Article
Geochemistry & Geophysics
Julie N. Richey, Jennifer S. Fehrenbacher, Caitlin E. Reynolds, Catherine V. Davis, Howard J. Spero
Summary: This study investigates the influences of environmental factors on barium enrichment in Globorotalia truncatulinoides by analyzing samples from a sediment trap time series in the northern Gulf of Mexico. The results show that the Ba/Ca ratio in the lamellar calcite of G. truncatulinoides is significantly higher than that in the crust. The vertical gradient in seawater barium concentration is found to be insufficient in explaining the intra-test Ba/Ca variations in G. truncatulinoides.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Ecology
Thore Friesenhagen
Summary: The test size of planktonic foraminifera has increased in the last 12 million years, possibly as an adaptive response to surface-water stratification. In favorable environments, foraminifera exhibit larger test sizes, while the size decreases in less favorable environments. The sudden occurrence of a giant form of Globorotalia menardii may be explained by regional evolutionary events or immigration from the Indian Ocean.
Article
Multidisciplinary Sciences
Nitzan Yanay, Zhennan Wang, David L. Dettman, Jay Quade, Katharine W. Huntington, Andrew J. Schauer, David D. Nelson, J. Barry McManus, Kaustubh Thirumalai, Saburo Sakai, Anna Rebaza Morillo, Ananya Mallik
Summary: This study presents an optical spectroscopic method for measuring carbonate clumped isotopes. The method utilizes a TILDAS system which enables rapid and precise measurement of CO2 isotopologue abundances without assuming 17O abundance. The results from the TILDAS system are consistent with IRMS measurements after calibration. This measurement method has the potential to revolutionize clumped isotope analysis.
Article
Geochemistry & Geophysics
Esmee Geerken, Lennart de Nooijer, Takashi Toyofuku, Anne Roepert, Jack J. Middelburg, Michiel V. M. Kienhuis, Yukiko Nagai, Lubos Polerecky, Gert-Jan Reichart
Summary: The study investigates the precipitation rate of calcite in benthic foraminifera and finds that it is similar to the maximum reported rates for inorganic calcite precipitation. The results also suggest a conceptual model for foraminiferal calcification involving active ion transport and thermodynamics. Seawater transport may also play a role in the initial stages of calcification.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Lukas Jonkers, Akshat Gopalakrishnan, Lea Wessel, Cristiano M. Chiessi, Jeroen Groeneveld, Patrick Monien, Douglas Lessa, Raphael Morard
Summary: This study addressed the complex effects of cryptic diversity and encrustation on the geochemical signal interpretation of the planktonic foraminifera Globorotalia inflata. It found significant influence of encrustation on delta O-18 and Mg/Ca in specimens from different genotypes, indicating a temperature-independent difference between crust and lamellar calcite. Additionally, the variable effect of crust on delta O-18 suggests advective mixing of specimens from different temperature areas rather than vertical migration.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Multidisciplinary Sciences
Paul N. Pearson, Luke Penny
Summary: The coiling fluctuations in planktonic foraminifers may be caused by cryptic populations replacing one another in competitive sweeps, a mode of evolution that is more often associated with asexual organisms.
Article
Geosciences, Multidisciplinary
Giulia Margaritelli, Fabrizio Lirer, Katrin Schroeder, Angela Cloke-Hayes, Antonio Caruso, Lucilla Capotondi, Teresa Broggy, Isabel Cacho, Francisco J. Sierro
Summary: The planktonic foraminiferal species Globorotalia truncatulinoides is widely used as a biostratigraphic proxy for the Quaternary in the Mediterranean region. The significant increase in its abundance during the Middle Holocene suggests its potential as a marker for the Middle-Late Holocene chronostratigraphic subdivision.
