Consulta: subjectFacets:"Foraminifera"
Registros recuperados: 66
Data/hora: 17/06/2024 07:36:14

Climatic cycles as expressed in sediments of the PROMESS1 borehole PRAD1-2, central Adriatic, for the last 370 ka: 1. Integrated stratigraphy - art. no. Q01R01
Provedor de dados: 5
Autores: Piva, A; Asioli, A; Schneider, R; Trincardi, F; Andersen, N; Colmenero Hidalgo, E; Dennielou, Bernard; Flores, J; Vigliotti, L.
[1] A multiproxy integrated chronological framework, based on oxygen and carbon stable isotope stratigraphy, biostratigraphy (foraminifera and nannoplankton bioevents and foraminifer assemblage-based climate cyclicity), magnetostratigraphy, sapropel stratigraphy, and C-14 AMS radiometric dates, has been achieved for borehole PRAD1-2, collected in 185.5 m water depth in the central Adriatic. This work was carried out within the European Community project Profiles across Mediterranean Sedimentary Systems (PROMESS1). The 71.2 m long borehole spans a time interval between late MIS 11 and MIS 1 (the last 370 ka), showing a chronological resolution of 500 and 250 years per cm during interglacial and glacial intervals, respectively. At present, this record is the...
Tipo: Text
Palavras-chave: Sapropel stratigraphy; Adriatic Sea; D O events; Foraminifera; Oxygen isotope stratigraphy; Late Quaternary.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3605.pdf

Living (stained) benthic foraminifera from the Mozambique Channel (eastern Africa): Exploring ecology of deep-sea unicellular meiofauna
Provedor de dados: 5
Autores: Fontanier, Christophe; Garnier, Eline; Brandily, Christophe; Dennielou, Bernard; Bichon, S.; Gayet, Nicolas; Eugene, Thibaut; Rovere, Mickael; Gremare, A.; Deflandre, B.
Live (Rose-Bengal stained) deep-sea foraminiferal faunas have been studied at four stations between 530–3200-m depth in the Mozambique Channel (eastern Africa) to understand how complex environmental conditions (e.g., organic matter, oxygenation) control their ecological structure (i.e., diversity, density, and microhabitats). Two upper-slope stations, located at 530- and 780-m depth off Madagascar, are bathed by well-oxygenated bottom waters. They are characterized by fine sediments enriched in highly degraded organic matter (low amino-acid bio-availability and reduced chlorophyllic freshness). Mineralization of organic compounds results in relatively moderate oxygen penetration depth (i.e., 15 and 30 mm) in sediment. Interestingly, foraminiferal species...
Tipo: Text
Palavras-chave: Mozambique Channel; Foraminifera; Diversity; Microhabitat; Organic matter.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00344/45505/45057.pdf

Hydrological changes in the Mediterranean Sea over the last 30,000 years
Provedor de dados: 5
Autores: Essallami, L.; Sicre, M. A.; Kallel, N.; Labeyrie, L.; Siani, G.
Sea surface temperatures were reconstructed over the last 30,000 years from alkenone paleothermometry (SST-(alk)) and planktonic foraminifera assemblages using the Modern Analog Technique (MAT) (SST-(foram)) along two cores of the Mediterranean Sea: MD84-632 (Levantine basin) and MD04-2797 (Siculo-Tunisian Strait). Oxygen isotope of planktonic foraminifera G. bulloides for core MD04-2797 and G. ruber for core MD84-632 were also determined. SST-alk in the Levantine basin indicate colder values at the Last Glacial Maximum (LGM) (similar to 14 degrees C) than earlier established from MAT, and a cooling amplitude of 6 degrees-7 degrees C, comparable to the central Mediterranean Sea. Climatic events such as the Younger Dryas (YD) and Heinrich events 1 and 2 (H1...
Tipo: Text
Palavras-chave: Paleoclimate; Glacial; Mediterranean; Alkenones; Foraminifera; Marine core.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00208/31954/30378.pdf

Levantine intermediate water hydrodynamic and bottom water ventilation in the northern Tyrrhenian Sea over the past 56,000 years: New insights from benthic foraminifera and ostracods
Provedor de dados: 5
Autores: Minto'O, Charlie Morelle Angue; Bassetti, Maria-angela; Morigi, Caterina; Ducassou, Emmanuelle; Toucanne, Samuel; Jouet, Gwenael; Mulder, Thierry.
Foraminifera and ostracods have been quantitatively studied in core MD01-2472, from the upper continental slope (at water depth of 501 m), to evaluate their relationship with bottom water condition variability and decipher the control of the Levantine Intermediate Water (LIW) current on benthic faunas. The occurrence of reworked ostracod species (originating from the continental shelf) and, the presence of shallow water Elphidium/Ammonia benthic foraminifera are used to estimate the degree of along-slope transport at the core site. This has revealed two intervals of along-slope transport also associated with coarse-grained contourite deposits, deposited during the YD and HS2 episodes. Planktonic-benthic foraminiferal and ostracod assemblages reflect...
Tipo: Text
Palavras-chave: Ostracods; Foraminifera; LIW; Corsica margin.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00245/35648/34208.pdf

Heterotrophic Foraminifera Capable of Inorganic Nitrogen Assimilation
Provedor de dados: 5
Autores: Bird, Clare; Lekieffre, Charlotte; Jauffrais, Thierry; Meibom, Anders; Geslin, Emmanuelle; Filipsson, Helena L.; Maire, Olivier; Russell, Ann D.; Fehrenbacher, Jennifer S.
Nitrogen availability often limits biological productivity in marine systems, where inorganic nitrogen, such as ammonium is assimilated into the food web by bacteria and photoautotrophic eukaryotes. Recently, ammonium assimilation was observed in kleptoplast-containing protists of the phylum foraminifera, possibly via the glutamine synthetase/glutamate synthase (GS/GOGAT) assimilation pathway imported with the kleptoplasts. However, it is not known if the ubiquitous and diverse heterotrophic protists have an innate ability for ammonium assimilation. Using stable isotope incubations (15N-ammonium and 13C-bicarbonate) and combining transmission electron microscopy (TEM) with quantitative nanoscale secondary ion mass spectrometry (NanoSIMS) imaging, we...
Tipo: Text
Palavras-chave: Nitrogen cycle; Heterotrophic protists; Foraminifera; Ammonium assimilation; Heterotrophy; Marine.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00662/77421/79087.pdf

Factors determining the distribution of foraminiferal assemblages in Port Joinville Harbor (Ile d'Yeu, France): the influence of pollution
Provedor de dados: 5
Autores: Debenay, Jean-pierre; Tsakiridis, Erica; Soulard, René; Grossel, Hubert.
Port Joinville harbor is located on an island. Thus, it receives only a few freshwater inputs, contrary to most of the areas where the influence of pollution on foraminiferal assemblages has been studied. The pollution in the harbor mainly results from the boats, including cleaning, painting and outfall of oil and motor-fuel.A total of 59 sediment samples was collected at three sampling periods (November-December 1997, May 1998 and September 1998). These samplings were supplemented by the study of algal flora and macrobenthos and by the study of water circulation by means of six stations where water was collected every hour during a tide cycle. Contaminants were analyzed in the last series of 17 samples. Total assemblages were used for this study. This...
Tipo: Text
Palavras-chave: France; Atlantic; Harbor; Pollution; Bioindicators; Foraminifera.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-764.pdf

Benthic Foraminiferal response to sea level change in the mixed siliciclastic-carbonate system of southern Ashmore Trough (Gulf of Papua)
Provedor de dados: 5
Autores: Carson, Brooke E.; Francis, Jason M.; Leckie, R. Mark; Droxler, Andre W.; Dickens, Gerald R.; Jorry, Stephan J.; Bentley, Sam J.; Peterson, Larry C.; Opdyke, Bradley N.
Ashmore Trough in the western Gulf of Papua (GoP) represents an outstanding modern example of a tropical mixed siliciclastic-carbonate depositional system where significant masses of both river-borne silicates and bank-derived neritic carbonates accumulate. In this study, we examine how benthic foraminiferal populations within Ashmore Trough vary in response to sea level-driven paleoenvironmental changes, particularly organic matter and sediment supply. Two 11.3-m-long piston cores and a trigger core were collected from the slope of Ashmore Trough and dated using radiocarbon and oxygen isotope measurements of planktic foraminifera. Relative abundances, principal component analyses, and cluster analyses of benthic foraminiferal assemblages in sediment...
Tipo: Text
Palavras-chave: Papua New Guinea; Margins; Foraminifera.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00087/19837/17482.pdf

