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Dissertations / Theses on the topic 'Isotope signature'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Pérez, Moreno Rodrigo. "Stable isotope and anthropogenic tracer signature of waters in an andean geothermal system." Tesis, Universidad de Chile, 2019. http://repositorio.uchile.cl/handle/2250/170853.

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Tesis para optar al grado de Magíster en Ciencias, Mención Geología<br>El presente trabajo se centra en el uso de isótopos estables y trazadores antropogénicos para investigar el origen, los tiempos de residencia y la evolución de las aguas termales en el Complejo Volcánico Lonquimay-Tolhuaca, ubicado en la parte central de la Zona Volcánica Sur. Veinte muestras de agua subterránea, surgiendo en un amplio rango de temperaturas (8-96°C), son analizadas para determinar su composición química, incluyendo elementos mayores, razones isotópicas (δ2H, δ18O, δ13CTDIC) y la concentración de clorofluoro

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2

Ferrio, Díaz Juan Pedro. "Reconstruction of climatic and crop conditions in the past based on the isotope signature of archaeobotanical remains." Doctoral thesis, Universitat de Lleida, 2005. http://hdl.handle.net/10803/8338.

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Reconstrucció de les condicions climàtiques i de conreu en el passat<br/>a partir de l'anàlisi isotòpica de restes arqueobotàniques<br/><br/>L'aparició i progressiu desenvolupament de l'agricultura durant els darrers 10.000 anys ha alterat radicalment<br/>l'estructura social i poblacional dels grups humans, així com la seva relació amb l'entorn. De fet, l'adopció de<br/>l'agricultura pot constituir el primer exemple en el temps d'interacció recíproca entre el medi ambient i la humanitat.<br/>Per tant, la reconstrucció de les condicions ambientals (d'origen climàtic o degudes a l'acció humana)

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3

Urlwin, Ben. "Carbon isotope stratigraphy of the late Proterozoic Wonoka formation of the Adelaide fold belt : diagenetic assessment and interpretation of isotopic signature and correlations with previously measured isotopic curves /." Title page, abstract and contents only, 1992. http://web4.library.adelaide.edu.au/theses/09SB/09sbu77.pdf.

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Thesis (B. Sc.(Hons.))--University of Adelaide, Dept. of Geology and Geophysics, 1993.<br>On title page : "National Grid reference : Copley 1:250,000 SH54-9 6636." Folded map in back cover pocket. Includes bibliographical references (leaves [50-65]).

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4

Geske, Anna-Christine [Verfasser], Adrian [Gutachter] Immenhauser, and Detlev K. [Gutachter] Richter. "Establishing the magnesium isotope signature of dolomites / Anna-Christine Geske ; Gutachter: Adrian Immenhauser, Detlev K. Richter ; Fakultät für Geowissenschaften." Bochum : Ruhr-Universität Bochum, 2014. http://d-nb.info/1212661877/34.

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5

Castleberry, Colette M. "Quantitative Identification of Non-coding RNAs by Isotope Labeling and LC-MS/MS." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258474676.

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6

Marryanna, Lion. "Effects of spatio-temporal distribution of soil moisture on a lowland dipterocarp forest at Pasoh Forest Reserve in Peninsular Malaysia." Kyoto University, 2018. http://hdl.handle.net/2433/232153.

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7

Abraham, Muriel. "Spatial variation in soil organic carbon and stable carbon isotope signature in a pasture and a primary forest in central Panamá." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80159.

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Soil properties and their spatial variability was measured to provide a strong database to assess the modification in soil properties associated with future changes in land use. Surface (0--10 cm) soil samples were collected from a 9 ha, 46-year-old pasture being converted to a native tree plantation and a neighboring control pasture near Sardinilla, Panama. A small-scale nested grid of surface soil samples was replicated in the future plantation and a primary forest in the region to evaluate the spatial variability of soil properties. Seven 1 m profiles were sampled in the future plant

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8

Romagnoli, Beatrice. "Influence of Guadalquivir estuary on aquatic biogeochemistry and isotopic signature of the saltmarshes of Doñana National Park (SW Spain)." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15062/.

