Search results for " Isotopic fractionation"

showing 3 items of 3 documents

Biogeochemical evaluation of historical sediment contamination in the Gulf of Palermo (NW Sicily): Analysis of pseudotrace elements and stable isotop…

2012

Abstract Sedimentary biogeochemical data from the Gulf of Palermo, which borders one of the major urban and industrial areas of the central Mediterranean, provide a decennial–centennial-scale record of the effects of human activity on this coastal environment. In this study we report trace elements (TE), C org /N tot ratios, δ 13 C org , and δ 15 N tot from dated ( 210 Pb) sediments collected in two coastal stations variably influenced by urban/fluvial loadings and illegal dumping and we compare them with published data for offshore sediments, in order to investigate at a large spatial scale the influence of on-land activities on sedimentary marine system. TE were generally low except for H…

chemistry.chemical_classificationMediterranean climateSediment pollution Isotopic fractionation Nitrogen isotope Carbon isotope Tyrrenian Sea PalermoSettore BIO/07 - EcologiaBiogeochemical cycleStable isotope ratioAquatic ScienceOceanographyOceanographychemistryIsotopes of carbonSedimentary organic matterSedimentary rockOrganic matterEutrophicationEcology Evolution Behavior and SystematicsGeology
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Isotopic composition of single rain events in the central Mediterranean

2008

[1] The ratios of stable isotopes of single rain events were investigated during the period October 2005 to September 2006 in the central Mediterranean. Clear seasonal trends were identified in both oxygen isotope ratios and the deuterium-excess parameter, and these were ascribed to the dominant circulation systems during both cold and hot intraannual periods. Rain events were classified on the basis of the origin of rain-bearing systems. Air masses coming from the south usually give rise to rainwater with a low deuterium excess. Air masses coming from the north and the northeast are often dry and cold, and are associated with high evaporation from the Mediterranean Sea that occurs under is…

Mediterranean climateAtmospheric ScienceEcologyIsotopeStable isotope ratioEvaporationIsotopic composition of rain- Isotopic fractionationPaleontologySoil ScienceForestryAquatic ScienceOceanographyIsotopes of oxygenSettore GEO/08 - Geochimica E VulcanologiaGeophysicsMediterranean seaSpace and Planetary ScienceGeochemistry and PetrologyClimatologyEarth and Planetary Sciences (miscellaneous)Kinetic fractionationEnvironmental sciencePrecipitationEarth-Surface ProcessesWater Science and TechnologyJournal of Geophysical Research
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Holothuria tubulosa Gmelin 1791 (Holothuroidea, Echinodermata) enhances organic matter recycling in Posidonia oceanica meadows

2014

Abstract The role of Holothuria tubulosa in organic matter recycling of Posidonia oceanica detritus was estimated in a laboratory feeding experiment. The individual mean ingestion rate of seagrass detritus by holothurians was evaluated and carbon and nitrogen stable isotopes, carbon and nitrogen content and C:N ratio analyzed in H. tubulosa , P. oceanica detritus and surface sediment. Results showed that H. tubulosa is capable of ingesting from 30% to 100% of the detritus produced by P. oceanica meadows, depending on the holothurian density. Stable isotope analysis provided evidence for the assimilation of seagrass detritus by H. tubulosa as their signatures were compatible with 1 trophic l…

chemistry.chemical_classificationTotal organic carbonSettore BIO/07 - EcologiabiologyHolothuria tubulosaAquatic Sciencebiology.organism_classificationSea cucumberSeagrasschemistryBenthic zonePosidonia oceanicaBotanyOrganic matterCarbon Ingestion rate Isotopic fractionation Nitrogen Seagrass detritus Sea cucumberEcology Evolution Behavior and SystematicsIsotope analysis
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