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Registros recuperados: 38
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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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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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Hacia una cuantificación de estrés ecológico en el embalse de Rincón del Bonete (Uruguay) OceanDocs
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
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Ownership Risk, Investment, and the Use of Natural Resources AgEcon
Bohn, Henning; Deacon, Robert T..
The effect of insecure ownership on ordinary investment and on the exploitation of natural resources is examined. Insecure ownership is characterized as a positive probability that a typical asset or its future return will be confiscated. For empirical analysis, the probability of confiscation is modeled as a function of observable political attributes of countries, principally the type of government regime in power (democratic versus nondemocratic) and the prevalence of political violence or instability. A general index of ownership security is estimated from the political determinants of economy wide investment rates, and then introduced into models of petroleum and forest use. Ownership risk is found to have a significant, and quantitatively important...
Tipo: Working or Discussion Paper Palavras-chave: Ownership security; Investment; Resource conservation; Resource /Energy Economics and Policy; Q32; Q23; O00.
Ano: 1997 URL: http://purl.umn.edu/10710
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Artes de Pesca 1 (artes de malla): guía didáctica OceanDocs
Costa Labandera, M.N.; Dragonetti Saucero, J.P.; Fernández Amorín, S..
La pesca es una de las actividades humanas más antiguas. Los registros de su práctica se remontan a varios miles de años. Los productos que de ella se obtienen juegan un importante papel en la dieta humana como fuente de proteína animal, minerales y ácidos grasos esenciales, entre otros. La inmensidad del océano y su biodiversidad, dio lugar por mucho tiempo a la creencia de que el mar era una fuente ilimitada de recursos, capaz de sustentar la población humana indefinidamente. Nada parecía alertar sobre la necesidad de usar métodos de pesca racionales, ni sobre las serias consecuencias ambientales que puede conllevar la actividad pesquera. El perfeccionamiento de buques pesqueros y de las técnicas de navegación determinó un explosivo crecimiento de la...
Tipo: Book Palavras-chave: Fishing gear; Gear selectivity; Fishery resources; Resource conservation; Fishing gear; Fishery resources; Resource conservation; Http://aims.fao.org/aos/agrovoc/c_2946; Http://aims.fao.org/aos/agrovoc/c_2942; Http://aims.fao.org/aos/agrovoc/c_6523.
Ano: 2006 URL: http://hdl.handle.net/1834/2000
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Impact du milieu sur les nourricieres de poissons plats de la Baie de Seine ArchiMer
Duval, P.
This study has two objectives: (1) the knowledge of spatial and temporal characteristics of flat fish nursery grounds, and, (2) the determination of natural or man-induced factors affecting these nurseries: hydrodynamics, sediment properties, predation, competition, water quality, pollution. To protect these grounds the author proposes a fisheries management plan and an impact study before all port installations or all coastal equipment use.
Tipo: Text Palavras-chave: Resource conservation; Predation; Juveniles; Flatfish fisheries; Pollution effects; Environmental impact; Estuarine fisheries; Nursery grounds.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1321.pdf
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Conservação de recursos naturais e as políticas públicas: a questão dos desmatamentos e queimadas na Amazônia. Repositório Alice
FERREIRA, C. A. P..
1999
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Recurso natural; Conservação; Queimada; Desmatamento; Política florestal; Política pública; Floresta; Amazônia; Brasil; Natural resources; Resource conservation; Burning; Deforestation; Forestry policies; Forests.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/394994
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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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Farmers' Practices and Soil and Water Conservation Programs Open Agri
International Crops Research Institute for the Semi-Arid Tropics.
Palavras-chave: Watersheds; Bunding; Soil conservation; Soil degradation; Resource conservation; Participation; Land resources; Water harvesting; Subsidies; Moisture conservation.
Ano: 1991 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4094
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Dendrogene-genetic conservation within managed forest in Amazonia. Repositório Alice
KANASHIRO, M.; DEGEN, B.; THOMPSOM, I. S..
1999
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Floresta; Recurso genético; Conservação de recurso; Manejo sustentável; Projeto; Amazônia; Brasil; Dendrogene; Genetic resource; Resource conservation; Forest; Sustainability.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/394972
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Dynamique des populations marines exploitées. Tome 1. Concepts et modèles ArchiMer
Laurec, Alain; Le Guen, Jean-claude.
This book constitutes the first of a series of three volumes, the purpose of which is to cover the principal methods used in fish population dynamics. It is devoted to the definition of the main concepts, ami the presentation of the usual mathematical models. The second volume will deal with the fitting of the models, and the estimation of parameters. The third will be devoted to sampling problems. These volumes will be recollections of communications presented during ad hoc seminars, hold in Brest (GSG/COB) in 1980 and 1981. The first part deals with the basic concepts related to the two components whose relationship is being described by the population dynamics, namely the fish stock, to its relations with biological populations, and to the partition of...
Tipo: Text Palavras-chave: Pêche; Conservation de la ressource; Modèle mathématique; Dynamique des populations; Gestion de stock; Resource conservation; Mathematical models; Fishery resources; Stock assessment; Population dynamics.
Ano: 1981 URL: https://archimer.ifremer.fr/doc/1981/rapport-1126.pdf
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La pesquería de la concha prieta (Anadara tuberculosa y Anadara similis) en el 2009: indicadores pesqueros y condición reproductiva en la zona sur y norte de Ecuador OceanDocs
Mora, E.; Moreno, J.; Jurado, V.; Flores, L..