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Doñana National Park (DNP) hosts one of the most important wetlands in Europe. In 1998, the release of a toxic sludge from storage ponds at a nearby mine, led to the construction of a dyke on the natural levee of the Guadalquivir river, to protect the vast Doñana marshland against the contaminated tailings. During almost two decades, hydrology in the marshes mostly depended on the rainfall regime and to a lesser extent on an underground aquifer. Over 2014, several actions were carried out to restore connectivity with the river, allowing the entry of estuarine waters. This work presents bio

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9

Upton, Sally A. "Novel use of a Natural Isotope Signature to Track Recruitment and Evaluate Age Determination Methods for the 2002 Year Class of American Shad in the York River." W&M ScholarWorks, 2008. https://scholarworks.wm.edu/etd/1539617876.

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10

Millet, Marc-Alban. "Interactions de faibles profondeurs et géochimie des basaltes d'îles océaniques : implications sur les modes d'acquisition de la signature isotopique et sur la topogique mantellique." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2007. http://tel.archives-ouvertes.fr/tel-00718419.

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Les compositions isotopiques de Sr, Nd et Pb des basaltes d'îles océaniques ont été mesurées de manière systématique depuis 30 ans. Les variations de ces compositions sont classiquement interprétées comme la signature du mélange entre des composants présents au sein des panaches mantelliques. Cependant elles peuvent aussi représenter des interactions entre les magmas et les réservoirs qu'ils traversent au cours de leurs remontées vers la surface. Après avoir mis en évidence les processus pouvant altérer la composition initiale d'un magma et proposer des moyens de s'en affranchir, 2 études loca

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11

Huckle, David Martyn. "Characterizing U-series Isotope Signatures in Soils and Headwater Streams in a Complex Volcanic Terrain: Jemez River Critical Zone Observatory, Valles Caldera, NM." Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/305863.

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Uranium-series isotopes are an emerging tool to characterize weathering and soil forming processes in the Critical Zone, the dynamic region of earth's surface where bedrock, water, soil, and life chemically and physically interact to support ecosystems. Understanding controls on the U-series composition of soils across a range of lithologies and climate is critical to applying existing mass balance models of U-series isotopes to calculate soil formation rates in these systems. This study seeks to understand the behavior of U-series isotopes in soil profiles in the semi-arid complex volcanic

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12

Beck, Kimberly D. "Investigation of the Lead Isotope Signatures of Marine Sediments in Relation to the Lead Isotope Signatures of Northern Andean Ores." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2201.

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Lead isotope ratios of ores and igneous rocks in the Central and Southern Andes show a large-scale geographic pattern related to magmatic source processes. This pattern changes in the Northern Andes for reasons that are not well understood; this study is an investigation of potential causes of this change. Deep ocean sediment samples from the Nazca Plate were analyzed for 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb, and the data were compared with published data on central Andean ores and ores and igneous rocks from Ecuador. Lead isotopic compositions of the Nazca Plate sediments are quite homoge

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SANTOS, Nielson Machado dos. "Os valores de referência, assinatura isotópica de fatores de enriquecimento de metais Pb e pesados em solos que cercam uma baía do ambiente impactado no Brasil." Universidade Federal Rural de Pernambuco, 2015. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5371.

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Submitted by (lucia.rodrigues@ufrpe.br) on 2016-08-17T12:29:29Z No. of bitstreams: 1 Nielson Machado dos Santos.pdf: 2159134 bytes, checksum: 0924bbce3bea148e3c14b840a9443026 (MD5)<br>Made available in DSpace on 2016-08-17T12:29:29Z (GMT). No. of bitstreams: 1 Nielson Machado dos Santos.pdf: 2159134 bytes, checksum: 0924bbce3bea148e3c14b840a9443026 (MD5) Previous issue date: 2015-07-06<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>This work was carried out to investigate the possible influence of human activities on heavy metal concentrations, by enrichment

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Ek, Caroline. "Towards understanding stable isotope signatures in stressed systems." Doctoral thesis, Stockholms universitet, Institutionen för miljövetenskap och analytisk kemi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-134967.

