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| Registros recuperados: 364 | |
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| Blivi, A.B.. |
| Le littoral étudié est situé sur la frange méridionale de la côte ouest-africaine, localisé dans le golfe du Bénin enire le cap des Trois Pointes et la façade ouest du delta du Niger. 11 s'étend sur 500 km de long et mesure 1 à 25 km de largeur. L!étude porte sur la géomorphologie, l'évolution et la morphodynamiqiue actuelle de deux ensembles distincts: un littoral formé de delta lagunaire, peu complexe avec un front deltaïque caractérisé par une série de flèches sableuses accolées; de cordons associés a un système lagunaire et un littoral ocheux marqué par des falaises taillées dans les roches cristallines et sédimentaires et entrecoupé par des estuaires à lagunes, des baies abritées où se développe une végétation de palétuviers. Le relief est raccordé à... |
| Tipo: Theses and Dissertations |
Palavras-chave: Geomorphology; Geology; Geology; Geomorphology; Http://aims.fao.org/aos/agrovoc/c_3232; Http://aims.fao.org/aos/agrovoc/c_3233. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/2702 |
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| Alvarez Alemán, A. |
| Se estudió la población del manatí antillano (Trichechus manatus) presente en la Ensenada de la Siguanea. Se colectó información acerca de los avistamientos de la especie, tamaño de los grupos, conductas, composición de la dieta y amenazas potenciales. Además se realizó la caracterización de sushábitats principales. Se utilizaron diversas metodologías que incluyeron muestreos en botes, a partir de recorridos y desde estaciones fijas, colecta e identificación de especies vegetales, colecta y análisis de material fecal y entrevistas a pescadores. Se determinó que la zona de estudio presenta un conjunto de características adecuadas para la supervivencia de la especie, como disponibilidad de alimento, temperatura del agua apropiada, fuentes de agua dulce,... |
| Tipo: Theses and Dissertations |
Palavras-chave: Habitat selection; Conservation; Aquaculture. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/5697 |
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| Bécquer Zuñiga, U.. |
| En Cuba el cultivo de camarÿn marino Litopenaeus schmitti ha sido una actividad priorizada por el Estado, por la cantidad de empleos que genera y los ingresos obtenidos por la comercializaciÿn del producto final. Trabajos previos indican el conocimiento de la estructura genþtica de las poblaciones de esta especie empleando marcadores moleculares, existen estudios sobre reproducciÿn y nutriciÿn. Finalmente, el cierre del ciclo de cultivo en cautiverio sumado a la experiencia de casi dos dþcadas en esta actividad promueven la necesidad de comenzar el mejoramiento genþtico de L. schmitti por crýas selectivas en el paýs. En este trabajo se describe una metodologýa para la formaciÿn de grupos genþticos por... |
| Tipo: Theses and Dissertations |
Palavras-chave: Shrimp culture; Genetic selection; Population genetics. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/5399 |
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| Ahmed, Mohammed Elamin Bashir Hassan. |
| Although the understanding of the oceanography of the Red Sea has been developed over the last few decades, but we still have a little knowledge about the influences of the physical factors on the phytoplankton activity. The purpose of the present study was initially to quantify and investigate the seasonal variation of surface chlorophyll concentration (CHL-a) at three zones in the Red Sea (north, middle and south). The second goal is to identify the controlling factors which seem to have an effect on the phytoplankton bloom during the same period of the study. To reach our goals, we use remote sensing data (surface chlorophyll, sea surface temperature and photosynthetically available radiation), oceanographic data (wind speed), and modeling data (mixed... |
| Tipo: Theses and Dissertations |
Palavras-chave: Chlorophylls. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/5083 |
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| Medhioub, Walid. |
| Cette étude à pour objectif de maîtriser les conditions de culture et de production toxinique chez Karenia selliformis et Alexandrium ostenfeldii dans le but de réaliser des contaminations expérimentales indépendamment du caractère aléatoire des proliférations toxiques en zones côtières. Ce travail vise également à étudier l‘impact de l‘alimentation sur la détoxification artificielle de la pa lourde Ruditapes decussatus contaminée par des gymnodimines et de l‘huître Crassostrea gigas contaminées par des spirolides et enfin d‘étudier l‘impact physiologique de ces micro-algues toxiques au niveau des organes accumulateurs des coquillages. Dans un premier temps, il a été mis en évidence que les performances de croissance de K. selliformis (taux de croissance... |
| Tipo: Theses and Dissertations |
Palavras-chave: DETOXICATION; Gymnodimine; Spirolide; Culture; Karenia selliformis; Alexandrium ostenfeldii; Ruditapes decussatus; Histology; Crassostrea gigas. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4773 |
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| Uaissone, A.J.R.. |
| The work refers to variations of the mean sea level (MSL) in Piraquara (RJ) due to mesoscale atmospheric disturbances in the South and Southeast Brazil oceanic area. The sea level data were submitted to a verification and consistence process, and then they were validated with the help of predicted levels by the software Pacmaré (FRANCO, 1992). For the pressure and wind velocities, the NCEP re-analysis data was used. Thompson's low pass optimizable filter was used to remove high frequencies in the data. Differently to the habitual use of quarters of year in climatologic studies, in this work partitions of the year centered in solstice and equinox were considered. About the results of the statistical analysis in the time domain, it was seen that MSL... |
