Bibliografías temáticas / Delta13C

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Literatura académica sobre el tema "Delta13C"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 10 de marzo de 2023

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Artículos de revistas sobre el tema "Delta13C"

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Hobson, Keith A. y Don M. Schell. "Stable carbon and nitrogen isotope patterns in baleen from eastern Arctic bowhead whales (Balaena mysticetus)". Canadian Journal of Fisheries and Aquatic Sciences 55, n.º 12 (1 de diciembre de 1998): 2601–7. http://dx.doi.org/10.1139/f98-142.

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Previous measurements of naturally occurring stable isotopes of carbon (delta13C) and nitrogen (delta15N) along the baleen plates of western Arctic bowhead whales (Balaena mysticetus) have provided a continuous lifetime record of the feeding or nutritional ecology of these animals that migrate annually between isotopically different foodwebs. However, virtually nothing was known about isotopic patterns of eastern Arctic bowheads. We measured delta13C and delta15N values along the baleen plates of three eastern and one western Arctic bowhead whales taken from Canadian waters in 1988 and 1996. In contrast to western Arctic animals, we found strong evidence for periodic fluctuations in delta15N but not delta13C values in the eastern Arctic specimens. We interpret these results as evidence that eastern Arctic animals do not move between foodwebs that differ in delta13C signature and suggest that these whales either (i) move annually between areas isotopically enriched in 15N but not 13C, (ii) shift diet annually by about one third of a trophic level, or (iii) undergo seasonal fasting that results in enrichment of baleen delta15N resulting from protein catabolism.
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Neilson, Roy, Linda L. Handley, David Robinson, Charlie M. Scrimgeour y Derek J. F. Brown. "Natural abundances of 15N and 13C indicating physiological responses in Petunia hybrida to infection by longidorid nematodes and nepoviruses". Nematology 1, n.º 3 (1999): 315–20. http://dx.doi.org/10.1163/156854199508180.

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Abstract The effects of a) systemic virus infection (arabis mosaic and tomato black ring nepoviruses), b) ectoparasitic nematode feeding (Xiphinema diversicaudatum and Longidorus elongatus) and c) a combination of virus infection and nematode feeding on the natural abundances of 13C(delta13C) and 15N(delta15N) of nitrogen-starved Petunia hybrida were studied. Pathogen-induced effects were not confined to sites of virus infection or nematode feeding. Those treatments with nematodes feeding on Petunia hosts and those with a combination of virus infection and nematode feeding resulted in a depletion of shoot and root 15N compared with controls. Virus-infected plants were more 15N-enriched than those fed upon by nematodes which, in turn, were more 15N-enriched than those with both nematode and virus in combination. Shoot delta13C values from infected treatments were not significantly different from controls. Although root delta13C was significantly different from controls in most treatments, absolute differences were small. Differences in delta15N between infected and control plants were probably caused by physiological responses to pathogen infection/feeding such as production of PR-proteins and/or release of nitric oxide. Le contenu naturel en 15N et 13C comme indicateur de la reaction de Petunia hybrida a l'infestation par les nematodes Longidorides et les nepovirus - La presente etude a porte sur l'influence i) d'une infection virale systemique (nepovirus de la mosaique Arabis et du cercle noir de la tomate), ii) d'une atteinte par des nematodes ectoparasites (Xiphinema diversicaudatum et Longidorus elongatus) et iii) d'une combinaison de deux types de pathogenes sur le contenu naturel en 13C(delta13C) et en 15N(delta15N) de Petunia hybrida deficients en azote. Les effets induits par ces organismes pathogenes ne sont pas limites aux sites de l'infection virale ou a ceux des attaques des nematodes. Compares aux temoins, les traitements comportant les seules attaques de nematodes et ceux comportant des attaques combinees des deux types de parasites provoquent une diminution du 15N des racines et des parties aeriennes. Les plants infectes par les virus avaient un taux en 15N plus eleve que ceux attaques par les nematodes, lesquels, en revanche, contenaient plus de 15N que les plants soumis simultanement aux deux types de parasites. Les taux de delta13C dans les parties aeriennes des plants soumis aux differentes attaques n'etaient pas significativement differents de ceux des temoins. Si, dans la plupart des traitements, les taux de delta13C dans les racines etaient significativement differents de ceux des temoins, ces differences restaient faibles en valeur absolue. Les differences dans les taux en delta15N entre plants infectes et temoins sont probablement la resultante de reactions physiologiques aux pathogenes, telles la production de proteines PR ou l'emission d'oxyde nitrique.
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SAURER, M., K. AELLEN y R. SIEGWOLF. "Correlating delta13C and delta18O in cellulose of trees". Plant, Cell and Environment 20, n.º 12 (diciembre de 1997): 1543–50. http://dx.doi.org/10.1046/j.1365-3040.1997.d01-53.x.

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Johnsen, Kurt H., Lawrence B. Flanagan, Dudley A. Huber y John E. Major. "Genetic variation in growth, carbon isotope discrimination, and foliar N concentration in Picea mariana: analyses from a half-diallel mating design using field-grown trees". Canadian Journal of Forest Research 29, n.º 11 (1 de diciembre de 1999): 1727–35. http://dx.doi.org/10.1139/x99-144.

