A5053142396- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- French Urban and Social Studies
- Marine and coastal plant biology
- Microbial Community Ecology and Physiology
- Paleontology and Stratigraphy of Fossils
- Agriculture and Rural Development Research
- Mineralogy and Gemology Studies
- Microplastics and Plastic Pollution
- Marine and fisheries research
- Bioeconomy and Sustainability Development
- Marine Biology and Environmental Chemistry
- Marine and environmental studies
- Evolution and Paleontology Studies
- Ocean Acidification Effects and Responses
- Pacific and Southeast Asian Studies
- Hydrocarbon exploration and reservoir analysis
- Multiculturalism, Politics, Migration, Gender
- Plant and animal studies
- Geological formations and processes
- Genetic diversity and population structure
- Environmental DNA in Biodiversity Studies
Japan Agency for Marine-Earth Science and Technology
2023-2025
Université Lille Nord de France
2024
Centre National de la Recherche Scientifique
2015-2023
Laboratoire d’Océanologie et de Géosciences
2023
Université de Lille
2023
Institut de Recherche pour le Développement
2023
Laboratoire de Planétologie et Géosciences
2019-2022
Université d'Angers
2019-2021
Nantes Université
2021
Université de Bordeaux
2019
Abstract Foraminifera are ubiquitous marine protists that intracellularly accumulate phosphate 1 , an important macronutrient in ecosystems and fertilizer potentially leaked into the ocean. Intracellular concentrations can be 100–1,000 times higher than surrounding water . Here we show storage foraminifera is widespread, from tidal flats to deep sea. The total amount of intracellular stored benthic foraminifer Ammonia confertitesta Wadden Sea during a bloom as high around 5% annual...
Summary While competition is recognized as a major factor responsible for plant community dynamics, the genetics of intra‐ and interspecific competitive ability target species (i.e. level intra‐population genetic variation, identity phenotypic traits under selection bases) still deserves deeper investigation at local spatial scale by considering both numerous genotypes several interacting species. In this study, we tested whether response effect in Arabidopsis thaliana was dependent on...
Abstract Spatial distribution of water-soluble molecules and ions in living organisms is still challenging to assess. Energy-dispersive X-ray spectroscopy (EDS) via cryogenic scanning electron microscopy (cryo-SEM) one the promising methods study them without loss dissolved contents. High-resolution cryo-SEM–EDS has challenges sample preparation, including cross-section exposure drift/charging due insulative surrounding water. The former becomes problematic for large inseparable organisms,...
Calcareous benthic foraminifera can develop pores in their shells for gas exchange with seawater. Pore patterns, like porosity, pore density, and size, are influenced by environmental factors bottom water dissolved oxygen concentration (BWDO). Some foraminiferal species increase test porosity under low BWDO, making them a useful proxy reconstructing past oxygenation. The patterns BWDO is validated the Southeast Pacific (SEP) examining six compared to estimate on sediment sites. Specimens...
Abstract Calcareous benthic foraminifera commonly develop pores in their test wall for gas exchange (e.g., O 2 , CO ) with seawater. Pore patterns, that is, porosity, pore density, and size, are influenced by environmental factors like bottom water dissolved oxygen concentration (BWDO). Certain species show increased porosity under low BWDO, making them a useful proxy reconstructing past BWDO. The patterns as BWDO validated the Southeast Pacific (SEP) examining six relation to estimated on...
Abstract The high morphological variability observed in the genus Ammonia, together with its global distribution, led to description of a plethora species, subspecies, and varieties. Until now, many researchers used limited number (morpho-)species, considered numerous varieties as ecophenotypes. Recently, molecular studies show that these putative ecophenotypes are, reality, well-separated genetically should rather be separate species. This study aims investigate characteristics three...
Abstract. Foraminifera are unicellular eukaryotes known to have a shell, called test, generally made of secreted calcite (CaCO3). For the first time, we report foraminifera with composite calcite–opal test in cosmopolitan and well-studied benthic species Bolivina spissa (Rotaliida), sampled from Sagami Bay Japan at 1410 m depth. Based on comprehensive investigations including scanning electron microscopy (SEM) coupled energy-dispersive X-ray spectroscopy (EDS) Fourier-transform infrared...
