Ostracode

Most ostracode carapaces measure 0.5-0.7 mm in length, which is usually their greatest dimension; however, a few attain a length of 30 mm. The carapace shows considerable …

A new ostracode fauna from the Permian-Triassic boundary in Turkey (Taurus, Antalya Nappes) Micropaleontology. Decoupling of morphological disparity and taxonomic diversity during the end-Permian mass extinction Paleobiology. Late Permian ostracodes: new subsurface material from Israel ...A myodocopid ostracode with preserved appendages from the Upper Jurassic of the Volga River region (USSR) Neues Jahrbuch für Geologie und Paläontolgie, Monatshefte, 1978 (7) (1978), pp. 393-399. Google Scholar. Eagar, 1969. S.H. Eagar. A Pleistocene mummified ostracod from the Wairarapa District.Thirty-six ostracode taxa were obtained from 202 discrete samples that were collected from the interval between 66.3 and 57.3 Ma. Near the K/Pg boundary, 8% (2 of 25) of the Maastrichtian taxa ...of 59 temperature-sensitive ostracode genera used to develop an ostracode transfer function in eleven Yorktown samples, are given in Table 3. The paleo- temperature history of the Rushmere, Morgarts Beach and Moore House Members based on results from 7 samples from localities 1 and 7, is plotted in Figure 3.Title: Distribution and diversity of ostracode assemblages from the Hamlin Shale and the Americus Limestone (Permian, Wolfcampian) in northeastern Kansas. Author(s): R. Michael Peterson, Roger L. Kaesler. Paleo Publication Type: KU Paleontological Contributions. Publication Format: Journal article. Year of publication:

Sourced from the Ethiopian highlands, the Omo River is the dominant inflow into this lake. We present individual ostracode valve analyses (IOVA) of δ 13 C and δ 18 O measurements (n = 329) of the extant benthic ostracode Sclerocypris clavularis from 17 sites spanning the entire lake (n avg = ∼19 specimens/site). We demonstrate that the ...Mg/Ca ratios in the shells of the ostracode genus Krithe have been calibrated to bottom water temperature (BWT) for the North Atlantic [Dwyer et al., 1995] and Arctic oceans [Cronin et al., 1996], and applied to Pliocene and late Quaternary deep-sea BWT reconstruction over orbital [Dwyer et al., 1995; Cronin et al., 2005b; Dwyer and Chandler ...On the identity of the ostracode genera Cypriconcha and Megalocypris. Can. J. Zool. 47: 271-281. CrossRef Google Scholar Diner, M. P., E. P. Odum & P. F. Hendrix, 1986. Comparison of the roles of Ostracods and Cladocerans in regulating community structure and metabolism in freshwater microcosms. Hydrobiologia 133: 59-63.Kornicker LS, Sohn IG (1971) Viabil ity of ostracode eggs egested by fish and effect of digestive flui ds on ostracode shells— ecologic and paleoecologic im plications.Garuda. Google Scholar. RAMA. Scopus Analysis. DNA barcode of seven species coral from Sepulu, Madura Island, Indonesia. Q3 as Journal Biodiversitas. Author Order : 1 of 7 Creator : Insafitri. 2023 2 cited. Marine tourism in gili labak island: Willingness to pay method as an effort to preserve coral reef in gili labak island, madura, Indonesia.This chapter provides an introduction to the class Ostracoda with a special reference to the freshwater ostracods of the world. Starting with the most recent classification of the group, a reader learns about these interesting crustaceans through the comparative morphology of their appendages, anatomy of the nervous, reproduction, and digestive systems, larval development, and biology ...At present, the westerly jet (WJ) path over East Asia may be a dominant factor determining the position of the EASM rain band (Liang and Wang, 1998, Sung et al., 2006, Sampe and Xie, 2010).Because of the topographic barrier of the Himalaya–Tibetan Plateau, the 500-hPa WJ axis passes to the south of the Himalayas in spring, and then jumps to …

δ 18O records of ostracode shells with the depth in the core QH-2000 are well consistent with those in core QH85-14B reported by Lister et al.[7]. 2.3 The climatic changes indicated by δ 18O values of ostracode shells in the core QH-2000 δ 18O records of authigenic and biogenic carbonates formed in ocean or lake are widely used to infer palaeo-The environment of Lake Issyk-Kul, Kyrgyzstan, has experienced significant changes since the early Holocene due to climate change. Two piston cores, IK97-10P and IK97-11P, were analyzed for ostracode abundance. These data were interpreted in light of the isotopic and trace element composition of the ostracode shells generated in a companion ...CLASS CRUSTACEA (SUBCLASS OSTRACODA) MORPHOLOGY Images taken from Howe, Kelsing, and Scott ,1961 and Scott, 1961 Some very basic ostracode morphology can be seen in the two images below. The image on the left shows the internal anatomy of a Recent ostracode. The image on the right displays some simple external features that may be present on the valves. Dangxiong Co is a salt lake located in the center of the Tibetan Plateau, China. We studied the petrology, mineralogy, geochemistry and microfossil assemblages in the Quaternary, first terrace of Dangxiong Co. Limnocytherellina was the most common ostracode in the first terrace and prefers warm-humid conditions. Grainy ankerite in the …The environment of Lake Issyk-Kul, Kyrgyzstan, has experienced significant changes since the early Holocene due to climate change. Two piston cores, IK97-10P and IK97-11P, were analyzed for ostracode abundance. These data were interpreted in light of the isotopic and trace element composition of the ostracode shells generated in a companion ...

