publications

patent

1. patent

   Système et procédé de tri particulaire, et installation et procédé de tri et de caractérisation particulaire associés

   Ross Marchant, Thibault Garidel-Thoron, Jean-Marc Brutti, and Philippe Eloi

   Nov 2022

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   Système de tri particulaire (2) pour trier et isoler des particules d’un échantillon solide particulaire contenant des particules à l’état solide, comprenant : - un contenant de séparation (4) présentant une cavité qui est en creux et délimitée par une face de fond et une face intérieure périphérique, ou une rampe (44) de forme hélicoïdale est ménagée dans la face intérieure périphérique en montant depuis la face de fond jusqu’à une extrémité supérieure débouchant hors de la cavité ; et- un dispositif vibratoire primaire (400) accouplé au contenant de séparation pour transmettre une vibration au dit contenant de mais non limitativement, pour le tri, et le cas échéant séparation. L’invention s’applique plus particulièrement, à la caractérisation, de particules ayant une taille comprise entre environ 50 micromètres et 2 millimètres, telles que des microfossiles, comme par exemple des foraminifères, des radiolaires, des ostracodes. Figure de l’abrégé : Figure 3

working papers

1. subm

   A new method for the detection of siliceous microfossils on sediment microscope slides using convolutional neural networks

   C Godbillot, R Marchant, L Beaufort, K Leblanc, Y Gally, T.D.Q. Le, C Chevalier, and T Garidel-Thoron

   Mar 2024

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   Diatom communities preserved in sediment samples are valuable indicators for understanding the past and present dynamics of phytoplankton communities, and their response to environmental changes. These studies are traditionally achieved by counting methods using optical microscopy, a time-consuming process that requires taxonomic expertise. With the advent of automated image acquisition workflows, large image datasets can now be acquired, but raise the need for efficient preprocessing methods. Detecting diatom frustules on microscope images is a challenge due to their low relief, diverse shapes, and tendency to aggregate, which prevent the use of traditional thresholding techniques. Deep learning algorithms have the potential to resolve these challenges, more particularly for the task of object detection. Here we explore the use of a Faster R-CNN (Region-based Convolutional Neural Network) model to detect siliceous biominerals, including diatoms, in microscope images of a sediment trap series from the Mediterranean Sea. Our workflow demonstrates promising results, achieving a precision score of 0.72 and a recall score of 0.74 when applied to a test set of Mediterranean diatom images. Our model performance decreases when used to detect fragments of these microfossils; it also decreases when particles are aggregated or when images are out of focus. Microfossil detection remains high when the model is used on a microscope image set of sediments from a different oceanic basin, demonstrating its potential for application in a wide range of contemporary and paleoenvironmental studies. This automated method provides a valuable tool for analyzing complex samples, particularly for rare species under-represented in training datasets.

2. subm

   Guidelines for getting accurate automated pollen counts using YOLOv5 on real-world samples collected in the Mediterranean region

   B Gimenez, S Joannin, J Pasquet, L Beaufort, Y Gally, T Garidel-Thoron, N Combourieu-Nebout, L Bouby, S Canal, S Ivorra, B Limier, J F Terral, C Devaux, and O Peyron

   Dec 2023

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   Reconstructing current and past vegetation with pollen still relies on tedious manual detection and identification. Most recent works on automated pollen analyses have focused on classification, while the first step - detection - remains overlooked, although critical as detection errors will propagate to classification. Detection can be complex when applied on real-world samples containing many debris and pollen taxa, and pollen that can be damaged or clumped. Here, we used the popular algorithm YOLOv5 to evaluate its detection performance on pollen slides mounted directly from annual passive traps. We aim to provide comprehensive implementation guidelines: share insights on how to optimize its use for pollen studies, and how to annotate pollen to trade-off labour work and performance. We acquired with an automated microscope 1,024 images for each of 16 samples collected three consecutive years in six locations in Southern France. We trained YOLOv5 to detect pollen grains on 4,098 images containing 12,531 manually tagged and labeled grains, while testing for several strategies to build the training dataset and annotate the images. We evaluated the performance under each strategy, and analyzed the causes of the detection errors. We finally tested the most detailed annotation strategy for pollen classification on 5 taxa, and validated it with manual identification. Only 5.2% of pollen grains and Lycopodium spores (used to calibrate pollen counts) were left undetected, and 5.3% of debris were falsely detected as pollen. Undetected pollen grains had rare morphologies, were covered by debris, unfocused in the images, or cut in the images. Labeling pollen with their taxa did not improve detection, and, tagging and labeling one specific taxon decreased the annotation workload but was accurate only for morphologically specific taxa. Applying the trained YOLOv5 on images from new pollen correlated well with counts made by a palynologist. Our results complement pioneer studies on automated pollen analyses from real-world samples, as they provide common causes for detection errors, and guidelines to optimize detection. Automating pollen detection will increase the spatial and temporal resolutions of pollen studies.

