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Registros recuperados: 18
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Biodiversity and sustainable management of a tropical wetland lake ecosystem: A case study of Lake Kanyaboli, Kenya OceanDocs
Rasowo, J.O.; Abila, R.; Manyala, J..
Lake Kanyaboli and the surrounding Yala swamp wetland has been recognized as an important biodiversity hotspot. Recent population genetic and phylogenetic studies confirm the evolutionary importance of Lake Kanyaboli (Kenya) in preserving the cichlid fish fauna of Lake Victoria. The adjoining Yala swamp harbours the endangered swamp antelope Sitatunga (Tragecephalus spekii) and several papyrus endemic birds. The lake and adjoining swamp play a critical role in the livelihood of the local communities who heavily depend on the wetland resources. Current ongoing large scale land use changes within the swamp threaten the ecological integrity and functioning of this highly dynamic wetland ecosystem. It is therefore imperative that proper management and...
Tipo: Proceedings Paper Palavras-chave: Wetlands; Biodiversity; Resource conservation; Inland waters; Ecosystem management; Ecological crisis; Tropical environment; Population genetics; Phylogenetics; Lake fisheries; Freshwater fish; Aquatic birds; Land use.
Ano: 2006 URL: http://hdl.handle.net/1834/2126
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Degradation of the riparian wetlands in the Lake Victoria basin - Yala swamp case study OceanDocs
Thenya, Thuita; Wassmann, Reiner; Verchot, Louis; Mungai, David.
Land degradation is as a result of broad range of scales and factors, which include biophysical, climatic, demographic and socio-economic. The aim of this paper was to provide an analysis of wetland utilisation, ecosystem degradation and their effect on the Lake Victoria (Kenya) ecosystem. This involved analysis of socioeconomic and remote sensed data. The main sources of wetland degradation in the Lake Victoria basin were identified as (1) farming activities, (2) grazing and macrophyte harvesting and (3) coupled with catchment degradation-deforestation. These factors were closely related to the demographic dynamics and unsustainable land utilisation practices. Socio-economic data provided valuable insight on the pattern of wetland utilisation and possible...
Tipo: Proceedings Paper Palavras-chave: Riparian environments; Degradation; Wetlands; Inland waters; Catchment area; Remote sensing; Environmental effects; Socioeconomic aspects; Resource development; Sediment transport; Silting; Water pollution; Wetlands; Deforestation; Natural resources; Utilization; Land use; Pollutants.
Ano: 2006 URL: http://hdl.handle.net/1834/5313
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Effects of land use changes on bird composition along River Njoro: A watershed of Lake Nakuru OceanDocs
Shivoga, W.A.; Ngugi, F.M.; Muchiri, M.S.; Miller, S.N..
The rift valley lakes and their associated watersheds are home for millions of resident and migratory waterfowl. However, they have been recently challenged by land use changes. Lake Nakuru (Kenya) supports diverse biological resources of global, regional and national importance. It is saline and River Njoro is its main source of freshwater. Deforestation, cultivation and urbanization in vital watershed areas have altered the hydrological regime of River Njoro. There is need to preserve and restore aquatic, riparian and terrestrial biological diversity in the watershed to be able to restore and maintain ecological health of Lake Nakuru. The impact of these recent land use changes on birds in the River Njoro Watershed is of concern to conservationists. This...
Tipo: Proceedings Paper Palavras-chave: Land use; Aquatic birds; Urbanization; Resource conservation; Resource management; Migratory species; Environment management; Protected resources; Watersheds; Lake basins; Inland waters; Environmental effects; Species diversity; Riparian environments; Aquatic birds; Urbanization; Resource conservation; Resource management; Http://aims.fao.org/aos/agrovoc/c_8898; Http://aims.fao.org/aos/agrovoc/c_8088; Http://aims.fao.org/aos/agrovoc/c_6523; Http://aims.fao.org/aos/agrovoc/c_6524.
