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Registros recuperados: 343
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Etude de l’effet des facteurs du milieu sur la distribution des bactéries entériques dans la lagune de Bizerte (nord -Tunisie) OceanDocs
Boukef, I.; El Bour, M.; Bejaoui, B.; Harzallah, A.; Belhassen, M.; Mrouana, R.; Mejri, S.; Boudabous, A..
La présente étude est effectuée dans le but d’évaluer l’effet des facteurs du milieu sur la distribution des populations bactériennes entériques dans un milieu lagunaire : la lagune de Bizerte. Un échantillonnage saisonnier, (novembre 2004, février 2005, mai 2005 et août 2005), portant sur 41 stations couvrant toute la lagune ont été réalisés. Les analyses bactériologiques effectuées ont concerné l’eau et le sédiment. Les paramètres physico-chimiques de l’eau ont été mesurés in-situ simultanément aux différents échantillonnages. Aussi, les paramètres climatiques ont été fournis par une station météorologique située à proximité de la lagune. Les résultats obtenus ont révélé que les charges en bactéries sont plus importantes dans les sédiments que dans...
Tipo: Journal Contribution Palavras-chave: Abiotic factors; Ecosystems; Geographical distribution; Pollution monitoring; Public health; Water quality; Geographical distribution; Ecosystems; Public health; Water quality; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_6349; Http://aims.fao.org/aos/agrovoc/c_16061.
Ano: 2008 URL: http://hdl.handle.net/1834/3696
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X. Manejo de alimentación en estanques y alimentos amigables con el ambiente OceanDocs
Se realizaron bioensayos en agua estática para comparar los efectos de 1) la proteína dietaria y 2) el fósforo dietario sobre la acumulación de los nutrientes no asimilados en el agua de cultivo de poslarvas de Penaeus vannamei. Se evaluaron alimentos con 4 niveles de proteína dietaria (10, 18, 25 y 33%) y alimentos con 3 niveles de fósforo (0.4, 0.8 y 1.2%) con fosfato de sodio monobásico (NaH2PO4) como fuente inorgánica de fósforo. La acumulación de Nitrógeno inorgánico disuelto total (NIT) incrementó significativamente con el incremento en el nivel de proteína. El balance de masa de Nitrógeno constituyó el 87% de Nitrógeno que había entrado al medio de cultivo. La asimilación promedio de Nitrógeno en biomasa de camarón fue de 85, 71, 48 y 37% para los...
Tipo: Proceedings Paper Palavras-chave: Aquaculture; Wastewater aquaculture; Water quality; Pond culture; Aquaculture; Water quality; Http://aims.fao.org/aos/agrovoc/c_550; Http://aims.fao.org/aos/agrovoc/c_16061.
Ano: 1996 URL: http://hdl.handle.net/1834/1892
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Significations ecologiques de la variabilite des polychetes dans le golfe de Tunis OceanDocs
Zaabi, S.; Afli, A..
The coastal areas, like the gulf of Tunis, are more and more affected by the increasing anthropic activities and nutriment inputs coming from the catchments area. The polychaeta populations show different reactions in front of such conditions and constitute an effective biological tool to detect the first signs of disturbance. In total, nine stations in the north-east of the gulf, were sampled by the Van Veen grab. In this study, the model of ecological groups and biotic index was used. It appears that the general state in the studied area is overall satisfactory, except for some ones where a situation of beginning of imbalance or of transition, seems taking place.
Tipo: Journal Contribution Palavras-chave: Polychaeta; Ecological zonation; Ecosystem disturbance; Eutrophication; Indicator species; Pollution monitoring; Water quality; Ecological zonation; Eutrophication; Water quality; Indicator species; Http://aims.fao.org/aos/agrovoc/c_2465; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 2006 URL: http://hdl.handle.net/1834/4273
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Essai d'évaluation de la qualité des eaux de ruissellement du bassin versant de la lagune de Bizerte OceanDocs
Hammami, J.; Brahim, M.; Gueddari, M..
:تقع بحيرة بنزرت في الشمال التونسي وتغذيها عدة أودية تنبع من حوض يمتد على مساحة شاسعة. وتمثل التقلبات المناخية والأنشطة الإقتصادية المتزايدة في السنوات الأخيرة أهم العوامل المؤثرة في هذا الحوض وفي السيول التي تنبع منه في اتجاه البحيرة. لقد قمنا في شهر فيفري في سنة 2003 باقتـاء عينات من الماء مـن 15 مصـب لتحليلـها ( درجة الحرارة، درجة الحموضة، نسبة الأكسجين، الكلوروفيل والمواد العضوية والمعدنية الأزوتية والفسفورية) قصد دراسة هذه الظاهرة. وبينت النتائج التي تم الحصول عليها بأن مياه روافد بحيرة بنزرت تتميز عموما بنسبة عالية للأكسجين وبدرجة حموضة عادية إلى مرتفعة نوعا ما. لكن مياه مصب وادي المرازيق وقنيش والذين يقعان بالتوالي في الشمال الغربي والجنوب الشرقي للبحيرة محملا بأكثر نسبة من المواد الأزوتية والفسفورية. تظهر هذه النتيجة واضحة في التحاليل الإحصائية...