Article
Geography, Physical
Thomas L. Weiss, Braddock K. Linsley, Arnold L. Gordon
Summary: The study shows that the meridional migration of the bifurcation latitude of the Pacific North Equatorial Current (NEC) influences the strength of the Kuroshio Current in the western tropical Pacific and controls the thermocline salinity of the Sulu Sea. By analyzing isotopic and elemental data from foraminifera in sediment cores from the Sulu Sea, past changes in thermocline salinity and NEC bifurcation latitude shifts have been identified over the last 20-5 thousand years.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Engineering, Marine
Oleg I. Podymov, Vladimir V. Ocherednik, Ksenia P. Silvestrova, Andrei G. Zatsepin
Summary: This paper analyzes the quasiperiodic upwellings and downwellings on the shelf and upper part of the continental slope in the northeastern Black Sea. The processes are found to be related to changes in the intensity and direction of the alongshore current and the subsequent geostrophic adjustment of the density field. The source of these changes is the meandering of the Black Sea Rim Current, which leads to a quasiperiodic change in the alongshore current direction.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Jack G. Murphy, Anne-Sofie C. Ahm, Peter K. Swart, John A. Higgins
Summary: The records of lithium isotopic composition in seawater preserved in shallow-marine carbonate sediments are valuable for studying the links between silicate weathering, clay formation, global carbon cycle, and Earth's climate over geological time. This study presents measurements of lithium isotopic composition in Neogene shallow-marine carbonates and demonstrates the effects of mineralogy and diagenetic alteration on the variability of bulk sediment δ Li-7 values. The findings suggest that robust 'snapshots' of seawater δ Li-7 values in the past can be obtained from shallow-water marine carbonate sediments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Qianwei Song, Bingbin Qin, Zheng Tang, Yanguang Liu, Zhihua Chen, Jingteng Guo, Zhifang Xiong, Tiegang Li
Summary: This study utilized an improved method to measure the size-normalized weight of Neogloboquadrina pachyderma (sin.) and found that the calcification of this species is mainly controlled by temperature, which may have a positive impact on atmospheric CO2 levels.
SCIENCE CHINA-EARTH SCIENCES
(2022)
Article
Environmental Sciences
Min Zhang, Qi Shu, Chang Zhao, Gang Wang, Yuanling Zhang, Yuhuan Xue, Zhenya Song, Zhaohua Wu, Fangli Qiao
Summary: The study found that the decadal variability in the tropical Pacific has a characteristic of propagating from the western Pacific to the eastern Pacific, and it is closely related to the western wind anomalies and the Pacific decadal oscillation. It also exhibits a nonlinear response during strong El Nino-Southern Oscillation (ENSO) events.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Evolutionary Biology
Sarah Bank, Thomas R. Buckley, Thies H. Buscher, Joachim Bresseel, Jerome Constant, Mayk De Haan, Daniel Dittmar, Holger Drager, Rafhiah S. Kahar, Albert Kang, Bruno Kneubuhler, Shelley S. Langton-Myers, Sven Bradler
Summary: Stick and leaf insects are large terrestrial herbivorous arthropods known for disguising themselves as plant parts. Their evolutionary history is shaped by convergent evolution and adaptive radiations, leading to morphological and ecological diversity among different lineages.
SYSTEMATIC ENTOMOLOGY
(2021)
Article
Geochemistry & Geophysics
J. Escuder-Viruete, M. Castillo-Carrion, F. Perez Valera, P. Valverde-Vaquero, A. Rubio Ordonez, F. J. Fernandez
Summary: The Rio Boba mafic-ultramafic plutonic sequence in northern Dominican Republic represents the lower crust of the Caribbean island arc. It is formed by cumulate rocks derived from tholeiitic magmas with low H2O content. The magmatic evolution involves multi-stage processes, including decompressional melting of a refractory mantle source and enrichment by a hydrous fluid derived from a subducting slab and/or overlying sediments.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Review
Cardiac & Cardiovascular Systems
Philipp Lauten, Lisa C. Costello-Boerrigter, Bjoern Goebel, David Gonzalez-Lopez, Matthias Schreiber, Thomas Kuntze, Mahmoud Al Jassem, Harald Lapp
Summary: Transcatheter aortic valve implantation (TAVI) is a safe and effective therapy for severe aortic stenosis, and its indications have expanded. Post-TAVI conduction abnormalities remain a concern, and careful planning and measurements are needed to optimize the procedure and minimize the risk of cardiac conduction system damage. This review discusses important factors such as pre- and post-procedural conduction blocks, telemetry and ambulatory device monitoring, predictors for PPI, and techniques to optimize TAVI planning.
