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User: William Senior
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Blob Growth of the tropical scallop, Euvola (Pecten) zicz...

Created: 2016-11-25 16:26:20

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

We compared the growth of the scallop Euuolu (Pecten) ziczuc (L.) in three situations whichpotentially could be used for commercial culture, in cages maintained in suspension, in cages on thebottom and in cages partly buried in a sediment bottom. The latter permitted the scallops to burythemselves as in their natural habitat. Throughout the 7-month study, growth, as measured by shelllength and muscle mass, was by far superior for scallops in the partly buried cages. Possible explanationsfor t...

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Blob PRINCIPALES FUENTES DE CONTAMINACIÓN DEL RIO MANZANA...

Created: 2016-11-25 15:45:27

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

El río Manzanares es uno de los más importantes de Venezuela. Está ubicado en la región nor-oriental,en el Estado Sucre. Posee una cota máxima de 2.200,oo msnm, en el Cerro Las Peonias y una mínimade 00,oo msnm en el Golfo de Cariaco, con una longitud de cauce de 81 km, pendiente mínima de 15%y gasto medio de 1,23 m3/s. Existe una precipitación media anual de 1.328,10 mm, con evaporación de1.929,4 mm (MARNR, 1998). Según el...

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Blob Especiación de metales en sedimentos del río Cuchive...

Created: 2016-11-25 14:51:19

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The total concentration and the chemical forms of heavy metals were determined insuperficial sediments of the Cuchivero river, Venezuela, using sequential extraction andatomic absorption spectrophotometry with flame. Pollution indices were used to study thedistribution, pollution and environmental risk in the sediments. Total values ranged from,394-457 mgkg-1 Fe, 46,87-74,82 Mn, 6,45-11,92 Zn, 1,70-5,75 Ni, 0,39-3,7 Cu, 1,25-3,63Cr, 0,37-1,82 Co, 0,10-0,30 Cd y <Ld-0,20 mgkg-1 Pb. The meta...

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Blob Especiación del fósforo en sedimentos de un río trop...

Created: 2016-08-01 00:45:56

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

En este estudio, se empleó una modificación del método de extracciónsedimentaria (SEDEX) para cuantificar las diferentes formas de P en lossedimentos recolectados en río Cuchivero durante marzo del año 2014. El rango devariación de las concentraciones de las diferentes formas de P respecto al P total(PTf) fueron 4,84-7,49 gP/g para la fracción F1 constituida por el Pintercambiable (P-ad) más el asociado a óxidos de hierro (...

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Blob Studies of dissolved carbohydrates (or carbohydrate-...

Created: 2016-03-19 15:31:57

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

Variations in concentrations of dissolved sugars were studied along the salinity gradient of a smallestuary (Elorn, Bay of Brest, France) from February 1985 to January 1986. Total dissolved carbohydrate(TDCHO) and dissolved monosaccharides (MCHO) were measured by the methods of Burneyand Sieburth and Johnson and Sieburth respectively. It must be noted that these methods cannotdistinguish between carbohydrates and carbohydrate-like substances; consequently, these methodsprobably do not closely...

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Blob HISTORICAL RECONSTRUCTION OF HEAVY METAL CONCENTRATI...

Created: 2016-03-19 13:30:41

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

210-Pb activity is an useful technique in environmental investigation, todetermine sediments accumulation rates, geochronology, and to study metals.Its activity decline exponentially with depth, and is inversely proportional to thesedimentation rate at non-impacted ecosystem. Dating of sediments, combinedwith chemical profile, allow the study of the impact events in coastal zones.In the present study, we have investigated the history of metals concentrationsand sedimentation rates of recent s...

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Blob SECTOR ORIENTAL DEL GOLFO DE CARIACO, VENEZUELA. UNA...

Created: 2016-03-19 13:25:58

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The hydrochemical, physical-chemical, and biological dynamics were studied in the eastern waters of the gulf ofCariaco, where wind and precipitation patterns govern these processes to a significant degree. Average monthly values forboth surface and bottom waters were respectively as follows: temperature: 25.69 °C each; salinity: 35.41 and 35.75 units;density anomaly (ó-t): 23.43 and 23.84 kg/m3; oxygen concentration: 184.49 and 178.38 mmol/kg; pH: 7.98 and 7.94;nitrates: 3.18 and 4...

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Blob Evaluación de la distribución del contenido total y ...

Created: 2016-03-19 01:05:32

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

En el presente trabajo se analizó la concentración de Cu, Cd, Pb y Hg en lossedimentos superficiales del estero Santa Rosa, Provincia de El Oro, Ecuador.Las concentraciones de estos elementos fueron muy elevadas para la mayoría delas muestras analizadas en todos los puntos de muestreo seleccionados. Sudistribución no fue homogénea, ni presentó un patrón geográfico marcadamentedefinido, pudiéndose encontrar altos niveles distribuid...

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Blob CUANTIFICACIÓN DE LAS CONCENTRACIONES DE METALES PES...

Created: 2016-03-19 00:31:17

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The content of Fe, Mn, Cu, Cr, Ni, Zn, Cd and Pb in muscle tissuesof fish and crustaceans from the Unare lagoon (Lagunade Unare) in the state of Anzoátegui, Venezuela, was analyzedby flame Atomic Absorption Spectrometry. The levels of thesemetals present in suspended material of the water and in sedimentswere also determined in order to detect possible impacton the ecosystem. The mean concentrations in the water werelow (0.104-0.53 μmol/L Fe; 0.004-0.06 μmol/L Mn; 0.002-0.028μ...

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Blob CARACTERIZACIÓN AMBIENTAL DE LA ENSENADA DE PLAYA GR...

Created: 2016-03-18 21:47:53

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The hydrographic conditions and sanitary quality of the waters of the coastal region of Playa Grande Baywere studied during May 2003. We set up 21 stations to collect surface and bottom samples and three current meters – anupward-mounted hydroacoustic profiler and two single-point Doppler current sensors that operated for 14 days. Samples werecollected in 5-L Niskin bottles equipped with a lid-closing device operated through a cable. The samples were studied accordingto established meth...

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