Tipo: Journal Contribution Palavras-chave: Runoff; Anthropogenic factors; Chlorophylls; Physical properties; Water quality; Chemical properties; Nitrogen; Phosphorus; Runoff; Water quality; Chemical properties; Nitrogen; Phosphorus; Anthropogenic factors; Chlorophylls; Physical properties; Http://aims.fao.org/aos/agrovoc/c_35388; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_9754; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_13328.
Ano: 2005 URL: http://hdl.handle.net/1834/1533
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Calidad físico química y bacteriológica de las aguas alrededor de la ciudad de Guayaquil 1996 - 1998 OceanDocs
Valencia, M.; Palacios, C.; Rodríguez, A..
Siendo Guayaquil una de las ciudades más pobladas del Ecuador y de gran importancia en el desarrollo industrial del país, se determinó la necesidad de llevar a cabo un estudio de la calidad de aguas del río y esteros que bordean la ciudad, debido a que los asentamientos poblacionales e industriales han crecido descargando sus desechos a esos ecosistemas, sumándose a esto el déficit de los sistemas de alcantarillado. Se presenta los resultados de un estudio realizado en el Río Guayas desde el Muelle de la Unidad Nacional hasta la zona de las Esclusas considerando 9 estaciones ubicadas en 3 perfiles perpendiculares a las riberas del río a dos niveles de profundidad, superficie y 10 m., así como de la zona del Estero Salado comprendida entre el área de...
Tipo: Journal Contribution Palavras-chave: Water quality; River water; Water analysis; Nutrients (mineral); Dissolved oxygen; Petroleum hydrocarbons; Rivers; Marshes; Freshwater pollution; Brackishwater pollution; Estuaries; Water quality; Dissolved oxygen; Rivers; Estuaries; Water analysis; Marshes; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_16064; Http://aims.fao.org/aos/agrovoc/c_4631.
Ano: 2000 URL: http://hdl.handle.net/1834/2309
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Groundwater Quality: Ghana OceanDocs
This is one of a series of information sheets prepared for each country in which WaterAid works. The sheetsaim to identify inorganic constituents of significant risk to health that may occur in groundwater in thecountry in question. The purpose of the sheets is to provide guidance to WaterAid Country Office staff ontargeting efforts on water-quality testing and to encourage further thinking in the organisation on waterqualityissues.
Tipo: Report Palavras-chave: Groundwater pollution; Water quality; Groundwater assessment; Http://aims.fao.org/aos/agrovoc/c_9000073.
Ano: 2000 URL: http://hdl.handle.net/1834/706
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Caracterización y evaluación de la calidad del agua de la Bahía de Jaramijó-Provincia de Manabí durante el año 2008 OceanDocs
Rodriguez de Morán, A..
The current research was developed in Bahia of Jaramijó in the Province of Manabí during 2008, as part of the major project: " Characterization of the Ecuadorian Coast" that has been developing by INOCAR, in order to contribute to the proper use of resources and the environment. It characterized and assesses the results obtained in the research of the quality of water of Bahía of Jaramijó, taking into consideration the averages and their behaviour in each level studied in two different season in the year (wet-dry) and in two tide condition (ebb and flow) of the different parameter physical, chemical and microbiological. During the research was established that coastal marine waters of Bahía of Jaramijó, not show pollution of organic origin neither...
Tipo: Journal Contribution Palavras-chave: Water quality; Environmental legislation; Bacteria; Pollution; Oxygen.
Ano: 2013 URL: http://hdl.handle.net/1834/5758
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Influencia del cultivo del camarón blanco (Litopenaeus schmitti) sobre los ecosistemas costeros OceanDocs
Pérez Santos, I.E.; Arencibia Carballo, G.; Capetillo Piñar, N.; Isla Molleda, M..
In this work the result of the project “Determination of the environmental impact on aquaculture in the coastal zone" is presented. Where there were sampled more than 28 points. The water quality of the ecosystems is studied around the shrimp farms like coastal lagoons, rivers and the coastal area, where the shrimp farm get the water from, and at the same time the waste water of the process is spilled. The obtained values of the analisis in water and silts give a valuation of the environmental state of the area; revealing that the lagoon Las Playas is in a not well environmental state, (salinity of 47 ppt, DQO between 3,26 and 6,14 mg/L, N-NO3 700 - 900 µg/L, ammonium 36 - 148 µg/L and silicates between the 1600 and 3400 µg/L) and silts (carbon and...
