hacia una cuantificación de estrés ecológico en el embalse de Rincón del Bonete (Uruguay)
Provedor de dados: 20
Autores: Amestoy, F.J.
La presente tesis respondió preguntas importantes para el conocimiento del embalse de Rincón del Bonete (EdRB) y para la obtención de los puntos de referencia para la determinación de estrés ecológico en el mismo. Los objetivos específicos comprendieron la determinación de los aspectos limnológicos más relevantes, la caracterización del embalse según su estado trófico, así como el conocimiento del estado de explotación de la especie íctica mas relevante desde el punto de vista comercial. Se determinaron indicadores que permitieron aportar información de base para cuantificar el grado de perturbación del embalse a fin de adoptar estrategias de conservación y manejo, así como definir las zonas más sensibles de impacto ambiental. Se evaluó la variabilidad...
Tipo: Theses and Dissertations
Palavras-chave: M40; Limnology; Environmental monitoring; Artificial lakes; Resource conservation; Ecological balance; Indicators; Echo surveys; Freshwater lakes; Experimental fishing; Biomass; Limnology; Environmental monitoring; Biomass; Artificial lakes; Resource conservation; Ecological balance; Http://aims.fao.org/aos/agrovoc/c_4343; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_8961; Http://aims.fao.org/aos/agrovoc/c_6523; Http://aims.fao.org/aos/agrovoc/c_34928.
Ano: 2001
URL: http://hdl.handle.net/1834/2611

What is the socio-economic value of the wetlands fisheries? The case of Yala Wetland in Kenya
Provedor de dados: 20
Autores: Abila, R.O.; Othina, A.
Wetlands in most parts of the world are under threat of over-exploitation partly because their socio-economic value is not well known. Yala Wetland, the largest freshwater wetland in Kenya, with a large part of it bordering Lake Victoria’s shoreline, faces even greater threats of extinction. This wetland measures about 17,500 ha and is host to a number of indigenous fish species, animals and plants which are exploited by the local communities for subsistence and commercial purposes.There has been pressure to reclaim portions of this wetland for agricultural activity. So far, 2,300 ha has, indeed, been drained for commercial agriculture. Furthermore, it is difficult to control effort in the exploitation of the remaining wetland resources since the...
Tipo: Proceedings Paper
Palavras-chave: Wetlands; Inland waters; Overexploitation; Socioeconomic aspects; Fishery resources; Resource management; Water reservoirs; Monitoring systems; Land use; Resource conservation; Environment management; Protected resources; Freshwater lakes; Inland fisheries; Lake fisheries; Wetlands; Inland waters; Overexploitation; Http://aims.fao.org/aos/agrovoc/c_8371; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_28014.
Ano: 2006
URL: http://hdl.handle.net/1834/1493

The role of the Yala swamp lakes in conservation of Lake Victoria region haplochromine cichlids: evidence from molecular genetic and trophic ecology studies
Provedor de dados: 20
Autores: Abila, R.; Salzburger, W.; Ndonga, M.F.; Owiti, D.O.; Barluenga, M.
Lake Kanyaboli (Kenya), a satellite lake of Lake Victoria, has been suggested as a potential refugium for haplochromine cichlids that have gone extinct in Lake Victoria. We employed mitochondrial DNA and microsatellite DNA molecular markers as well as feeding ecology studies to re- evaluate the evolutionary and ecological significance of Lake Kanyaboli haplochromines. The mitochondrial DNA and microsatellite markers revealed high genetic diversity in the endangered Xystichromis phytophagus and also the presence of mtDNA haplotypes that may have either gone extinct in Lake Victoria or have arisen in situ. Lake Kanyaboli thus acts as a ‘genetic reservoir’ for the Lake Victoria species flock. Gut content analysis revealed six trophic groups among the six...
Tipo: Proceedings Paper
Palavras-chave: Tropical fish; Genetics; Swamps; Lakes; Resource conservation; Environment management; Rare resources; Resource management; Trophic relationships; Genetic diversity; Swamps; Inland waters; Water reservoirs; Freshwater lakes; Species extinction; Ecological efficiency; Genetics; Swamps; Lakes; Swamps; Inland waters; Water reservoirs; Species extinction; Resource conservation; Resource management; Http://aims.fao.org/aos/agrovoc/c_3222; Http://aims.fao.org/aos/agrovoc/c_7544; Http://aims.fao.org/aos/agrovoc/c_4160; Http://aims.fao.org/aos/agrovoc/c_7544; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_8324; Http://aims.fao.org/aos/agrovoc/c_17744; Http://aims.fao.org/aos/agrovoc/c_6523; Http://aims.fao.org/aos/agrovoc/c_6524.
Ano: 2006
URL: http://hdl.handle.net/1834/2130

The abundance, biomass and composition of pelagic ciliates in East African lakes of different salinity and trophy
Provedor de dados: 20
Autores: Yasindi, A. W.; Taylor, W. D.
Planktonic ciliates were studied in 17 tropical East African lakes of different salinity and trophic status. Oligotrichs (e.g., Strombidium, Strobilidium and Halteria) and scuticociliates (e.g., Cyclidium, Pleuronema, Cristigera), dominated the ciliate communities. Conductivity and trophic status were the most important environmental variables influencing the distribution of ciliate species in East African lakes. Herbivorous oligotrichs were important in oligotrophic and mesotrophic lakes, as they are in temperate and subtropical lakes, but their importance decreased with increasing chlorophyll a concentration and conductivity. On the other hand, the importance of scuticociliates (primarily bacterivores) increased with increasing chlorophyll a and...
Tipo: Proceedings Paper
Palavras-chave: Freshwater lakes; Abundance; Biomass; Pelagic environment; Salinity; Plankton; Community composition; Oligotrophic lakes; Aquatic communities; Regression analysis; Tropical lakes; Species diversity; Plankton; Freshwater.
Ano: 2006
URL: http://hdl.handle.net/1834/5311