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We performed genetic analyses of growth, carbon isotope discrimination (delta13C), and foliar N concentration using a half-diallel subset of a 7 × 7 complete diallel planted on three sites ranging in water availability. Trees were 22 years old. Heritabilities; general and specific combining abilities; as well as phenotypic, genetic, and environmental correlations were calculated using the best linear unbiased prediction and restricted maximum-likelihood methods. The four traits measured showed variable levels of genetic control. The calculated heritablilities for the traits were as follows: height, 0.39 ± 0.22 (estimate ± SD); diameter, 0.14 ± 0.10; delta13C value, 0.54 ± 0.26; and foliar N, 0.00. Phenotypic correlations were moderate (r = -0.35), genetic correlations were strong (r = -0.97), and environmental correlations were weak (r = -0.18) between height growth and delta13C. The strong negative genetic correlation between delta13C and growth supports earlier work with a subset of families indicating photosynthetic differences caused genetic variation in delta13C. Inbreeding greatly decreased growth while not impacting delta13C. High heritability, lack of inbreeding depression, and low environmental correlations indicate that a major proportion of delta13C genetic control may be relatively simple. Because delta13C is highly heritable, highly genetically correlated to growth, less environmentally sensitive than growth, and has the possibility of early selection, the trait is a good candidate trait for indirect selection for growth.
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5

Garcia, Alexandre M., David J. Hoeinghaus, João P. Vieira, Kirk O. Winemiller, David M. L. Motta Marques y Marlise A. Bemvenuti. "Preliminary examination of food web structure of Nicola Lake (Taim Hydrological System, south Brazil) using dual C and N stable isotope analyses". Neotropical Ichthyology 4, n.º 2 (junio de 2006): 279–84. http://dx.doi.org/10.1590/s1679-62252006000200014.

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Taim Ecological Reserve is located within the Taim Hydrological System and was created to protect a heterogeneous and productive landscape harboring exceptional biological diversity in southern Brazil. Using stable isotope ratio analyses of carbon (delta13C) and nitrogen (delta15N), we provide a preliminary description of the food web structure, including estimates of production sources supporting fish populations and vertical trophic structure, within a representative lake of this system. A total of 21 organisms (5 macrophytes, 3 mollusks and 13 adult fishes) representing 16 species were collected for isotope analysis. Fishes had delta13C values ranging from -24.30º/oo to -28.31º/oo , showing concordance with the range of values observed for macrophytes (-25.49 to -27.10º/oo), and suggesting that these plants could be a major carbon source supporting these fishes. delta13C signatures of Corbicula (-30.81º/oo) and Pomacea (-24.26º/oo) indirectly suggest that phytoplankton and benthic algae could be alternative carbon sources for some consumers. Nitrogen isotope ratios indicated approximately three consumer trophic levels. The pearl cichlid Geophagus brasiliensis was a primary consumer. Two catfishes (Trachelyopterus lucenai and Loricariichthys anus) were secondary consumers. Two congeneric pike cichclids (Crenicichla lepidota and C. punctata), a catfish (Pimelodus maculatus) and the characids Astyanax fasciatus and Oligosarcus robustus were tertiary consumers. Further studies including additional primary producers and consumers and greater sample numbers should be conducted to provide a more complete and detailed description of food web structure and dynamics within the reserve.
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Carelli, Maria Luiza Carvalho, Rachel Benetti Queiroz-Voltan, Joel Irineu Fahl y Paulo César Ocheuze Trivelin. "Leaf anatomy and carbon isotope composition in Coffea species related to photosynthetic pathway". Brazilian Journal of Plant Physiology 15, n.º 1 (abril de 2003): 19–24. http://dx.doi.org/10.1590/s1677-04202003000100003.

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Possible presence of vascular bundle sheath cells and its relation to photosynthetic pathway, leaf anatomy and carbon isotope composition (delta13C) were examined in six species of genus Coffea: C. arabica (cvs. Catuaí Vermelho, Mundo Novo, Bourbon Vermelho and Icatu Amarelo), C. canephora (cvs. Apoatã and Guarini), C. liberica, C. dewevrei, C. salvatrix and C. stenophylla. In all genotypes, the vascular bundle was surrounded by a layer of cells with numerous chloroplasts in a centrifugal position. Visually no differences could be seen between the spongy parenchyma cells and the bundle sheath cells, neither in size nor in chloroplast number. The leaf delta13C values ranged between a maximum of - 26.2 ‰ in C. salvatrix and a minimum of -29.7 ‰ in C. liberica. A strong correlation (r = 0.972, p = 0.001) between delta13C and anatomical characteristics was observed in coffee species. C. salvatrix exhibited the highest delta13C values and the most compact mesophyll, with more palisade and spongy parenchyma cells in contact with the vascular bundle sheath.
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Guerra, Núbia C., Chang H. Kiang y Alcides N. Sial. "Carbonate cements in contemporaneous beachrocks, Jaguaribe beach, Itamaracá island, northeastern Brazil: petrographic, geochemical and isotopic aspects". Anais da Academia Brasileira de Ciências 77, n.º 2 (junio de 2005): 343–52. http://dx.doi.org/10.1590/s0001-37652005000200011.

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Holocene beachrocks of the Jaguaribe beach, State of Pernambuco, northeastern Brazil, consist of horizontal, cemented layers approximately 40 cm thick. The cement shows three textural varieties: (a) calciferous, surrounding siliciclastic grains, (b) micritic, with an acicular fringe; and (c) cryptocrystalline calcite in pores. Early cementation took place at the water table below beach ridges, where geochemical, hydrodynamic and, perhaps, also microbiological conditions favored rapid precipitation of aragonite and/or high-Mg calcite. delta13C values range from -1.8 to +1.5‰ for dissolved carbonate in interstitial water and from +0.2 to +2.1‰ for bioclastic components. delta18O values range from -2.8 to +0.5‰ for seawater, freshwater and interstitial water. delta13C values and diagenetic features suggest that cementation occurred in meteoric-vadose and/or marine-phreatic water by loss of CO2 during evaporation of the interstitial water. Locally, superimposed low-Mg calcite cements point to subsequent freshwater influence. Total-rock cement composition of vertically stacked beachrock beds at the Jaguaribe beach shows that the highest beachrock bed is older than the one (of same petrographic composition) situated at the current groundwater level. This implies a downward progression of cementation, which probably followed the sea-level fall after a local high stand.
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Riccomini, Claudio, Afonso C. R. Nogueira y Alcides N. Sial. "Carbon and oxygen isotope geochemistry of Ediacaran outer platform carbonates, Paraguay Belt, central Brazil". Anais da Academia Brasileira de Ciências 79, n.º 3 (septiembre de 2007): 519–27. http://dx.doi.org/10.1590/s0001-37652007000300012.