3. subm

   Modern planktonic Foraminifera: migrating is not enough

   Sonia Chaabane, Thibault Garidel-Thoron, Julie Meilland, Olivier Sulpis, Thomas Chalk, Geert-Jan Brummer, P Graham Mortyn, Xavier Giraud, Hélène Howa, Nicolas Casajus, Azumi Kuroyanagi, Grégory Beaugrand, and Ralf Schiebel

   Oct 2023

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   Anthropogenic activities, in particular rising CO2 emissions, provoke ocean warming and acidification1,2, altering plankton habitats and threatening calcifying species3,4 such as planktonic Foraminifera (PF). Whether they can cope with these unprecedented rates of environmental change, through lateral migrations and vertical displacements, is unresolved. Here we show, using over a century of data from the FORCIS5 global census counts, that PF display evident poleward migratory behaviours, increasing their diversity at mid to high latitudes, and for some symbiont-barren species descending in the water column. Global PF abundance decreased by 24.24\pm0.11% over the last decades. Beyond lateral migrations6, our study uncovers intricate vertical migration patterns among PF species, presenting a nuanced understanding of their adaptive strategies. In projected temperature and carbonate saturation states for 2050 and 2100, low-latitude PF species will face physico-chemical environments that surpass their current tolerance. While these species might replace high-latitude ones through poleward shifts, this would radically alter low-latitude ecosystems. Our insights of PF adaptation during the Anthropocene reveals that ’migration is not enough’, and has broader implications for the evolution of marine biodiversity under multiple stressors.

4. subm

   Size harmonizing planktonic Foraminifera number concentrations in the water column

   Sonia Chaabane, Thibault Garidel-Thoron, Xavier Giraud, Julie Meilland, Geert-Jan Brummer, Lukas Jonkers, Mattia Greco, Graham Mortyn, Nicolas Casajus, Michal Kucera, Azumi Kuroyanagi, Hélène Howa, Fanny Monteiro, Gregory Beaugrand, and Ralf Schiebel

   Jul 2023

journal articles

1. BioRev

   The global genetic diversity of planktonic foraminifera reveals the structure of cryptic speciation in the plankton

   Raphael Morard, Kate F Darling, Tristan Cordier, Nicolas Henry, Christiane Hassenruck, Chiara Vanni, Mattia Greco, Agnes K M Weiner, Nele Vollmar, Tamara Milivojevic, Nurshan Rahman, Michael Siccha, Julie Meilland, Lukas Jonkers, Frédéric Quillévéré, Gilles Escarguel, Christophe J Douady, Thibault Garidel-Thoron, Colomban Vargas, and Michal Kucera