| Tipo: Theses and Dissertations |
Palavras-chave: Sea level; Atmospheric disturbances; Dynamics. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/910 |
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| Ali, Aasim. |
| Red Sea water samples were collected from the Sudanese coast at depths of 10 meter during June 2011 and analyzed for major and trace metals in addition to some inorganic anions. Sodium Na, potassium K, strontium Sr, magnesium Mg, calcium Ca, sulfur S, iron Fe, zinc Zn, manganese Mn, nickel Ni, copper Cu, cadmium Cd, cobalt Co, lead Pb, arsenic As, barium Ba, chromium Cr, europium Eu, lanthanum La, silicon Si, and titanium Ti were analyzed using inductively coupled plasma optical emission spectroscopy (ICP-OES) to determine their existing concentration, their distribution patterns, study the level of contamination in the Red Sea Sudanese coastal water, and the data of the analysis was used in the preparation of the Red Sea arti cial water which was used in... |
| Tipo: Theses and Dissertations |
Palavras-chave: Trace metals. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4555 |
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| OSMAN ADAM ALI, ABDU ELAZEEM. |
| The analysis of geology and structure of the study area (East Nile - North Khartoum) is attempted by utilizing regional gravity and vertical electrical sounding (VES) data to investigate the source of the high gravity encountered over the basin features in this area as well as to reveal the structures, sedimentary sequences and groundwater condition in the area. The regional gravity measurements are achieved along two profiles in the area using Scintrex CG-3 gravimeter. All corrections common in gravity method are applied to the field data to produce Bouguer anomalies. The Bouguer anomalies are combined together with those produced by Sun Oil Company in 1984 and the residual anomaly separation is made using the least-squares method. The residual anomalies... |
| Tipo: Theses and Dissertations |
Palavras-chave: Ground water. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/5080 |
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| Torres, G.M.. |
| Las playas arenosas son ambientes rigurosos donde los patrones comunitarios de macrofauna han sido relacionados con el tamaño de grano de arena, pendiente de la playa y procesos de ola/swash. Las relaciones entre la abundancia/diversidad de la macrofauna y morfodinámica de las playas micromareales de alta energía abiertas al mar dan pie a pensar un incremento de la abundancia/densidad desde playas con arena gruesa y fuerte pendiente hasta playas planas con arena fina y pendiente suave. Sin embargo, estas predicciones no han sido adecuadamente evaluadas cuando se trata de playas de baja energía protegidas, a pesar de que este tipo de playas es frecuente en la costa. En este trabajo se evalúan las características y variaciones de la taxocenosis de... |
| Tipo: Theses and Dissertations |
Palavras-chave: Ecology; Conservation; Marine crustaceans; Ecology; Http://aims.fao.org/aos/agrovoc/c_2467. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/3646 |
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| Vallarino, E.A.. |
| El mitílido Brachidontes rodriguezii es el organismo estructurante de una compleja comunidad intermareal que se desarrolla sobre los sustratos intermareales duros (cuarcíticos y limo- loessoides), en el sudeste de la provincia de Buenos Aires (Argentina). El presente estudio se desarrolló durante los años 1997, 1998, 1999 y 2000, en áreas costeras de los alrededores de Mar del Plata (Camet); Santa Clara del Mar (Santa Elena) y en Mar de Cobo. Se determinaron cuatro estaciones de muestreo en la zona de Camet (área impactada) y dos áreas control en Santa Elena y Mar de Cobo. En cada muestreo se tomaron muestras biológicas, de sedimento retenido y de Materia orgánica, así como de las variables ambientales: temperatura, salinidad, oxígeno disuelto, turbidez y... |
| Tipo: Theses and Dissertations |
Palavras-chave: Intertidal environment; Biological sampling; Environmental factors; Pollution effects; Spatial variations; Seasonal variations; Biomass; Intertidal environment; Environmental factors; Biomass. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/2955 |
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| Ole-MoiYoi, L.K.. |
| For countless centuries, fishing-dependent indigenous communities have protected their marine environments from over-exploitation. Understanding that proper conservation guaranteed food for future generations, many of these communities fished only during certain times of the year, or divided up fishing grounds based on familial ties. However, as these communities lost water rights following the formation of certain nation-states, and international fishing fleets moved into the world’s oceans, a need arose to devise new techniques for protecting marine environments. Not only is this protection necessary to maintain biodiversity, but also to guarantee food security and the cultural traditions of fishing villages around the world. In 1957, British biologists... |
| Tipo: Theses and Dissertations |
Palavras-chave: Protected areas; Marine parks; Local communities; Http://aims.fao.org/aos/agrovoc/c_9000107. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/369 |
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| Registros recuperados: 364 | |
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