Relevant bibliographies by topics / Ostracod calcite

Academic literature on the topic 'Ostracod calcite'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Ostracod calcite"

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Meyer, Juliane, Claudia Wrozyna, Albrecht Leis, and Werner E. Piller. "Modeling calcification periods of <i>Cytheridella ilosvayi</i> from Florida based on isotopic signatures and hydrological data." Biogeosciences 14, no. 21 (November 7, 2017): 4927–47. http://dx.doi.org/10.5194/bg-14-4927-2017.

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Abstract. The isotopic signatures of ostracod shells are the result of the temperature and composition of their host water and the phenology and ecology of the target species. Investigations addressing the influence of site-specific environmental variations on the isotopic ranges of ostracod shells are still rare but can provide important information on habitat-dependent variations and may signify a seasonally restricted timing of calcification periods. Here we present isotopic signatures (δ18Oostr, δ13Costr) of living Cytheridella ilosvayi (Ostracoda) and physical, chemical, and isotopic (δD, δ18Owater, δ13CDIC) compositions of 14 freshwater habitats (rivers, lakes, canals, marshes, sinkholes) in South Florida from winter 2013 and summer 2014. We also present instrumental data of river temperatures and δ18O of precipitation (δ18Oprec) from this region. The physicochemical and isotopic compositions of the selected sites characterize the different habitats and show the influence of the source water, biological activity, and duration of exposure to the surface. Mean δ18Oostr and δ13Costr signatures of C. ilosvayi shells correlate well with the isotopic composition of their host waters. Within-sample variabilities in repeated isotopic measurements of single ostracod shells reflect habitat-dependent ranges. The similarly high range of ostracod δ18O in rivers and one marsh sample indicates that both temperature and δ18Oprec are responsible for their variation in the whole study area. Rivers and canals, which are predominantly influenced by the input and mixing of inorganic carbon from the catchment, show smaller δ13Costr ranges than the marsh dominated by local fluctuations in biological activities. Based on these observations, background data of water temperatures and δ18Oprec were used to calculate monthly δ18O variations in a theoretical calcite formed in rivers in Florida assuming a direct reaction on precipitation changes. The calculated values showed a high variation coupled with low mean values during the summer wet season, while during the winter dry season the variation remains small and mean values increased. Inferred configurations were used to approximate possible calcification periods of C. ilosvayi. For a plausible calcification period, mean values and ranges of δ18Oostr had to be equal to the theoretical calcite with a slight positive offset (vital effect). The applied model suggests a seasonal calcification period of C. ilosvayi in early spring that is probably coupled to the hydrologic cycle of Florida.
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Wansard, Guy, Josep R. Roca, and Francesc Mezquita. "Experimental determination of strontium and magnesium partitioning in calcite of the freshwater ostracod Herpetocypris intermedia." Fundamental and Applied Limnology 145, no. 2 (May 27, 1999): 237–53. http://dx.doi.org/10.1127/archiv-hydrobiol/145/1999/237.

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Bornemann, André, Claudius M. Pirkenseer, Patrick De Deckker, and Robert P. Speijer. "Oxygen and carbon isotope fractionation of marine ostracod calcite from the eastern Mediterranean Sea." Chemical Geology 310-311 (June 2012): 114–25. http://dx.doi.org/10.1016/j.chemgeo.2012.03.028.

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Bodergat, Anne-Marie, Christophe Lécuyer, François Martineau, Atike Nazik, Kemal Gürbüz, and Serge Legendre. "Oxygen isotope variability in calcite shells of the ostracod Cyprideis torosa in Akyatan Lagoon, Turkey." Journal of Paleolimnology 52, no. 1-2 (April 23, 2014): 43–59. http://dx.doi.org/10.1007/s10933-014-9777-3.

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Devriendt, Laurent S., Helen V. McGregor, and Allan R. Chivas. "Ostracod calcite records the 18O/16O ratio of the bicarbonate and carbonate ions in water." Geochimica et Cosmochimica Acta 214 (October 2017): 30–50. http://dx.doi.org/10.1016/j.gca.2017.06.044.

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Börner, Nicole, Bart De Baere, Roger Francois, and Antje Schwalb. "Application of flow-through time-resolved analysis (FT-TRA) to isolate the elemental composition in ostracod calcite." Chemical Geology 467 (September 2017): 53–63. http://dx.doi.org/10.1016/j.chemgeo.2017.07.019.

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Silva, Loreine Hermida da Silva e., Anderson Andrade Cavalcanti Iespa, and Cynthia Moreira Damazio Iespa. "Composição dos estromatólitos estratiformes da lagoa Salgada, Rio de Janeiro, Brasil." Anuário do Instituto de Geociências 31, no. 2 (December 1, 2008): 42–49. http://dx.doi.org/10.11137/2008_2_42-49.

