Article
Environmental Sciences
Natalie Chernihovsky, Adi Torfstein, Ahuva Almogi-Labin
Summary: The shells of planktonic foraminifera (PF) make up a significant part of the carbon flux in the global oceans and serve as an important record of ocean history. However, limited understanding of their life cycles and biological rhythms hampers their use as palaeoceanographic proxies. This study presents the flux and shell-size distributions of ten PF species at a daily timescale resolution in the Gulf of Aqaba, providing insights into their generation cycles.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Marine & Freshwater Biology
Julie Meilland, Mohamed M. Ezat, Adele WestgArd, Clara Manno, RaphaEl Morard, Michael Siccha, Michal Kucera
Summary: This study explores the reproductive strategy of polar planktonic foraminifera and reveals the importance of asexual reproduction for rapid population growth in polar oceans.
JOURNAL OF PLANKTON RESEARCH
(2023)
Article
Geochemistry & Geophysics
Zhoufei Yu, Baohua Li, Hongliang Li, Jingling Zhang, Jianfang Chen
Summary: This study investigates the seasonal calcification depth variations of four common species of planktonic foraminifera by analyzing their stable oxygen isotope composition. The findings show that the depth habitat change affects the calcite 818O on seasonal timescales, and the seasonal depth habitat follows the isothermals. The research also proposes a new approach for quantifying the effect of seasonal calcification depth changes on the 818O signature of planktonic foraminiferal tests.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Maria Caezare Mae R. Carino, Alyssa M. Peleo-Alampay, Martin G. Wiesner, Leopoldo P. de Silva, Niko Lahajnar, Christian Betzler, Ibrahim Fikree, Thomas Luedmann
Summary: This study investigates the seasonal changes in planktonic foraminifera fluxes during the Asian Monsoon in the Maldives. The results show that nutrient-rich conditions during the monsoon periods lead to higher planktonic foraminifera fluxes. The dominant species vary with the monsoon direction, with shallow-dwelling species dominating during the NE monsoon and deep-water species dominating during the SW monsoon.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Environmental Sciences
P. Kiss, L. Jonkers, N. Hudackova, R. T. Reuter, B. Donner, G. Fischer, M. Kucera
Summary: Planktonic foraminifera play a crucial role in the marine calcite budget and CO2 uptake. Shell flux is a key factor in regulating calcite flux variability on intra-annual timescales, while shell mass variability can be as important as shell flux on inter-annual timescales.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Chemistry, Physical
Andrea Simion, Tobias Schubeis, Tanguy Le Marchand, Mihai Vasilescu, Guido Pintacuda, Anne Lesage, Claudiu Filip
Summary: A new heteronuclear decoupling pulse sequence called ROSPAC is introduced, which enhances decoupling efficiency by using a large pattern of radio-frequencies and minimizing cross-effects. ROSPAC performs well for a wide range of chemical shifts and low radio-frequency powers, making it suitable for ultra-fast magic-angle spinning (MAS) conditions.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Geosciences, Multidisciplinary
Hui-Ling Lin, Hon-Kit Lui, Tai-Chun Lin, You-Lin Wang
Summary: Foraminifera play a crucial role in the carbon cycle and paleoclimatology. This study examines the responses of foraminifera to climate and seawater chemistry changes at the South China Sea. The results show that the winter monsoon and El Nino-Southern Oscillation have significant impacts on foraminiferal productivity and fluxes.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Multidisciplinary Sciences
Che-Hung Lin, Shunichi Takahashi, Aziz J. Mulla, Yoko Nozawa
Summary: Moonlight has been shown to suppress coral spawning, with spawning typically occurring 5 days after shading. Laboratory experiments demonstrate that a dark period between day-light and night-light conditions can eliminate the suppressive effect of night-light on spawning. The period of darkness between sunset and moonrise during the lunar cycle triggers synchronized mass spawning of corals in nature.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Keiran A. Swart, Sergey Oleynik, Alfredo Martinez-Garcia, Gerald H. Haug, Daniel M. Sigman
Summary: By using foraminifera-bound organic matter (FBOM) delta C-13 as a potential proxy for dissolved CO2 concentration, researchers have achieved higher precision testing with new protocols and instruments. They found an inverse correlation between FBOM-delta C-13 and surface water [CO2(aq)], indicating the potential for FBOM-delta C-13 to serve as a paleoceanographic proxy for atmospheric pCO2.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Environmental Sciences
Natalia A. Belkina, Natalia V. Kulik, Natalia A. Efremenko, Maxim S. Potakhin, Vyacheslav I. Kukharev, Aleksandr V. Ryabinkin, Roman E. Zdorovennov, Andrey P. Georgiev, Vera D. Strakhovenko, Ekaterina V. Gatalskaya, Irina Yu. Kravchenko, Anna V. Ludikova, Dmitry A. Subetto
Summary: The spatio-temporal variability of sedimentation process in Lake Onego, the second largest lake in Europe, was evaluated and the chemical composition of the lake water was studied. It was demonstrated that the sedimentation process in the lake is non-uniform, with different regions of the lake having different sedimentation rates. The composition of the deposited material suggests a humus-Fe-Si type of sedimentation, which is influenced by natural factors and unevenly distributed anthropogenic pressure.