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After the late Cryogenian glaciation the central region of Brazil was the site of extensive deposition of platformal carbonates of the Araras Group. This group includes a basal cap carbonate sequence succeeded by transgressive, deep platform deposits of bituminous lime mudstone and shale. Facies and stratigraphic data combined with carbon and oxygen isotopic analyses of the most complete section of the transgressive deposits, exposed in the Guia syncline, were used to evaluate the depositional paleoenvironment and to test the correlation of these deposits along the belt and with other units worldwide. The studied succession consists of 150 m thick tabular beds of black to grey lime mudstone and shale with predominantly negative delta13C PDB values around -2.5 to -1‰ . The delta13C PDB profile of Guia syncline shows a clear correlation with the upper portion of Guia Formation in the Cáceres region, about 200 km to the southwest. The delta13C PDB profile of the Araras Group is comparable with delta13C PDB profiles of Ediacaran units of the southern Paraguay Belt, western Canada, and the Congo and Kalahari cratons. Moreover, facies distribution, stratigraphy and the carbon isotopic profile of the Araras Group match the middle Tsumeb Subgroup in Namibia, which reinforces the Ediacaran age assigned to the Araras Group.
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Marguillier, S., G. van der Velde, F. Dehairs, MA Hemminga y S. Rajagopal. "Trophic relationships in an interlinked mangrove-seagrass ecosystem as traced by delta13C and delta15N". Marine Ecology Progress Series 151 (1997): 115–21. http://dx.doi.org/10.3354/meps151115.

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VUORIO, KRISTIINA, MARKUS MEILI y JOUKO SARVALA. "Taxon-specific variation in the stable isotopic signatures (delta13C and delta15N) of lake phytoplankton". Freshwater Biology 51, n.º 5 (mayo de 2006): 807–22. http://dx.doi.org/10.1111/j.1365-2427.2006.01529.x.

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Tesis sobre el tema "Delta13C"

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MOLINA, FLAVIO FERNANDES. "HIDROCARBON AND STABLE ISOTOPE (DELTA13C E DELTA15N) SOURCES IN GRUSSAÍ AND ALMIRANTE CÂMARA CANYON SEDIMENTS, CAMPOS BASIN–RIO DE JANEIRO". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19895@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
A avaliação da fonte e origem de hidrocarbonetos e isótopos estáveis em sedimentos dos Cânions Grussaí e Almirante Câmara fazem parte do projeto HABITATS, que visa a caracterização ambiental da Bacia de Campos e a melhor compreensão da dinâmica do ecossistema. Neste estudo foram avaliados diversos parâmetros orgânicos como hidrocarbonetos alifáticos, aromáticos, hopanos e esteranos assim como a razão isotópica de carbono e nitrogênio. A fração alifática indica ao longo dos cânions a contribuição de plantas vasculares terrestres, bem como resíduos produtos derivados de petróleo, possivelmente de fluídos de perfuração não-aquosos ou material semelhante. A distribuição da concentração de hopanos e esteranos é característico da presença de óleo recente em todas as estações, o que pode estar associado a exsudações naturais de petróleo. A avaliação das concentrações de HPAs, auxiliadas por razões diagnósticas sugerem fonte pirogênica de contribuição. Na campanha de inverno, observa-se no Cânion Almirante Câmara um forte predomínio da queima de biomassa, no entanto, a razão isotópica de carbono e nitrogênio indica um material orgânico de origem tipicamente marinha, não corroborando as informações obtidas pelas analises de hidrocarbonetos. O largo numero de estações e parametros empregados permitem uma visão amplificada para avaliação.
The assessment of source and origin of hydrocarbons and stable isotopes in sediments from Grussaí and Almirante Câmara canyons is part of the HABITATS Project, which aim to characterize the environment of Campos Basin e a better understanding of the ecosystem dynamics. On this study several organic parameters were evaluate, such aliphatic and aromatic hydrocarbons, hopane, sterane and also the isotopic ratio of carbon and nitrogen. The aliphatic fraction over the canyons indicates the contribution of vascular land plants as well as residue oil products, possibly drilling non-aqueous fluids or similar material. The concentration distribution of hopanes or steranes is characteristic at all stations of recent presence of oil, which can be associated to natural oil seeps.The assessment of PAHs concentrations, assisted by diagnostic ratios suggests pyrogenic source contribution. In the winter campaign, is observed in Almirante Câmara canyon a predominance of biomass burning source, however, the isotopic ratio of carbon and nitrogen indicates marine source, which do not corroborate the information obtained by analysis of hydrocarbons. The large number of stations and parameters analyzed allow an amplified view for evaluation.
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Gaye-Siessegger, Julia [Verfasser]. "Influence of feeding level and diet composition on delta13C and delta15N values in fish and their correlation with enzyme activities / Julia Gaye-Siessegger". Aachen : Shaker, 2005. http://d-nb.info/1181615488/34.