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Stable isotope analysis (SIA) is a valuable tool in ecotoxicology because δ13C and δ15N may provide insights into the trophic transfer of contaminants in a food web. The relationship between a species’ trophic position (TP, determined from δ15N) and internal concentration of biomagnifying contaminants can be established and used for regulatory purposes. However, the exposure of organisms to xenobiotics incurs physiological costs, and the stable isotope signature of a consumer reflects not only diet but also a physiological state. The latter raises questions regarding the interpretation of stab

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Conrad, Sarah. "Origin of Iron Isotope Signatures in Boreal Estuaries." Licentiate thesis, Luleå tekniska universitet, Geovetenskap och miljöteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17896.

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The geochemistry of iron (Fe) during freshwater transport and estuarine mixing has been investigated. Espescially the changes in the Fe-isotope signature have been studied. The fate of Fe-isotopes during estuarine mixing has been poorly studied. Sampling was performed in Kalix River, Kalix and Råne estuary, and in the open Bothnian Bay, Northern Baltic Sea. Water samples were filtered with 0.22 μm membrane filters. Both particulate (> 0.22 μm) and colloidal fractions (< 0.22 μm) were analyzed. Iron particles and colloids, with a negative Fe-isotope signature, are formed during spring flood in

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Weis, Franz. "Oxygen Isotope Signatures of the Apatite-Iron Oxide Ore at Grängesberg." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-173031.

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The origin of apatite iron oxide ores, like the deposit at Grängesberg in the Bergslagen mining district, has been a subject of much discussion through the years. Some support a formation by hydrothermal fluids while others suggest that the ore is orthomagmatic, i.e. formed directly from a magma as suggested for the iron ore deposits of El Laco in Chile or the deposits in Kiruna, although also these two are still subjected to controversies. In 2009 sampling was done on drillcores through the Grängesberg ore. On these samples an oxygen isotope study on magnetite, quartz and whole rock samples f

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Oschmann, Lynn A. "Global isotopic signatures of oceanic island basalts." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/25968.

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Lynch, Anthony H. "Carbon isotopic dietary signatures of amino acids." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:1399009e-e06e-4f85-ba47-0557d5018cde.

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In an exploratory study, techniques were developed for isolating bulk plant proteins and measuring the <sup>13</sup>C isotopic compositions of their constituent amino acids by HPLC-IRMS. Samples of plants expected to be of potential palaeodietary significance in northwestern Europe were selected for investigation. Different tissues of plants, leaves and seeds, may be distinguished from each other by the relative <sup>13</sup>C isotopic compositions (‘isotopic signatures’) of the amino acids of their constituent proteins. For each tissue type, different plant types may be distinguished in the s

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Day, Russell Davis. "Potentiel des banques d’échantillons environnementales pour les études biogéochimiques du Hg (spéciation et signatures isotopiques) dans les écosystèmes marins." Thesis, Pau, 2012. http://www.theses.fr/2012PAUU3026/document.

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Les échantillons archivés dans les banques d'échantillons de l’environnement (Environmental Specimen Banks en anglais, ESB) sont, parmi les échantillons disponibles pour effectuer des recherches sur l'environnement, les mieux caractérisés géographiquement et issues de longues séries chronologiques. Le mercure (Hg) est un métal lourd hautement toxique et très répandu qui reste l'un des contaminants majeur de l'environnement; les ESB ont joué un rôle de premier plan dans les recherches effectuées sur ce dernier. Ce travail de thèse résume et discute dans un premier temps les modes d’emplois clas

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Yamagata, Yuko. "Iron isotopic signatures for marine animals of various habitat." Kyoto University, 2019. http://hdl.handle.net/2433/242621.

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Denton, Tricia M. "Analyses of the relationship between stable isotope signatures, leaf epidermal morphology and the environment /." [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18307.pdf.

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22

Leroy-Dos, Santos Christophe. "Variabilité du cycle hydrologique atmosphérique en régions polaires à partir de mesures des isotopes stables de l'eau dans la vapeur, les précipitations et les carottes de névé." Electronic Thesis or Diss., université Paris-Saclay, 2021. http://www.theses.fr/2021UPASJ006.