Article
Ecology
Tomas Cedhagen, Jane Marianne Mamuaja, Lars Chresten Lund-Hansen
Summary: Foraminiferans, such as Ammonia cf. aomoriensis, influence sediment surface roughness and stability through the construction of sediment coverings using pseudopods. Experimental use of colchicine to destroy pseudopodia showed that sediment stability was increased, as destroyed pseudopodia were unable to form sediment structures. The activity of pseudopodial network can affect bacterial populations and the production of EPS, further stabilizing the sediment.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Haruka Takagi, Katsunori Kimoto, Tetsuichi Fujiki
Summary: Photosymbiosis is a key feature in planktonic foraminifera, where a single host can have thousands of symbiont cells, making photosynthesis a hotspot for primary production. Understanding the photosynthetic activities of symbionts is crucial for interpreting geochemical proxies recorded in foraminiferal tests. The relationship between the fluorescence-based photosynthetic rate and carbon assimilation rate was studied in two species, showing a significant positive correlation but different regression slopes. The high apparent electron requirement for carbon assimilation observed may be due to the use of respiratory carbon.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Michael Knappertsbusch, Jean Eisenecker
Summary: Morphometric shell measurements are important for understanding the evolutionary patterns of planktonic foraminifera. The development of the Automated Measurement system for shell mORphology (AMOR) has greatly improved the efficiency of collecting and analyzing morphometric data from these organisms. Recent improvements have expanded the capabilities of AMOR to include more diverse foraminiferal species.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Thibault de Garidel-Thoron, Sonia Chaabane, Xavier Giraud, Julie Meilland, Lukas Jonkers, Michal Kucera, Geert-Jan A. Brummer, Maria Grigoratou, Fanny M. Monteiro, Mattia Greco, P. Graham Mortyn, Azumi Kuroyanagi, Helene Howa, Gregory Beaugrand, Ralf Schiebel
Summary: Planktonic Foraminifera are marine protozoa that secrete calcareous shells, which provide a geological record of past changes in their community structure. The FORCIS project aims to create a global database to analyze the distribution and turnover of these organisms.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Economics
Raffaele Mattera, Philip Hans Franses
Summary: This paper investigates the business cycle synchronization in Africa using a novel spatio-temporal hierarchical approach. The findings suggest that the Economic Community of West African States (ECOWAS) and the Common Monetary Area (CMA) are feasible monetary unions, while the Central Africa CFA and the East African Monetary Union (EAMU) are not supported.
ECONOMIC MODELLING
(2023)
Article
Geology
Thiago P. Santos, Fellippe R. A. Bione, Igor M. Venancio, Marcelo C. Bernardes, Andre L. Belem, Luana P. Lisboa, Daniel R. Franco, Rut A. Diaz, Manuel Moreira, Noele F. Leonardo, Igor Souza, Andre L. D. Spigolon, Ana Luiza S. Albuquerque
Summary: Cyclostratigraphy reveals the quasi-periodic nature of sedimentary successions globally. A study using geophysical and geochemical data analysis developed an astronomical time scale and inferred the relation between sedimentation rate and TOC accumulation. Results show pervasive orbitally-driven forcing imprint, which can be used to build high-resolution chronology for Brazilian marginal basins.