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Freshwater ostracode, light micrograph. C058/4404. Rights Managed. 57.7 MB (1.6 MB compressed). 3888 x 5184 pixels. 33.0 x 43.9 cm · 13.0 x ...Synonyms for ostracode in Free Thesaurus. Antonyms for ostracode. 2 synonyms for ostracod: mussel shrimp, seed shrimp. What are synonyms for ostracode?Ostracods are by far the most complex organisms studied within the field of micropalaeontology. They are Metazoa and belong to the Phylum Arthropoda (as trilobites), Class Crustacea (as lobsters and crabs). An important distinguishing feature Ostracods share with other arthropods is the bilateral symmetry of their body form. Again, these are the two ways that the males and females can be different. The males can be bigger or the females can be bigger. We see both of these in both modern and fossil ostracode species. Some scientists have suggested that species for which the males are much bigger than the females might actually have a greater likelihood of going extinct.Ostracoderm, an archaic and informal term for a member of the group of armoured, jawless, fishlike vertebrates that emerged during the early part of the Paleozoic Era (542-251 million years ago). Ostracoderms include both extinct groups, such as the heterostracans and osteostracans, and living.

Actually, Cythere emarginata (in all probability referable to Tyrrhenocythere amnicola) was already reported by Moniez (Citation 1889) from River Anapo, this most likely being the very first mention of a Sicilian inland water ostracod.Troia et al. (Citation 2016) reported seven ostracod species from a wetland complex from western Sicily, among them the first …Ostracods, or ostracodes, are a class of the Crustacea (class Ostracoda), sometimes known as seed shrimp. Some 33,000 species (only 13,000 of which are extant) have been identified, grouped into 7 valid orders. They are small crustaceans, typically around 1 mm (0.04 in) in size, but varying from 0.2 to 30 … See moreOstracode Geochemical Record of Holocene Climatic Change and Implications for Vegetational Response in the Northwestern Alaska Range Volume 49, Issue 1 Feng Sheng Hu (a1) , Emi Ito (a1) , Linda B. Brubaker (a2) and Patricia M. Anderson (a2)Ostracode assemblages in Matsushima Bay had not yet recovered from the 2011 tsunami impact at the time of 20 months after the event. 6. Muddy deposits overlying the tsunami deposit contained organic-rich muds with high TOC content that were largely attributed to marine planktons. This is a large difference from the known on land 2011 …The ostracode assemblage, characteristic of freshwater bodies, is composed by the following species: Theriosynoecum pricei (Pinto & Sanguinetti, 1958), T. uninodosa (Pinto & Sanguinetti, 1958),Ostracod. Article Talk. Language; Watch · Edit. (Redirected from Ostracode). Ostracods, or ostracodes, are a class of the Crustacea (class Ostracoda), sometimes ...2.1 The Carapace and Associated Structures. The bivalved ostracod body (Figs. 1(1) and 2(2)) is covered by a continuous cuticle secreted by the two lateral folds of epidermis (Fig. 1(3)), called the duplicatures (flap-like outgrowths) which with growth become hardened, leaving only few parts (the joints) uncovered to allow for movement. The …Four ostracode assemblages are recognized from these canals suggesting periods of salination and dilution of the canal waters. Anthropogenic disturbance appears to be the major factor affecting ostracode occurrence in all canals. However, weak climatic signatures are also recorded suggesting that canal operation took place mostly during the ...«Ostracode» Ostracods, or ostracodes, are a class of the Crustacea, sometimes known as seed shrimp. Some 70,000 species have been identified, grouped into ...Our results suggest that there was a major ostracode faunal turnover during the global climate transitions known as the Mid-Pleistocene Transition (MPT, ~ 1.2 to 0.7 Ma) and the Mid-Brunhes Event (MBE, ~ 400 ka) reflecting the development of perennial sea ice during interglacial periods and large ice shelves during glacial periods over the …Ostracode biostratigaphy were investigated in detail from three formations (Shiranish, Hartha and Mushorah ) in subsurface sections of four boreholes Northwest and centre of Iraq. On the basis of the ostracode species distribution, the studied formations were divided into four ostracode biozones as follows: Biozone 1: Cytherella IRC 22 Interval zone.

