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141 results for “isotopic composition”
We are what we eat, plus some per mill: Using stable isotopes to estimate diet composition in Gyps vultures over space and time
<p><span><span><span><span><span><span><span><span><span><span><span>1. Dietary studies in birds of prey involve direct observation and examination of food remains at resting and nesting sites. Although these methods accurately identify diet in raptors, they are time consuming, resource intensive and associated with biases that stem from the feeding ecology of raptors like <i>Gyps </i>vultures (<i>Gyps africanus</i> and <i>Gyps rueppelli</i>). Our study set out to estimate diet composition in <i>Gyps </i>vultures informed by stable isotopes that provide a good representation of assimilated diet from carrion resources in local systems. </span></span></span></span></span></span></span></span></span></span></span></p> <p>2. We hypothesized that differences in <i>Gyps </i>vulture diet composition is a function of sampling location, and that these vultures move between Serengeti National Park and Selous Game Reserve to forage. We also, theorized that grazing ungulates are the principal items in <i>Gyps</i> vulture diet. </p> <p><span><span><span><span><span><span><span><span><span><span><span>3. Through a combination of linear and Bayesian models, diet derived from d<sup>13</sup>C in <i>Gyps</i> vultures consisted of grazing herbivores across study areas, with those in Serengeti National Park consuming higher proportions of grazing herbivores (> 87%). d<sup>13</sup>C differences in vulture feather subsets per site did not indicate vulture diet change, and in combination with blood d<sup>13</sup>C, vultures fed largely on grazers for ~159 days before they were sampled in both sites. Similarly, d<sup>15</sup>N values implied that <i>Gyps </i>vultures fed largely on herbivores across space and time. d<sup>34</sup>S ratios separated prey source for vultures between the two sites. d<sup>34</sup>S variation in vultures across sites resulted from differences in baseline (plant) d<sup>34</sup>S values, though it is not possible to match d<sup>34</sup>S to specific locations. </span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span>4. Our findings highlight the relevance of repeated sampling that considers tissues with varying isotopic turnover and emerging Bayesian techniques for dietary studies using stable isotopes. Findings also suggested limited vulture movement between the two local systems. However, more sampling coupled with telemetry is required to fully comprehend this observation and its implications to <i>Gyps</i> vulture ecology and conservation.</span></span></span></span></span></span></span></span></span></span></span></p>
DATA: Oxygen isotope composition of final chamber of planktic foraminifera provides evidence for vertical migration and depth integrated growth
<p>Dataset from "Oxygen isotope composition of final chamber of planktic foraminifera provides evidence for vertical migration and depth integrated growth". Three files that represent: all data (stable isotope, weight, size) for T. sacculifer; all data (stable isotope, weight, size) for G. ruber and N.dutertrei and individual final chamber and remaining shell for T. sacculifer.</p>
Datsets and RF model for oxygen isotopic compositions at Chichijima
<p>The datasets in the uploaded file include quarterly data of observed ions and oxygen-17 excess as well as predicted oxygen-17 excess between 2001 abd 2011. On the other hand, the RF model is also uploaded.</p>
compositional data for "Chromium isotope behavior during serpentinite dehydration in oceanic subduction zones"
<p>Table 1 refer to the Cr isotope results for the meta-serpentinite in this study. Table S1 shows the major and trace element compositions of the studied samples. Table S2 compiles the available Cr isotope compositions of low-grade serpentinites.</p>
New insights on micro-scale variations of geochemical and oxygen isotope compositions in conodont and shark tooth bioapatite: Datasets
<p>The files contain the Research Data for the article entitled <strong>'New insights on micro-scale variations of geochemical and oxygen isotope compositions in conodont and shark tooth bioapatite'</strong>. A table of contents is provided. In summary, the files are: the raw geochemical data (scanning electron microscopy, electron microprobe analysis, stable isotope analysis), and profilometer images showing samples’ topography (please consult the README file) used in the referred article. The data normalisation was given as Supplementary Data in the publication. Any doubt or question about these are welcomed by me (Zoneibe Luz) for discussion or further considerations.</p>
We are what we eat, plus some per mill: Using stable isotopes to estimate diet composition in Gyps vultures over space and time
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Nitrogen isotope composition of amino acids reveals trophic partitioning in two sympatric amphipods
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Dark septate endophytes and arbuscular mycorrhizal fungi (Paris-morphotype) affect the stable isotope composition of ‘classically’ non-mycorrhizal plants
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Riparian cottonwood trees and adjacent river sediments have different microbial communities and produce methane with contrasting carbon isotope compositions
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The iron isotopic composition and the elemental ratios (Cd/Ti) in the size-fractionated aerosols collected over the East China Sea
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Data for: Nitrous oxide formation by corona discharge: Isotopic composition measurements and atmospheric applications
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Sediment trap results from Amundsen Sea Polynya International Research Expedition (ASPIRE) including C, N and mass fluxes and isotopic composition, Dec 2010 - Dec 2011
The gravitational settling of particles is a major biogeochemical process linking the carbon cycles and ecosystems of the upper ocean, twilight zone and deep sea. Particle interceptor or sediment traps are used to collect settling particles and provide estimates of their vertical fluxes to various depths. We used a new Technicap 24-sample time series sediment trap deployed at 350 m depth in the Amundsen Sea polynya (73o 49’ S, 113o 04’ W, 2010-12.