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Dans un contexte de réchauffement climatique, appréhender l'évolution de la hausse du niveau des mers est un enjeu majeur. Pour cela un des éléments clefs est de comprendre l'évolution du cycle hydrologique atmosphérique dans les régions polaires qui influence directement le bilan de masse de surface des calottes Arctique et Antarctique (les deux plus gros réservoirs d'eau douce de la planète). Des enregistrements existent grâce aux données satellites depuis 50 ans et quelques rares données météo depuis 70 ans en Antarctique mais ces enregistrements sont trop courts pour étudier les modes de v

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Galeazzo, Tommaso. "Tracking volcanic sulphate : modelling tropospheric volcanic sulphate formation and its oxygen isotopic signatures." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS300.

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Les émissions volcaniques sont une source importante de soufre. Le soufre volcanique est oxydé et forme des aérosols sulfatés qui influencent le climat en absorbant et en dispersant le rayonnement solaire incident. Les émissions de soufre dans la troposphère influencent le climat local et régional, mais de grandes incertitudes subsistent en ce qui concerne l’oxydation et sa conversion en aérosols de sulfate volcanique. L’oxydation du soufre dans une vaste gamme de panaches volcaniques et l’influence des halogènes volcaniques sur la chimie du panache sont étudiées à l’aide d’un modèle de boîte

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Timmons, Jeffrey S. "Identifying the Isotopic Signature of Lake Effect Precipitation on the Northeast Ohio Isoscape." Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1609761585495598.

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Steele, Robert C. J. "Tracing signatures of discreet nucleosynthetic contributions to the early solar system using nickel isotopes." Thesis, University of Bristol, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556724.

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The Solar System is formed from material processed by a wide variety of nucleosynthetic sources (Burbidge et al., 1957). Many studies have investigated the nucleosynthetic origins of the Solar System by examining the isotopic anomalies within meteorites and their constituent components. However, debate continues as to the astrophysical source these anomalies represent and the early Solar System processes that results in their inhomogeneous distribution. Nickel isotopes offer an opportunity to examine further the sources and mixing of early Solar System materials. Nickel is an abundant element

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Shiel, Alyssa Erin. "An investigation of cadmium, zinc and lead isotope signatures and their use as tracers in the environment." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/27739.

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Environmental monitoring and remediation require techniques to identify the source and fate of metals emissions. In this study, Cd and Zn isotopes were evaluated as tools for the identification of metal sources through (1) the assessment of metallurgical processing as a source of Cd and Zn isotopic fractionation and (2) the measurement of isotopic compositions in bivalves from sites receiving variable metal contributions from natural and anthropogenic sources. This study was facilitated by the successful development of a technique to measure Cd and Zn isotopes (MC-ICP-MS) in environmental and

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Parkes, Stephen. "The isotopic signature of nitrous oxide emitted from agricultural soils measured by FTIR spectroscopy." School of Chemistry, Faculty of Science, 2008. http://ro.uow.edu.au/theses/129.

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Agriculture contributes 16% to Australia’s greenhouse gas emissions, of which 23% are the result of nitrous oxide (N2O) emissions. Global N2O emissions from agricultural activities have increased substantially since the beginning of the industrial revolution. This has been driven by the increase in the amount of nitrogen added to agricultural soils, stimulating the N2O-producing nitrification and denitrification processes. Currently there is a poor quantitative understanding of N2O emissions from nitrification and denitrification and their controlling parameters. This is difficult to quantify

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Zwank, Luc. "Assessment of the fate of organic groundwater contaminants using their isotopic signatures /." [Zürich], 2004. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=15378.

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Carramaschi, Guilherme Leite. "Isotopic signatures of Frenulata from cold seeps in the Gulf of Cadiz." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/7700.

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Mestrado de Biologia Marinha<br>Siboglinids are tube-dwelling annelids that are important members of deep-sea chemosynthetic communities, which include hydrothermal vents, cold seeps, whale-falls and reduced sediments. As adults, they lack a functional digestive system and rely on microbial endosymbionts for their energetic needs. Currently most researchers recognize four main lineages within Siboglinidae, Frenulata, Vestimentifera, Sclerolinum and Osedax, of which Frenulata is the most understudied. The discovery of chemosynthetic-based communities dominated by frenulates in several m

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Browning, Nicole. "Habitat Use and Feeding Ecology of Delphinids Inferred from Stable Isotopes and Fatty Acid Signatures." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5773.