Tipo: Journal Contribution Palavras-chave: Water quality; Shrimp culture; Environmental impact; Ecosystems; Coastal zone; Water quality; Environmental impact; Ecosystems; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_2482.
Ano: 2003 URL: http://hdl.handle.net/1834/1884
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Estudio de impacto ambiental en Punta Fort William, verano austral: 1995-1996, 1997-1998 OceanDocs
Valencia T., M..
Durante los veranos australes de 1995-1996 y 1997-1998 se llevó a cabo, en Ensenada Guayaquil, cuerpo de agua aledaño a Punta Fort William, Isla Greenwich, del archipiélago de las Shetland del Sur, lugar del asentamiento de la Estación Científica "Pedro Vicente Maldonado", estudios químicos de la calidad de las aguas tendientes a determinar el eventual impacto que las actividades humanas pudieran ocasionar sobre tal ecosistema. Se presenta información acerca de las condiciones de oxigenación de las aguas, temperatura y salinidad de las mismas, la capacidad nutricia en relación con la concentración de micronutrientes inorgánicos así como información acerca de la presencia de hidrocarburos del petróleo disueltos y dispersos y, para establecer la efectividad...
Tipo: Journal Contribution Palavras-chave: Environmental impact; Water quality; Hydrocarbons; Waste water; Dissolved oxygen; Chemical analysis; Environmental impact; Water quality; Waste water; Dissolved oxygen; Hydrocarbons; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_24927; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_3719.
Ano: 1998 URL: http://hdl.handle.net/1834/3850
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Calidad ambiental de la zona costera del Golfo de Batabanó, Cuba OceanDocs
Martínez Canals, M.; Montalvo, J.F.; Miravet, M.E.; Lugioyo, M.; Loza, S.; Pérez, R.; García, I.; Rodríguez, A.; Cesar, M.E.; Esponda, S.; Sánchez, M.; Delgado, V..
The anthropogenic affectation was evaluated on the coast N of the Gulf of Batabanó in May 2003 (corresponding to the provinces of Matanzas and Havana), in areas located in the line of the coast. The results were compared with the historical information of the sector. In the coast N and the Ensenada of the Broa, the parameters oxygen saturation, DBO5 and DQO showed characteristic high values of eutrofication. The biggest contribution in the Cianoficies was in the near coastal areas to sources of organic contamination. In the case of the nutrients they show specific data of mesothrofic waters with tendency to the eutrofization and the silts presented a high affectation for toxic metals. The area near to Guanímar is distinguished to present conditions of...
Tipo: Proceedings Paper Palavras-chave: Phytoplankton; Water quality; Primary production; Chemistry; Environmental monitoring; Phytoplankton; Water quality; Primary production; Chemistry; Environmental monitoring; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_1522; Http://aims.fao.org/aos/agrovoc/c_37876.
Ano: 2006 URL: http://hdl.handle.net/1834/2172
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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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Essai d’évaluation de la qualite des eaux de ruissellement du bassin versant de la lagune de Bizerte OceanDocs
Hammami, J.; Brahim, M.; Gueddari, M..
La lagune de Bizerte, située en Tunisie nord-orientale, constitue un bassin récepteur d’un réseau hydrographique bien développé. Afin d’apprécier l’impact des facteurs naturels et anthropiques sur les eaux de ruissellement du bassin versant de cette lagune, une campagne de prélèvement d’eau a été effectuée en février 2003 (période de crue) au niveau de la partie aval de quinze cours d’eau, à raison d’un échantillon par cours d’eau. Les échantillons d’eau prélevés ont fait l’objet de mesure in situ des variables physico-chimiques (température, pH et O2 dissous) et d’analyses au laboratoire de la chlorophylle a et des différentes formes organiques et inorganiques dissoutes de l’azote et du phosphore. Les résultats obtenus ont montré que les eaux de...
Tipo: Journal Contribution Palavras-chave: Anthropogenic factors; Chemical properties; Chlorophylls; Nitrogen; Phosphorus; Physical properties; Pollution monitoring; Runoff; Water quality; Chemical properties; Nitrogen; Phosphorus; Runoff; Water quality; Chlorophylls; Anthropogenic factors; Physical properties; Http://aims.fao.org/aos/agrovoc/c_9754; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_35388; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_13328.
Ano: 2005 URL: http://hdl.handle.net/1834/3747
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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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Etat environnemental de la lagune de Boughrara et ses alentours deux ans après les travaux d'aménagement et d'élargissement du pont d'el Kantara OceanDocs
Ghuetat, F.; Sellem, F.; Akrout, F.; Brahim, M.; Atoui, A.; Ben Romdhane, M.S.; Daly, Yahia, M. N..