New ostracode genera from the Lower Devonian McMonnigal Limestone of central Nevada - Volume 60 Issue 2

The "Bradleya problem" is concerned with the discovery and definition of a group of fossil and Recent reticulate ostracodes, several of which are common to Cenozoic deep-sea sediments in many parts of the world ocean floor.These species have often been misunderstood and taxonomically confused with genera characteristic of the study of shallow-water forms.Silicified ostracods of lower Tuvalian, Late Carnian age ( Spongotortilispinus moixi radiolarian Zone) have been extracted from the sample G11 of the Tavusçayiri Block in the Mersin Mélange located in southern Turkey. This sample previously provided the best-preserved and most diverse radiolarian fauna of that age worldwide.Population ecology and shell chemistry were studied in the phytal ostracode Loxoconcha matagordensis (Swain 1955) collected from Zostera marina seagrass beds in the Chesapeake Bay to provide seasonal constraints on shell secretion time for paleothermometry. Population density and age structure were defined by two main breeding cycles that occurred between 01 to 15 June and 02 to 16 August 2001.Cyprideis torosa is a species of ostracode that inhabits a wide range of aquatic habitats in which its low Alk/Ca requirement is met. Its fossil remains are widely used in palaeoecological studies of coastal environments and inland salt lakes. We collected C. torosa from 20 water bodies near Valencia, Spain. Temperature, chlorophyll a ...Calcitic valves of non-marine ostracodes are important geochemical archives. Investigations of the relationship between the ranges of oxygen and carbon isotope values of modern ostracode populations and their host water provide important information on local or regional conditions and influences. Here we present the first δ18Oostracode and δ13C of the freshwater ostracode species ...Eighty-one ostracode taxa were identified in 81 samples. Changes in ostracode faunas in space and time provide information that enabled us to reconstruct a detailed paleobiogeography of the Bay. Ostracode migrations and faunal changes concomitant with sea-level changes and the opening of straits could be clearly identified on paleogeographical ...A sediment core from Hulun Lake, Inner Mongolia was analyzed for species assemblages and shell chemistry of ostracodes to investigate changes in the hydrology and climate of the East Asian summer monsoon margin during the Holocene.

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The ostracode assemblages and δ18O values in ostracode valve calcite from the lacustrine northern Bouse Formation and contested southern Bouse Formation were studied and compared to determine ...Microcheilinella, a new name for the ostracode genus Microcheilus. Journal of Paleontology 7, 112.Google Scholar. Göncüoğlu, M. C. 1997. Distribution of Lower Paleozoic Units in the Alpine Terranes of Turkey: paleogeographic constrains.The online version contains supplementary material available at 10.1007/s10533-022-00917-9.Ostracode vivant d’environ 0,6 mm de longueur, appartenant au genre Anchistrocheles Brady & Norman, 1889, collecté au large des côtes du Japon Hayato Tanaka, Author providedA previously unreported ostracode fauna is described from the Bangor Limestone in Franklin, Lawrence, and Colbert Counties, Alabama. The Bangor formation is a Chesterian (Mississippian) platformal carbonate sequence. The predominant carbonates are bioclastic and oolitic grainstones to wackestones with less abundant micritic claystones.Abstract. Ostracodes are bivalved Crustacea whose fossil shells constitute the most abundant and diverse metazoan group preserved in sediment cores from deep and intermediate ocean water depths. The ecology, zoogeography, and shell chemistry of many ostracode taxa makes them useful for paleoceanographic research on topics ranging from deep ...Palaeocopida Henningsmoen, 1953. Platycopida Sars, 1866. Podocopida Sars, 1866. Ostracods, or ostracodes, are a class of the Crustacea (class Ostracoda ), sometimes known as seed shrimp. Some 33,000 species (only 13,000 of which are extant) have been identified, [2] grouped into 7 valid orders. [2] They are small crustaceans, typically around 1 ...May 3, 2023 · ostracod: [noun] any of a subclass (Ostracoda) of very small aquatic crustaceans that have the body enclosed in a bivalve carapace, the body segmentation obscured, the abdomen rudimentary, and only seven pairs of appendages. The fields also offer a way of describing ostracode occurrences in terms of hydrogeology and climate.If ostracode occurrences are limited by major chemical