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Prey availability, directly or indirectly, affects all aspects of a predator’s life history and is a primary factor influencing habitat selection and movements. This is especially true for delphinid species where it has been documented that the behaviors and movements of dolphins are strongly influenced by food availability. Unfortunately, the feeding ecology and habitat use patterns of many of these species are poorly understood. Many methodologies that have been employed to explore these facets of dolphin ecology have limitations and constraints or are logistically infeasible. Stable isoto

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Egal, Marion. "SIGNATURES CHIMIQUES DE L'ACTIVITE BACTERIENNE DANS LES EAUX ACIDES MINIERES." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2008. http://tel.archives-ouvertes.fr/tel-00455420.

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Les microorganismes extrêmophiles jouent un rôle déterminant dans le cycle du fer (oxydation et précipitation) dans les drainages miniers acides. Les phases minérales formées peuvent piéger efficacement des éléments toxiques tels que l'arsenic. L'objectif de ce travail est de mieux comprendre le rôle de l'activité bactérienne dans les processus d'atténuation naturelle des concentrations en Fe et As dans les DMA. Pour cela, différents marqueurs potentiels de l'activité bactérienne ont été étudiés (changement de spéciation, formation de biominéraux, fractionnement isotopique). L'approche de terr

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Egal, Marion. "Signatures chimiques de l'activité bactérienne dans les eaux acides minières." Montpellier 2, 2008. http://www.theses.fr/2008MON20157.

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Les microorganismes extrêmophiles jouent un rôle déterminant dans le cycle du fer (oxydation et précipitation) dans les drainages miniers acides. Les phases minérales formées peuvent piéger efficacement des éléments toxiques tels que l'arsenic. L'objectif de ce travail est de mieux comprendre le rôle de l'activité bactérienne dans les processus d'atténuation naturelle des concentrations en Fe et As dans les DMA. Pour cela, différents marqueurs potentiels de l'activité bactérienne ont été étudiés (changement de spéciation, formation de biominéraux, fractionnement isotopique). L'approche de terr

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Amor, Matthieu. "Signatures chimiques et isotopiques de la magnétite des bactéries magnétotactiques." Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCC103.

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Les bactéries magnétotactiques représentent l’unique cas identifié de biominéralisation contrôlée de la magnétite chez les procaryotes. Elles possèdent la capacité de former des nanoparticules de magnétite intracellulaires, de façon génétiquement contrôlée. Bien que ces bactéries soient ubiquistes dans les environnements actuels, il est très difficile d’identifieravec certitude leurs traces dans les formations géologiques anciennes. Leur identification permettrait de mieux contraindre l’évolution de la vie et des processus de biominéralisation au cours des temps géologiques. Dans cette étude,

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Meyers, Lisa A. "Investigations of Nuclear Forensic Signatures in Uranium Bearing Materials." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1380556939.

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Goulart, Rossana Vicente. "Caracterização geoquímica e isotópica das rochas carbonáticas da zona central do embasamento do Rio Grande do Sul." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/56322.

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O Bloco São Gabriel, localizado na zona central do embasamento cristalino do Rio Grande Sul, apresenta extensos registros do Neoproterozóico do Ciclo Brasiliano, contidos em complexos ígneos e metamórficos. Esses complexos também guardam registros sedimentares, com sequências carbonáticas metamorfisadas, cuja evolução tectônica é pouco conhecida. Essas sequências são observadas na Formação Passo Feio (Caçapava do Sul), no Complexo Cambaí (Vila Nova do Sul) e no Complexo Metavulcano-sedimentar Coxilha do Batovi (São Gabriel). As rochas carbonáticas da Formação Passo Feio compreendem dolomita má

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Hess, Emily Nancy. "Strontium, Lead, and Oxygen Isotopic Signatures of Mid-Miocene Silicic Volcanism in Eastern Oregon." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/2079.

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Widespread, mid-Miocene rhyolite volcanism of eastern Oregon that are coeval or slightly postdate flood basalts of the Columbia River Basalt Province allows for mapping crustal domains using radiogenic and stable isotopes. Rhyolites are thought to be derived in large part by partial melting of the crust and thus yield direct information on the composition of the crust. Silicic volcanism is expressed in the form of numerous domes and tuffs exposed over a wide area (~300 km in N-S dimension and ~200 km in E-W dimension) west of the presumed craton boundary, which runs parallel but mostly east of

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Smith, Jennifer Mae. "Geochemical signatures in the coral Montastraea modern and mid-Holocene perspectives /." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001593.