   Biological Reviews, Feb 2024

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   ABSTRACT The nature and extent of diversity in the plankton has fascinated scientists for over a century. Initially, the discovery of many new species in the remarkably uniform and unstructured pelagic environment appeared to challenge the concept of ecological niches. Later, it became obvious that only a fraction of plankton diversity had been formally described, because plankton assemblages are dominated by understudied eukaryotic lineages with small size that lack clearly distinguishable morphological features. The high diversity of the plankton has been confirmed by comprehensive metabarcoding surveys, but interpretation of the underlying molecular taxonomies is hindered by insufficient integration of genetic diversity with morphological taxonomy and ecological observations. Here we use planktonic foraminifera as a study model and reveal the full extent of their genetic diversity and investigate geographical and ecological patterns in their distribution. To this end, we assembled a global data set of  7600 ribosomal DNA sequences obtained from morphologically characterised individual foraminifera, established a robust molecular taxonomic framework for the observed diversity, and used it to query a global metabarcoding data set covering  1700 samples with  2.48 billion reads. This allowed us to extract and assign 1 million reads, enabling characterisation of the structure of the genetic diversity of the group across  1100 oceanic stations worldwide. Our sampling revealed the existence of, at most, 94 distinct molecular operational taxonomic units (MOTUs) at a level of divergence indicative of biological species. The genetic diversity only doubles the number of formally described species identified by morphological features. Furthermore, we observed that the allocation of genetic diversity to morphospecies is uneven. Only 16 morphospecies disguise evolutionarily significant genetic diversity, and the proportion of morphospecies that show genetic diversity increases poleward. Finally, we observe that MOTUs have a narrower geographic distribution than morphospecies and that in some cases the MOTUs belonging to the same morphospecies (cryptic species) have different environmental preferences. Overall, our analysis reveals that even in the light of global genetic sampling, planktonic foraminifera diversity is modest and finite. However, the extent and structure of the cryptic diversity reveals that genetic diversification is decoupled from morphological diversification, hinting at different mechanisms acting at different levels of divergence.

2. Front

   Surface fertilisation and organic matter delivery enhanced carbonate dissolution in the western South Atlantic

   Jaime Y. Suárez-Ibarra, Tiago M. Freire, Cristiane F. Frozza, Tainã M. L. Pinho, Sandro M. Petró, Bruna B. Dias, Thomas B. Chalk, Sonia Chaabane, Medhavi Srivastava, Karen B. Costa, Felipe A. L. Toledo, Thibault Garidel-Thoron, João C. Coimbra, and María A. G. Pivel

   Frontiers in Ecology and Evolution, Feb 2023

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   The last glacial inception was characterised by rapid changes in temperature, atmospheric pCO₂, and changes in the water mass geometry of the major ocean basins. Although several climatic feedback mechanisms have been proposed to explain the glacial/interglacial cycles witnessed in the Quaternary, the exact mechanistic responses of these processes are still under constrained. In this study we use proxies including planktonic foraminifera compositional assemblages and oxygen stable isotopes to reconstruct past changes in sea surface productivity, stratification, and carbonate dissolution. We use core SIS-249 (2,091 mbsl, western South Atlantic 30°S 47°W), spanning 30–110 thousand years ago (ka), and currently bathed by modern Northern Component Water. We test existing hypotheses suggesting that the orbital obliquity cycle modulates the biological pump in the study area. Spectral analysis run on our synthesised productivity proxies recognises a  43 kyr-cycle, related to the obliquity cycle. We propose that the enhanced productivity is produced by two mechanisms: i) the glacial upwelling of subsurface nutrient-rich waters and, ii) the continental (wind-driven dust and riverine outflows) fertilisation of the photic zone, with the latter process being obliquity-paced. We also suggest that not only the increased organic matter export but also a change in its bioavailability (from refractory to labile) led to calcium carbonate dissolution, as the degradation of the more soluble organic matter decreased the pH of the glacial bottom water, partially dissolving the calcium carbonate. Although our correlation analyses show a strong benthic-pelagic coupling through the relation between the enhanced biological pump and carbonate dissolution (ρ<0.05, r=0.80), we cannot reject the potential of corrosive Southern Component Water bathing the site during the glacial. Finally, we highlight that these processes are not mutually exclusive and that both can be modulated by the obliquity cycle.

3. GPC

   Glacial expansion of carbon-rich deep waters into the Southwestern Indian Ocean over the last 630 kyr

   José N Pérez-Asensio, Kazuyo Tachikawa, Laurence Vidal, Thibault Garidel-Thoron, Corinne Sonzogni, Abel Guihou, Pierre Deschamps, Stéphan J Jorry, and Min-Te Chen