CRETACEOUS RESEARCH
(2022)
Article
Multidisciplinary Sciences
C. G. Leandro, J. F. Savian, M. V. L. Kochhann, D. R. Franco, R. Coccioni, F. Frontalini, S. Gardin, L. Jovane, M. Figueiredo, L. R. Tedeschi, L. Janikian, R. P. Almeida, R. I. F. Trindade
Summary: This study presents a cyclostratigraphic evaluation of a high-resolution multiproxy dataset to establish an astronomically-tuned age model that provides new constraints for the Aptian climato-chronostratigraphic framework.
NATURE COMMUNICATIONS
(2022)
Article
Biodiversity Conservation
Peter Kiss, Natalia Hudackova, Jurgen Titschack, Michael G. R. Siccha, Zuzana Hermanova, Lorand Silye, Andrej Ruman, Samuel Rybar, Michal Kucera
Summary: The evolution of a complex character in two different species suggests the influence of a common environmental factor.
Article
Geography, Physical
Joana F. Cruz, Ioanna Bouloubassi, Arnaud Huguet, Alice M. S. Rodrigues, Thiago P. Santos, Igor M. Venancio, Douglas Lessa, Rodrigo L. Sobrinho, Rodrigo A. Nascimento, Marcelo C. Bernardes
Summary: This study reconstructed the upper temperature variations in the Subtropical South-western Atlantic (SSWA) using organic proxies. The results showed similar patterns in sea temperature records derived from alkenone-based UK'37 and isoprenoid glycerol dialkyl glycerol tetraethers (isoGDGTs)-based TEXH86 proxies. The study suggests that the joint use of these proxies is a promising approach to estimating paleoceanographic changes in the upper thermocline.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geology
Thiago P. Santos, Luana P. Lisboa, Victor Carreira, Fellippe R. A. Bione, Igor M. Venancio, Marcelo C. Bernardes, Andre L. Belem, Rut A. Diaz, Manuel Moreira, Alexandre A. O. Lopes, Tulio L. Santos, Igor V. Souza, Andre L. D. Spigolon, Ana Luiza S. Albuquerque
Summary: In the past 66 million years, Earth has experienced dramatic climate changes, shifting from a warm greenhouse to a cold icehouse with polar ice caps. Geological records show that this transition caused significant long-term sea-level and atmospheric CO2 decline, influenced by orbital motions. However, the impact of these oscillations on the Brazilian margin is largely unknown.
Article
Multidisciplinary Sciences
Sonia Chaabane, Thibault de Garidel-Thoron, Xavier Giraud, Ralf Schiebel, Gregory Beaugrand, Geert-Jan Brummer, Nicolas Casajus, Mattia Greco, Maria Grigoratou, Helene Howa, Lukas Jonkers, Michal Kucera, Azumi Kuroyanagi, Julie Meilland, Fanny Monteiro, Graham Mortyn, Ahuva Almogi-Labin, Hirofumi Asahi, Simona Avnaim-Katav, Franck Bassinot, Catherine V. Davis, David B. Field, Ivan Hernandez-Almeida, Barak Herut, Graham Hosie, Will Howard, Anna Jentzen, David G. Johns, Lloyd Keigwin, John Kitchener, Karen E. Kohfeld, Douglas V. O. Lessa, Clara Manno, Margarita Marchant, Siri Ofstad, Joseph D. Ortiz, Alexandra Post, Andres Rigual-Hernandez, Marina C. Rillo, Karen Robinson, Takuya Sagawa, Francisco Sierro, Kunio T. Takahashi, Adi Torfstein, Igor Venancio, Makoto Yamasaki, Patrizia Ziveri
Summary: Planktonic Foraminifera, with their excellent fossil record, serve as unique paleo-environmental indicators. Their distribution and diversity are influenced by various environmental factors, including anthropogenic ocean and climate change. However, the historical changes in their distribution at the global scale have not been thoroughly assessed until now. In this study, the FORCIS database is presented, which includes data on the diversity and distribution of Foraminifera in the global ocean from 1910 to 2018, incorporating both published and unpublished data.
Article
Geography, Physical
Aurelio F. Silva, Thiago P. Santos, Pedro L. A. Xavier, Norberto Dani, Cesar L. Schultz, Marcus V. D. Remus, Ruy P. Philipp, Raysa M. Rocha, Daniel R. Franco, Marco Antonio L. da Silva
Summary: The study presents the first astronomical time scale for the Irati-Whitehill Sea in the late Paleozoic, providing a more precise duration for the formation. The deposition pattern of the Irati Formation is strongly modulated by long and short eccentricity cycles.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Multidisciplinary Sciences
Michael Siccha, Raphael Morard, Julie Meilland, Shinya Iwasaki, Michal Kucera, Katsunori Kimoto
Summary: This study used x-ray micro computed tomography to reconstruct three-dimensional images of 179 specimens of calcite shells of planktic foraminifera. The images provide a basis for further research on species' functional ecology, calcification intensity, and phylogenetic relationships.