Devenir des bactéries dans les réseaux trophiques des vasières intertidales : le cas de brouage (Baie de Marennes-Oléron)
Provedor de dados: 5
Autores: Pascal, Pierre-yves.
Bacteria are highly abundant and productive in intertidal mudflat sediments. By analogy  with pelagic system, it has been suggested that bacteria play an important role in benthic food  web. Due to technical difficulties, numbers of studies dealing with benthic bacterivory are not  numerous and give conflicting results. A method using community of 15N enriched bacteria as  tracer was developed in order to measure grazing of meiofauna and macrofauna. Since enriched  bacteria present characteristics of size, activity and diversity close to natural ones, bias due to  selective bacterial ingestion by grazers are limited. Due to tidal cycles, intertidal mudflat  constitutes highly variable environment at short time scale. Since those variations may influence...
Tipo: Text
Palavras-chave: Stable isotope; Hydrobia ulvae; Foraminifera; Copepod; Nematode; Bacteria; Mudflat; Trophic foodweb; Isotope stable; Hydrobia ulvae; Foraminifère; Copépode; Nématode; Bactérie; Vasière; Réseau trophique.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-4778.pdf

Sensitivity of clumped isotope temperatures in fossil benthic and planktic foraminifera to diagenetic alteration
Provedor de dados: 5
Autores: Leutert, Thomas J.; Sexton, Philip F.; Tripati, Aradhna; Piasecki, Alison; Ling Ho, Sze; Nele Meckler, A.
Applying the clumped isotope (Δ47) thermometer to foraminifer microfossils offers the potential to significantly improve paleoclimate reconstructions, owing to its insensitivity to the isotopic composition of seawater (unlike traditional oxygen isotope (δ18O) analyses). However, the extent to which primary Δ47 signatures of foraminiferal calcites can be overprinted during diagenesis is not well known. Here, we present Δ47 data as well as high-resolution (∼10 kyr) δ18O and δ13C middle Eocene time series, measured on benthic and planktic foraminifera from ODP/IODP Sites 1408, 1409, 1410, 1050, 1260 and 1263 in the Atlantic Ocean. The sites examined span various oceanographic regimes, including the western tropical to mid-latitude North Atlantic, and the...
Tipo: Text
Palavras-chave: Clumped isotopes; Foraminifera; Diagenesis; Eocene; Stable-isotope geochemistry; Preservation.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00495/60683/64757.pdf

Etude ecologique de quelques foraminiferes de la cote saharienne de l'Atlantique.
Provedor de dados: 5
Autores: Le Calvez, Yolande.
Foraminifera were abundant in samples obtained from the Mauritanian coast. Their ecology and geographical location was studied. The genera and species are initially grouped according to the nature of the seabed and its depth. Those found in (1) deep mud at 500-1200 m, (2) muddy sand at 20-340 m, (3) shelly sand at 30-52 m are considered in turn. Group (I) varied according to the station of collection, and were affected by factors in addition to depth, such as the presence of corals. Muddy sand was poor in large individuals and in empty shells, but contained many displaced littoral forms. The very few living forms found in the shelly sand area was surprising; it may reflect the constant agitation of the sand or the small size of individuals, which could...
Tipo: Text
Palavras-chave: Foraminifera; Atlantic Sahara coast; Indexing in process.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-2045.pdf

Updated calibration of the clumped isotope thermometer in planktonic and benthic foraminifera
Provedor de dados: 5
Autores: Peral, Marion; Daeron, Mathieu; Blamart, Dominique; Bassinot, Franck; Dewilde, Fabien; Smialkowski, Nicolas; Isguder, Gulay; Bonnin, Jerome; Jorissen, Frans; Kissel, Catherine; Michel, Elisabeth; Vazquez Riveiros, Natalia; Waelbroeck, Claire.
Accurate reconstruction of past ocean temperatures is of critical importance to paleoclimatology. Carbonate clumped isotope thermometry (“Δ47”) is a relatively recent technique based on the strong relationship between calcification temperature and the statistical excess of 13C-18O bonds in carbonates. Its application to foraminifera holds great scientific potential, particularly because Δ47 paleotemperature reconstructions do not require assumptions regarding the 18O composition of seawater. However there are still relatively few published observations investigating the potential influence of parameters such as salinity or foraminiferal size and species. We present a new calibration data set based on 234 replicate analyses of 9 planktonic and 2 benthic...
Tipo: Text
Palavras-chave: Carbonate clumped isotopes; Foraminifera; Paleothermometry.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00450/56134/57676.pdf

Response of a kleptoplastidic foraminifer to heterotrophic starvation: photosynthesis and lipid droplet biogenesis
Provedor de dados: 5
Autores: Jauffrais, Thierry; Lekieffre, Charlotte; Schweizer, Magali; Jesus, Bruno; Metzger, Edouard; Geslin, Emmanuelle.
The aim of this work is to document the complex nutritional strategy developed by kleptoplastic intertidal foraminifera. We study the mixotrophic ability of a common intertidal foraminifer, E. williamsoni, by (1) investigating the phylogenetic identity of the foraminiferal kleptoplasts, (2) following their oxygenic photosynthetic capacity, and (3) observing the modification in cellular ultrastructural features in response to photoautotrophic conditions. This was achieved by coupling molecular phylogenetic analyses and TEM observations with non-destructive measurements of kleptoplast O2 production over a 15-day experimental study. Results show that the studied E. williamsoni actively selected kleptoplasts mainly from pennate diatoms and had the ability to...
Tipo: Text
Palavras-chave: Foraminifera; Electron microscopy; DNA barcoding; Kleptoplasty; Lipids.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00487/59894/63074.pdf

The impact of easily oxidized material (EOM) on the meiobenthos: Foraminifera abnormalities in shrimp ponds of New Caledonia; implications for environment and paleoenvironment survey
Provedor de dados: 5
Autores: Debenay, J.p.; Della Patrona, Luc; Herbland, Alain; Goguenheim, H.
This study was carried out in shrimp ponds from New Caledonia, in order to determine the cause of the exceptional proportion of abnormal tests (FAI) (often &gt;50%, sometimes &gt;80%). FAI was positively correlated to the quantity of easily oxidized material (EOM) deposited on the bottom of the ponds and to the sediment oxygen demand, and negatively correlated to redox. These results suggest that a very high FAI is a potential indicator for great accumulations of native organic matter, leading to a high sediment oxygen demand. When studying ancient sediments in core samples, exceptional abundances of abnormal tests may indicate periods of high accumulation of EOM, and therefore of oxygen depletion. This finding should help in better management of...
Tipo: Text
Palavras-chave: SW Pacific; Bioindicators; Organic matter; Shrimp ponds; Deformations; Foraminifera.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6955.pdf

Possible effects of global environmental changes on Antarctic benthos: a synthesis across five major taxa
Provedor de dados: 5
Autores: Ingels, Jeroen; Vanreusel, Ann; Brandt, Angelika; Catarino, Ana I.; David, Bruno; De Ridder, Chantal; Dubois, Philippe; Gooday, Andrew J.; Martin, Patrick; Pasotti, Francesca; Robert, Henri.
Because of the unique conditions that exist around the Antarctic continent, Southern Ocean (SO) ecosystems are very susceptible to the growing impact of global climate change and other anthropogenic influences. Consequently, there is an urgent need to understand how SO marine life will cope with expected future changes in the environment. Studies of Antarctic organisms have shown that individual species and higher taxa display different degrees of sensitivity to environmental shifts, making it difficult to predict overall community or ecosystem responses. This emphasizes the need for an improved understanding of the Antarctic benthic ecosystem response to global climate change using a multitaxon approach with consideration of different levels of biological...
Tipo: Text
Palavras-chave: Amphipoda; Echinoidea; Foraminifera; Global climate change; Isopoda; Nematoda; Southern Ocean; Zoobenthos.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00296/40762/39758.pdf

Bacterivory in the common foraminifer Ammonia tepida: Isotope tracer experiment and the controlling factors
Provedor de dados: 5
Autores: Pascal, P.y.; Dupuy, C; Richard, P; Niquil, N.
The majority of sediment dweller foraminifera are deposit feeders. They use their pseudopodia to gather sediment with associated algae, organic detritus and bacteria. Uptake of bacteria by foraminifera have been observed but rarely quantified. We measured uptake of bacteria by the common foraminifera Ammonia tepida using 15N pre-enriched bacteria as tracers. In intertidal flats, seasonal, tidal and circadian cycles induce strong variations in environmental parameters. Grazing experiments were performed in order to measure effects of abiotic (temperature, salinity and irradiance) and biotic (bacterial and algal abundances) factors on uptake rates of bacteria. In mean conditions, A. tepida grazed 78 pgC ind-1 h-1 during the first eight hours of incubation,...
Tipo: Text
Palavras-chave: Trophoecology; Prey abundance; Mudflat; Grazing; Foraminifera; Environmental factor; Bacteria.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4298.pdf