   Glob. Planet. Change, Oct 2023

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   Oceanic carbon storage is one of the main sinks for atmospheric CO2, and thought to be the major contributing factor for CO2 drawdown during past glacial periods. Both physical and biogeochemical processes control the capacity of carbon storage in the ocean. During glacial periods of the Pleistocene the larger volume of deep-water masses of Southern Hemisphere origin in the Atlantic has been shown to promote carbon storage in the Southern Ocean. However, the latitudinal extension of this water mass in the Indian Ocean has been scarcely studied. In this study, we combine foraminiferal \epsilonNd and benthic \delta13C of two sediment cores in the southwest Indian Ocean (MD96–2077, 33°S, 3781 m water depth; MD96–2052, 19°S, 2627 m water depth), to reconstruct the spatial and temporal evolution of glacial carbon-rich deep waters in the SW Indian over the last 630 kyr. The combined use of foraminiferal \epsilonNd and benthic \delta13C allows to distinguish \delta13C changes related to water mass mixing and from respired carbon accumulation within the water masses. Nutrient-rich deep waters, which cannot be explained by the enhanced proportion of southern-sourced waters, were present at core sites deeper than 2700 m during glacial periods and extended at least until 33°S into the SW Indian Ocean. From Marine Isotope Stage (MIS) 14 to MIS 10, glacial carbon storage increased gradually until reaching its highest capacity during the extreme glacial periods MIS 12 and 10. Orbital forcing (100-kyr eccentricity, 41-kyr obliquity), restricted air-sea exchange and enhanced ocean stratification, fostered higher carbon storage during periods of relatively lower eccentricity and obliquity. Furthermore, after MIS 10, a progressive transition was observed from 100-kyr eccentricity to 41-kyr obliquity cycles in benthic \delta13C and \delta18O records of core MD96–2077 and sea-ice cover changes derived from ice-rafted debris of the Agulhas Plateau composite core site.

4. SciData

   The FORCIS database: A global census of planktonic Foraminifera from ocean waters

   Sonia Chaabane, Thibault 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, and Patrizia Ziveri

   Scientific Data, Jun 2023

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5. G-cubed

   Environmental Controls of Size Distribution of Modern Planktonic Foraminifera in the Tropical Indian Ocean

   Michael B. Adebayo, Clara T. Bolton, Ross Marchant, Franck Bassinot, Sandrine Conrod, and Thibault Garidel-Thoron

   Geochemistry Geophysics Geosystems, Apr 2023

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6. MPB

   Contamination of planktonic food webs in the Mediterranean Sea: Setting the frame for the MERITE-HIPPOCAMPE oceanographic cruise (spring 2019)

   Marc Tedetti, Jacek Tronczynski, Francois Carlotti, Marc Pagano, Sana Ben Ismail, Cherif Sammari, Malika Bel Hassen, Karine Desboeufs, Charlotte Poindron, Sandrine Chifflet, Amel Bellaaj Zouari, Moufida Abdennadher, Sirine Amri, Daniela Banaru, Lotfi Ben Abdallah, Nagib Bhairy, Ismail Boudriga, Aude Bourin, Christophe Brach-Papa, Nicolas Briant, Lea Cabrol, Cristele Chevalier, Lassaad Chouba, Sylvain Coudray, Mohamed Nejib Daly Yahia, Thibault Garidel-Thoron, Aurelie Dufour, Jean-Claude Dutay, Boris Espinasse, Pamela Fierro-Gonzalez, Michel Fornier, Nicole Garcia, Franck Giner, Catherine Guigue, Loic Guilloux, Asma Hamza, Lars-Eric Heimbuerger-Boavida, Stephanic Jacquet, Joel Knoery, Rim Lajnef, Nouha Makhlouf Belkahia, Deny Malengros, Pauline L. Martinot, Anthony Bosse, Jean-Charles Mazur, Marouan Meddeb, Benjamin Misson, Olivier Pringault, Marianne Quemeneur, Olivier Radakovitch, Patrick Raimbault, Christophe Ravel, Vincent Rossi, Chaimaa Rwawi, Asma Sakka Hlaili, Javier Angel Tesan-Onrubia, Bastien Thomas, Melilotus Thyssen, Noureddine Zaaboub, and Cedric Garnier

   Marine Pollution Bulletin, Apr 2023

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7. L&O

   Machine learning techniques to characterize functional traits of plankton from image data

