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4367?size=60x60 Ve William Senior

Workflow Phytobenthos and macrophytes of the Manzan... (1)

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A phytobenthos and macrophytes checklist was carried at the Manzanaresriver basin, Sucre state, Venezuela, from November 2003 to July 2005. Collectwas accomplished manually and material was examined with a stereoscopicloupe and a microscope. With artificial key aid, 21 phytobenthos andmacrophytes species: 4 Cyanophyta, 9 Chlorophyta, 1 Heterokontophyta, 2Rhodophyta, 3 Bryophyta and 2 Magnoliophyta were identified. The basin lowersof the Manzanares presented the higher species number, being th...

Created: 2016-03-19

Credits: User William Senior

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4367?size=60x60 Ve William Senior

Workflow NIVELES DE METALES PESADOS EN SEDIMENTOS S... (1)

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To evaluate the water quality along the continental shoresof Venezuela, where fishing communities exploit the clam Tivelamactroides, the concentration of heavy metals (Cu, Mn, Fe, Zn,Cd, Ni, Pb y Cr) was determined in superficial sediments,together with environmental factors (temperature, salinity,dissolved O2, pH, phytoplanctonic biomass, seston, and total Nand P) of the litoral waters of Playa Güiria on the northeasterncoast (Sucre State), and of Río Chico and Boca de Paparo (Mi...

Created: 2016-03-19

Credits: User William Senior

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4367?size=60x60 Ve William Senior

Workflow MANUAL DE ANÁLISIS DE AGUA DE MAR (1)

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Se describen métodos para el análisis de agua de mar

Created: 2016-03-19

Credits: User William Senior

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4367?size=60x60 Ve William Senior
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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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4367?size=60x60 Ve William Senior

Workflow Growth of the tropical scallop, Euvola (Pe... (1)

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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...

Created: 2016-03-19

Credits: User William Senior

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4367?size=60x60 Ve William Senior

Workflow Influencia del rio Manzanares en la biodis... (1)

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The concentrations of heavy metals Co, Cr, Pb and Zn in the bioavailable fraction in surface sediments of marine-coastal region of the city of Cumana, Venezuela, were studied during periods of drought and rain, in 17 sampling stations located along the shoreline. Significant differences between the two periods of sampling were detected for chromium and lead concentrations, reaching the highest values during the rainy season. For the rest of the metals studied a similar behavior was found for ...

Created: 2016-03-19

Credits: User William Senior

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4367?size=60x60 Ve William Senior
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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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4367?size=60x60 Ve William Senior
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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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