and physical properties of the aquatic environment, then their habitat may be defined by certain physical-chemical principles. The same physical-chemical principles must apply to the past.Ostracodes are small bivalved crustaceans, known from an estimated 33,000 living and extinct marine, nonmarine, and even terrestrial species (1). They are by ...The δ 18O records of ostracode shells in sediments of core QH-2000 from Qinghai Lake can be used as a better proxy to reflect monsoon changes. Low monsoon precipitation between 17.5 and 11 cal. ka BP is indicated by positive δ 18O values averaging 2.37‰. A fast shift in δ 18O from positive at 11 cal. ka BP to negative at 10 cal. ka BP indicates sharp increase of monsoon precipitation. An ... This study encompasses micropaleontological and mineralogical research conducted in the Neogene cover deposits of the Thrace Basin, within the Çelebi and Sinanlı members of the Ergene Formation. The chronostratigraphic, paleoenvironmental, and paleobiogeographic features of the two members of this formation are studied in detail. Ostracod genera and species were found out, and those were ... ….

Maksud ostracode dalam kamus Corsica dengan contoh kegunaan. Sinonim ostracode dan terjemahan ostracode ke dalam 25 bahasa.Although the living ostracode abundance is based on 10 cc. samples, 10 grains of this sample were used to arrive at estimates ol dead ostracode abundance. This was done so that the results of this investigation could be used more readily in making future com- parisons with ostracode abundance in ancient lilhilied sediment. As the sediment param-This ostracode fauna of a single limestone bed yields 32 taxa and is compared with the less-diversified ostracode fauna from an adjacent parallel section Hassi Mouf South as well as with a ...Ostracode community composition of springs differed from all other sampled habitats, which was also reflected in CCA analyses. Our data indicated that the ostracode fauna of western Mongolia shows a high response to calcium content, alkalinity, salinity, temperature, nutrients, and altitude. Species composition and diversity seem to be ...Forty ostracode species were identified, yet 19 of them are kept in open nomenclature due to either the absence of adult individuals or poor preservation. Thirteen of those species have been ...We postulate that the signaling clade has undergone rapid evolution driven by sexual selection particularly in Photeros Cohen and Morin, the only ostracode with both species-specific mating displays and clear species-specific morphological characters in the large male copulatory (eighth) limbs for each species (see also Morin and Cohen, 2010).Measurements of the Ca, Sr, and Mg contents of individual calcitic shells of non-marine ostracods and their host waters, both in lakes and controlled aquaria, permit the calculation of the distribution coefficients of Sr/Ca and Mg/Ca partitioning in ostracod shells. We report new KD[Sr] for seven genera of non-marine ostracods and KD[Mg] for Cyprideis at 25°C.Strontium partitioning is ...Two ostracode species were identified in the Três Barras Farm section: Harpabollia harparum (Troedsson, 1918) and Satiellina paranaensis Adôrno and Salas in Adôrno et al., 2016 were recovered ...The Bradleya problem, with descriptions of two new psychrospheric ostracode genera, Agrenocythere and Poseidonamicus (Ostracoda: Crustacea). Smithsonian Contrib. Paleobiol. 12: 1 - 138.Google Scholar Ostracode, Modern ostracode faunal distributions within marginal marine to abyssal environments often correlate to various environmental parameters (e.g., temperature and salinity), and these relationships are conveyable to fossil assemblages assuming taxonomic uniformitarianism. The carbonate valves of ostracodes provide excellent material for oxygen ..., Ostracods are by far the most complex organisms studied within the field of micropalaeontology. They are Metazoa and belong to the Phylum Arthropoda (as trilobites), Class Crustacea (as lobsters and crabs). An important distinguishing feature Ostracods share with other arthropods is the bilateral symmetry of their body form., The "Bradleya problem" is concerned with the discovery and definition of a group of fossil and Recent reticulate ostracodes, several of which are common to Cenozoic deep-sea sediments in many parts of the world ocean floor.These species have often been misunderstood and taxonomically confused with genera characteristic of the study of shallow-water forms., Abstract and Figures. An exceptionally well-preserved ostracode from the Silurian of Herefordshire, United Kingdom, provides a rare view of the fossilized