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Barnett, Beverly Kay. "Distinguishing red snapper, Lutjanus campechanus, nursery regions in the northern Gulf of Mexico with otolith elemental and stable isotope signatures." [Pensacola, Fla.] : University of West Florida, 2008. http://purl.fcla.edu/fcla/etd/WFE0000104.

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Allan, Elizabeth Louise. "Trophodynamics of the benthic and hyperbenthic communities inhabiting the Sub-Antarctic Prince Edward Islands : stable isotope and fatty acid signatures." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1006350.

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The aim of this study was to investigate spatial changes in the trophic and energy pathways of the benthic community in the shallow shelf waters of the sub-Antarctic Prince Edward Islands (PEI). A combination of stable isotope and fatty acid analyses were used to provide a time-integrated view of the assimilated feeding history of selected components of the PEI benthic community. This study forms part of the larger project entitled “Variability in the Southern Ocean ecosystems” and is a contribution to the South African National Antarctic Programme (SANAP). During austral autumn 2009, benthic

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Clark, Katherine Anne. "Tracing the evolution of organic balm use in Egyptian mummification via molecular and isotopic signatures." Thesis, University of Bristol, 2006. http://hdl.handle.net/1983/d8adf246-e23c-4bde-a6af-40851e75a37a.

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Harden, Judy Ann. "Light element and lithium isotope signatures of the emii reservoir - the society islands, french polynesia geochemical results and an educational application /." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001069.

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Williams, Sky Barrington. "Use of Stable Isotope and Trace Metal Signatures to Track the Emigration of Female Blue Crabs, Callinectes sapidus, from Tampa Bay." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4853.

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The blue crab, Callinectes sapidus, supports a successful fishery in the Atlantic Ocean and throughout the Gulf of Mexico, with a total landing of 8,158,788 lb. and a total value of $10,562,128 for the state of Florida during 2012 (FWC 2012 Annual Landings Summary). An accurate and comprehensive understanding of the blue crab's life history and seasonal migration behavior is essential in defining effective management strategies for the fishery. Tag recapture studies and ultrasonic tracking methods for studying blue crab migrations are costly in terms of time and resources. In this study an alt

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Odom, Jennifer Fletcher. "Fine-scale geographic variation of stable isotope and fatty acid signatures of three fish species in the Indian River Lagoon, FL." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5358.

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The Indian River Lagoon, Florida, is a unique closed “bar built” estuary system that has little interchange with the Atlantic Ocean and which is home to many resident species. Three fish species were investigated to see if their isotopic and fatty acid signatures differed based on geographic location. The goal was to assess the degree of resolution of spatial variation that is possible when using stable isotope and fatty acid signature analysis to interpret feeding habits and potential linkages between feeding habits and health status. Spotted seatrout (n=40), pinfish (n=60) and white mullet (

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Charon, Emeline. "Géochimie et nanostructures des carbones des achondrites primitives : recherche de signatures pré-accrétionnelles par SIMS, Raman et METHR." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-01059791.

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Cette thèse est focalisée sur la contribution de l'étude couplée de l'organisation multi-échelle et de la composition isotopique de C et N des carbones de météorites différenciées (acapulcoites - lodranites (A-L)), pour mieux comprendre l'histoire de leur corps-parent. Nous avons systématiquement combiné observations des carbones de ces météorites avec des analogues expérimentaux. Nous avons développé une méthodologie originale couplant l'étude de l'organisation des échelles micrométriques à nanométriques (par Microscopie Electronique par Transmission et Microspectrométrie Raman) et l'analyse

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Dalu, Tatenda, та Pierre William Froneman. "Can δ15N and δ13C stable isotopes and fatty acid signatures indicate changes in phytobenthos composition on an artificial substrate?" Taylor & Francis, 2014. http://hdl.handle.net/10962/68086.