Eastern Tropical Pacific Climate And El Niño Variability During The Past Millennium
Provedor de dados: 5
Autores: Rustic, Gerald Thomas.
The El Niño Southern Oscillation (ENSO) has been implicated in large-scale climate shifts of the past millennia, but paleoclimate records from the dynamically vital eastern equatorial Pacific Ocean (EEP) spanning the past millennium are sparse. This has limited our understanding of tropical Pacific dynamics, leaving questions regarding the source of ENSO variability unanswered. Here I seek to address some of these questions regarding relationship between ENSO and tropical Pacific mean state, and the relationship between the tropical Pacific and large-scale climate. Mean EEP sea surface temperature (SST) for the past millennium was reconstructed using Mg/Ca ratios in Globigerinoides ruber from a sub-centennially resolved sediment core collected near the...
Tipo: Text
Palavras-chave: Eastern tropical pacific; ENSO; Foraminifera; Paleoceanography; Paleoclimate.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00495/60657/64154.pdf

Late paleozoic fusulinoidean gigantism driven by atmospheric hyperoxia
Provedor de dados: 5
Autores: Payne, Jonathan L.; Groves, John R.; Jost, Adam B.; Thienan Nguyen,; Moffitt, Sarah E.; Hill, Tessa M.; Skotheim, Jan M.
Atmospheric hyperoxia, with pO2 in excess of 30%, has long been hypothesized to account for late Paleozoic (360250 million years ago) gigantism in numerous higher taxa. However, this hypothesis has not been evaluated statistically because comprehensive size data have not been compiled previously at sufficient temporal resolution to permit quantitative analysis. In this study, we test the hyperoxia-gigantism hypothesis by examining the fossil record of fusulinoidean foraminifers, a dramatic example of protistan gigantism with some individuals exceeding 10 cm in length and exceeding their relatives by six orders of magnitude in biovolume. We assembled and examined comprehensive regional and global, species-level datasets containing 270 and 1823 species,...
Tipo: Text
Palavras-chave: Body size; Carboniferous; Cope's Rule; Foraminifera; Oxygen; Permian.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00265/37626/35865.pdf

Atlantic Meridional Overturning Circulation during the Last Glacial and Deglacial: Inferences from the Atlantic Tropical Thermocline Temperature and Seawater Radiocarbon Activity
Provedor de dados: 5
Autores: Huang, Enqing.
This thesis aims to investigate variations of the last glacial and deglacial Atlantic Ocean circulation, with emphasize on the Atlantic deepwater ventilation rate during the Last Glacial Maximum (LGM). The highlights of the thesis are as the followings: (1) the modern frontal zone between the North Atlantic and the South Atlantic central waters off NW Africa shifted to the south during the last glacial and deglacial time periods. (2) The radiocarbon-based circulation age of the deep Atlantic (&gt; 1500 m) was estimated to be less than 400 years during the LGM, which was equal to or less than its pre-bomb value. Therefore, the LGM deep Atlantic was inferred to be well ventilated. (3) The abyssal Atlantic (below 2500 m) prior to the LGM was more depleted in...
Tipo: Text
Palavras-chave: Climate change; Ocean circulation; Atlantic Ocean; Glacial; Deglacial; Thermocline; Radiocarbon; Global carbon cycle; Foraminifera; Carbonate; Trace elements; Deep ocean ventilation rates.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00493/60446/63891.pdf

Methodology for Single-Cell Genetic Analysis of Planktonic Foraminifera for Studies of Protist Diversity and Evolution
Provedor de dados: 5
Autores: Weiner, Agnes K. M.; Morard, Raphael; Weinkauf, Manuel F. G.; Darling, Kate F.; André, Aurore; Quillévéré, Frédéric; Ujiie, Yurika; Douady, Christophe J.; De Vargas, Colomban; Kucera, Michal.
Single-cell genetic analysis is an essential method to investigate the biodiversity and evolutionary ecology of marine protists. In protist groups that do not reproduce under laboratory conditions, this approach provides the only means to directly associate molecular sequences with cell morphology. The resulting unambiguous taxonomic identification of the DNA sequences is a prerequisite for barcoding and analyses of environmental metagenomic data. Extensive single-cell genetic studies have been carried out on planktonic foraminifera over the past 20 years to elucidate their phylogeny, cryptic diversity, biogeography, and the relationship between genetic and morphological variability. In the course of these investigations, it has become evident that genetic...
Tipo: Text
Palavras-chave: Foraminifera; Protists; Single-cell genetics; Cryptic diversity; Comparability; Methods; Laboratory protocols; Standardization.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00383/49460/49938.pdf

Trace element cartography of Globigerinoides ruber shells using particle-induced X-ray emission
Provedor de dados: 5
Autores: Gehlen, M; Bassinot, F; Beck, L; Khodja, H.
Micro particle-induced X-ray emission (PIXE) is a nondestructive elemental analysis technique that can be used to map the distribution of elements with a spatial resolution of +/-4 mum(2) and a penetration depth of +/-2 mum in a calcite matrix. To test its potential to improve our understanding of trace element distribution in foraminifera shells, we mapped the Mg distribution across individual chambers of the planktonic species Globigerinoides ruber. G. ruber shells were picked from equatorial Atlantic surface sediments (Sierra Leone Rise). They ranged from well-preserved to heavily dissolved tests. The mapping of trace elements across test chambers made it possible to discriminate between variability inherent to the shell material and heterogeneity...
Tipo: Text
Palavras-chave: Foraminifera; Mg/Ca; Dissolution; Trace elements; Instruments and techniques.
Ano: 2004
URL: https://archimer.ifremer.fr/doc/00228/33892/32319.pdf

Southwest Pacific Ocean response to a warmer world: Insights from Marine Isotope Stage 5e
Provedor de dados: 5
Autores: Cortese, G.; Dunbar, G. B.; Carter, L.; Scott, G.; Bostock, H.; Bowen, M.; Crundwell, M.; Hayward, B. W.; Howard, W.; Martinez, J.l.; Moy, A.; Neil, H.; Sabaa, A.; Sturm, A.
Paleoceanographic archives derived from 17 marine sediment cores reconstruct the response of the Southwest Pacific Ocean to the peak interglacial, Marine Isotope Stage (MIS) 5e (ca. 125ka). Paleo-Sea Surface Temperature (SST) estimates were obtained from the Random Forest modelan ensemble decision tree toolapplied to core-top planktonic foraminiferal faunas calibrated to modern SSTs. The reconstructed geographic pattern of the SST anomaly (maximum SST between 120 and 132ka minus mean modern SST) seems to indicate how MIS 5e conditions were generally warmer in the Southwest Pacific, especially in the western Tasman Sea where a strengthened East Australian Current (EAC) likely extended subtropical influence to ca. 45 degrees S off Tasmania. In contrast, the...
Tipo: Text
Palavras-chave: Interglacial climate; Foraminifera; South Pacific Ocean; Marine Isotope Stage 5; Sea surface temperature.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00264/37492/36995.pdf

Calibration of the carbon isotope composition (C-13) of benthic foraminifera
Provedor de dados: 5
Autores: Schmittner, Andreas; Bostock, Helen C.; Cartapanis, Olivier; Curry, William B.; Filipsson, Helena L.; Galbraith, Eric D.; Gottschalk, Julia; Carlos Herguera, Juan; Hoogakker, Babette; Jaccard, Samuel L.; Lisiecki, Lorraine E.; Lund, David C.; Martinez-mendez, Gema; Lynch-stieglitz, Jean; Mackensen, Andreas; Michel, Elisabeth; Mix, Alan C.; Oppo, Delia W.; Peterson, Carlye D.; Repschlaeger, Janne; Sikes, Elisabeth L.; Spero, Howard J.; Waelbroeck, Claire.
The carbon isotope composition (C-13) of seawater provides valuable insight on ocean circulation, air-sea exchange, the biological pump, and the global carbon cycle and is reflected by the C-13 of foraminifera tests. Here more than 1700 C-13 observations of the benthic foraminifera genus Cibicides from late Holocene sediments (C-13(Cibnat)) are compiled and compared with newly updated estimates of the natural (preindustrial) water column C-13 of dissolved inorganic carbon (C-13(DICnat)) as part of the international Ocean Circulation and Carbon Cycling (OC3) project. Using selection criteria based on the spatial distance between samples, we find high correlation between C-13(Cibnat) and C-13(DICnat), confirming earlier work. Regression analyses indicate...
Tipo: Text
Palavras-chave: Carbon; Isotopes; Benthic; Foraminifera; Calibration.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00661/77326/78788.pdf