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Assayag, Nelly. "Traçage isotopique des sources, puits et de la réactivité du C02 dans les réservoirs géologiques". Paris, Institut de physique du globe, 2006. http://www.theses.fr/2006GLOB0014.

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Le but de ces travaux de thèse fut de tester la performance des outils géochimiques (DIC(carbone inorganique dissous), delta13C, delta18O) afin de suivre le devenir du CO2 injecté dans des réservoirs géologiques. Dans un premier temps, un protocole analytique a été mis au point afin de mesurer l'outilDIC-delta13C, par spectrométrie de masse à flux continu. Le premier site d'étude était le lac Pavin (Massif Central, France) ; ses couches d'eaux profondes isolées, renferment d'importantes quantités de CO2. Cette particularité permet de l'assimiler à un réservoir géologique stockant d'importantes quantités de CO2 d'origine biogénique et magmatique (fournit par une source sous lacustre). L'outil DIC-delta13C a permisde montrer d'une part, que la réactivité et les sources et puits de DIC étaient essentiellementgouvernés par des processus biogéochimiques (photosynthèse, oxydation de la matièreorganique, méthanotrophie, méthanogénèse) et d'autre part, de détecter un transfert de CO2entre les couches d'eaux superficielles et profondes du lac. Le second était le site expérimental du Lamont Doherty (NY, USA) composé d'un puitsde forage instrumenté. Des injections de fluide saturé en CO2 ont été réalisées au niveau d'une zone perméable, à l'interface de roches basiques et sédimentaires. Après une pèrioded'incubation, l'évolution des compositions chimiques (DIC, Ca2+, Mg2+. . . ) et isotopiques(delta13C, delta18O) des fluides extraits ont mis en évidence des processus de mélange entre le fluideinjecté et l'eau de l'aquifère ainsi que des interactions CO2-eau-roche : principalement ladissolution de calcite, et à un ordre moindre la dissolution des minéraux silicatés. De même,l'outil delta13C-DIC a mis en évidence un dégazage de CO2, in situ
The aim of this research works consisted in studying the behaviour of the carbonate system (dissolved inorganic carbon: DIC) following a CO2 injection (artificial or natural), in geological reservoirs. One part of the study consisted in improving an analytical protocol for the measurementof delta13CDIC and DIC, using a continuous flow mass spectrometer. As a first study, we have focused our attention on the Pavin Lake (Massif Central,France). Owing to its limnologic characteristics (meromictic lake) and a deep volcanic CO2contribution, it can be viewed as a natural analogue of reservoir storing important quantitiesof CO2 in the bottom part. Isotopic measurements (delta18O, delta13CDIC) allowed to better constrainthe dynamics of the lake (stratification, seasonal variations), the magnitudes of biologicalactivities (photosynthesis, organic matter decay, methane oxidation, methanogenesis), carbonsources (magmatic, methanogenetic), and the hydrological budgets (sublacustrine inputs). The second study was conducted on the Lamont-Doherty test well site (NY, USA). Itincludes an instrumental borehole which cuts through most of the section of the Palisades silland into the Newark Basin sediments. Single well push-pull tests were performed: a testsolution containing conservative tracers and a reactive tracer (CO2) was injected at apermeable depth interval located in basaltic and metasedimentary rocks. After an incubationperiod, the test solution/groundwater mixture was extracted from the hydraulically isolatedzone. Isotopic measurements (delta18O, delta13CDIC) confronted to chemical data (major elements)allowed to investigate the extent of in-situ CO2-water-rock interactions: essentially calcite dissolution and at a lesser extend silicate dissolution. . . And for one of the test, CO2 degassing
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Comstedt, Daniel. "Explaining temporal variations in soil respiration rates and delta13C in coniferous forest ecosystems". Doctoral thesis, Örebro universitet, Institutionen för naturvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-2055.

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Soils of Northern Hemisphere forests contain a large part of the global terrestrial carbon (C) pool. Even small changes in this pool can have large impact on atmospheric [CO2] and the global climate. Soil respiration is the largest terrestrial C flux to the atmosphere and can be divided into autotrophic (from roots, mycorrhizal hyphae and associated microbes) and heterotrophic (from decomposers of organic material) respiration. It is therefore crucial to establish how the two components will respond to changing environmental factors. In this thesis I studied the effect of elevated atmospheric [CO2] (+340 ppm, 13C-depleted) and elevated air temperature (2.8-3.5 oC) on soil respiration in a whole-tree chamber (WTC) experiment conducted in a boreal Norway spruce forest. In another spruce forest I used multivariate modelling to establish the link between day-to-day variations in soil respiration rates and its δ13C, and above and below ground abiotic conditions. In both forests, variation in δ13C was used as a marker for autotrophic respiration. A trenching experiment was conducted in the latter forest in order to separate the two components of soil respiration. The potential problems associated with the trenching, increased root decomposition and changed soil moisture conditions were handled by empirical modelling. The WTC experiment showed that elevated [CO2] but not temperature resulted in 48 to 62% increased soil respiration rates. The CO2-induced increase was in absolute numbers relatively insensitive to seasonal changes in soil temperature and data on δ13C suggest it mostly resulted from increased autotrophic respiration. From the multivariate modelling we observed a strong link between weather (air temperature and vapour pressure deficit) and the day-to-day variation of soil respiration rate and its δ13C. However, the tightness of the link was dependent on good weather for up to a week before the respiration sampling. Changes in soil respiration rates showed a lag to weather conditions of 2-4 days, which was 1-3 days shorter than for the δ13C signal. We hypothesised to be due to pressure concentration waves moving in the phloem at higher rates than the solute itself (i.e., the δ13C–label). Results from the empirical modelling in the trenching experiment show that autotrophic respiration contributed to about 50% of total soil respiration, had a great day-to-day variation and was correlated to total soil respiration while not to soil temperature or soil moisture. Over the first five months after the trenching, an estimated 45% of respiration from the trenched plots was an artefact of the treatment. Of this, 29% was a water difference effect and 16% resulted from root decomposition. In conclusion, elevated [CO2] caused an increased C flux to the roots but this C was rapidly respired and has probably not caused changes in the C stored in root biomass or in soil organic matter in this N-limited forest. Autotrophic respiration seems to be strongly influenced by the availability of newly produced substrates and rather insensitive to changes in soil temperature. Root trenching artefacts can be compensated for by empirical modelling, an alternative to the sequential root harvesting technique.
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Chapman, Taylor W. "Evaluating the delta13C Value of n-Alkanes as a Recorder of Atmospheric Chemistry". Thesis, University of Louisiana at Lafayette, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10286476.