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Publisher version<br>Temporal changes in fatty acid composition and δ15N, δ13C stable isotope values of the phytobenthos growing on artificial clay substrates under natural conditions over a 28-day period at an upstream and a downstream site in the Kowie River near Grahamstown were investigated in 2012. High concentrations of diatom markers 16:1ω7 and 20:5ω3 fatty acids were recorded, especially at the downstream site, reflecting the importance of diatoms in contributing to the phytobenthos communities at that station. After day 7 at the downstream site the average δ15N value of the phytobenth

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Holobinko, Anastasia. "STABLE ISOTOPE RATIOS AS A PROXY FOR HUMAN GEOGRAPHIC PROVENANCE: BIOGEOGRAPHICAL EVIDENCE FROM THE 2H, 18O, AND 13C SIGNATURES IN MODERN HUMAN TEETH." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/1108.

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The positive identification of a decedent is paramount to a forensic investigation in which human remains have been recovered and must be identified. Due to increasing global mobility in the world's populations, it is not inconceivable that an individual might die far away from his or her home. Pinpointing an individual's geographic origin may contribute to definitive forensic identification of contemporary human skeletal remains in cases where dental records and other means of identification are either unavailable to law enforcement personnel or do not yield immediate results. Stable isotope

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Brunet, Frédéric. "Variations de la signature isotopique (delta)13 C du carbone inorganique dissous dans les rivières et les fleuves." Toulouse 3, 2004. http://www.theses.fr/2004TOU30228.

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L'objectif scientifique de ce travail est de mieux comprendre les transferts de carbone par les fleuves vers les océans et d'identifier les différents processus biogéochimiques susceptibles de contrôler ces transferts, à l'aide des signatures isotopiques (d13C) du carbone. Pour ce faire, 25 bassins versants ont été étudiés à travers le monde, en allant de petits bassins versants élémentaires jusqu'aux grands bassins fluviaux. Les résultats obtenus mettent en évidence un contrôle majeur du d13CCID par le dégazage de CO2 vers l'atmosphère et par l'oxydation du carbone organique (allochtone et au

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Woodruff, Olivia P. "TEMPORAL AND SPATIAL CHARACTERIZATION OF MACONDO 252 SIGNATURES IN GULF OF MEXICO SHELF AND SLOPE SEDIMENTS." UKnowledge, 2014. http://uknowledge.uky.edu/ees_etds/17.

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The long-term fate of hydrocarbons in the Gulf of Mexico (GOMx) following the 2010 Deepwater Horizon oil spill has yet to be fully characterized. Elemental (% C and % N), stable isotopes (δ13Corganic), and polycyclic aromatic hydrocarbon (PAH) molecular signatures were investigated in shelf and slope sediments collected in October 2010 and 2011 to gain insight into processes affecting the distribution and fate of spilled Macondo oil. Particulate organic carbon (POC) ranged between 1.55 and 2.22 wt. % in 2010 and 0.55 and 2.06 % in 2011 while the corresponding δ13Corganic ranges were from -23.3

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Le, Quilleuc Meryll. "Caractérisation élémentaire et isotopique (Sr et Nd) des dépôts d'aérosols sahariens sur la marge sénégalaise : implications pour la signature géochimique des sources." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R075.

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Les aérosols désertiques émis dans les régions arides et semi-arides constituent un élément actif du système climatique global. En effet, de par leurs propriétés optiques et leur rôle dans les processus de nucléation dans l’atmosphère, ils ont un impact sur le bilan radiatif et le cycle hydrologique. Ils ont également une influence sur les cycles biogéochimiques marins et continentaux par l’apport de micro-nutriments dans les régions où ils se déposent. Par ailleurs, les aérosols désertiques sont des indicateurs des changements paleo-environnementaux dans les archives sédimentaires. L’impact d

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Meite, Fatima. "Transformation et transport des pesticides inorganiques et de synthèse dans les sols de bassins versants agricoles." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAH003/document.

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Malgré les tests d’homologation des pesticides et métaux, des teneurs alarmantes de ces produits sont relevées dans l’environnement. Une meilleure connaissance des processus subis par ces produits dans les agrosystèmes est nécessaire afin de réduire les pollutions liées à leur utilisation. Cette thèse vise à améliorer la compréhension de la transformation et du transport des pesticides et métaux pas l’étude détaillée de ces polluants dans les sols agricoles durant 200 jours, en fonction des conditions hydro-climatiques et l’analyse isotopique des pesticides (par composés spécifiques, CSIA) et

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