Un análisis de los principales indicadores pesqueros (CPUE, esfuerzo y talla media de captura) fue realizado en base a información obtenida del seguimiento de la pesquería de la concha prieta durante el año 2009 en los sitios de desembarque más importantes. Los puertos de San Lorenzo y Hualtaco registraron los desembarques más altos (8.8 y 4.8 millones de conchas, respectivamente). Los rendimientos en CPUE oscilaron entre 95 y 122 conchas/conchero/día pesca,mientras que el esfuerzo promedio se encontró entre 38 y 331 concheros/día pesca. El porcentaje de conchas no comerciales fue superior al 45% (A. tuberculosa) y a 35% (A. similis) en cada puerto de desembarque. La condición reproductiva fue muy variable a lo largo del año en relación a los estadios de...
Tipo: Journal Contribution Palavras-chave: Cockle fisheries; Fishery surveys; Catch/effort; Sexual maturity; Size composition; Resource conservation.
Ano: 2010 URL: http://hdl.handle.net/1834/4795
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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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The potential role of constructed wetlands in protection and sustainable management of lake catchments in Kenya OceanDocs
Oketch, M. A..
Constructed wetlands are man-made ecosystems, which are specially designed for treatment of wastewater and non-point source pollution. Constructed wetland technology is gaining popularity due to its economically and environmentally sound attributes as a wastewater management option. Freshwater lakes in Kenya are under threat from degradation as human populations in the catchment areas increase, demands for natural resource extraction grow and urbanization and industrialization intensify. Consequently, there is increased surface runoff, causing sedimentation and eutrophication and ultimately deterioration of water quality, habitats and biodiversity. This trend requires integrated and sustainable water resource management strategies. Strategies for...
Tipo: Proceedings Paper Palavras-chave: Waste water; Wetlands; Catchment area; Resource conservation; Environment management; Resource management; Resource conservation; Waste water; Resource conservation; Resource management; Resource conservation.
Ano: 2006 URL: http://hdl.handle.net/1834/1470
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Explotación, usos y estado actual de la Cigua o Burgao Cittarium pica (Mollusca: Gastropoda: Trochidae) en la Costa continental del Caribe colombiano OceanDocs
Osorno Arango, A.; Díaz Merlano, J.M..
Exploitation, uses and current status of the West Indian topshell Cittarium pica (Mollusca: Gastropoda, Trochidae) along the Colombian Caribbean coast. The West Indian topshell, Cittarium pica is a common and conspicuous gastropod that thrives in Caribbean intertidal rocky shores and has been used for food by men since pre-Columbian times. Although, the exploitation of this resource is practiced only by artisanal fishermen and mainly for self-consumption, its abundance has noticeably reduced in the last ten years, so the species has been included in the endangered animal lists of several Caribbean countries, including Colombia. The present study was carried out to assess the current status of the population of C. pica along the Colombian Caribbean mainland...
Tipo: Journal Contribution Palavras-chave: Marine molluscs; Resource conservation; Resource conservation; Http://aims.fao.org/aos/agrovoc/c_6523.
Ano: 2006 URL: http://hdl.handle.net/1834/1974
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Notas sobre a ocupação de áreas primevas. Repositório Alice
PIRES, J. M..
1986
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Colonização; Ocupação; Desenvolvimento regional; Conservação de recurso; Amazônia; Brasil; Rural settlement; Land management; Regional development; Resource conservation.
Ano: 1986 URL: http://www.alice.cnptia.embrapa.br/handle/doc/394736
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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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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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Conservação e avaliação de fruteiras tropicais no Amazonas. Repositório Alice
SILVA, S. E. L. da; SOUZA, A. das G. C. de; SOUSA, N. R.; LIMA, R. M. B. de; NUNES; C. D. M..
O objetivo deste trabalho e conservar e avaliar especies frutiferas regionais e exotica. Em media, as especies em producao tem apresentado numero de frutos por planta e peso medio de: 172g e 188g, Pouteria caimito; 16g e 965g, Theobroma bicolor; 51g e 234g, Eugenia stipita; 91g e 11g, Myrciaria dubia; 260g e 105g, Averrhoa carambola; 42g e 119g, Alibertia edulis. A especie Genipa americana apresentou maior incremento medio em altura de planta, de 1,13m (1993) a 4,9m (1995), e Pouteria camito, em diametro de copa, com media de 0,3m a 2,28m. Entre as especies exoticas, Garcinia mangostona apressentou, entre 1993 a 1995, altura de planta de 0,23m a 0,80m, diametro de tronco de 0,60cm a 1,58cm e diametro de copa de 0,62m (1995). O indice de sobrevivencia acima...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Árvore frutifera; Especie; Recurso vegetal; Conservacao; Brasil; Amazonas; Fruit trees; Species; Genetic resources; Resource conservation.
Ano: 1995 URL: http://www.alice.cnptia.embrapa.br/handle/doc/667388
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Impacts of CIMMYT's International Training Linked to Long-Term Trials in Conservation Agriculture: 1996-2006 AgEcon
Svitakova, Jirina; Kosina, Petr; La Rovere, Roberto.
Tipo: Report Palavras-chave: Education; Training courses; International cooperation; Research institutions; Natural resources; Resource conservation; Environmental Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/56089
Registros recuperados: 38
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