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Changes in the concentration of atmospheric carbon dioxide (pCO2) affect global climate. Accurate determination of paleo-pCO2 can therefore provide information on the response of climate to changing pCO2. Such pCO2 proxies have been developed from a variety of terrestrial (e.g., plant stomata, paleosol carbonate, and liverworts) and marine (e.g., alkenones and boron) substrates. However, these proxies show a wide range of values and uncertainty throughout the Cenozoic and especially for the early Paleogene (53-63 mya). Here, I demonstrate the use of the carbon isotope composition of n-alkanes extracted from C3 plant waxes as an accurate recorder of changes in atmospheric chemistry. My results show that the uncertainty and range of pCO2 estimates determined using this new proxy are similar to other proxies. Because n-alkanes are abundant, chemically resistant, and not subject to degradation, this proxy represents an excellent opportunity to reconstruct pCO2 across the last 400 Myr of Earth history. By examining across 4 different chain lengths (n-27, n-29, n- 31, and n-33), I find that only n-29 and n-31 show clear changes in carbon isotope discrimination in response to changes pCO2, whereas chain-lengths n-27 and n-31 did not show any significant response. Using chain lengths n-29 and n-31, I calculate early Paleogene pCO2 = 566 ? 190 and 469 ? 165 ppmv (median ? 1?), respectively. These results demonstrate that n-alkanes can serve as a potential pCO2 proxy across geologic timescales.

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Gressier, Vincent. "Contribution des producteurs carbonatés phytoplanctoniques à l'évolution isotopiques (delta13C et delta18O ) des carbonates pélagiques des bassins Ouest téthysiens au cours de l'événement Valanginien (Weissert Event)". Paris 6, 2010. http://www.theses.fr/2010PA066630.

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Les reconstructions paléoclimatiques sont classiquement basées sur l’analyse géochimique de sédiments pélagiques. Néanmoins, les travaux sont parfois rendus difficiles du fait du mélange dans les sédiments analysés de particules de diverses origines. L’hypothèse de départ est de comprendre comment la composition relative des différents types de particules peut contraindre la signature géochimique globale mesurée sur carbonate total. L’application de cette problématique a été réalisée sur des séries pélagiques du Crétacé inférieur des bassins Vocontien et Ibérique. L’obtention des signatures isotopiques de chaque type de particule est rendue possible par l’utilisation d’un protocole de microfiltration sur membrane de 60µm à 2µm. Les valeurs isotopiques du carbone obtenues sur les coccolithes et les Nannoconus montrent une évolution comparable à celle enregistrées par la roche totale. Ainsi, ces mesures du 13C confirment qu’au moins la totalité de la zone photique est affectée par la perturbation du cycle du carbone du Valanginien. Alors que les travaux antérieurs sur bélemnites évoquaient un refroidissement lors de l’événement Weissert, les données sur l’oxygène des coccolithes et des Nannoconus indiquent un réchauffement. Ceci nous conduit à proposer une stratification de la colonne d’eau avec des échanges très restreints entre les masses superficielles (coccolithes+Nannoconus) et les masses sous-jacentes (bélemnites). Cette stratification permettrait une augmentation de la séquestration de matière organique dans des fonds dioxiques et serait responsable de l’excursion positive du carbone observée.
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Blondel, Cécile. "Les ongulés à la limite Eocène/Oligocène et au cours de l'Oligocène en Europe occidentale : analyses faunistiques, morpho-anatomiques et biogéochimiques (delta13C, delta18O). Implications sur la reconstitution des paléoenvironnements". Montpellier 2, 1996. http://www.theses.fr/1996MON20247.

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Un bilan sur l'histoire des ongules du paleogene d'europe occidentale est etabli d'apres l'etude de deux groupes particulierement representatifs dans les faunes de cette periode: les ruminants de l'oligocene et les cainotheriidae post-grande coupure. Ces etudes systematiques qui reposent sur un materiel inedit provenant des gisements dates des phosphorites du quercy completent largement les resultats des travaux anterieurs consacres aux ongules de cette epoque. L'histoire des ongules est marquee par differentes phases (extinctions, apparitions par diversification ou par immigration, adaptations, changements dans les proportions relatives des artiodactyles et des perissodactyles) liees aux modifications de l'environnement. Dans cette perspective, la diversite relative de ces deux groupes ainsi que les modifications observees, tant sur le plan dentaire que sur le plan du squelette appendiculaire sont analysees. Sur ce dernier point, une etude consacree plus specialement aux differents ruminants a permis, sur la base d'observations effectuees sur des ruminants actuels, de les situer dans leur environnement respectif. Toujours dans ce cadre, une analyse de micro-usures des facettes dentaires d'artiodactyles a dents selenodontes pre-et-post grande coupure est realisee a titre experimental. Enfin, les variations isotopiques du carbone et de l'oxygene de la carbonate hydroxylapatite de l'email dentaire d'ongules eocenes/oligocenes sont analysees afin d'etablir des correlations avec les courbes de d#1#3c et d#1#8o determinees en milieu marin
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Holstermann, Max Diederich [Verfasser]. "Änderungen des Fettsäuremusters und der delta13C-Werte im Milchfett als Indikatoren für die Körperfettmobilisierung bei Kühen / Max Diederich Holstermann". Aachen : Shaker, 2012. http://d-nb.info/106773600X/34.