Article
Multidisciplinary Sciences
Doron Pinko, Sigal Abramovich, Eyal Rahav, Natalia Belkin, Maxim Rubin-Blum, Michal Kucera, Raphael Morard, Maria Holzmann, Uri Abdu
Summary: Kleptoplasty, the sequestration of chloroplasts, has been discovered in the miliolid clade species Hauerina diversa, expanding the known distribution of this phenomenon. The functionality of the observed chloroplasts within the foraminiferal cytoplasm was confirmed through genetic analysis. Furthermore, the study suggests a relationship between kleptoplastic foraminifera and symbiotic foraminifera, as evidenced by phylogenetic analysis and the common ancestry of alveolinid symbionts and kleptoplasts.
Article
Geosciences, Multidisciplinary
Allana Queiroz de Azevedo, Francisco J. Jimenez-Espejo, Francesca Bulian, Francisco J. Sierro, Deborah Tangunan, Yasuhiro Takashimizu, Ana Luiza S. Albuquerque, Kaoru Kubota, Carlota Escutia, Richard D. Norris, Sidney R. Hemming, Ian R. Hall
Summary: This article investigates the Southern African monsoon during the late Miocene-early Pliocene period in southern Africa. By analyzing elemental geochemistry, stable isotopes, and marine sediment data, the dynamics of the monsoon were reconstructed. The study found that the expansion of the Antarctic ice sheet had a significant impact on the monsoon.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Geosciences, Multidisciplinary
A. Bahr, A. Jaeschke, A. Hou, K. Meier, C. M. Chiessi, A. L. Spadano Albuquerque, J. Rethemeyer, O. Friedrich
Summary: The accurate reconstruction of sea-surface temperatures is crucial for understanding the global climate system. In this study, we investigate the fidelity of SST reconstructions for the western tropical South Atlantic during Marine Isotope Stages 6-5. Our results show that previous SST estimates based on Mg/Ca ratios of planktic foraminifera are supported by alkenone-based temperature estimates, suggesting a warm-water anomaly during MIS 6. However, TEX86-derived temperatures are colder, potentially due to the vertical migration of the TEX86 producers.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Ecology
Pauline Cornuault, Thomas Westerhold, Heiko Paelike, Torsten Bickert, Karl-Heinz Baumann, Michal Kucera
Summary: Marine plankton is an important part of the global carbon cycle. This study re-evaluates Neogene pelagic sediments in the tropical Atlantic and reveals significant orbital-scale variability in carbonate accumulation. It suggests that long-term changes in pelagic carbonate production are primarily controlled by orbital cycles in the tropical ocean.
Article
Geosciences, Multidisciplinary
Braun Natalia Santos, Ciro Climaco Rodrigues, Daniel Ribeiro Franco, Mingsong Li, Mariana Aragao Fernandes, Mariane Candido, Raysa de Magalhaes Rocha, Thiago Pereira dos Santos, Andre De Gasperi, Daniel Galvao Carnier Fragoso, Gabriella Fazio, Ana Natalia Gomes Rodrigues
Summary: This study integrates seismic reflectors interpretation, a biostratigraphic framework, and astronomic age models to provide a high-resolution chronostratigraphy of the Miocene deposits in the Albacora Field, Campos Basin, Brazil. The study also refines age estimates for seismic reflectors and suggests the presence of the Miocene Optimum Climate and significant eustatic falls in the studied section.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Igor M. Venancio, Thiago P. Santos, Fellippe R. A. Bione, Andre L. Belem, Marcelo C. Bernardes, Rut A. Diaz, Manuel Moreira, Victor Carreira, Andre Spigolon, Igor Souza, Ana Luiza S. Albuquerque
Summary: Through analysis of geochemical data from multiple wells in the Espirito Santo Basin, it was found that there is better organic carbon preservation during oceanic anoxic events, with OAE1d showing better preservation compared to OAE2. The amount of preserved carbon could reach up to 8.6% during OAE1d, which is crucial for organic carbon and source rock modeling studies.