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| Registros recuperados: 132 | |
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| Chalén, F.. |
| Los hidrocarburos fueron investigados en el área costera del Litoral Ecuatoriano bajo el proyecto ODEPLAN del INP. La información evaluada corresponde al mes de octubre del 2003. Se programaron un total de 42 sitios para el muestreo de sedimentos de fondo, los cuales fueron demarcados con un GPS (Global Positional System). Las muestras de sedimentos fueron colectadas utilizando draga Van Veen, las mismas que fueron analizadas de acuerdo a la metodología señalada por UNIESCO/COI/PNUMA y leídas por Espectrofluometría. La zona mayormente monitoreada fue la Subárea A correspondiente al estuario externo del Golfo de Guayaquil, la misma que no se encontró significativamente contaminada, seguida de las Subáreas B y C, puesto que la mayoría de las concentraciones... |
| Tipo: Journal Contribution |
Palavras-chave: Hydrocarbons; Sediments; Organic compounds; Pollution; Hydrocarbon analysis. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/5373 |
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| Shaghude, Y.W.. |
| The shore morphology and nearshore sediments between the Pangani and Kipumbwi rivers were investigated to describe the shore and the reef platform sediments characteristics and also to update information on recent shoreline changes along the Tanzania mainland coast. The information gathered during this study comes from field observations, sediment sampling of the area and interviews with Pangani residents. The investigated area is a patch reef coast with narrow or no beaches and fossil reef terrace islands offshore, Pangani bay and estuary are among the most prominent shore features. Historical information indicates that, both the bay, and the estuary have undergone significant changes during the last 60 years. While the growth of the estuary has mainly... |
| Tipo: Preprint |
Palavras-chave: Sedimentation; Coastal sediment; Sediments; Reefs; Shorelines; Sediment sampling. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/214 |
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| Brahim., M.; Atoui, A.. |
| Les analyses granulométriques des sédiments superficiels de la zone côtière située entre Ras Taguermess et Ras Marmours montrent que les petits fonds (-2 à -10 m) sont couverts par des sables fins aux sables grossiers (la moyenne est entre 0,39 et 3,34 ), généralement mal à très mal classés. Cependant, le haut de plage situé entre Ras Taguermess et Ras Marmour est couvert essentiellement par des sables fins et des sables moyens (la moyenne est entre 1,082 et 2,823 ). La répartition spatiale des sables ne montre pas un grano-classement décroissant ou croissant des sédiments de la côte vers le large. Cette distribution est due à l‘existence d’une énergie importante où la houle joue le rôle essentiel sur leur répartition. L’étude granulométrique montre aussi... |
| Tipo: Journal Contribution |
Palavras-chave: Beaches; Coastal zone; Grading; Longshore sediment transport; Sediment analysis; Sediment texture; Sediments; Swell. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4445 |
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| 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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| Gualancañay, E.. |
| Para este trabajo se analizaron un total de 17 muestras de sedimento para el estudio de los foraminíferos, se identificaron 10 especies de foraminíferos planctónicos y 8 especies de f. bentónicos. Las muestras fueron colectadas durante la expedición científica "GEOMETEP III", simultáneamente por el R/V "SONNE", de la República Federal Alemana y por el BAE "ORION", del Instituto Oceanográfico de la Armada del Ecuador, entre el 19 de Enero y el 16 de Febrero de 1983, en el rift de Galápagos, para un estudio de prospección en el área del 85/ 86°W, para iniciar un reconocimiento en la transecta de los 85° 30'W. |
| Tipo: Journal Contribution |
Palavras-chave: Foraminifera; Sediments. |
| Ano: 1986 |
URL: http://hdl.handle.net/1834/2107 |
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| Soledispa, B.. |
| En este trabajo se presentan los resultados de las investigaciones realizadas sobre sedimentos superficiales de fondo, desde el punto de vista granulométrico. Un total de 28 muestras de sedimentos del área entre la Puntilla de Santa Elena y Punta Blanca (Provincia de Santa Elena, Ecuador), fueron analizadas, de cuyo resultado se determinó una predominancia de arena media a fina, mal seleccionada, aunque también hay bien seleccionadas; son asimétricamente negativas. Los acantilados del sector están conformados por rocas sedimentarias, muy inestables, por eso son de fácil erosión. Centros turísticos y poblacionales se han instalado a lo largo de la línea de costa. |
| Tipo: Journal Contribution |
Palavras-chave: Sediments; Geomorphology; Granulometry; Geomorphology; Http://aims.fao.org/aos/agrovoc/c_3233. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3370 |
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| Van Alsenoy, V.; Bernard, P.; Van Grieken, R.. |
| The elemental composition of sediment and suspended matter samples from the Belgian coastal and offshore regions of the Southern Bight of the North Sea and from the Scheldt estuary has been determined using X-ray fluorescence and atomic absorption spectrometry.Special attention was given to the heavy metals of the black and grey lists. The bulk sediment and the clay/silt fraction were analyzed. The average heavy metal contents in the fraction <63 µm were comparable to the levels in the suspended matter. Different normalization techniques led to the identification of two different populations of sediments. Most of the sediments were enriched in Cd, Cr, Hg, Pb and Zn but no enrichment was found for Cu and Ni. Comparing these data with older data indicates... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Pollution; Sediments; Suspended particulate matter. |