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Siess, Kourtney. "Variability in delta13C and delta 15N values of Steller sea lion pup vibrissae| Implications for diet and foraging studies". Thesis, Alaska Pacific University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1555182.

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During the 1970s to the 1990s, Steller sea lions (Eumetopias jubatus) in Alaska declined severely, resulting in the western stock's listing as endangered under the United States Endangered Species Act. The localized depletion of their main food source around rookeries and haul out sites was the primary cause of their depletion. The western stock has still not recovered to historical levels. Therefore, scientists have continued to study Steller sea lions diet and foraging habits. One approach has been through stable isotope analysis of their various tissues. Analysis of their vibrissae, or whiskers, provides an exact record of an individual's diet from birth to the present. However, scientists so far have only measured stable isotope values of a single vibrissa from an individual, assuming no significant difference among vibrissae within or between cheeks. They have not accounted for the possibility of variable stable isotope accumulation in an individual's different vibrissae. In this study, I tested the assumption of no significant individual variability among vibrissae by examining the δ13C and δ 15N values in all of the vibrissae on five Steller sea lion pups recovered in Alaska. δ15N values did not differ between vibrissae on a cheek or between vibrissae from left and right cheeks. The δ 13C values did not differ between vibrissae within cheeks; however, δ 13C values were significantly different between the left and right cheeks of Lowrie Island Pup and PWS 29 Pup. This between cheek variation is most likely due to small sample size rather than different stable isotope incorporation. The lack of δ15N value variation within or between cheeks, as well as the lack of δ13C variation within cheeks, supports the assumption that stable isotope accumulation is similar between all vibrissae and validates sampling protocols of previous studies collecting just the longest, thick vibrissa from a Steller sea lion. More studies similar to this one are needed to verify these findings and to look at variability in stable isotope incorporation of juvenile and adult Steller sea lion vibrissae as well as other mammal species.

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Danger, Florence. "Etude de la signature isotopique du carbone (delta13C) du CO2 respiré et du cerne en relation avec le fonctionnement de l’arbre". Paris 11, 2007. http://www.theses.fr/2007PA112284.

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Dans le contexte actuel de l’augmentation de la concentration en CO2 dans l’atmosphère, l’étude du fonctionnement des forêts tempérées comme puits ou sources de C est essentielle. Les études fonctionnelles à des échelles plus fines, comme celle de l’arbre, permettent d’améliorer les estimations des flux de C dans les écosystèmes forestiers. Ce travail de thèse examine principalement les signaux isotopiques (quantité de 13C par rapport au 12C, delta13C) de deux composantes du bilan carboné à l’échelle de l’arbre : 1) Le delta13C du CO2 respiré par l’arbre avec en particulier la caractérisation des variations temporelles du delta13C du CO2 respiré par le tronc en relation avec le fonctionnement de l’arbre. Nos résultats montrent une forte variabilité du delta13C du CO2 respiré par le tronc due à des changements à la fois de delta13C des substrats respiratoires et de l’intensité d’utilisation de ces substrats. 2) Le delta13C du cerne comme indicateur du fonctionnement de l’arbre en réponse au climat. Ce travail a montré que lors de la formation du bois final, les variations du delta13C des sucres assimilées par les feuilles sont transmises et enregistrées dans le delta13C du cerne. Ces résultats valident par une approche fonctionnelle l’utilisation du delta13C du cerne comme archive des réponses fonctionnelles de l’arbre au climat. En améliorant la compréhension des signaux isotopiques, ce travail de thèse permet d’avancer dans leur interprétation à des échelles spatio-temporelles plus grandes, comme dans l’étude des composantes du bilan de C à l’échelle de l’écosystème ou des réponses des forêts aux variations inter-annuelles du climat
Because of the current atmospheric CO2 increase, study of temperate forest functioning as C source or sink becomes essential. Functional studies at smaller scales, like tree scale, allow to improve C flux estimates at the forest level. This thesis work mainly examines isotopic signals (13C quantity compared to 12C, delta13C) of two components of tree-C balance : 1) delta13C of CO2 respired by tree and characterization of its temporal variations, in relation to tree functioning. Our results showed a high variability of respired CO2 delta13C due to changes either in respiratory substrate delta13C or in intensity of substrate use. 2) Ring delta13C as an indicator of tree functioning in response to climate changes. This work showed that during latewood formation, variations of delta13C of new assimilated sugars were transmitted and recorder in the ring delta13C. These results validate, by a functional approach, the use of ring delta13C as an archive of tree functional responses to climatic conditions. These studies improve the understanding the tree isotopic signals and their interpretation at larger spatial and temporal scales, like in the study of ecosystem C balance or in the study of forest responses to inter-annual climate changes
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Libros sobre el tema "Delta13C"

1

1934-, Johnson Kenneth Sutherland, United States. Dept. of Energy. Bartlesville Project Office. y Oklahoma Geological Survey, eds. Deltaic reservoirs in the southern Midcontinent, 1993 symposium. Norman, Oklahoma: University of Oklahoma, 1996.