Phase lag between Intertropical Convergence Zone migration and subtropical monsoon onset over the northwestern Indian Ocean during Marine Isotopic Substage 6.5 (MIS 6.5)
Provedor de dados: 5
Autores: Malaize, B.; Joly, C.; Venec-peyre, M. -t.; Bassinot, F.; Caillon, N.; Charlier, K.
High-resolution faunal and isotopic analyses of foraminifera were performed on core MD96-2073 (10 degrees 94'N, 52 degrees 62'E, 3142 m depth), located close to Socotra Island in the upwelling area of the Somali Basin ( NW Indian Ocean). This work focuses on Marine Isotopic Stage 6.5 in order to reconstruct paleo-upwelling changes and their links with the Arabian Sea summer monsoon and the migration of the Intertropical Convergence Zone (ITCZ). Correspondence and cluster analyses of planktonic foraminiferal abundances, partly controlled by temperature and water mass productivity, together with an upwelling intensification index, show the occurrence of a strong upwelling between 176 and 165 ka. This upwelling intensification responds to a northward...
Tipo: Text
Palavras-chave: Paleoclimatology; Foraminifera; Isotopes; Indian monsoon; ITCZ; Sapropels; Upwelling.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00234/34487/33433.pdf

Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years
Provedor de dados: 5
Autores: Rasmussen, Tl; Oppo, Dw; Thomsen, E; Lehman, Sj.
[1] Results from two deep sea cores from northeast of Newfoundland at 1251 and 2527 m water depth, respectively, indicate that during the time period from 160,000 to 10,000 years BP, ice rafting events in the Labrador Sea were accompanied by rapid variations in deep and surface water circulation. Twelve ice-rafting events occurred, each coinciding with high concentrations of detrital carbonate and oxygen isotopic depletion of both surface and bottom waters. Eleven of these can be correlated with the North Atlantic Heinrich events H1-H11. The remaining very conspicuous ice-rafting event took place early in MIS substage 5e, at a time when the planktic faunal assemblage suggests marked warming of the sea surface. In the shallower core, benthic delta(13)C...
Tipo: Text
Palavras-chave: Paleoceanography; Labrador Sea; Ice rafting; Foraminifera; Last climate cycle.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/00496/60768/65083.pdf

Benthic foraminifera from the deep-water Niger delta (gulf of Guinea): Assessing present-day and past activity of hydrate pockmarks
Provedor de dados: 5
Autores: Fontanier, Christophe; Koho, K. A.; Goni-urriza, M. S.; Deflandre, Bruno; Galaup, S.; Ivanovsky, A.; Gayet, Nicolas; Dennielou, Bernard; Gremare, Antoine; Bichon, S.; Gassie, C.; Anschutz, P.; Duran, R.; Reichart, G. J.
We present ecological and isotopic (δ18O and δ13C) data on benthic foraminifera sampled from 4 deep-sea stations in a pockmark field from the deep-water Niger delta (Gulf of Guinea, Equatorial Atlantic Ocean). In addition, a series of sedimentological and (bio)geochemical data are shown to back up foraminiferal observations. All stations are located within 1.2 km of each other, so prevailing oceanographic conditions can be assumed to be similar at each site. Two of the sites (GMMC-01 and GMMC-02) are located in a pockmark (named “pockmark A”) where current methane seepages were recorded by ROV observations. A third station (GMMC-03) is located in the topographic depression interpreted as a collapsed pockmark (named “pockmark B”). The fourth site (GMMC-04)...
Tipo: Text
Palavras-chave: Niger delta; Hydrate pockmark; Foraminifera; Stable isotopes; Bacteria.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00211/32194/30628.pdf

Interglacial variability (MIS 5 and MIS 7) and dinoflagellate cyst assemblages in the Bay of Biscay (North Atlantic)
Provedor de dados: 5
Autores: Penaud, A; Eynaud, F; Turon, J; Zaragosi, S; Marret, F; Bourillet, Jean-françois.
The interglacial periods of the late Quaternary are frequently investigated as they constitute potential analogues for our modem climate and may shed light on the key questions of natural climate variability and future developments. The aim of this work is to reconstruct the paleoenvironmental history of Marine Isotope Stages (MIS) 5 and 7 in deep-sea sediments of the northern Bay of Biscay (North East Atlantic Ocean). On the basis of a multiproxy compilation, including analysis of dinoflagellate cyst assemblages, we discuss the nature of the paleoenvironmental and paleoclimate changes that took place in this region. Recurrent successions Of Species marking the beginning and the Termination of the Interglacial Complexes (MIS 5 and MIS 7) revealed a...
Tipo: Text
Palavras-chave: Climatic optima; Interglacial Complexes; Marine Isotope Stages MIS 5 and 7; Celtic Armorican margin; Foraminifera; Dinoflagellate cysts.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-5020.pdf

The Impact of Methane on Microbial Communities at Marine Arctic Gas Hydrate Bearing Sediment
Provedor de dados: 5
Autores: Carrier, Vincent; Svenning, Mette M.; Grundger, Friederike; Niemann, Helge; Dessandier, Pierre-antoine; Panieri, Giuliana; Kalenitchenko, Dimitri.
Cold seeps are characterized by high biomass, which is supported by the microbial oxidation of the available methane by capable microorganisms. The carbon is subsequently transferred to higher trophic levels. South of Svalbard, five geological mounds shaped by the formation of methane gas hydrates, have been recently located. Methane gas seeping activity has been observed on four of them, and flares were primarily concentrated at their summits. At three of these mounds, and along a distance gradient from their summit to their outskirt, we investigated the eukaryotic and prokaryotic biodiversity linked to 16S and 18S rDNA. Here we show that local methane seepage and other environmental conditions did affect the microbial community structure and composition....
Tipo: Text
Palavras-chave: Arctic; Methane seeps; Prokaryotes; Methanotrophs; ANME; Sulfate-reducing bacteria; Eukaryotes; Foraminifera.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00667/77893/80077.pdf

Mid to late Holocene strengthening of the East Greenland Current linked to warm subsurface Atlantic water
Provedor de dados: 5
Autores: Perner, Kerstin; Moros, Matthias; Lloyd, Jeremy M.; Jansen, Eystein; Stein, Ruediger.
The relatively fresh and cold East Greenland Current (EGC) connects the Arctic with the subpolar North Atlantic Ocean. Its strength and influence on the freshwater balance in the North Atlantic affects both the Subpolar Gyre dynamics and deep convection in the Labrador Sea. Enhanced freshwater and sea-ice expansion in the subpolar North Atlantic is suggested to modify the northward heat transport within the North Atlantic Current. High-resolution palaeoceanographic reconstructions, based on planktic and benthic foraminifera assemblage data, from the central East Greenland shelf (Foster Bugt) reveal distinct centennial to millennial-scale oceanographic variability that relates to climatic changes during the mid to late Holocene (the last c. 6.3 ka BP). Our...
Tipo: Text
Palavras-chave: Foraminifera; East Greenland Current; Return Atlantic Current; Subpolar gyre; Polar front; Subpolar north Atlantic; Mid to late Holocene.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00496/60725/83614.pdf

Répartition et organisation des foraminifères actuels dans le golfe de Kalloni (Grèce)
Provedor de dados: 5
Autores: Favry, A; Guelorget, O; Debenay, Jp; Lefebvre, A; Perthuisot, Jp.
As part of a global investigation of foraminifera importance in the Mediterranean paralic realm, the distribution of present foraminifera in Kalloni Bay was studied through species determination and counting. From these basic data, density, species richness, Shannon Index and dominance were calculated for several stations covering the whole basin. In addition, a factorial analysis of correspondances between stations and species assemblages was performed. All these methods concur in showing that the organization of foraminifera populations follows sc principal longitudinal gradient from the entrance towards the most continental reaches and a subsidiary transverse gradient. When compared with sedimentological data, the distribution of foraminifera does not...
Tipo: Text
Palavras-chave: Foraminifera; Paralic; Confinement; Greece; Present.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20457/18129.pdf

Quantity Trumps Quality: Bayesian Statistical Accumulation Modeling Guides Radiocarbon Measurements to Construct a Chronology in Real-time
Provedor de dados: 5
Autores: Firesinger, Devon Robert.
The development of an accurate and precise geochronology is imperative to understanding archives containing information about Earth’s past. Unable to date all intervals of an archive, researchers use methods of interpolation to approximate age between dates. Sections of the radiocarbon calibration curve can induce larger chronological uncertainty independent of instrumental precision, meaning even a precise date may carry inflated error in its calibration to a calendar age. Methods of interpolation range from step-wise linear regression to, most recently, Bayesian statistical models. These employ prior knowledge of accumulation rate to provide a more informed interpolation between neighboring dates. This study uses a Bayesian statistical accumulation model...
Tipo: Text
Palavras-chave: Gas ion source; Accelerator mass spectrometry; Isotope dilution; Foraminifera; Pigmy Basin.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00494/60601/64087.pdf