Ionic and water stable isotope composition of different Mendoza River basin (Argentina) water sources
<p>Samples obtained in a high temporal resolution from different water sources of the upper Mendoza River basin (Argentinean Central Andes). Ionic and water stable isotopes compositions are expressed and electric conductivity, pH and mean catchments altitudes. Decimal positions are expressed with comma.</p>
The Effects of Glacial Cover on Riverine Silicon Isotope Compositions in Chilean Patagonia
<p>Size-fractionated Si isotope compositions from 40 rivers in Chilean Patagonia and accompanying geospatial analysis.</p>
Temporal and spatial variability of the stable isotopic composition of atmospheric molecular hydrogen: observations at six EUROHYDROS stations
<p>These are the H2 mixing ratio and deuterium content data used in: <br /> Batenburg, A. M., Walter, S., Pieterse, G., Levin, I., Schmidt, M., Jordan, A., Hammer, S., Yver, C., and Röckmann, T.: Temporal and spatial variability of the stable isotopic composition of atmospheric molecular hydrogen: observations at six EUROHYDROS stations, Atmos. Chem. Phys., 11, 6985-6999, doi:10.5194/acp-11-6985-2011, 2011,http://www.atmos-chem-phys.net/11/6985/2011/acp-11-6985-2011.html<br /> <br /> Please cite this ACP article when using these data in a publication, and kindly notify the first author (annekebatenburg'at'gmail.com).<br /> <br /> In the CSV files:<br /> - Mixing ratios are reduction gas analyzer results obtained at UHEI-IUP, MPI-BGC and LSCE.<br /> - dD(H2) data are obtained from analysis with the GC-IRMS system at the IMAU-APCG lab of Utrecht University. The estimated standard deviation/error in a single measurement is 4.5 permil, based on measurements of a laboratory working tank.<br /> - Outlier selection was based on visual inspection of the time series.<br /> - The "biased" or "downshifted" flag indicates dD measurements performed in a period where the dD results seemed to have a positive bias of approximately 9.5 permil. These samples were shown in the time series figure with the 9.5 permil subtracted, but excluded from the following quantitative analyses.<br /> - The last column indicates the number of succesfull repeat measurements of dD.<br /> <br /> More information can be found in the published, open-access article. Please do not hesitate to contact annekebatenburg'at'gmail.com if you have any questions.</p>
A decade (2008-2017) of water stable-isotope composition of precipitation at Concordia Station, East Antarctica
<p>A ten-year record of oxygen and hydrogen isotopic composition of precipitation is here presented: from 2008 to 2017, 1483 daily precipitation samples were collected all-year round on a raised platform at Concordia Station, East Antarctica.</p> <p>The dataset is discussed in the following pubblication</p> <p>Dreossi, G., Masiol, M., Stenni, B., Zannoni, D., Scarchilli, C., Ciardini, V., Casado, M., Landais, A., Werner, M., Cauquoin, A., Casasanta, G., Del Guasta, M., Posocco, V., and Barbante, C.: A decade (2008–2017) of water stable-isotope composition of precipitation at Concordia Station, East Antarctica, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-2813, 2023.</p>
Research data for Dissolved Cu isotope compositions in hydrothermal plumes
<p>Metadata inculdes the sample information, experiment data and Rayleigh distillation model data.</p>
Data for Triple Oxygen and Hydrogen Stable Isotope Composition of Water in Murchison Carbonaceous Chondrite
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Dataset of stable Strontium and Calcium isotopic compositions of multi-depth coastal aquifer of Sundarbans delta (version 1)
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The potential of seep carbonates to preserve the seawater isotope compositions
<p><span>Supplemental information present Supplementary Notes and Supplementary Tables. </span></p>
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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