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D, Andrews Richard, Campbell Jock A, Northcutt Robert A y Oklahoma Geological Survey, eds. Fluvial-dominated deltaic (FDD) oil reservoirs in Oklahoma: The Bartlesville play. Norman, Okla: University of Oklahoma, 1997.

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D, Andrews Richard y Oklahoma Geological Survey, eds. Fluvial-dominated deltaic (FDD) oil reservoirs in Oklahoma: The Booch play. Norman, Okla: University of Oklahoma, 1995.

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Pastirik, George Paul. The sedimentology of unconsolidated deltaic and aeolian sediments east of Dunnville, Ontario. St. Catharines [Ont.]: Dept. of Earth Sciences, Brock University, 1985.

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D, Andrews Richard y Oklahoma Geological Survey, eds. Fluvial-dominated deltaic (FDD) oil reservoirs in Oklahoma: The Red Fork play. Norman, Okla: University of Oklahoma, 1997.

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Higgs, Roger. Upper Carboniferous lacustrine and deltaic sedimentology, S.W. England: Westward Ho! and Bude. [Reading]: British Sedimentological Research Group, 1991.

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D, Andrews Richard, Campbell Jock A, Northcutt Robert A y Knapp R. M, eds. Fluvial-dominated deltaic (FDD) oil reservoirs in Oklahoma: The Cleveland and Peru plays. Norman, Okla: University of Oklahoma, 1997.

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D, Andrews Richard y Oklahoma Geological Survey, eds. Fluvial-dominated deltaic (FDD) oil reservoirs in Oklahoma: The Skinner and Prue plays. Norman, Okla: University of Oklahoma, 1996.

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D, Andrews Richard y Oklahoma Geological Survey, eds. Fluvial-dominated deltaic (FDD) oil reservoirs in Oklahoma: The Layton and Osage-Layton play. Norman, Okla: University of Oklahoma, 1996.

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Mohanty, Sheelabhadra. Groundwater assessment in Kathajodi-Surua inter-basin for sustainable water resources management in deltaic aquifers. Bhubaneswar: Directorate of Water Management, Indian Council of Agricultural Research, 2014.

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Capítulos de libros sobre el tema "Delta13C"

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Schomburg, Dietmar, Margit Salzmann y Dörte Stephan. "15-Oxoprostagiandin DELTA13-reductase". En Enzyme Handbook, 569–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-58051-2_121.

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Charles, J. Andrew, Ljubomir Tančev, Reginald W. Herschy, Reginald W. Herschy, Klas Cederwall, Isaac Gertman, Reginald W. Herschy et al. "Deltaic Swamps". En Encyclopedia of Lakes and Reservoirs, 216–17. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-1-4020-4410-6_67.

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Rybczyk, John. "Deltaic Ecology". En Encyclopedia of Earth Sciences Series, 681–84. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-93806-6_113.

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Rybczyk, John. "Deltaic Ecology". En Encyclopedia of Earth Sciences Series, 1–5. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-48657-4_113-2.

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Kelletat, Dieter, Jiyu Chen, John M. Rybczyk, Shea Penland, Mark A. Kulp, Iver W. Duedall, George A. Maul et al. "Deltaic Ecology". En Encyclopedia of Coastal Science, 359–62. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3880-1_113.

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Schomburg, Dietmar, Margit Salzmann y Dörte Stephan. "Cucurbitacin DELTA23-reductase". En Enzyme Handbook, 379–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-58051-2_78.

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Coleman, James M. y H. H. Roberts. "Deltaic coastal wetlands". En Coastal Lowlands, 1–24. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-017-1064-0_1.

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Semeniuk, Vic y Christine Semeniuk. "Estuarine Deltaic Wetlands". En Encyclopedia of Estuaries, 260–72. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-8801-4_308.

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Yu, Xinghe, Shengli Li y Shunli Li. "Deltaic Depositional System". En Clastic Hydrocarbon Reservoir Sedimentology, 461–571. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70335-0_11.

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Syvitski, James P. M., David C. Burrell y Jens M. Skei. "The Fluvial-Deltaic Environment". En Fjords, 73–110. New York, NY: Springer New York, 1987. http://dx.doi.org/10.1007/978-1-4612-4632-9_3.

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Actas de conferencias sobre el tema "Delta13C"

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Sturmer, Daniel M., Kristopher Purens y Simon Poulson. "USING LEAST-SQUARES SPECTRAL ANALYSIS TO TEST THE PROPOSED CORRELATION BETWEEN WHOLE-ROCK DELTA13C EXCURSIONS AND LITHOLOGIC CYCLES DURING THE LATE PALEOZOIC ICE AGE: ELY-BIRD SPRING BASIN, NEVADA, USA". En GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-338576.

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Plink-Bjorklund, Piret. "TIDES AND DELTAIC MORPHODYNAMICS". En GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-279594.

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Darken, Christian J., Bradley G. Anderegg y Perry L. McDowell. "Game AI in Delta3D". En 2007 IEEE Symposium on Computational Intelligence and Games. IEEE, 2007. http://dx.doi.org/10.1109/cig.2007.368114.

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McConnell, Joseph R., Fan Qing Chen y Norman L. Busby. "Seismic mapping of deltaic sands". En SEG Technical Program Expanded Abstracts 1988. Society of Exploration Geophysicists, 1988. http://dx.doi.org/10.1190/1.1892414.

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Badyukova, Ekaterina, Ekaterina Badyukova, Leonid Zhindarev, Leonid Zhindarev, Svetlana Lukyanova, Svetlana Lukyanova, Galina Solovieva y Galina Solovieva. "LARGE BARRIER-LAGOON SYSTEMS ON THE EASTERN AND SOUTH-EASTERN BALTIC SEA COASTS: CONDITIONS OF DEVELOPMENT". En Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b942ecc7383.30513450.

