Faculty Opinions recommendation of Evidence for complete denitrification in a benthic foraminifer.

2006 ◽  
Author(s):  
Don Canfield
Keyword(s):  
Benthic Foraminifer

scholarly journals VÝSLEDKY MIKROPALEONTOLOGICKÉ REVIZE ŠARATICKÝCH CF VRTŮ

2014 ◽  
Vol 21 (1-2) ◽  
Author(s):  
Miroslav Bubík
Keyword(s):  
Cluster Analysis ◽  
Marginal Zone ◽  
Benthic Communities ◽  
Field Observations ◽  
Benthic Foraminifer ◽  
Planktonic Foraminifers ◽  
Carpathian Flysch ◽  
Sponge Spicules ◽  
Fish Otoliths

Restudy of archive foraminifer slides from Šaratice boreholes and new field observations allowed revision of the geology in the margin of the Carpathian Flysch Belt southeast of Brno. In the marginal zone originally assigned to the Němčice Formation newly three different formations were distinguished: Pouzdřany Formation of the Pouzdřany Nappe, and Němčice and Menilite formations of the Ždánice Nappe. Planktonic foraminifers were applied in biostratigraphical assignment of samples. Benthic communities were statistically evaluated using cluster analysis. Each formation has distinct microfossil taphocoenosis and characteristic benthic foraminifer community. Microfossil communities with abundant sponge spicules and diatom valves preserved in opal and also presence of small mollusc fauna and fish otoliths indicate that marginal zone of Ždánice Nappe was deposited little bit shallower than the more internal zones. Also lithology reflects different palaeoenvironment. Clays of the Menilite Formation are macroscopically undistinguishable from Hustopeče-type clays of the overlying Ždánice-Hustopeče Formation. The Ždánice-type sandstones are practically missing. Grey pelocarbonate concretions are frequent in both Menilite and Ždánice-Hustopeče formations. The marker lithologies of the Menilite Formation – the menilite chert and Dynów-type marlstone (or their analogues) – were not observed yet. Results of the revision show that the marginal zone of the Carpathian Flysch Belt in Šaratice area comprises tectonic slices of mentioned formations, the number and order of whose change from borehole to borehole.

scholarly journals A novel salinity proxy based on Na incorporation into foraminiferal calcite

2013 ◽  
Vol 10 (3) ◽  
pp. 6039-6063
Author(s):  
J. C. Wit ◽  
L. J. de Nooijer ◽  
M. Wolthers ◽  
G. J. Reichart
Keyword(s):  
Laser Ablation ◽  
Growth Rates ◽  
Benthic Foraminifer ◽  
Culture Experiment ◽  
Test Size ◽  
Lower Salinity ◽  
Icp Ms ◽  
Seawater Salinity ◽  
Temperature Reconstructions ◽  
The Impact

Abstract. Salinity and temperature determine seawater density and differences in both thereby control global themohaline circulation. Whereas numerous proxies have been calibrated and applied to reconstruct temperature, a direct and independent proxy for salinity is still missing. Ideally, a new proxy for salinity should target one of the direct constituents of dissolved salt, such as [Na+] or [Cl−]. This study investigates the impact of salinity on foraminiferal Na/Ca values by laser ablation ICP-MS analyzes of specimens of the benthic foraminifer Ammonia tepida cultured at a range of salinities (30.0–38.6). Foraminifera at lower salinities (30.0 and 32.5) added more chambers (10–11) to their test over the course of the experiment than foraminifera cultured under higher salinity (36.1, 7–8 chambers, and 38.6, 6–7 chambers), suggesting that lower salinity promotes growth rates in this species. The Na/Ca of cultured specimens correlates significantly with seawater salinity (Na/Ca = 0.22S − 0.75, R2 = 0.96, p < 0.01) and size. Values for Na/Ca and DNa vary between 5.17 and 9.29 mmol mol−1 and 0.12–0.16 × 10−3, which is similar to inorganic precipitated calcite. The significant correlation between test size and Na/Ca results from co-variation with salinity. This implies that foraminiferal Na/Ca may well be a robust and independent proxy for salinity, enabling independent salinity reconstruction. The quantified effect of salinity on Mg/Ca in our culture experiment, furthermore allows a direct correction for the bias in Mg/Ca based temperature reconstructions caused by differences in salinity.