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Lagoa Salgada is situated in the north coast of State of Rio de Janeiro, between the districts of Campos dos Goitacazes and São João da Barra, some 41º00'30" W and 21º54'10"S. In the margins of the lagoon the presence of recent stromatolitic constructions was verified. The stromatolite may be defined as lithifying biosedimentary structure, growing through of sediment blade trapping by the carbonate precipitation as result of microbian organism activity. The aim of this study was to characterize the cyanobacteria assemblage in stratiform stromatolites found on the floor of lagoa Salgada. Within the stratiform stromatolites 21 species of cyanobacteria were found, Microcoleus chthonoplastes (Thuret) Gomont 1892 and Lyngbya aestuarii (Liebman) Gomont 1892 are frequent in these stromatolites. The presence of calcite was observed in the stratiform stromatolites. The filamentous cyanobacteria are responsible for the union and imprisonment of sediment to form the layers in the stromatolites. The skeleton remains of mollusks, foraminifers and ostracod found in the area, work as a source of calcium carbonate and of sediment to structure the stromatolites
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Lawrence, James R., Kiseong Hyeong, Rosalie F. Maddocks, and Kwang-Sik Lee. "Passage of Tropical Storm Allison (2001) over southeast Texas recorded in δ18O values of Ostracoda." Quaternary Research 70, no. 2 (September 2008): 339–42. http://dx.doi.org/10.1016/j.yqres.2008.04.004.

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AbstractFreshwater Ostracoda collected in ephemeral pond-waters derived from Tropical Storm Allison (2001, Texas) recorded the unusually low oxygen-isotope values of that storm. Therefore, the potential clearly exists, in locations where tropical cyclones make landfall, to obtain a long-term record of tropical cyclone activity from fossil ostracode calcite.
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Wetterich, Sebastian, Ulrike Herzschuh, Hanno Meyer, Lyudmila Pestryakova, Birgit Plessen, C. M. Larry Lopez, and Lutz Schirrmeister. "Evaporation effects as reflected in freshwaters and ostracod calcite from modern environments in Central and Northeast Yakutia (East Siberia, Russia)." Hydrobiologia 614, no. 1 (July 2, 2008): 171–95. http://dx.doi.org/10.1007/s10750-008-9505-y.

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Schultze, Hans-Peter, Christopher G. Maples, and Christopher R. Cunningham. "The Hamilton Konservat-Lagerstätte: Stephanian terrestrial biota in a marginal-marine setting." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 84, no. 3-4 (1993): 443–51. http://dx.doi.org/10.1017/s0263593300006246.

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ABSTRACTThe Stephanian Konservat-Lagerstätte of Hamilton, Kansas, deposited in a marine-estuarine environment preserves a mixture of terrestrial, fresh-water, and marine fossil organisms. The marine component is the most diverse taxonomically, whereas one ostracod species, commonly interpreted as a fresh-water form, together with vascular plant debris dominates volumetrically. Well-preserved terrestrial and aquatic vertebrates and arthropods were embedded in rapidly deposited calcareous mud conducive to microbial early-diagenesis of vertebrate soft tissues in a tidal estuarine setting. Many vertebrate fossils show no evidence of preburial decay or disarticulation. Dark-coloured body silhouettes (‘skin preservation’) are composed of calcitic bacteria, calcite crystals and organic material, and have been interpreted to reflect preservation under saline conditions. The aquatic vertebrates had a broader tolerance of salinity than today. The fishes were perhaps migratory (anadromous or catadromous), and some used the estuarine environment for spawning. The tetrapods (dissorophid amphibians) retained their tolerance to salinity from their marine ancestors and were able to spawn in near-shore environments. The terrestrial biota was dominated by the conifer Walchia and was subjected to forest fires, as evidenced by preserved charcoal fragments.
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Dissertations / Theses on the topic "Ostracod calcite"

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Yahiaoui, Abdelouahab. "La partie inférieure de la série marno-calcaire du crétacé supérieur (cénomanien supérieur à coniacien inférieur) entre Batna et El Kantara (Algérie orientale) : stratigraphie, sédimentologie et paléogéographie." Nancy 1, 1990. http://www.theses.fr/1990NAN10047.