soft-part anatomy of this important group ..., Holocene is the name for the most recent interval of Earth history and includes the present day. Although generally regarded as having begun 10,000 radiocarbon (14 C) years, or the last 11,500 calibrated (i.e., calendar) years, BP (i.e., 1950), the base of the Holocene is now assigned an age of 11,700 years b2k (before CE 2000) as described ..., There are an estimated 33,000 described living and extinct ostracode species divided into two subclasses, the Myodocopa and Podocopa, and 10 orders distinguished from one another on the basis of appendages and carapace features such as size, shape, muscle scar pattern, pore patterns, and hinge structure. Many Myodocopids are pelagic in habitat ..., At present, the westerly jet (WJ) path over East Asia may be a dominant factor determining the position of the EASM rain band (Liang and Wang, 1998, Sung et al., 2006, Sampe and Xie, 2010).Because of the topographic barrier of the Himalaya–Tibetan Plateau, the 500-hPa WJ axis passes to the south of the Himalayas in spring, and then jumps to …, Nov 15, 2022 ... Multi-parametric analyses, based on biological data, revealed that ostracode species associations represent disjunct faunas. Five species ..., DELEO AND BRACKE N-GRISSOM | 3 acting on emission spectra over time may have allowed for the uncoupling of max λ and light decay in modern lineages of Photeros in contrast to their ancestors. In this sense, phenotypic diversifi-, Fresh-water ostracodes from eight different sites on the San Francisco Peninsula were sampled periodically between May 1989 and May 1990. Seasonal variations in the relative abundances of ostracode species were observed. Those changes are believed to have been due, at least in part, to seasonal changes in water and sediment temperatures., In this week's issue of Science, a team describes a fossil crustacean and suggests that its descendents have had essentially unchanged anatomy for a record-breaking 425 million years. Ostracodes are tiny crustaceans with a clamlike carapace. Fossil ostracode shells are so common and so varied that geologists use them to date and …, The recorded ostracode fauna and associated foraminifera reflect deposition in a coastal to inner neritic envi-ronment. Many of the recorded taxa have a wide geographic distribution throughout the ..., ostracod: [noun] any of a subclass (Ostracoda) of very small aquatic crustaceans that have the body enclosed in a bivalve carapace, the body segmentation obscured, the abdomen rudimentary, and only seven pairs of appendages., We reconstructed three time series of last glacial-to-present deep-sea temperature from deep and intermediate water sediment cores from the western North Atlantic using Mg/Ca ratios of benthic ostracode shells. Although the Mg/Ca data show considerable variability ("scatter") that is common to single-shell chemical analyses, comparisons between cores, between core top shells and modern ..., Middle Pliocene marine ostracodes from coastal and shelf deposits of North and Central America and Iceland were studied to reconstruct paleotemperatures of shelf waters bordering portions of the Western Boundary Current System (including the Gulf Loop Current, Florida Current, Gulf Stream and North Atlantic Drift)., The taxonomic status of the Lower Cretaceous non-marine ostracode genera Hourcqia Krömmelbein and Pattersoncypris Bate is discussed. From a detailed analysis of the type species of these genera, and several other species attributed to them, it was possible to conclude that both genera are invalid., Ten ostracode biofacies define a sediment core retrieved from LP, which reveal progressive changes in aquatic environments that varied in salinity, depth, and proximity to deltas over the late Pleistocene. Closed lakes occupied the basin from ~ 37.6-30.7 ka, ~ 28.0-25.0 ka, and ~ 23.0-16.6 ka, whereas saline wetlands occurred when these lakes ..., De la Viquipèdia, l'enciclopèdia lliure. Els ostracodesostràcodes [1] (Ostracoda), nom que deriva del mot óstrakon, que significa 'closca', són una dins Crustacea. Se n'han identificat unes 65.000 espècies en total (13.000 existents en l'actualitat), [2] agrupades dins diversos ordres. Morfologia. Cyamocytheridea sp. a Nederokkerzeel (., The ostracode wackestone was deposited in a low-energy, marginal- marine environment. A thin sequence (<1 m thick) of interbedded laminated limestone and, Seventy-three ostracode species from 38 genera were recovered from the 55 surface sediment samples in Lützow-Holm Bay, northeastern Antarctica. We investigated bathymetric and geographic distributions of modern benthic