| Ano: 1993 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2789 |
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| Gyedu-Ababio, T.; Furstenberg, J.P.; Baird, D.J.; Vanreusel, A.. |
| Nematodes from the sediments of the Swartkops estuary in Port Elizabeth, South Africa were investigated at 10 selected sites along a salinity gradient in the subtidal region at neap tide. The relation between nematode density, genera, community structure and environmental parameters including concentrations of seven heavy metals, Mn, Ti, Cr, Pb, Fe, Sn and Zn in the sediment were investigated. The nematode community structure was significantly influenced by the chlorophyll a concentration and sediment particle-size distribution. The number of genera had significant negative correlation with chlorophyll a and two heavy metals, Fe and Zn in the sediment. The habitat preferences of the genera were also assessed. A combination of the Shannon-Wiener Diversity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Check lists; Density; Diversity; Ecology; Meiobenthos; Pollution; Sediment; Sediments; Nematoda [Nematodes]. |
| Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7328 |
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| DÍAZ-JARAMILLO,MAURICIO; MUÑOZ,PAMELA; DELGADO-BLAS,VÍCTOR; BERTRÁN,CARLOS. |
| This study is based on the identification and distribution of spionid polychaetes in relation to abiotic characteristics of the environment at the mouth of the Valdivia-Tornagaleones estuary in south-central Chile. Four samplings were carried out in 2005, in which eight species were identified including Aquilaspio peruana, Boccardia polybranchia, Carazziella carrascoi, Dipolydora socialis, Minuspio patagónica, Rhynchospio glutaea, Scolelepis quinquedentata and Spiophanes sp. As it is typical of other estuaries in south central Chile, spionids were an important component of the macroinfauna of the Valdivia estuary. The distribution of the Spionidae family in the system showed higher species richness in the outer reach of the estuary but higher abundance... |
| Tipo: Journal article |
Palavras-chave: Polychaeta; Spionidae; Distribution; Estuary; Salinity; Sediments; Chile. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400005 |
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| Merlo,Carolina; Abril,Adriana. |
| BACKGROUND: We analyzed the following characteristics of water self-depuration capacity along a polluted river (Suquía River) in Argentina: (a) abundance of microbial metabolic groups, (b) cover and type of vegetation, and (c) type and concentration of soil and sediment humic substances. The objective was to establish the modifications of water self-depuration characteristics of the polluted sites in comparison to a reference site in order to provide basic data for ecological restoration programs. Five samples of riparian soil, water, and sediments were collected at a reference site and five polluted sites during low- and high-flow water periods. In each site the vegetation type and soil cover were recorded. In all samples the abundance of ammonifiers,... |
| Tipo: Journal article |
Palavras-chave: Humic substances; Microbial groups; Sediments; Sulfate reducer; Vegetation type. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100011 |
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| DORADOR,CRISTINA; CASTILLO,GABRIELA; WITZEL,K. P.; VILA,IRMA. |
| Rapel reservoir is an eutrophic system in Chile that has undergone a series of anthropogenic impacts in recent decades. To provide a better understanding of the processes occurring in the reservoir, we examined bacterial composition from surface sediments using traditional microbiology techniques and molecular biology tools. Our results showed significant temporal variation in the physical and chemical composition of the water column, but no depth-related differences during the study period. To detect temporal changes in bacterial composition, cultivable heterotrophic bacteria, heterotrophic iron oxidizing bacteria, and sulfate-reducing bacteria were extracted from the surface sediments and their concentration measured. Microbial diversity in sediments was... |
| Tipo: Journal article |
Palavras-chave: Sediments; Sulfate-reducing bacteria; 16S rDNA. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000200007 |
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| TAPIA,RAÚL; LANGE,CARINA B; MARCHANT,MARGARITA. |
| This study examines onshore-offshore and vertical distribution of living (Rose Bengal stained) benthic foraminifera (> 180 μm fraction) from three sediment stations along a bathymetric transect off Concepción, Chile (station 18 = 88 m water depth, station 26 = 120 m, station 40 = 1,030 m), within and below the oxygen minimum zone. All cores were collected in austral winter. Calcareous foraminifera dominated the three stations. The species composition, living foraminifera density, and vertical distribution patterns within the sediment changed in accordance with bottom water dissolved oxygen concentration and food availability. Onshore-offshore pattern revealed overall highest living foraminiferal densities at shelf stations 18 and 26 where... |
| Tipo: Journal article |
Palavras-chave: Benthic foraminifera; Sediments; Oxygen minimum zone; Concepción; Chile. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300009 |
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| Registros recuperados: 132 | |
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