Quantified intermediate water oxygenation history of the NE Pacific: A new benthic foraminiferal record from Santa Barbara basin
Provedor de dados: 5
Autores: Ohkushi, K.; Kennett, J. P.; Zeleski, C. M.; Moffitt, S. E.; Hill, T. M.; Robert, Cyril; Beaufort, L.; Behl, R. J.
The oxygen minimum zone (OMZ) of the late Quaternary California margin experienced abrupt and dramatic changes in strength and depth in response to changes in intermediate water ventilation, ocean productivity, and climate at orbital through millennial time scales. Expansion and contraction of the OMZ is exhibited at high temporal resolution (107-126 year) by quantitative benthic foraminiferal assemblage changes in two piston cores forming a vertical profile in Santa Barbara Basin (569 m, basin floor; 481 m, near sill depth) to 34 and 24 ka, respectively. Variation in the OMZ is quantified by new benthic foraminiferal groupings and new dissolved oxygen index based on documented relations between species and water-mass oxygen concentrations....
Tipo: Text
Palavras-chave: Oxygen minimum zone; Foraminifera; Ventilation; Oxygen index; Pacific; Hypoxia.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00264/37489/35811.pdf

Dissolution effects on the crystallography and Mg/Ca content of planktonic foraminifera Globorotalia tumida (Rotaliina) revealed by X-ray diffractometry
Provedor de dados: 5
Autores: Nouet, Julius; Bassinot, Franck.
Several authors suggested that the thinning, with increasing depth of deposition, of calcite X-ray diffractometry (XRD) peaks obtained on planktonic foraminifera tests resulted from the preferential removal of their poorly crystallized parts as dissolution increases. By deconvolving XRD peak (104) from Globorotalia tumida (surface sediments, Sierra Leone Rise depth transect), we show that the full width at midheight does not depend only upon crystallinity, but reflects also the chemical and structural heterogeneity of foraminifera tests, which results in closely spaced, individual (104) diffraction peaks corresponding to phases with slightly different Mg contents. G. tumida contains two calcite phases: a well crystallized, Mg-poor calcite and a poorly...
Tipo: Text
Palavras-chave: Dissolution; Foraminifera; X-ray diffraction; Crystallinity; Deconvolution.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00235/34626/32973.pdf

Timing of Svalbard/Barents Sea Ice Sheet Decay during the Last Glacial Termination
Provedor de dados: 5
Autores: Snow, Tasha.
The Arctic and North Atlantic underwent significant climactic changes since the Last Glacial Maximum (25,000 years before present (1950 AD); ka BP), but offsets in the timing of events between the two regions are poorly constrained due to age model uncertainties that arise from changing radiocarbon reservoir ages. Here, we use a relatively high-resolution, multi-proxy stable isotope and sedimentologic dataset from Eastern Fram Strait (ODP Leg 162 Site 986) marine sediments to constrain the timing of Svalbard/Barents Sea Ice Sheet decay and infer deglacial reservoir ages over the last 30 ka. We use magnetic susceptibility, inorganic and organic carbon, foraminiferal assemblage counts, planktonic foraminiferal isotopes, and iceberg-rafted debris proxies to...
Tipo: Text
Palavras-chave: Paleoceanography; Meltwater; Isotopes; Foraminifera; Fram Strait; Reservoir age.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00499/61045/64452.pdf

Comparison of benthic foraminifera and macrofaunal indicators of the impact of oil-based drill mud disposal
Provedor de dados: 5
Autores: Denoyelle, Marieva; Jorissen, Frans J.; Martin, Daniel; Galgani, Francois; Mine, Jacques.
We compare foraminifera and macrofauna as bio-indicators of oil-based drill mud disposal site off Congo. The most polluted sites are characterized by poor faunas, dominated by some very tolerant taxa. Slightly further from the disposal site, there is an area with strongly increased densities, heavily dominated by opportunistic taxa. Still further, macrofauna appears to be similar to that at the reference area, but the foraminiferal meiofauna still suggests a slight environmental perturbation. The foraminiferal FIEI index, based on the species distribution in the study area, appears to be more discriminative than the macrofaunal ITI index, based on a priori definitions of the trophic guilds of the various taxa. Our comparative approach allows us to point...
Tipo: Text
Palavras-chave: Bio-indicators; Biotic index; Drilling mud; Foraminifera; Macrofauna.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00019/13027/10203.pdf

Types and originals of fossil Porifera and Cnidaria of Indonesia in Naturalis
Provedor de dados: 16
Autores: Leloux, J.; Renema, W.
The collection of Naturalis contains a significant collection of fossil corals and sponges. Within the framework of the 'NWO Groot' digitalisation projects the typespecimens, mainly from Indonesia, of Gerth, Umbgrove and related researchers were catalogued. 3920 lots containing 3479 typespecimens related to 676 taxa are concerned.
Tipo: Article / Letter to the editor
Palavras-chave: Gerth; Martin; Umbgrove; Foraminifera; Hydrozoa; Scleractinia; Rugosa; Tabulata; Octocorallia; Bivalvia; Ammonoidea; Echinodermata; Rhodophyta; Tertiary; Permian; 38.22.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/270361

The stratigraphic positions of the Wadi Dukhan and Al Uwayliah formations, northeast Libya – a review
Provedor de dados: 16
Autores: Tmalla, A.F.A.
The stratigraphic positions of the Wadi Dukhan and Al Uwayliah formations are reviewed. Diagnostic Maastrichtian larger foraminiferal species from the Wadi Dukhan Formation in well B7 – 41 (Cyrenaica) and in well U2 – 6 (northeastern Sirt Basin) are illustrated for the first time. These species are Omphalocyclus macroporus (Lamarck), Siderolites cf. calcitrapoides Lamarck and Orbitoides cf. media (d’Archiac).   Following the rules of nomenclature, the type section of the Al Uwayliah Formation should be considered a composite stratotype. The section east of al Uwayliah village is the holostratotype (upper part of the formation) and the Jardas al Jarrari section is the parastratotype (lower part of the formation). The combined thickness of the two component...
Tipo: Article / Letter to the editor
Palavras-chave: Maastrichtian; Paleocene; Northeast Libya; Stratigraphy; Foraminifera; 38.22; 42.79.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/217418

Larger Foraminfera as marine environmental indicators
Provedor de dados: 16
Autores: Renema, W.
Tipo: Article / Letter to the editor
Palavras-chave: Foraminifera; Spermonde Shelf; Sulawesi; Cabilao; Philippines; Recent; Palaeogene; Diversity.
Ano: 2002
URL: http://www.repository.naturalis.nl/record/219196

Biological results of the Snellius expedition XXX : the foraminifera collected in 1929 and 1930 in the eastern part of the Indonesian Archipelago
Provedor de dados: 16
Autores: Hofker, J.
INTRODUCTION    Of the bottom material collected by the Snellius-Expedition 78 samples contained Foraminifera. Many of these samples were extremely small, since they were gathered by means of piston core samplers; some were larger, as they were collected by means of a dredge; others were samples in shallow water at beaches or reefs. A l l samples were fixed in formaldehyde, so that after the 40 years they remained in store before they were studied, rests of protoplasma were seldom preserved. The numerous plankton samples, preserved in formaldehyde or in alcohol, did note contain planktonic Foraminifera; obviously the small amount of CaC03 in the samples caused the dissolution of the tests.  The planktonic Foraminifera are not described here, as planktonic...
Tipo: Article / Letter to the editor
Palavras-chave: Foraminifera; Indonesia; Snellius Expedition 30; 42.94.
Ano: 1978
URL: http://www.repository.naturalis.nl/record/323936

Type specimens of Maastrichtian fossils in the National Museum of Natural History, Leiden
Provedor de dados: 16
Autores: Leloux, J.
The type specimens of Maastrichtian invertebrate fossils from Limburg, The Netherlands, present in the National Museum of Natural History, Leiden, are listed. The Upper Cretaceous plant type specimens from Limburg of Miquel that were once part of the Staring collection present in the Palaeobotanical Museum of the Utrecht University are also included. Specimens of species described by Bosquet are also listed, since they possibly include type material. Short biographies of some of the important collectors and investigators are presented.
Tipo: Article / Letter to the editor
Palavras-chave: Foraminifera; Scleractinia; Bivalvia; Ammonoidea; Nautiloidea; Asterozoa; Fossil plants; Ostracoda; Brachiopoda; Cirripedia; Staring Collection; 38.22.
Ano: 2002
URL: http://www.repository.naturalis.nl/record/216192

Estudio de prolóculus de los foraminíferos bentónicos de la Provincia de Manabí, Ecuador
Provedor de dados: 20
Autores: Gualancañay, E.
El presente trabajo está basado en el estudio del prolóculus de los foraminíferos bentónicos de la plataforma continental superior interna de la Provincia de Manabí, la misma que incluye la zona de turbulencia. El objetivo principal fue el de llegar a establecer las fases de reproducción mediante el estudio del prolóculus de cada uno de los ejemplares analizados.
Tipo: Journal Contribution
Palavras-chave: Reproduction; Foraminifera; Reproduction; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 1989
URL: http://hdl.handle.net/1834/2148