   Eric C. Orenstein, Sakina-Dorothee Ayata, Frederic Maps, Erica C. Becker, Fabio Benedetti, Tristan Biard, Thibault Garidel-Thoron, Jeffrey S. Ellen, Filippo Ferrario, Sarah L. C. Giering, Tamar Guy-Haim, Laura Hoebeke, Morten Hvitfeldt Iversen, Thomas Kiorboe, Jean-Francois Lalonde, Arancha Lana, Martin Laviale, Fabien Lombard, Tom Lorimer, Severine Martini, Albin Meyer, Klas Ove Moeller, Barbara Niehoff, Mark D. Ohman, Cedric Pradalier, Jean-Baptiste Romagnan, Simon-Martin Schroeder, Virginie Sonnet, Heidi M. Sosik, Lars S. Stemmann, Michiel Stock, Tuba Terbiyik-Kurt, Nerea Valcarcel-Perez, Laure Vilgrain, Guillaume Wacquet, Anya M. Waite, and Jean-Olivier Irisson

   Limnology and Oceanography, Aug 2022

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8. Front

   The Foraminiferal Response to Climate Stressors Project: Tracking the Community Response of Planktonic Foraminifera to Historical Climate Change

   Thibault 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, and Ralf Schiebel

   Frontiers in Marine Science, May 2022

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9. ICESjms

   Linking zooplankton time series to the fossil record

   Lukas Jonkers, Julie Meilland, Marina C. Rillo, Thibault Garidel-Thoron, John A. Kitchener, and Michal Kucera

   ICES Journal of Marine Science, Apr 2022

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10. CP

    Technical note: A new automated radiolarian image acquisition, stacking, processing, segmentation and identification workflow

    Martin Tetard, Ross Marchant, Giuseppe Cortese, Yves Gally, Thibault De Garidel-Thoron, and Luc Beaufort

    Climate of the Past, Dec 2020

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11. MarGeol

    Magnetic fabric of Bengal fan sediments: Holocene record of sedimentary processes and turbidite activity from the Ganges-Brahmaputra river system

    Eva Moreno, Fabien Caroir, Lea Fournier, Kelly Fauquembergue, Sebastien Zaragosi, Ronan Joussain, Christophe Colin, Marie-Madeleine Blanc-Valleron, Francois Baudin, Thibault Garidel-Thoron, Jean Pierre Valet, and Franck Bassinot

    Marine Geology, Dec 2020

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12. JoMP

    Automated analysis of foraminifera fossil records by image classification using a convolutional neural network

    Ross Marchant, Martin Tetard, Adnya Pratiwi, Michael Adebayo, and Thibault Garidel-Thoron

    Journal of Micropaleontology, Oct 2020

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13. SciRep

    Nanoscale trace metal imprinting of biocalcification of planktic foraminifers by Toba’s super-eruption

    L. Lemelle, A. Bartolini, A. Simionovici, R. Tucoulou, W. De Nolf, F. Bassinot, and T. Garidel-Thoron

    Scientific Reports, Jul 2020

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14. C&G

    Automated recognition by multiple convolutional neural networks of modern, fossil, intact and damaged pollen grains

    Benjamin Bourel, Ross Marchant, Thibault Garidel-Thoron, Martin Tetard, Doris Barboni, Yves Gally, and Luc Beaufort

    Computers & Geosciences, Jul 2020

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15. PLOS

    Genetic and morphological divergence in the warm-water planktonic foraminifera genus Globigerinoides

    Raphael Morard, Angelina Fuellberg, Geert-Jan A. Brummer, Mattia Greco, Lukas Jonkers, Andre Wizemann, Agnes K. M. Weiner, Kate Darling, Michael Siccha, Ronan Ledevin, Hiroshi Kitazato, Thibault Garidel-Thoron, Colomban Vargas, and Michal Kucera

    PLOS One, Dec 2019

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16. RevMic

    Advances in planktonic foraminifer research: New perspectives for paleoceanography

    Ralf Schiebel, Sandi M. Smart, Anna Jentzen, Lukas Jonkers, Raphael Morard, Julie Meilland, Elisabeth Michel, Helen K. Coxall, Pincelli M. Hull, Thibault Garidel-Thoron, Tracy Aze, Frederic Quillevere, Haojia Ren, Daniel M. Sigman, Hubert B. Vonhof, Alfredo Martinez-Garcia, Michal Kucera, Jelle Bijma, Howard J. Spero, and Gerald H. Haug

    Revue de Micropaleontologie, Dec 2018

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17. Paleoc

    North Atlantic Midlatitude Surface-Circulation Changes Through the Plio-Pleistocene Intensification of Northern Hemisphere Glaciation