L’étude de l’état environnemental de la lagune de Boughrara a été réalisée deux ans après la mise en service du nouveau pont El Kantara. Les paramètres étudiés dans l’eau (nitrites, nitrates, ammonium, azote, phosphore total, chlorophylle a) et le sédiment (matière organique, faciès sédimentaire) ont été analysés dans trois zones de la lagune appartenants à divers contextes géographiques et environnementaux. Les résultats obtenus ont montré d’évidents signes d’amélioration des conditions générales de cet écosystème. Les distributions spatiotemporelles et saisonnières des paramètres étudiés indiquent que les teneurs trouvées atteignent le seuil d’eutrophisation pas mal de fois mais restent toujours inférieurs à ceux mentionnés par la DGPA en 2000 avant les...
Tipo: Journal Contribution Palavras-chave: Water quality; Coastal lagoons; Sediments; Abiotic factors; Coastal lagoons; Environmental assessment.
Ano: 2012 URL: http://hdl.handle.net/1834/5316
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Calidad ambiental del bloom algal en área urbana del Estero Salado (Ciudad de Guayaquil) en junio 2005 OceanDocs
Torres, G.; Palacios, C..
Este artículo tiene como objetivo caracterizar la calidad ambiental físico-química de la marea roja en el Estero Salado en junio del 2005.
Tipo: Journal Contribution Palavras-chave: Algal blooms; Red tides; Algae; Environmental monitoring; Water quality; Marshes; Environmental monitoring; Water quality; Algal blooms; Algae; Marshes; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_32367; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_4631.
Ano: 2007 URL: http://hdl.handle.net/1834/2363
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A review of water quality and pollution studies in Tanzania OceanDocs
Mohammed, S.M..
Institute of Marine Sciences Zanzibar
Tipo: Journal Contribution Palavras-chave: Water quality; Water pollution.
Ano: 2002 URL: http://hdl.handle.net/1834/741
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Capacité des moules dans la réduction des teneurs en nutriments et la charge bactérienne dans les effluents piscicoles OceanDocs
Chebil Ajjabi, L.; Romdhane, M.S.; El Abed, A..
L’effluent des élevages de poissons renferme des concentrations plus élevées en nutriments dissous et en particules en suspension que celles présentes dans l’eau entrante. Cet état entraine par conséquent, des problèmes d’ordre environnementaux affectant les eaux côtières dues à l’eutrophisation et l’augmentation de la turbidité. Afin d’améliorer la qualité de l’effluent avant son déversement dans le milieu naturel, l’utilisation des bivalves comme filtre biologique est une alternative adéquate. Cette étude analyse la capacité de la moule Mytilus galloprovincialis de réduire les teneurs en sels nutritifs et la charge bactérienne dans les effluents de loups Dicentrarchus labrax en élevage. L’effluent issu des bassins de grossissement est pompé directement...
Tipo: Journal Contribution Palavras-chave: Aquaculture effluents; Bacteria; Biofilters; Chlorophylls; Chlorophylls; Culture effects; Density; Effluents; Filtration; Fish; Mussel culture; Nitrogen; Nutrients (mineral); Phosphorus; Suspended particulate matter; Wastewater recycling; Wastewater treatment; Water quality; Fish; Nitrogen; Phosphorus; Water quality; Mussels; Nutrients; Bacteria; Chlorophylls; Density; Effluents; Filtration; Wastewater treatment.
Ano: 2008 URL: http://hdl.handle.net/1834/3756
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Qualité bactériologique des eaux de surface de la rivière Banco, Abidjan, Côte d'Ivoire. OceanDocs
Adingra, A.A.; Sako, A.; Kouassi, A.M..
Les eaux de surface de la rivière Banco contiennent de fortes densités de bactéries témoins de contamination fécale et de germes mésophiles. L'origine de cette pollution est beaucoup plus humaine; ce qui constitue un danger potentiel les principaux utilisateurs. Compte tenu des multiples utilisations de la rivière Banco, il est important pour les autorités locales d'entreprendre des campagnes de sensibilisation auprès de tous les utilisateurs.
Tipo: Journal Contribution Palavras-chave: Water quality; Surface water.
Ano: 2010 URL: http://hdl.handle.net/1834/5774
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Methods for assessing the impacts of natural resource management research Open Agri
B..
Palavras-chave: Watersheds; Soil degradation; Watershed management; Assets; Policies; Land resources; Water quality; Economics; Water harvesting; Investment.
Ano: 2003 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4231
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Rapport: de kwaliteit van de Schelde 1994 OMA
Tipo: Info:eu-repo/semantics/book Palavras-chave: Water quality.
Ano: 1997 URL: http://www.vliz.be/imisdocs/publications/128413.pdf
Registros recuperados: 343
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