Foraminíferos bentónicos del Golfo de Guayaquil
Provedor de dados: 20
Autores: Gualancañay, E.
El objetivo principal de este estudio es dar a conocer las especies de foraminiferos bentónicos del Golfo de Guayaquil, como resultado de un muestreo obtenido en 29 estaciones, durante una expedición oceanográfica en aguas ecuatorianas abordo del R/V "Eastward" de la Universidad de Duke, Carolina del Norte, en Octubre de 1976. Se identificaron un total de 97 taxa de foraminíferos bentónicos, reportándose por primera vez en aguas ecuatorianas las siguientes especies: Cancris bradyi Saidova, Globobulimina hoeglundi Uchio, Göesella flintii Cushman, laticarinina pauperata (Parker and Jones), Listerella bradyana Cushman y Nodosaria cf. flintii Cushman.
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Cruises; Check lists; New taxa.
Ano: 1983
URL: http://hdl.handle.net/1834/2112

Distribución batimétrica de foraminíferos bentónicos (Protozoa:Foraminiferida) al sur del estrecho de Magallanes (52°-56°S), Chile
Provedor de dados: 20
Autores: Hromic, Tatiana.
Se analiza la distribución batimétrica de los foraminíferos bentónicos en el área de canales y fiordos, al sur del estrecho de Magallanes, (52-56°S), Chile. Para ello se estudiaron 34 muestras recolectadas en la zona de plataforma (35 - 650 m), durante la expedición CIMAR 3 FIORDOS (1998), organizada por el Comité Oceanográfico Nacional (CONA). Se obtuvieron 21.190 ejemplares los que fueron clasificados en 169 especies; sólo el 8,3% de las especies alcanzaron una representación superior al 2%, por lo cual, se seleccionaron 47 especies, según su abundancia por tramo, para verificar su distribución. Se reconocieron tres asociaciones: a) de aguas someras (0-150 m); en la porción más superficial (50 m) dominaron Buccella frigida, Buliminella elegantissima y...
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Bathymetric distribution.
Ano: 2009
URL: http://hdl.handle.net/1834/4176

Distribución de los foraminíferos bentónicos del Golfo de Guayaquil interior y su relación con algunos factores ambientales
Provedor de dados: 20
Autores: Gualancañay, E.
En la presente investigación se realiza el estudio de algunos factores ambientales: salinidad del agua superficial, turbidez, sedimentos y pH del sedimento, relacionados con las especies de foraminíferos bentónicos identificadas en el Golfo de Guayaquil, durante marzo y septiembre de 1988. Igualmente se realiza la distribución relativa de cada una de las especies halladas en el área.
Tipo: Journal Contribution
Palavras-chave: Distribution; Foraminifera; Environmental factors; Distribution; Environmental factors; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_2594.
Ano: 1989
URL: http://hdl.handle.net/1834/2151

Foraminíferos bentónicos de la Bahía de Santa Elena - Ecuador, durante 2006-2007
Provedor de dados: 20
Autores: Gualancañay, E.
Se identificaron doce especies de foraminíferos bentónicos en la bahía de Santa Elena, Ecuador, correspondientes a mayo de 2006 y octubre de 2007. Las especies halladas son típicas de aguas poco profundas entre 4 y 20 metros de profundidad sobre sedimento arenoso y mezcla de arena y limo y son las siguientes: Cibicides aknerianus, Cibicides bertheloti f. boueana, Elphidium articulatum, Nonion pizarrense, Quinqueloculina agglutinans, Quinqueloculina granulosa, Quinqueloculina lamarckiana, Rotalia beccarii, Saccammina calcarea, Textulariella foliacea, Textularia secasensis y Trochammina advena.
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Shallow water; Sand; Mud; Sand; Mud; Http://aims.fao.org/aos/agrovoc/c_6779; Http://aims.fao.org/aos/agrovoc/c_4973.
Ano: 2009
URL: http://hdl.handle.net/1834/3359

Recent planktonic foraminifera from deep-sea sediments from the eastern equatorial Pacific: proxies of the equatorial front in the late quaternary
Provedor de dados: 20
Autores: Martínez, J.I.; Bedoya, G.
Planktonic foraminifera recovered from 25 deep-sea sediment samples (core-tops) from the eastern Equatorial Pacific were analyzed for their geographic distribution and possible environmental controls. Samples collected deeper than the carbonate lysocline (-2800 m) show significant signs of dissolution, - when compared to sediment-trap samples -, resulting in the increase of the solution-resistant species Neogloboquadrina dutertrei, Neogloboquadrina pachyderma and Globorotalia cultrata and the reduction of the solution-susceptible species Globigerinita glutinata, Globigerinoides ruber and Globigerinoides sacculifer. Three bioprovinces, were recognized by Cluster analysis: (1) bioprovince I that occurs on the Cocos ridge where G. cultrata and N. pachyderma...
Tipo: Journal Contribution
Palavras-chave: Foraminifera.
Ano: 2001
URL: http://hdl.handle.net/1834/3195

Relación ecológica de Crassinella varians (Bivalvo) y Cibicides bertheloti, F. boueana (Foraminífero) en el Golfo de Guayaquil
Provedor de dados: 20
Autores: Gualancañay, E.; Cruz, M.
Fueron analizadas 29 muestras de sedimentos procedentes del Golfo de Guayaquil que correspondieron desde 12 m a 1598 m de profundidad. Se estudiaron los foraminíferos y bivalvos, resultado como especies más frecuentes y abundantes: Cibicides bertheloti, F. boueana y Crassinella varians respectivamente. Algunas referencias similares entre las 2 especies fueron determinadas y también una relación inversa en sus porcentajes de abundancia, en las estaciones que estuvieron presentes. Dos mapas de distribución fueron elaborados; así como también tablas de posición de las estaciones, presencia y frecuencia de las dos especies.
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Geographical distribution; Marine molluscs; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 1983
URL: http://hdl.handle.net/1834/2121

Notas hidrológicas de aguas superficiales ecuatorianas según indicadores biológicos-foraminíferos planctónicos
Provedor de dados: 20
Autores: Luzuriaga de Cruz, M.
El presente trabajo trata sobre la distribución de los foraminíferos planctónicos vivos en aguas superficiales del mar ecuatoriano, durante los periodos normales y anómalos del océano, ocurridos en determinadas épocas de los años 1971 a 1973 y 1974. El área de muestreo de mayor extensión comprende desde la costa hasta Long. 86°W entre Lat. 01°22'N y Lat. 03°16'S. La distribución de los foraminíferos planctónicos evidencia el desplazamiento de masas de aguas procedentes de la Cuenca de Panamá, Corriente del Perú y zonas de convergencia. Las especies indicadoras de aguas cálidas fueron: Globigerinoides ruber, Bloborotalia mebnardii, Globigerinoides sacculifer y de aguas frías: Globigerina quinqueloba, Globigerinita bradyi, Globigerina bulloides. Durante la...
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Plankton; Indicator species; Vertical distribution; Horizontal distribution; Coastal waters; Environmental conditions; Plankton; Indicator species; Coastal waters; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_25205; Http://aims.fao.org/aos/agrovoc/c_32980.
Ano: 1992
URL: http://hdl.handle.net/1834/2313

Distribución zoogeográfica de los géneros Cibicides sp., y Quinqueloculina sp., (Foraminíferos) de la zona de turbulencia de Monteverde, Ecuador durante noviembre 2007
Provedor de dados: 20
Autores: Gualancañay, E.
En el área de Monteverde se ha estudiado por primera vez a los foraminíferos bentónicos de la zona de turbulencia hasta los 20 metros de profundidad, caracterizada por la gran agitación de sus aguas debido a los oleajes y se ha encontrado en todas estaciones a las especies Cibicides bertheloti, f. bouena, Cibicides floridanus, Quinqueloculina lamarckiana y Quinqueloculina granulosa que pertenecen a la provincia zoogeográfica Panamena propuesta por Boltovskoy (1965), Boltovskoy y Gualancañay (1975), Boltovskoy (1976), and Gualancañay (1986).
Tipo: Journal Contribution
Palavras-chave: Biogeography; Foraminifera; Zoobenthos; Geographical distribution; Geographical distribution; Biogeography; Zoobenthos; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_915; Http://aims.fao.org/aos/agrovoc/c_15487.
Ano: 2007
URL: http://hdl.handle.net/1834/2350