    Clara T. Bolton, Ian Bailey, Oliver Friedrich, Kazuyo Tachikawa, Thibault Garidel-Thoron, Laurence Vidal, Corinne Sonzogni, Gianluca Marino, Eelco J. Rohling, Marci M. Robinson, Magali Ermini, Mirjam Koch, Matthew J. Cooper, and Paul A. Wilson

    Paleoceanography and Paleoclimatology, Nov 2018

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18. Quat

    DATABASES FOR SEA SURFACE PALEOTEMPERATURE BASED ON GEOCHEMICAL PROXIES FROM MARINE SEDIMENTS: IMPLICATIONS FOR MODEL-DATA COMPARISONS

    Guillaume Leduc, Thibault Garidel-Thoron, Jerome Kaiser, Clara Bolton, and Camille Contoux

    Quaternaire, Jun 2017

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19. sysbiol

    Nomenclature for the Nameless: A Proposal for an Integrative Molecular Taxonomy of Cryptic Diversity Exemplified by Planktonic Foraminifera

    Raphael Morard, Gilles Escarguel, Agnes K. M. Weiner, Aurore Andre, Christophe J. Douady, Christopher M. Wade, Kate F. Darling, Yurika Ujiie, Heidi A. Seears, Frederic Quillevere, Thibault Garidel-Thoron, Colomban Vargas, and Michal Kucera

    Systematic Biology, Sep 2016

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20. MarEcoRes

    PFR2: a curated database of planktonic foraminifera 18S ribosomal DNA as a resource for studies of plankton ecology, biogeography and evolution

    Raphael Morard, Kate F. Darling, Frederic Mahe, Stephane Audic, Yurika Ujiie, Agnes K. M. Weiner, Aurore Andre, Heidi A. Seears, Christopher M. Wade, Frederic Quillevere, Christophe J. Douady, Gilles Escarguel, Thibault Garidel-Thoron, Michael Siccha, Michal Kucera, and Colomban Vargas

    Molecular Ecology Resources, Nov 2015

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21. Paleoc

    Progressive shoaling of the equatorial Pacific thermocline over the last eight glacial periods

    Fabienne Regoli, Thibault Garidel-Thoron, Kazuyo Tachikawa, Zhiming Jian, Liming Ye, Andre W. Droxler, Guillaume Lenoir, Michel Crucifix, Nicolas Barbarin, and Luc Beaufort

    Paleoceanography, May 2015

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22. Plos

    SSU rDNA Divergence in Planktonic Foraminifera: Molecular Taxonomy and Biogeographic Implications

    Aurore Andre, Frederic Quillevere, Raphael Morard, Yurika Ujiie, Gilles Escarguel, Colomban Vargas, Thibault Garidel-Thoron, and Christophe J. Douady

    PLOS One, Aug 2014

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23. Paleobio

    The cryptic and the apparent reversed: lack of genetic differentiation within the morphologically diverse plexus of the planktonic foraminifer Globigerinoides sacculifer

    Aurore Andre, Agnes Weiner, Frederic Quillevere, Ralf Aurahs, Raphael Morard, Christophe J. Douady, Thibault Garidel-Thoron, Gilles Escarguel, Colomban Vargas, and Michal Kucera

    Paleobiology, Win 2013

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24. Pal-3

    Ecological modeling of the temperature dependence of cryptic species of planktonic Foraminifera in the Southern Hemisphere

    Raphael Morard, Frederic Quillevere, Gilles Escarguel, Thibault Garidel-Thoron, Colomban Vargas, and Michal Kucera

    Palaeogeography Palaeoclimatology Palaeoecology, Dec 2013

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25. Pal-3

    Global scale same-specimen morpho-genetic analysis of Truncorotalia truncatulinoides: A perspective on the morphological species concept in planktonic foraminifera

    Frederic Quillevere, Raphael Morard, Gilles Escarguel, Christophe J. Douady, Yurika Ujiie, Thibault Garidel-Thoron, and Colomban Vargas

    Palaeogeography Palaeoclimatology Palaeoecology, Dec 2013

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26. eco&evo

    Longitudinal differentiation among pelagic populations in a planktic foraminifer

    Yurika Ujiie, Takahiro Asami, Thibault Garidel-Thoron, Hui Liu, Yoshiyuki Ishitani, and Colomban Vargas

