A5041069138- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Methane Hydrates and Related Phenomena
- Marine and environmental studies
- Marine and coastal ecosystems
- Image Processing and 3D Reconstruction
- Paleontology and Stratigraphy of Fossils
- Pleistocene-Era Hominins and Archaeology
- Geological formations and processes
- Geological and Geophysical Studies
- Geological Modeling and Analysis
- Pacific and Southeast Asian Studies
- Microbial Community Ecology and Physiology
- Geochemistry and Geologic Mapping
- Hydrocarbon exploration and reservoir analysis
- Ocean Acidification Effects and Responses
- Genomics and Phylogenetic Studies
- Geomagnetism and Paleomagnetism Studies
- Protist diversity and phylogeny
- Identification and Quantification in Food
- Environmental DNA in Biodiversity Studies
- Species Distribution and Climate Change
- Oil Spill Detection and Mitigation
- Geochemistry and Elemental Analysis
Centre de Recherche et d’Enseignement de Géosciences de l’Environnement
2016-2025
Aix-Marseille Université
2016-2025
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2020-2025
Centre National de la Recherche Scientifique
2013-2024
Institut de Recherche pour le Développement
2011-2024
Laboratoire Méditerranéen de Préhistoire Europe Afrique
2003-2024
European Union Agency for Law Enforcement Cooperation
2024
Utrecht University
2023
Tohoku University
2023
Max Planck Institute for Chemistry
2023
Late Pleistocene changes in oceanic primary productivity along the equator Indian and Pacific oceans are revealed by quantitative nanoplankton communities preserved nine deep-sea cores. We show that variations equatorial primarily caused glacial-interglacial variability precession-controlled east-west thermocline slope of Indo-Pacific. The linked to processes similar Southern Oscillation phenomenon, they precede oxygen isotopic ratio, which indicates not result ice sheet fluctuations....
ABSTRACT The nature and extent of diversity in the plankton has fascinated scientists for over a century. Initially, discovery many new species remarkably uniform unstructured pelagic environment appeared to challenge concept ecological niches. Later, it became obvious that only fraction had been formally described, because assemblages are dominated by understudied eukaryotic lineages with small size lack clearly distinguishable morphological features. high confirmed comprehensive...
Sea surface temperature (SST) and salinity of the Western Pacific Warm Pool (WPWP) reflect global climate effects such as El Niño–Southern Oscillation phenomenon. However, reconstructions past changes in WPWP from geologic record vary depending on specific proxy used. Here we develop a multiproxy last deglaciation radiocarbon‐dated sediment core (MD97‐2138) retrieved heart WPWP. SST for 30,000 years based planktonic foraminiferal Mg/Ca ( Globigerinoides ruber sacculifer ), alkenone...
Previous genetic studies of extant planktonic foraminifera have provided evidence that the traditional, strictly morphological definition species in these organisms underestimates their biodiversity. Here, we report first case where this pattern is reversed. The modern (sub)tropical plexus Globigerinoides sacculifer characterized by large variability, which has led to proliferation taxonomic names attributed end-members within plexus. In order clarify status its morphotypes and investigate...
The use of planktonic foraminifera in paleoceanography requires taxonomic consistency and precise assessment the species biogeography. Yet, ribosomal small subunit (SSUr) DNA analyses have revealed that most modern morpho-species are composed a complex several distinct genetic types may correspond to cryptic or pseudo-cryptic species. These usually delimitated using partial sequences located at 3′end SSUrDNA, but typically based on empirical delimitation. Here, we first patristic distances...
Investigations of biodiversity, biogeography, and ecological processes rely on the identification "species" as biologically significant, natural units evolution. In this context, morphotaxonomy only provides an adequate level resolution if reproductive isolation matches morphological divergence. many groups organisms, morphologically defined species often disguise considerable genetic diversity, which may be indicative existence cryptic species. The diversity hidden by can disentangled...
Abstract Planktonic foraminifera (Rhizaria) are ubiquitous marine pelagic protists producing calcareous shells with conspicuous morphology. They play an important role in the carbon cycle, and their exceptional fossil record serves as basis for biochronostratigraphy past climate reconstructions. A major worldwide sampling effort over last two decades has resulted establishment of multiple large collections cryopreserved individual planktonic samples. Thousands 18S r DNA partial sequences...
The planktonic foraminifera genus Globigerinoides provides a prime example of species-rich in which genetic and morphological divergence are uncorrelated. To shed light on the evolutionary processes that lead to present-day diversity Globigerinoides, we investigated genetic, ecological its constituent species. We assembled global collection single-cell barcode sequences show consists eight distinct types organized five extant morphospecies. Based evidence, reassign species Globoturborotalita...
Abstract. Manual identification of foraminiferal morphospecies or morphotypes under stereo microscopes is time consuming for micropalaeontologists and not possible nonspecialists. Therefore, a long-term goal has been to automate this process improve its efficiency repeatability. Recent advances in computation hardware have seen deep convolutional neural networks emerge as the state-of-the-art technique image-based automated classification. Here, we describe method classifying large...
Sea surface temperature and oxygen isotopic records from two well‐dated Indian Ocean cores covering the last deglaciation show occurrence of periods increased salinity along route warm water transport to Atlantic Ocean, one between 18 14.5 ka other during Younger Dryas. Our results imply that these periods, salt accumulated in tropical Atlantic, creating favorable conditions for an abrupt resumption thermohaline circulation northern hemisphere warming. Furthermore, we suggest observed...
The planktonic foraminiferal morpho-species Globoconella inflata is widely used as a stratigraphic and paleoceanographic index. While G. was until now regarded single species, we show that it rather constitutes complex of two pseudo-cryptic species. Our study based on SSU ITS rDNA sequence analyses genotyping 497 individuals collected at 49 oceanic stations covering the worldwide range morpho-species. Phylogenetic unveil presence divergent genotypes. Type I inhabits transitional subtropical...
Understanding the spatial and temporal changes in phytoplankton assemblages is essential context of climate change, due to their impact on carbon burial marine food web. Here we investigate effects environmental shifts Mediterranean Sea taxonomy size structure using an AI-based approach. We analyzed two sediment trap series from northwestern between 2010 2018: one oligotrophic Ligurian other Gulf Lion, a region where deep convection occurs regularly winter. used novel deep-learning protocols...
The Indian Ocean is affected by seasonal and interannual climate variability, with large consequences on the water cycle over adjacent landmasses. northern influences African Asian monsoon systems, its variability interacts El Niño-Southern Oscillation (ENSO) in Pacific Ocean, potentially triggering Dipole (IOD) development. Future projections suggest that modes of could be enhanced under warming scenarios, but a lack past records precludes deeper understanding how change evolving...
  Growing evidence indicates a rapid expansion of the Western Pacific Warm Pool (WPWP), characterized by annual sea surface temperatures exceeding 28°C. This is seen both in area and upper ocean heat content (OHC) over past few decades, potentially increasing typhoon activity, coral bleaching. Ecological disruptions are expected if OHC continues to rise. To better understand future changes, paleo-records offer valuable insights for assessing potential scenarios. Most...
The Mediterranean Sea, a semi-enclosed basin, has experienced periodic anoxic events that resulted in sapropels—organic-rich sediment layers formed during deep-water oxygen depletion. While the main processes driving sapropel formation are understood, ecological and morphological responses of planktonic species to these extreme conditions remain largely unexplored. This study aims fill this gap by examining composition, tolerance, calcareous species, with focus on foraminifera...