Contribución al conocimiento del género Bolivina D'Orbigny 1839, (Foraminífero) en el Golfo de Guayquil
Provedor de dados: 20
Autores: Gualancañay, E.
Se analizaron 29 muestras de fondo en el presente estudio, entre las profundidades de 13 y 1958 m, colectadas durante el crucero R/V "Eastward", en octubre de 1976, (Tabla 1). Se identificaron un total de 11 especies del género Bolivina: B. acutula Bandy; B. alata (Seguenza); B. globulosa Cushman; B. interjuncta, f. typica Cushman; B. pacifica Cushman &amp; McCulloch; B. plicata D'Orbigny; B. pseudoplicata Heron-Allen &amp; Earland; B. pseudobeyrichi Cushman, f. bradyi Asano; B. subadvena serrata Natland; B. cf. spissa Cushman y B. tongi Cushman.
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Geographical distribution; Zooplankton; Geographical distribution; Zooplankton; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 1983
URL: http://hdl.handle.net/1834/2341

Foraminíferos bentónicos de Salinas, Ecuador y su relación con el medio
Provedor de dados: 20
Autores: Gualancañay, E.
Salinas por su posición en la península de Santa Elena está situada en el límite noroeste del Golfo de Guayaquil y, debido a que la línea costanera se curva hacia el noroeste y se coloca por ello fuera de la acción de la corriente de Humboldt, aumenta progresivamente la precipitación hacia el norte (PMRC, 1995). Se realiza el estudio de las especies de foraminíferos bentónicos del área de Salinas y se hace la relación de las especies más frecuentes: Elphidium articulatum, f, typica; reophax cf. guttiferus; Rotalia cubensis y Textularia secasensis con los factores ambientales: salinidad, temperatura, pH, oxígeno, profundidad, turbidez, alimentación y sustrato.
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Benthos; Environmental factors; Geographical distribution; Benthos; Environmental factors; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 2000
URL: http://hdl.handle.net/1834/2290

Distribución espacio-temporal del ictioplancton y zooplancton marino en las Islas Galápagos, Ecuador (1988-2001)
Provedor de dados: 20
Autores: Luzuriaga de Cruz, M.
La distribución del ictioplancton y zooplancton alrededor de las Islas Galápagos, 89°W, 92°30'W y 01°N, 02°S, fue realizada con datos e información proveniente de cruceros de investigación entre los años 1988 hasta 2001. Áreas de mayor abundancia de zooplancton  e ictioplancton han sido identificadas hacia el norte y sur de Isla Isabela y alrededor de la Isla Fernandina, asociados a la Corriente de Cromwell y afloramiento foraminíferos planctónicos, larvas de eufásidos y copépodos fueron predominantes en las áreas mencionadas. Activa productividad secundaria relacionada con el frente ecuatorial se observó también hacia el sureste de Isabela, este de San Cristóbal y norte de Isla Santiago, con elevados porcentajes (&gt;50%) de Globigerina bulloides...
Tipo: Journal Contribution
Palavras-chave: Ichthyoplankton; Zooplankton; Upwelling; Foraminifera; Abundance; Cruises; Zooplankton; Http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 2009
URL: http://hdl.handle.net/1834/3358

Foraminíferos bentónicos de Manabí, Bahía de Caráquez en la costa ecuatoriana, durante la estación lluviosa del 2012
Provedor de dados: 20
Autores: Gualancañay, E.
During the rainy season of the ecuadorian coast (march 2012) in the study area including two environmental: Marine area and estuarine area. Were identified in Caraquez Bay the following species of benthic foraminifera: Bulimina pulchella, Cibicidea aknerianus, C. bertheloti, F. boueana, Elphidium articulatum, F. typical, Nonion pizarrense, Quinqueloculina lamarckiana, Rotalia beccarii, Triloculina globulosa, y Uvigerina incilis. These species correspond to the Pananmian zoogeographic province proposed by Boltovskoy (1965) and confirmed by Boltovskoy and Gualancañay (1975, 1986).
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Biogeography; Rain; Seasons; Environments.
Ano: 2013
URL: http://hdl.handle.net/1834/5753

Foraminíferos bentónicos de los Canales de Jambelí y del Morro en el Golfo de Guayaquil
Provedor de dados: 20
Autores: Gualancañay, E.
En este trabajo se presentan los resultados de las investigaciones de foraminíferos bentónicos, muestreados durante los cruceros de marzo y agosto de 1985, en los Canales de Cascajal y Jambelí (Fig. 1 y 2), y en febrero de 1987 en el Canal del Morro (Fig. 3). Un total de 19 especies fueron identificadas (Tabla II), las que están determinando ambientes estuarino y marino. Las especies con mayor frecuencia relativa fueron relacionadas con los sedimentos superficiales y la profundidad. Habiendo obtenido como resultado una pobreza en la población de foraminíferos bentónicos en toda el área de estudio.
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Geographical distribution; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 1987
URL: http://hdl.handle.net/1834/2134

The foraminiferal fauna of the Bony estuary: A baseline study.
Provedor de dados: 20
Autores: Dublin-Green, C.O.
The effect of oil exploration, production and other oil related industrial activities on the estuarine environment of the Niger Delta has resulted in increasing need of baseline information to be used as background levels against which pollution effects could be detected and monitored.  A one-year (December, 1986 - December, 1987) baseline survey of the benthic foraminiferal fauna of the Bonny estuary showed that arenaceous forminifera strongly dominated the total and living assemblages.  The subordinate calcareous groups were mostly found in the lower reaches of the estuary.  The foraminiferal fauna was represented by thirty-three species, twenty-three of which were arenaceous, nine calcareous and one porcellaneous. Twenty nine of the thirty-three species...
Tipo: Report
Palavras-chave: Fauna; Foraminifera; Fauna; Http://aims.fao.org/aos/agrovoc/c_2821.
Ano: 1990
URL: http://hdl.handle.net/1834/2431

Distribución de los foraminíferos bentónicos del Golfo de Guayaquil
Provedor de dados: 20
Autores: Gualancañay, E.
Este trabajo sobre la distribución de los foraminíferos bentónicos del Golfo de Guayaquil, es el complemento de un estudio taxonómico realizado en la misma área, Gualancañay (1983). Durante la expedición científica "Eastwards/76. De acuerdo a los resultados de los análisis cualitativo y de abundancia relativa de las especies de foraminíferos bentónicos del Golfo de Guayaquil, demuestran que esta área pertenece al provincia zoogeográfica panameña propuesta por (Boltovskoy, 1965; Boltovskoy &amp; Gualancañay, 1975; Boltovskoy, 1976; Gualancañay, 1978).
Tipo: Journal Contribution
Palavras-chave: Distribution; Foraminifera; Zoogeography; Benthos; Taxonomy; Benthos; Distribution; Taxonomy; Zoogeography; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_7631; Http://aims.fao.org/aos/agrovoc/c_15488.
Ano: 1986
URL: http://hdl.handle.net/1834/2178

Foraminíferos  (PROTOZOA: FORAMINIFERIDA)de la superfamilia BULIMINACEA JONES 1875, en canales y fiordos patagónicos, Chile
Provedor de dados: 20
Autores: Hromic, Tatiana; Zúñiga, Mireya.
En la región de canales y fiordos patagónicos del Pacífico sudoriental, Chile (42º - 56º S) se obtuvieron 12.343 ejemplares de la superfamilia Buliminacea Jones, 1875 (Protozoa: Foraminiferida), siendo clasificados en 4 familias, 6 géneros y 17 especies. Los foraminíferos fueron extraídos durante las expediciones Cimar 2 Fiordos, Cimar 3 Fiordos, Cimar 7 Fiordos, Cimar 8 Fiordos, organizadas por el Comité Oceanográfico Nacional (CONA) en el área comprendida entre 44º y 56º S. Los taxones con mayor representación fueron las familias Uvigerinidae y Buliminidae, las cuales alcanzaron un 79,9% y 18,2% respectivamente. Además, destacaron la abundancia de las especies: Angulogerina angulosa (67,9%) y Globobulimina notovata (13,1%). La distribución geográfica...
Tipo: Journal Contribution
Palavras-chave: Foraminifera.
Ano: 2003
URL: http://hdl.handle.net/1834/4339

Nuevos datos sobre la geología del Golfo de México y el Mar Caribe
Provedor de dados: 20
Autores: Melnik, V. I.; Zernestki, B. F.
New marine geological data of Cuban shelf were obtained during Cuban-Soviet Expedition of 1964-1965. The micro and macrofauna and substancial composition were studied. Bentonic foraminifera appeared over 100 m depth in the Gulf of Mexico. The muds were the most caracteristic sediment of the Caribbean Sea. The composition or rare rock was studied in the Yucatan Strait. With a big content of Si, Al, Mg, Ca, Fe and Ti was noted a low content of Na. This is not characterisc on eruptioned calcareous rocks.
Tipo: Journal Contribution
Palavras-chave: Marine geology; Foraminifera; Rocks; Marine geology; Rock.
Ano: 1969
URL: http://hdl.handle.net/1834/5720