Ano: 2006 URL: http://hdl.handle.net/1834/1499
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Effects of physical mixing on the environment of satellite lakes and dams of lake Victoria, Kenya OceanDocs
Guya, F.; Wakwabi, E.; Jembe, T.; Osumo, W.; Sitoki, L.; Ogutu, Z..
In the Lake Victoria (Kenya) catchment are found several small lakes and dams. The satellite lakes and dams are important aquifers and buffer zones for the lake. Besides the water bodies are important water sources both for livestock and domestic use. A study conducted in the water bodies between January 2003 and December 2004 showed that effects of eutrophication are wide spread in the lakes and dams. An investigation of primary productivity and effects of physical mixing and material transport was done. In Lake Sare, Lake Victoria waters are transported to the satellite lake during both day and night through Goye causeway that connects the two. The water bodies have higher rates of primary productivity than Lake Victoria. Spatial extent of oxygen...
Tipo: Proceedings Paper Palavras-chave: Dams; Eutrophication; Water reservoirs; Inland waters; Water bodies; Eutrophication; Primary production; Lake basins; Water mixing; Artificial lakes; Oxygen depletion; Endemic species; Pollution effects; Eutrophication; Dams; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_2121.
Ano: 2006 URL: http://hdl.handle.net/1834/1494
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Establishment, spread and impact of Neochetina spp. weevils (Coleoptera: Curculionidae) on Water Hyacinth in Lake Victoria, Kenya OceanDocs
Njoka, S.W.; Ochiel, G.S.; Mailu, A.M.; Gitonga, W..
The Kenya Agricultural Research Institute imported 12,300 curculionid weevils (Neochetina spp.) from diverse sources, for biological control of water hyacinth in Lake Victoria, as part of the World Bank-funded Lake Victoria Environmental Management Project in East Africa. In addition to the rearing and quarantine facility at Muguga, a second rearing facility was established in 1996 at Kibos, near Lake Victoria. The Kibos rearing facility and two community rearing facilities at the lakeshores, have produced approximately 100,000 adult weevils and 42,000 weevil eggs over a three-year period. Since January 1997, some 73,500 Neochetina weevils have been released at 29 sites and an additional 10,000 redistributed at several sites. Visual observations and...
Tipo: Proceedings Paper Palavras-chave: Environmental conditions; Environmental effects; Environmental protection; Inland waters; Biological control; Environmental conditions; Environmental protection; Inland waters; Water hyacinth; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_15898; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_15267.
Ano: 2001 URL: http://hdl.handle.net/1834/1283
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Impact of agro-industrial activities on the water quality of River Nyando, Lake Victoria Basin, Kenya OceanDocs
Raburu, P. O.; Okeyo-Owuor, J.B..
The impact of agro-industrial activities on the water quality within River Nyando, Lake Victoria Basin (Kenya) was studied at different hierarchical levels between August 1997 and June 1999. Triplicate water samples were collected on a monthly basis from various stations ranging from the source to the mouth of the river and analyzed for selected physical and chemical water quality parameters using standard analytical methods. Statistical analysis was performed using MINITAB and STATISTICA computer packages. Agricultural land use was found to be the major factor contributing to changes in water quality. Salinity and pH varied at river basin scale, turbidity, TDS and conductivity at catchment scale, while DO, alkalinity and pH at subcatchment and river reach...
Tipo: Proceedings Paper Palavras-chave: Water quality; Environmental impact; Industrial wastes; Inland waters; Rivers; Anthropogenic factors; River basin management; Statistical analysis; Physicochemical properties; Land use; Limnological data; Environmental monitoring; Resource management; Environment management; Agricultural pollution; Water quality; Environmental impact; Rivers; Statistical analysis; Land use; Environmental monitoring; Industrial wastes; Inland waters; Anthropogenic factors; Physicochemical properties; Resource management; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_7378; Http://aims.fao.org/aos/agrovoc/c_4182; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_11763; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_13330; Http://aims.fao.org/aos/agrovoc/c_6524.
Ano: 2006 URL: http://hdl.handle.net/1834/3501
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Implications of climate change on the management of Rift Valley lakes in Kenya. The case of lake Baringo OceanDocs
Ngaira, Josephine K..