Abstract. Over the last decades, hypoxia in marine coastal environments has become more and widespread, prolonged intense. Hypoxic events have large consequences for functioning of benthic ecosystems. In severe cases, they may lead to complete anoxia presence toxic sulfides sediment bottom-water, thereby strongly affecting biological compartments Within these ecosystems, foraminifera show a high diversity ecological responses, with wide range adaptive life strategies. Some species are...
Though the morphological discrimination of three pseudo-cryptic Ammonia species, A. aberdoveyensis , confertitesta and veneta has been recently established, information on their ecology habitats are still relatively scarce. This study aims to define distribution patterns these species at eight sites scattered along French coasts English Channel, over a total 39 stations. These were classified into two habitats, either harbours (heavily modified sites) or less impacted (moderately influenced...
Abstract Due to climate warming and increased anthropogenic impact, a decrease of ocean water oxygenation is expected in the near future, with major consequences for marine life. In this context, it essential develop reliable tools assess past oxygen concentrations ocean, better forecast these future changes. Recently, foraminiferal pore patterns have been proposed as bottom proxy, but parameters controlling are still largely unknown. Here we use scaling laws describe how both gas exchanges...
Abstract. Ammonia is one of the most widespread foraminiferal genera worldwide. Three phylotypes (Ammonia sp. T1, T2 and T6), commonly encountered in northeast Atlantic, are usually associated with morphospecies tepida. The biogeographic distribution these three types was previously investigated coastal environments around Great Britain based on genetic assignations. A new method recently developed to recognize morphological criteria (i.e. pore size suture elevation spiral side), avoiding...
Hypoxia and associated acidification are growing concerns for ecosystems biogeochemical cycles in the coastal zone. The northern Gulf of Mexico (nGoM) has experienced large seasonal hypoxia decades linked to eutrophication continental shelf fueled by Mississippi River nutrient discharge. Sediments play a key role maintaining hypoxic acidified bottom waters, but this is still not completely understood. In summer 2017, when surface area zone nGoM was largest ever recorded, we investigated four...
Among benthic foraminifera, the genus Ammonia is characterized by high morphological variability which makes it particularly challenging to recognize using traditional morphology-based taxonomy. Despite joint efforts made both molecular and taxonomists, still hard identify different phylotypes based on their morphology. A new method was developed recently discriminate three NE Atlantic of (T1, T2, T6). This two morphometrical parameters scanning electron microscope (SEM) images (i.e.,...
Abstract. Foraminifera are unicellular eukaryotes known to have a shell, called test, generally made of secreted calcite (CaCO3). We report for the first time having composite calcite/opal test in cosmopolitan and well-studied benthic species Bolivina spissa (Rotaliida), sampled from Sagami Bay Japan at 1410 m depth. Based on comprehensive investigations including Scanning Electron Microscopy (SEM) coupled with Energy Dispersive X-ray Spectroscopy (EDS) Fourier Transform Infrared (FTIR), we...
Calcareous benthic foraminifera can develop pores in their test wall to facilitate gas exchanges (e.g., O2, CO2) with the surrounding seawater. The patterns of these pores, i.e., porosity, pore density, and size, vary based on environmental factors, including bottom water dissolved oxygen concentration (BWDO). Specifically, some species react increased porosity lower BWDO levels, highlighting proxy potential for reconstructing past concentrations. To validate this Southeast Pacific (SEP),...
Assessing the distribution of species in natural environments is essential for their use environmental surveys. Here, we investigate three pseudo-cryptic formerly lumped morphospecies Ammonia tepida (Cushman, 1926), commonly found on estuarine mudflats along European coasts: Ammoniaveneta Schultze, 1854 (T1), aberdoveyensis Haynes, 1973 (T2) and confertitesta Zheng, 1978 (T6). We studied at 51 sites located seven estuaries French North Atlantic coast (Elorn, Aulne, Odet, Crac’h, Auray,...