    Ecology and Evolution, Jul 2012

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27. Plos

    Worldwide Genotyping in the Planktonic Foraminifer Globoconella inflata: Implications for Life History and Paleoceanography

    Raphael Morard, Frederic Quillevere, Christophe J. Douady, Colomban Vargas, Thibault Garidel-Thoron, and Gilles Escarguel

    PLOS One, Oct 2011

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28. Nature

    Sensitivity of coccolithophores to carbonate chemistry and ocean acidification

    L. Beaufort, I. Probert, T. Garidel-Thoron, E. M. Bendif, D. Ruiz-Pino, N. Metzl, C. Goyet, N. Buchet, P. Coupel, M. Grelaud, B. Rost, R. E. M. Rickaby, and C. Vargas

    Nature, Aug 2011

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29. MarMic

    Coiling dimorphism within a genetic type of the planktonic foraminifer Globorotalia truncatulinoides

    Yurika Ujiie, Thibault Garidel-Thoron, Silvia Watanabe, Peter Wiebe, and Colomban Vargas

    Marine Micropaleontology, Dec 2010

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30. MarMic

    Morphological recognition of cryptic species in the planktonic foraminifer Orbulina universa

    Raphael Morard, Frederic Quillevere, Gilles Escarguel, Yurika Ujiie, Thibault Garidel-Thoron, Richard D. Norris, and Colomban Vargas

    Marine Micropaleontology, May 2009

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31. Paleoc

    A multiproxy assessment of the western equatorial Pacific hydrography during the last 30 kyr

    Thibault Garidel-Thoron, Yair Rosenthal, Luc Beaufort, Edouard Bard, Corinne Sonzogni, and Alan C. Mix

    Paleoceanography, Jul 2007

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32. G-cubed

    Low-latitude hydrological cycle and rapid climate changes during the last deglaciation

    Camille Levi, Laurent Labeyrie, Franck Bassinot, Francois Guichard, Elsa Cortijo, Claire Waelbroeck, Nicolas Caillon, Josette Duprat, Thibault Garidel-Thoron, and Harry Elderfield

    Geochemistry Geophysics Geosystems, May 2007

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33. GPC

    Late Quaternary paleoceanography of the northwestern Pacific: Results from IMAGES program

    Yair Rosenthal, Thibault Garidel-Thoron, and Luc Beaufort

    Global and Planetary Change, Aug 2006

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34. QSR

    Evidence for multiple paleomagnetic intensity lows between 30 and 50 ka BP from a western Equatorial Pacific sedimentary sequence

    CL Blanchet, N Thouveny, and T Garidel-Thoron

    Quaternary Science Reviews, May 2006

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35. Nature

    Stable sea surface temperatures in the western Pacific warm pool over the past 1.75 million years

    T Garidel-Thoron, Y Rosenthal, F Bassinot, and L Beaufort

    Nature, Jan 2005

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36. PNAS

    Evidence for large methane releases to the atmosphere from deep-sea gas-hydrate dissociation during the last glacial episode

    T Garidel-Thoron, L Beaufort, F Bassinot, and P Henry

    Proceedings of the National Academy of Sciences of the United States of America, Jun 2004

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37. MarGeol

    Biomass burning and oceanic primary production estimates in the Sulu Sea area over the last 380 kyr and the East Asian monsoon dynamics

    L Beaufort, T Garidel-Thoron, B Linsley, D Oppo, and N Buchet

    Marine Geology, Sep 2003

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38. GPC

    Late quaternary paleoclimatology of the western equatorial Pacific

    Y Rosenthal, T De Garidel-Thoron, DW Oppo, BK Linsley, L Beaufort, F Bassinot, and A Mix

    Global and Planetary Changes, Sep 2003

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39. Paleoc

    Millennial-scale dynamics of the East Asian winter monsoon during the last 200,000 years

    T Garidel-Thoron, L Beaufort, BK Linsley, and S Dannenmann

    Paleoceanography, Oct 2001

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40. Science

    ENSO-like forcing on oceanic primary production during the Late Pleistocene

    L Beaufort, T Garidel-Thoron, AC Mix, and NG Pisias

    Science, Sep 2001

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