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La région située entre Batna au Nord et El Kantara au Sud couvre deux domaines paléogéographiques et structuraux : le préatlasique (Monts de Bellzma-Batna) et l'Atlasique (Monts de l'Aurès) en bordure de la plate-forme saharienne. Six formations nouvelles sont définies dans un ensemble de 1000 m d'épaisseur ; elles sont datées par les ammonites, les foraminifères pélagiques et benthiques, les ostracodes et les algues. Les milieux de dépôt appartiennent à une plate-forme sur laquelle, de l'extérieur vers l'intérieur, se succèdent trois environnements majeurs : 1) une plate-forme ouverte aux eaux calmes de milieu infratidal ; 2) une plate-forme moyenne avec localement des constructions récifales à rudistes et à polypiers, de milieu infratidal moyen à supérieur peu ouvert et 3) une plate-forme restreinte, avec quelques évaporites s'étendant à l'infratidal à l'intertidal élevé. Au cénomanien supérieur - turonien inférieur, la sédimentation carbonatée signe le maximum de la transgression sur une rampe carbonatée à faible pendage au NE et à l'E. Dès le turonien moyen, avec le rejeu synsédimentaire de failles N110#O, certains compartiments vont fonctionner en haut-fond et le mouvement des blocs est facilité par les diapyrs triasiques. Pendant le turonien supérieur et le conianien basal, s'opère une homogénéisation des facies résultant de l'action simultanée de la subsidence et de la sédimentation active qui se termine par l'installation des récifs à vaccinités. Enfin durant le coniacien inférieur et moyen, un régime marin franc marque la disparition momentanée du régime de plate-forme
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Dean, C. E. "Lake carbonate geochemistry as a proxy for paleohydrology: a validation-in-time at West Basin Lake, Victoria." Thesis, 2019. https://hdl.handle.net/2440/136950.

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There is a lack of extensive historical climate data in Australia, meaning high-resolution paleoclimate studies are essential for a more comprehensive understanding of natural climate variability. The majority of paleohydrology records in south-eastern Australia region are low resolution, millennial time-scale reconstructions, resulting in a lack of understanding of climate variability at shorter time-scales relevant to human life spans. Here, we attempt to validate the use of geochemical analysis of lake sediments from West Basin, Victoria, as a way to create a high resolution paleohydrology reconstruction. The isotopic composition of the lake water in West Basin is primarily controlled by the precipitation to evaporation ratio (P:E). Ostracod calcite and bulk inorganic carbonates (BIC) that form within the water column reflect these changes and thus are used as proxies of past changes in P:E. This reconstruction is supported by a 210Pb- and 240/230Pu-based chronology which estimates a sediment accumulation rate of 0.3 to 0.4 cm/year and a maximum age at 40 cm of 118 years. This enables the resulting oxygen and carbon profiles to be validated against instrumental records of annual rainfall and temperature. The oxygen profile exhibits good agreement with this climate record, with peaks in δ18O values often coinciding with periods of low annual rainfall. Based on this, the ostracod record was determined to be capable of recording reliable, high resolution changes in P:E. The BIC record, though less consistent, can produce a detailed profile where ostracods are unavailable. Studies of this kind are vital to improving the accuracy of proxy system models which allow for reconstructions to be extended further in the geological record. Such models would allow for contextual understanding of the severity of drought occurrences and the assessment of the possible impacts of human induced climate change.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2019
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Book chapters on the topic "Ostracod calcite"

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Schram, Frederick R., and Stefan Koenemann. "Ostracoda." In Evolution and Phylogeny of Pancrustacea, 119–40. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780195365764.003.0010.

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The diagnostic features that characterize Ostracoda, or seed shrimp, include distinctness of each pair of limbs from each other, body displaying little or no segmentation (although individual taxa can exhibit sclerite features that suggest possibly up to 11 trunk somites), an all-encompassing bivalved shell that lacks growth lines, and location of an adult male copulatory limb or organ just anterior to the caudal rami. The World Ostracoda Database indicates approximately 34,660 accepted species. The shell is typically calcareous, but in purely planktonic forms, calcium carbonate can be all but absent. The shell is often linked with a carapace, but this is not necessarily homolous with other pancrustacean carapaces. Once thought to be polyphyletic, the consensus, supported by molecule sequences, leans toward monophyly. The expression of the engrailed gene in Vargula hilgendorfii has allowed limb identifications. Initial hatching can happen at a variety of larval stages: three-segment nauplii, four-segment head larvae, or even longer segmental stages. Ostracods definitely occur in the Ordovician, but fossilized, ostracod-like limb fragments occur in the Cambrian. Sequencing of ostracods has helped reform the modern understanding of crustaceomorph evolution and taxonomy.
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Dettman, David L., and Gary S. Dwyer. "The Calibration of Environmental Controls on Elemental Ratios in Ostracod Shell Calcite." In Ostracoda as Proxies for Quaternary Climate Change, 145–63. Elsevier, 2012. http://dx.doi.org/10.1016/b978-0-444-53636-5.00009-3.

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Corrège, T. "Preliminary Results of Paleotemperature Reconstruction Using the Magnesium to Calcium Ratio of Deep-Sea Ostracode Shells from the Late Quaternary of Site 822, Leg 133 (Western Coral Sea)." In Proceedings of the Ocean Drilling Program. Ocean Drilling Program, 1993. http://dx.doi.org/10.2973/odp.proc.sr.133.222.1993.

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