Aspectos bioecológicos del ictioplancton en la estación fija "La Libertad" durante 1997
Provedor de dados: 20
Autores: Luzuriaga de Cruz, M.; Ortega, D.; Elías, E.
El presente trabajo se refiere a las variaciones observadas en el ictioplancton presente en la estación fija "La Libertad" desde febrero de 1997 hasta diciembre del mismo año. Los datos se relacionan con las observaciones ecológicas hechas en base a indicadores de masas de agua, formaníferos planctónicos, presentes en las mismas muestras.
Tipo: Journal Contribution
Palavras-chave: Ichthyoplankton; Fixed stations; Fish larvae; Fish eggs; Foraminifera; Community composition; Species diversity; Fish larvae; Species diversity; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 1998
URL: http://hdl.handle.net/1834/2289

Foraminíferos del rift de Galápagos
Provedor de dados: 20
Autores: Gualancañay, E.
Para este trabajo se analizaron un total de 17 muestras de sedimento para el estudio de los foraminíferos, se identificaron 10 especies de foraminíferos planctónicos y 8 especies de f. bentónicos. Las muestras fueron colectadas durante la expedición científica "GEOMETEP III", simultáneamente por el R/V "SONNE", de la República Federal Alemana y por el BAE "ORION", del Instituto Oceanográfico de la Armada del Ecuador, entre el 19 de Enero y el 16 de Febrero de 1983, en el rift de Galápagos, para un estudio de prospección en el área del 85/ 86°W, para iniciar un reconocimiento en la transecta de los 85° 30'W.
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Sediments.
Ano: 1986
URL: http://hdl.handle.net/1834/2107

Foraminíferos bentónicos recientes en sedimentos de fondo de la cuenca de Panamá (Pacífico colombiano), como indicadores de productividad y oxigenación
Provedor de dados: 20
Autores: Betancur, M.J.; Martínez, I.
Thirteen deep-sea samples (core-tops) from the Panama Basin, Colombian Pacific, were analysed for benthonic foraminifera in the &gt;150μm size fraction. Based on the microfaunal content, three zones are recognised in the Panama Basin: (1) northern euphrophic region (~8º to 5,5ºN), characterized by a high concentration of organic matter flux to the seafloor, oxygenated sediments, and influence of the Panama Bight and the Costa Rica Dome upwelling systems, (2) mesotrophic region (~5,5 to 2ºN), characterized by low fluxes of organic carbon to the seafloor, oxygenated sediments, terrigenous influence and fluctuations of the upwelling systems of the basin, and (3) southern euphotic region (south of ~2ºN), characterized by a larger organic carbon flux to the...
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Oxygenation.
Ano: 2003
URL: http://hdl.handle.net/1834/3111

Estructura comunitaria del taxa Foraminiferida (Protozoa), según profundidad, en el fiordo Comau, Chiloé, Chile
Provedor de dados: 20
Autores: Hromic, Tatiana.
La composición de las comunidades foraminiferológicas en sedimentos superficiales de aguas menores a 30 m y mayores a 80 m del fiordo Comau, golfo de Ancud, Chiloé, Chile, aplicando SIMPER, ANOSIM, MDS y análisis de Cluster, muestran una alta diferencia y distinguen dos comunidades: una de aguas someras, en la cual las especies que más contribuyen a la similitud de las muestras son Ammonia beccarii (87,6 %) y Buccella peruviana (4,48 %) y otra de aguas más profundas, en la cual, las especies que más contribuyen a su individualización son: Uvigerina bifurcata (24,8%), Bulimna notovata (21,8%), Bulimina patagonica (14,42%), Nonionella auris (10,11%), Globocassidulina minuta (7,37%), Nonionoides grateloupi (3,94%), Quinqueloculina seminula (3,44%), Buccella...
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Bathymetric distribution.
Ano: 2009
URL: http://hdl.handle.net/1834/4166

Foraminíferos y ostrácodos del Pleistoceno tardío (Mar Chiquita, provincia de Buenos Aires, Argentina)
Provedor de dados: 41
Autores: Ferrero,Laura.
Sobre la base del estudio de foraminíferos y ostrácodos, se describe la evolución de ambientes marino- costeros al sudeste de la provincia de Buenos Aires afectados por las variaciones del nivel del mar durante el Pleistoceno tardío. Fueron estudiadas dos perforaciones realizadas al sur de la laguna Mar Chiquita. En las secciones inferiores de las perforaciones (A y B) se registran ambientes marinos marginales que pueden ser asignados a la Formación Canal 5 correlacionable con el último máximo interglacial (subestadio isotópico 5e). En los niveles fértiles inferiores de la perforadión A y en toda la sección B las asociaciones de foraminíferos, dominadas por Ammonia beccarii (Linné), permiten inferir ambientes marinos litorales a lagunas costeras. Las...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foraminifera; Ostracoda; Pleistoceno tardío; Transgresión marina; Paleoambientes.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142009000400005

Foraminíferos de la Formación Irigoyen, Neogeno, Tierra del Fuego, Argentina: su significado paleobiogeográfico
Provedor de dados: 41
Autores: Malumián,Norberto; Scarpa,Romina.
En la Formación Irigoyen (Mioceno superior-Plioceno, cuenca transtensiva del río Irigoyen, costa atlántica de Tierra del Fuego) se reconocen dos agrupamientos de foraminíferos bentónicos de aguas someras de fuerte carácter austral. El agrupamiento inferior, dominado por Angulogerina angulosa fueguina (Malumián), es en general similar a los foraminíferos de la Formación Carmen Silva, contiene " Trochoelphidiella " sp., previamente descrita para el Oligo-Mioceno de la Antártida. El agrupamiento superior está dominado por Nonion hancocki Cushman y McCulloch, una especie previamente conocida sólo en las actuales costas peruanas, y contiene frecuente Cribrorotalia meridionalis (Cushman y Kellett), especie que en la actualidad se distribuye abundantemente desde...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foraminifera; Neogeno; Tierra del Fuego; Paleobiogeografía.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200008

Distribución de Nonionella auris (d'Orbigny) (Foraminiferida) en el golfo San Matías, provincia de Río Negro, Argentina
Provedor de dados: 41
Autores: Bernasconi,Emiliana; Cusminsky,Gabriela.
Se estudia la influencia del tipo de sedimento y la profundidad en la distribución y desarrollo del foraminífero bentónico Nonionella auris (d'Orbigny). Se analizaron muestras de sedimentos superficiales provenientes del golfo San Matías, provincia de Río Negro, Argentina. Los estudios cualitativos, cuantitativos y estadísticos realizados sugieren que sitios con mayor profundidad, mayor contenido de fango y bajo nivel de energía propiciarían el desarrollo de esta especie.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foraminifera; Nonionella auris; Distribución; Golfo San Matías; Argentina.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000100011

Foraminíferos del Oligoceno inferior de los Andes Fueguinos, Argentina: su significado tectónico-ambiental
Provedor de dados: 41
Autores: Scarpa,Romina; Malumián,Norberto.
Se describen dos agrupamientos de foraminíferos calcáreos del Oligoceno Temprano de las capas de la Estancia María Cristina, críticos en la cronología de los acontecimientos tectónicos y paleoecológicos de los Andes Fueguinos. Estos agrupamientos indican el inicio de la más profunda antefosa del Cretácico Superior-Cenozoico fueguino y acotan la edad de la fosilización del frente plegado. Las capas se han depositado mayormente por debajo de la línea de compensación de la calcita y contienen principalmente foraminíferos aglutinados que atestiguan el ingreso de aguas corrosivas antárticas. De muy restringidos niveles que han escapado a la disolución en el interior de la Isla, y próximo a la Estancia, se ha recuperado uno de los agrupamientos, de ambiente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foraminifera; Oligoceno Temprano; Antefosa; Andes Fueguinos.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000200010

Ostracoda and foraminifera from Paleocene (Olinda well), Paraíba Basin, Brazilian Northeast
Provedor de dados: 42
Autores: PIOVESAN,ENELISE K.; MELO,ROBBYSON M.; LOPES,FERNANDO M.; FAUTH,GERSON; COSTA,DENIZE S.
ABSTRACT Paleocene ostracods and planktonic foraminifera from the Maria Farinha Formation, Paraíba Basin, are herein presented. Eleven ostracod species were identified in the genera Cytherella Jones, Cytherelloidea Alexander, Eocytheropteron Alexander, Semicytherura Wagner, Paracosta Siddiqui, Buntonia Howe, Soudanella Apostolescu, Leguminocythereis Howe and, probably, Pataviella Liebau. The planktonic foraminifera are represented by the genera Guembelitria Cushman, Parvularugoglobigerina Hofker, Woodringina Loeblich and Tappan, Heterohelix Ehrenberg, Zeauvigerina Finlay, Muricohedbergella Huber and Leckie, and Praemurica Olsson, Hemleben, Berggren and Liu. The ostracods and foraminifera analyzed indicate an inner shelf paleoenvironment for the studied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Ostracods; Paleocene; Paraíba Basin; Foraminifera.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401443