JOURNAL OF CARDIOVASCULAR DEVELOPMENT AND DISEASE
(2023)
Article
Geosciences, Multidisciplinary
Bryan C. Lougheed, Stephen P. Obrochta, Conny Lenz, Anette Mellstrom, Brett Metcalfe, Raimund Muscheler, Maja Reinholdsson, Ian Snowball, Lovisa Zillen
Article
Ecology
Deborah Wall-Palmer, Brett Metcalfe, Melanie J. Leng, Hilary J. Sloane, Gerald Ganssen, P. N. Vinayachandran, Christopher W. Smart
MARINE ECOLOGY PROGRESS SERIES
(2018)
Article
Ecology
Deborah Wall-Palmer, Brett Metcalfe, Melanie J. Leng, Hilary J. Sloane, Gerald Ganssen, P. N. Vinayachandran, Christopher W. Smart
MARINE ECOLOGY PROGRESS SERIES
(2018)
Article
Multidisciplinary Sciences
David W. Sims, Andrew M. Reynolds, Nicolas E. Humphries, Emily J. Southall, Victoria J. Wearmouth, Brett Metcalfe, Richard J. Twitchett
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2014)
Article
Geosciences, Multidisciplinary
Allison Y. Hsiang, Anieke Brombacher, Marina C. Rillo, Maryline J. Mleneck-Vautravers, Stephen Conn, Sian Lordsmith, Anna Jentzen, Michael J. Henehan, Brett Metcalfe, Isabel S. Fenton, Bridget S. Wade, Lyndsey Fox, Julie Meilland, Catherine Davis, Ulrike Baranowskils, Jeroen Groeneveld, Kirsty M. Edgar, Aurore Movellan, Tracy Aze, Harry J. Dowsett, C. Giles Miller, Nelson Rios, Pincelli M. Hull
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2019)
Article
Biochemical Research Methods
Hubert B. Vonhof, Stefan de Graaf, Howard J. Spero, Ralf Schiebel, Suzan J. A. Verdegaal, Brett Metcalfe, Gerald H. Haug
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
(2020)
Article
Ecology
Bryan C. Lougheed, Brett Metcalfe
Summary: This study evaluates the effectiveness of discrete-depth individual foraminifera analysis (IFA) for reconstructing past sea surface temperature (SST) variability. The results show that the IFA-derived SST reconstructions are sensitive to variables such as temperature, foraminifera species response to temperature, depositional processes, and laboratory processes. The study also highlights the noise and poor correlation in SST reconstructions when sample size is small, machine error is large, and bioturbation depth is significant.
Article
Geosciences, Multidisciplinary
Brett Metcalfe, Bryan C. Lougheed, Claire Waelbroeck, Didier M. Roche
CLIMATE OF THE PAST
(2020)
Article
Geosciences, Multidisciplinary
Geert-Jan A. Brummer, Brett Metcalfe, Wouter Feldmeijer, Maarten Arnoud Prins, Jasmijn van 't Hoff, Gerald M. Ganssen
CLIMATE OF THE PAST
(2020)
Article
Geosciences, Multidisciplinary
Brett Metcalfe, Wouter Feldmeijer, Gerald M. Ganssen
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2019)
Article
Ecology
Hilde Pracht, Brett Metcalfe, Frank J. C. Peeters
Article
Geosciences, Multidisciplinary
Didier M. Roche, Claire Waelbroeck, Brett Metcalfe, Thibaut Caley
GEOSCIENTIFIC MODEL DEVELOPMENT
(2018)
Article
Geosciences, Multidisciplinary
Bryan C. Lougheed, Brett Metcalfe, Ulysses S. Ninnemann, Lukas Wacker
CLIMATE OF THE PAST
(2018)
Article
Ecology
B. Metcalfe, W. Feldmeijer, M. de Vringer-Picon, G-J. A. Brummer, F. J. C. Peeters, G. M. Ganssen