Gavelinella Breardi, A New Name For the Turonian Gulf Coast Marker Species Anomalina “w”

2017 ◽  
Vol 47 (4) ◽  
pp. 358-365 ◽  
Author(s):  
Richard A. Denne ◽  
Arden D. Callender ◽  
Nancy Engelhardt-Moore ◽  
Russell E. Hinote ◽  
Christopher M. Lowery
Keyword(s):  
Gulf Coast ◽  
Similar Species ◽  
Benthic Foraminifer ◽  
Similar Form ◽  
Eagle Ford ◽  
New Name ◽  
Stratigraphic Range

Abstract The name Gavelinella breardi n. sp. is proposed for the Turonian benthic foraminifer informally known as Anomalina “W”. This species is used by industry paleontologists as a marker for the Eagle Ford Group of Texas and has a known stratigraphic range from the Late Cenomanian to the Late Turonian. It is distinguished from the similar species Gavelinella petita and Planulina eaglefordensis by its raised, limbate sutures in early whorls. Another similar form, Anomalina redmondi Petters, is reassigned to the genus Gavelinella.

Bispiraloconulus serbiacus gen. et sp. nov., a giant arborescent benthic foraminifer from the Berriasian of Serbia

2019 ◽  
Vol 93 ◽  
pp. 98-106 ◽  
Author(s):  
Felix Schlagintweit ◽  
Ioan I. Bucur ◽  
Milan N. Sudar
Keyword(s):  
Benthic Foraminifer

scholarly journals Carbon isotope offsets between benthic foraminifer species of the genusCibicides(Cibicidoides) in the glacial sub-Antarctic Atlantic

2016 ◽  
Vol 31 (12) ◽  
pp. 1583-1602 ◽  
Author(s):  
Julia Gottschalk ◽  
Natalia Vázquez Riveiros ◽  
Claire Waelbroeck ◽  
Luke C. Skinner ◽  
Elisabeth Michel ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Benthic Foraminifer

Pleurostomella concava: a new benthic foraminifer in Oligocene and Miocene sediments from the Pacific and Indian Oceans

1991 ◽  
Vol 65 (4) ◽  
pp. 595-601
Author(s):  
J. Otto R. Hermelin
Keyword(s):  
Baja California ◽  
Benthic Foraminifer ◽  
The Pacific ◽  
Guadalupe Island

The species Pleurostomella concava is a new benthic foraminifer recognized in Oligocene and Miocene sediments from the Indian and Pacific Oceans. The first mentioned finding of this species is in the material recovered from the experimental Mohole drilling near Guadalupe Island off Baja California. The morphology of Pleurostomella concava differs distinctively from other species of the genus Pleurostomella by its concave apertural face and keel-like rim around the ultimate chamber.

scholarly journals Assessing the Cadmium Effects on the Benthic Foraminifer Ammonia cf. parkinsoniana: An Acute Toxicity Test

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1018 ◽  
Author(s):  
María Teresa Losada Ros ◽  
Eqbal Al-Enezi ◽  
Erica Cesarini ◽  
Barbara Canonico ◽  
Carla Bucci ◽  
...  
Keyword(s):  
Lipid Droplets ◽  
Nile Red ◽  
Natural Seawater ◽  
Benthic Foraminifer ◽  
Complementary Information ◽  
Direct Evaluation ◽  
Quality Guidelines ◽  
Bioassay Experiment ◽  
Confocal Images ◽  
Hazardous Pollutants

Heavy metals are one of the most hazardous pollutants in marine environments because of their bioaccumulation and biomagnification capabilities. Among them, cadmium (Cd) has been considered as one of the most dangerous for marine organisms. Here we incubated Ammonia cf. parkinsoniana specimens, a benthic foraminiferal taxon used in previous experiments, for up to 48 h in natural seawater with different concentrations of Cd to unravel the physiological change. We document a reduced pseudopodial activity of the Cd-treated specimens at concentrations >10–100 ppb in comparison with the control specimens. Moreover, confocal images of Cd-treated specimens using Nile Red as a fluorescent probe reveal an enhanced intracellular neutral lipid accumulation in the form of lipid droplets at 6 h and 12 h. This bioassay experiment allows for the direct evaluation of Cd-dose to A. cf. parkinsoniana-response relationships under laboratory controlled conditions and provides complementary information to field observations as well as to water quality guidelines and thresholds.

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