Climate patterns of the World became very variable during the last half of the twentieth century. Causes of this variability/change have been identified as: Sun Spot activity, ozone depletion, decline in the solar beam, with the more pronounced especially in Africa being Increased atmospheric carbondioxide, and albedo change due to anthropogenic factors. The most affected weather elements by the above mentioned factors particularly in the tropics are Rainfall and Temperature, and the climatic environments most affected by the named weather elements are the arid and semi-arid lands which are already moisture constrained. The rift valley in Kenya, where most of the lakes are located experience Arid and Semi-Arid climate. The lakes located in this region are...
Tipo: Proceedings Paper Palavras-chave: Climatic changes; Resource management; Lake basins; Anthropogenic factors; Inland waters; Environmental impact; Water policy; Lake dynamics; Arid environments; Rainfall; Water resources.
Ano: 2006 URL: http://hdl.handle.net/1834/1472
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Lakes water quality monitoring and management programme in developing countries OceanDocs
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
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Macrophytes of Lake Victoria and succession after invasion of Water Hyacinth OceanDocs
Omondi, R.; Kusewa, Mwende.
The distribution of Lake Victoria (Kenya) macrophytes is described. Succession of macrophytes in the lake became more dramatic and dynamic after invasion of water hyacinth. The weed pushes and smothers other free-floating macrophytes like Pistia stratiotes. It then provides substrates for the emergent Vossia cuspidata, which later reduces its population by competition for light and nutrients. The noxious weed is believed to have led to extinction of Azolla nilotica in the lake.
Tipo: Proceedings Paper Palavras-chave: Aquatic plants; Ecological succession; Introduced species; Species extinction; Inland waters; Water reservoirs; Geographical distribution; Emergent vegetation; Competition; Water bodies; Aquatic plants; Water hyacinth; Http://aims.fao.org/aos/agrovoc/c_559; Http://aims.fao.org/aos/agrovoc/c_15267.
Ano: 2006 URL: http://hdl.handle.net/1834/1496
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Pêcherie démersale côtière au Sénégal. Essai de modélisation de la dynamique de l'exploitation des stocks OceanDocs
Institut de Recherche pour le Développement, Paris (France); Fall, Massal.
Français - Les traits essentiels de la côte sénégalaise, repères historiques de la pêche, communautés de pêcheurs, caractéristiques des flottes et modes d’accès à la ressource et d’interaction sont analysés. Les caractéristiques, tendances décroissantes de l’abondance,niveaux d’exploitation, mesures d’aménagement, relations interspécifiques, changements potentiels et sources de variation des stocks démersaux côtiers sont précisés. Les notions de tactiques et stratégies de pêche sont passées en revue, conceptualisées puis étudiées.Le modèle «Dynamique Conjointe Exploitation Ressource» utilisé repose sur la définition de 4 typologies. L’utilisation de méthodes de classification et de connaissances d’experts conduit à considérer 32 stocks, 31 strates, 82...
Tipo: Theses and Dissertations Palavras-chave: Fisheries; Demersal fisheries; Modelling; Stocks; Ecosystems; Community fishing; Inland waters; Marine water; Hydrologic cycle; Fishermen; Fishing fleet; Shrimp fisheries; Capture fisheries; Fisheries management; Trawling; Artisanal fishing; Fishing licenses.
Ano: 2009 URL: http://hdl.handle.net/1834/5004
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Socio-economic dimensions of conservation of wetlands in African dry lands: A case study of River Ewaso Ngiro basin in southern Kenya OceanDocs
Gichuki, Nathan N.; Macharia, Jane M..
Wetlands that occur in arid and semi-arid areas have unique characteristics and support unique biodiversity. The permanent wetlands are relatively small and isolated by large areas of dry land. There are however, numerous temporary or seasonal wetlands that contain water for only short period in the year. These wetlands contain water, a critical resource for all people, livestock, wildlife and plant life. The availability of fresh water minerals, pasture and other useful products attract humans, thereby making the wetlands to become focal points of economic development and indeed urbanization. The changing lifestyles of resident communities, such as increased focus on subsistence and commercial agriculture and sedentarization as opposed to nomadic...