ostracode species in the bay and compared this fauna with published modern and fossil ostracode data of Antarctic and southern South American regions., Composition of the ostracode biofacies parallels the distinct megafaunal assemblages ascribed by Boardman et al (1983) to changing oxygen concentrations, water depths, and salinity. Black, organic-rich, noncalcareous, fissile shales occur near the base of the Finis. This lithofacies is barren of ostracodes and megafauna, and is interpreted to ..., The earliest freshwater ostracode species came from coal-forming swamps, ponds, and streams of early Pennsylvanian age (Benson, 1961). According to Moore (1961), the Podocopina evolved from Podocopida stock during the Ordovician period, and then branched out into the Cytheroidea and the Cypridoidea during the Devonian period (Maddocks, 1982)., Late Quaternary paleoceanographic changes at the Lomonosov Ridge, central Arctic Ocean, were reconstructed from a multicore and gravity core recovered during the 2014 SWERUS-C3 Expedition. Ostracode assemblages dated by accelerator mass spectrometry (AMS) indicate changing sea-ice conditions and warm Atlantic Water (AW)inflow to the Arctic Ocean from ∼50 ka to present., ostracod ( plural ostracods ) Any of many small crustaceans, of the class Ostracoda, that resemble a shrimp enclosed in a bivalve shell. 1990, Anne Van Frausum, Karel Wouters, “39: Ostracoda from Holocene calcareous tufa deposits in southern Belgium: a palaeoenvironmental analysis”, in R. Whatley, C. Maybury, editors, Ostracoda and Global ..., The Arctic Ostracode Database provides species census data for about 100 species of benthic marine Ostracoda from modern surface and late Quaternary sediments from various parts of the Arctic Ocean and adjacent seas. Ostracodes are a microfossil group of bivalved Crustacea that secrete a calcareous shell commonly preserved in sediments in the ..., Morphometric analyses illustrate how such variability is not related to geographic distance but to environmental conditions. Finally, patterns of temporal change in morphological diversity of a widely distributed ostracode group, the Candoninae, are elucidated by using the B-splines method combined with multivariate statistical analysis., The Ostracoda (Crustacea; Class Ostracoda) is a diverse, frequently abundant, and ecologically important component of the marine zooplankton assemblage. There are more than 200 described species of marine planktonic ostracods, many of which (especially conspecific species) can be identified only by microscopic examination and dissection of fragile morphological characters. Given the complexity ..., scribed ostracode species (Roth, 1933; Harper and Sutton, 1935) and the newly described species, with the possible exception of those from Wyoming, are from the Chilson Member of the Lakota Formation. The Mesozoic nonmarine species previously re­ ferred to Bythocypris (Bairdiocypris) are rede-, A North American Combined Ostracode Database (NACODe) is introduced, comprising ostracod occurrence, environmental and climatic data from Canada (Delorme Database, 6719 sites) and the United States (North American Non-Marine Ostracode Database, 609 sites). NACODe's ostracod data are binary (present/not present) and include 108 species with three or more occurrences, from 34 genera., Late Quaternary paleoceanographic changes at the Lomonosov Ridge, central Arctic Ocean, were reconstructed from a multicore and gravity core recovered during the 2014 SWERUS-C3 Expedition. Ostracode assemblages dated by accelerator mass spectrometry (AMS) indicate changing sea-ice conditions and warm Atlantic Water (AW)inflow to the Arctic Ocean from ∼50 ka to present., ostracod ( plural ostracods ) Any of many small crustaceans, of the class Ostracoda, that resemble a shrimp enclosed in a bivalve shell. 1990, Anne Van Frausum, Karel Wouters, "39: Ostracoda from Holocene calcareous tufa deposits in southern Belgium: a palaeoenvironmental analysis", in R. Whatley, C. Maybury, editors, Ostracoda and Global ..., Ostracode assemblages were examined, and the grain size and chemistry of sediments were analyzed with the aim of clarifying paleoenvironmental and relative sea-level (RSL) changes relating to ..., Nov 9, 2015 · Ostracode faunas changed in Lake Bonneville as the lake rose in the closed basin and became more dilute, then overflowed, and eventually returned to closed-basin hydrology; alkalinity (carbonate + bicarbonate) increased throughout the lake history. Fossil-ostracode faunas in marl deposited in the lake between about 30 and 13 cal ka allow reconstruction of these geochemical changes (as shown by ...