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The paper considers the geological structure and evolution of large barrier-lagoon systems in the eastern and southeastern coasts of the Baltic Sea. The data available on some coastal deltaic plains in the Leningrad Region, Latvia and Lithuania are discussed in some details. The considered materials lead the authors to the conclusion about a unified mechanism of the systems’ development. A considerable rise of the sea level at the Littorina Sea transgression fostered large transgressive bars developing at the margins of deltaic plains and lagoons formation on the surface of these plains.
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Badyukova, Ekaterina, Ekaterina Badyukova, Leonid Zhindarev, Leonid Zhindarev, Svetlana Lukyanova, Svetlana Lukyanova, Galina Solovieva y Galina Solovieva. "LARGE BARRIER-LAGOON SYSTEMS ON THE EASTERN AND SOUTH-EASTERN BALTIC SEA COASTS: CONDITIONS OF DEVELOPMENT". En Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b43162835e3.

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The paper considers the geological structure and evolution of large barrier-lagoon systems in the eastern and southeastern coasts of the Baltic Sea. The data available on some coastal deltaic plains in the Leningrad Region, Latvia and Lithuania are discussed in some details. The considered materials lead the authors to the conclusion about a unified mechanism of the systems’ development. A considerable rise of the sea level at the Littorina Sea transgression fostered large transgressive bars developing at the margins of deltaic plains and lagoons formation on the surface of these plains.
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Zhang, Yongxiang y Haijuan Wei. "Biological Denitrification Technology of Sewage via delta15N Identification". En 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5162447.

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Mijnssen, F. C. J., K. J. Weber, F. J. T. Floris y E. F. Kaasschieter. "Relating Sedimentology to Production Behaviour In Deltaic Rocks". En European Petroleum Conference. Society of Petroleum Engineers, 1990. http://dx.doi.org/10.2118/20946-ms.

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Caplan, Mark, Caroline Andrea Heron, Laura Sullivan, Emeline Herle, Jesse Keith, Andrea Bernal y Ian Kenneth Atkinson. "Evaluation of SAGD Performance in a Deltaic Environment". En International Thermal Operations and Heavy Oil Symposium. Society of Petroleum Engineers, 2008. http://dx.doi.org/10.2118/117821-ms.

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"Synthetic Mudscapes: Human Interventions in Deltaic Land Building". En International Symposium for Next Generation Infrastructure Conference Proceedings. ISNGI, 2015. http://dx.doi.org/10.14324/000.cp.1469406.

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Informes sobre el tema "Delta13C"

1

Baken, Mary K. y Richard Andrews. Identification and Evaluation of Fluvial-Dominated Deltaic Reservoirs. Office of Scientific and Technical Information (OSTI), noviembre de 1997. http://dx.doi.org/10.2172/598791.

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Tribe, S. y K. Grimm. Sand dykes in late Pleistocene deltaic sediments, Fraser Lowland, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211597.

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Green, D. W., C. P. Willhlte, A. Walton, L. Schoeling, R. Reynolds, M. Michnick y L. Watney. Improved Oil Recovery in Fluvial Dominated Deltaic Reservoirs of Kansas Near Term. Office of Scientific and Technical Information (OSTI), abril de 1997. http://dx.doi.org/10.2172/644596.

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Green, Don W., A. D. McCune, M. Michnick, R. Reynolds, A. Walton, L. Watney y G. Paul Willhite. Improved Oil Recovery in Fluvial Dominated Deltaic Reservoirs of Kansas - Near-Term. Office of Scientific and Technical Information (OSTI), noviembre de 1999. http://dx.doi.org/10.2172/14186.

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Green, D. W., D. McCune, M. Michnick, R. Reynolds, A. Walton, L. Watney y Willhite G.P. Improved Oil Recovery in Fluvial Dominated Deltaic Reservoirs of Kansas - Near-Term. Office of Scientific and Technical Information (OSTI), octubre de 1999. http://dx.doi.org/10.2172/14187.

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Tim Tipton. POST WATERFLOOD CO2 MISCIBLE FLOOD IN LIGHT OIL FLUVIAL DOMINATED DELTAIC RESERVOIR. Office of Scientific and Technical Information (OSTI), abril de 2004. http://dx.doi.org/10.2172/826427.

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A. Walton, D. McCune, D.W. Green, G.P. Willhite, L. Watney, M. Michnick y R. Reynolds. Improved Oil Recovery in Fluvial Dominated Deltaic Reservoirs of Kansas - Near-Term. Office of Scientific and Technical Information (OSTI), octubre de 1997. http://dx.doi.org/10.2172/1571.

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A. Walton, D. McCune, D.W. Green, G.P. Willhite, L. Watney, R. Reynolds y m. Michnick. Improved Oil Recovery in Fluvial Dominated Deltaic Reservoirs of Kansas - Near-Term. Office of Scientific and Technical Information (OSTI), abril de 1998. http://dx.doi.org/10.2172/1572.

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A. Walton, D. McCune, D.W. Green, G.P. Willhite, L. Watney, M. Cichnick y R. Reynolds. Improved Oil Recovery in Fluvial Dominated Deltaic Reservoirs of Kansas - Near-Term. Office of Scientific and Technical Information (OSTI), julio de 1998. http://dx.doi.org/10.2172/1573.

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John Augustine. Post Waterflood C02 Miscible Flood in Light Oil Fluvial-Dominated Deltaic Reservoirs. Office of Scientific and Technical Information (OSTI), enero de 1998. http://dx.doi.org/10.2172/1574.

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