Tipo: Proceedings Paper Palavras-chave: Wetlands; Inland waters; Water reservoirs; Resource conservation; Environmental protection; River basins; Watersheds; Potential resources; Resource development; Exploitation.
Ano: 2006 URL: http://hdl.handle.net/1834/4299
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The eastern Africa flamingo Lakes: Building partnerships for sustainable resource management OceanDocs
Raini, Jackson A..
The saline alkaline lakes of the Eastern Africa Rift Valley 'Flamingo Lakes' support diverse biological resources that are of global, regional, national and local importance. These lakes form the center piece of some of the world renowned national parks and conservation areas and are major feeding, staging and displaying ground for the region's Lesser flamingo (Phoeniconaias minor), Greater flamingo (Phoenicopterus ruber) and for over 70 species of water birds. Unsustainable land use practices within the basins of these lakes during the last four decades have adversely affected the environment in many ways. Notable among the effects are the diminishing forested areas, rampant soil erosion, waste disposal problems and deterioration in catchment water...
Tipo: Proceedings Paper Palavras-chave: Aquatic birds; Environment management; Man-induced effects; Saline water; Biodiversity; Land use; Inland waters; Soil erosion; Deforestation; Aquatic birds; Land use; Soil erosion; Saline water; Biodiversity; Inland waters; Deforestation; Http://aims.fao.org/aos/agrovoc/c_8898; Http://aims.fao.org/aos/agrovoc/c_4182; Http://aims.fao.org/aos/agrovoc/c_14393; Http://aims.fao.org/aos/agrovoc/c_16376; Http://aims.fao.org/aos/agrovoc/c_33949; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_15590.
Ano: 2006 URL: http://hdl.handle.net/1834/3515
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The ecological state of Lake Naivasha, Kenya, 2005: Turning 25 years research into an effective Ramsar monitoring programme OceanDocs
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 & 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
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The physical limnology of Winam Gulf and Rusinga Channel of Lake Victoria during April-May and August of 2005 OceanDocs
Alexander, R.; Antenucci, J.P.; Attwater, G..
Winam Gulf (Kenya) is a large (surface area ~ 1400 km2) and shallow (<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
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The role of the Yala swamp lakes in conservation of Lake Victoria region haplochromine cichlids: evidence from molecular genetic and trophic ecology studies OceanDocs
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
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The role of wetlands in lake ecological functions and sustainable livelihoods in lake environment: A case study on cross border Lake Jipe - Kenya/Tanzania OceanDocs
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
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Water quality trends and input loads to Lake Nakuru OceanDocs
Kulecho, Andrew; Muhandiki, Victor.
Water quality trends of Lake Nakuru, Kenya and its feeder streams were monitored in 2001-2004. Water samples were obtained from eleven stations in the lake and five points on inflowing streams. The items monitored were physico-chemical and biological components. The drainage basin was characterized by recurrence of dry spells throughout the period with water losses in the lake exceeding the amount received to cause a fall in water volume. The lake water salts content rose – conductivity and alkalinity reached 58 ms/cm and 5,200 mg/l respectively. PH was more or less constant (10.00 – 10.36). Daytime oxygen concentration in the mid-lake system rose (to greater than 20 mg/l) while remaining low in the inflow portions of the lake. On one occasion, the lake...
Tipo: Proceedings Paper Palavras-chave: Water quality; Biomass; Mortality causes; Anthropogenic factors; Phytoplankton; Pollution effects; Degradation; Man-induced effects; Inland waters; Freshwater pollution; Physicochemical properties; Inflow; Environmental monitoring; Land use; Urbanization; Environmental impact; Pollution; Freshwater.
Ano: 2006 URL: http://hdl.handle.net/1834/5312
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What is the socio-economic value of the wetlands fisheries? The case of Yala Wetland in Kenya OceanDocs
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
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