Articles | Volume 31, issue 1
https://doi.org/10.1144/0262-821X10-026
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.1144/0262-821X10-026
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
New species of Neogene radiolarians from the Southern Ocean
Johan Renaudie
Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung an der Humboldt-Universität zu Berlin, Invalidenstraße 43, 10115 Berlin, Germany
David B. Lazarus
Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung an der Humboldt-Universität zu Berlin, Invalidenstraße 43, 10115 Berlin, Germany
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This study evaluates the use of automatic classification using AI on eight closely related radiolarian species of the genus Podocyrtis based on MobileNet CNN. Species belonging to Podocyrtis are useful for middle Eocene biostratigraphy. Numerous images of Podocyrtis species from the tropical Atlantic Ocean were used to train and validate the CNN. An overall accuracy of about 91 % was obtained. Additional Podocyrtis specimens from other ocean realms were used to test the predictive model.
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Our ability to reconstruct the marine planktonic diatom early Paleogene history is hampered by decreased preservation as well as by observation bias. Collecting new diatom data in various Paleocene samples from legacy deep-sea sediment sections allows us to correct for the latter. The results show that the Paleocene deep-sea diatoms seem in fact as diverse and abundant as in the later Eocene while exhibiting very substantial survivorship of Cretaceous species up until the Eocene.
Johan Renaudie
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Marine planktonic diatoms are today both the main silica and carbon exporter to the deep sea. However, 50 million years ago, radiolarians were the main silica exporter and diatoms were a rare, geographically restricted group. Quantification of their rise to dominance suggest that diatom abundance is primarily controlled by the continental weathering and has a negative feedback, observable on a geological timescale, on the carbon cycle.
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Cécile Figus, Or M. Bialik, Andrey Yu. Gladenkov, Tatyana V. Oreshkina, Johan Renaudie, Pavel Smirnov, and Jakub Witkowski
EGUsphere, https://doi.org/10.5194/egusphere-2024-2229, https://doi.org/10.5194/egusphere-2024-2229, 2024
Short summary
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Global scale compilation of Palaeogene diatomite occurrences reveals the impact of palaeogeographic and palaeoceanographic changes on diatom accumulation, particularly in the middle Eocene: diatomite deposition dropped in epicontinental seas between ~46 and ~43 Ma, while diatoms began to accumulate from ~43.5 Ma in open ocean settings. The compilation also shows the indirect correlation between Palaeogene climate fluctuations & diatomite deposition in shallow marine and freshwater environments.
Gabrielle Rodrigues de Faria, David Lazarus, Johan Renaudie, Jessica Stammeier, Volkan Özen, and Ulrich Struck
Clim. Past, 20, 1327–1348, https://doi.org/10.5194/cp-20-1327-2024, https://doi.org/10.5194/cp-20-1327-2024, 2024
Short summary
Short summary
Export productivity is part of the global carbon cycle, influencing the climate system via biological pump. About 34 million years ago, the Earth's climate experienced a climate transition from a greenhouse state to an icehouse state with the onset of ice sheets in Antarctica. Our study shows important productivity events in the Southern Ocean preceding this climatic shift. Our findings strongly indicate that the biological pump potentially played an important role in that past climate change.
Johan Renaudie and David B. Lazarus
EGUsphere, https://doi.org/10.5194/egusphere-2023-3087, https://doi.org/10.5194/egusphere-2023-3087, 2024
Short summary
Short summary
We provide a new compilation of rates at which sediments deposited in the deep sea over the last 70 million years. We highlight a bias, linked to the drilling process, that makes it more likely for high rates to be recovered for younger sediments than for older ones. Correcting for this bias, the record show, contrary to previous estimates, a more stable history, thus providing some insights on the past mismatch between physico-chemical model estimates and observations.
Clément Coiffard, Haytham El Atfy, Johan Renaudie, Robert Bussert, and Dieter Uhl
Biogeosciences, 20, 1145–1154, https://doi.org/10.5194/bg-20-1145-2023, https://doi.org/10.5194/bg-20-1145-2023, 2023
Short summary
Short summary
Eighty-million-year-old fossil leaf assemblages suggest a widespread distribution of tropical rainforest in northeastern Africa.
Veronica Carlsson, Taniel Danelian, Pierre Boulet, Philippe Devienne, Aurelien Laforge, and Johan Renaudie
J. Micropalaeontol., 41, 165–182, https://doi.org/10.5194/jm-41-165-2022, https://doi.org/10.5194/jm-41-165-2022, 2022
Short summary
Short summary
This study evaluates the use of automatic classification using AI on eight closely related radiolarian species of the genus Podocyrtis based on MobileNet CNN. Species belonging to Podocyrtis are useful for middle Eocene biostratigraphy. Numerous images of Podocyrtis species from the tropical Atlantic Ocean were used to train and validate the CNN. An overall accuracy of about 91 % was obtained. Additional Podocyrtis specimens from other ocean realms were used to test the predictive model.
Johan Renaudie, Effi-Laura Drews, and Simon Böhne
Foss. Rec., 21, 183–205, https://doi.org/10.5194/fr-21-183-2018, https://doi.org/10.5194/fr-21-183-2018, 2018
Short summary
Short summary
Our ability to reconstruct the marine planktonic diatom early Paleogene history is hampered by decreased preservation as well as by observation bias. Collecting new diatom data in various Paleocene samples from legacy deep-sea sediment sections allows us to correct for the latter. The results show that the Paleocene deep-sea diatoms seem in fact as diverse and abundant as in the later Eocene while exhibiting very substantial survivorship of Cretaceous species up until the Eocene.
Johan Renaudie
Biogeosciences, 13, 6003–6014, https://doi.org/10.5194/bg-13-6003-2016, https://doi.org/10.5194/bg-13-6003-2016, 2016
Short summary
Short summary
Marine planktonic diatoms are today both the main silica and carbon exporter to the deep sea. However, 50 million years ago, radiolarians were the main silica exporter and diatoms were a rare, geographically restricted group. Quantification of their rise to dominance suggest that diatom abundance is primarily controlled by the continental weathering and has a negative feedback, observable on a geological timescale, on the carbon cycle.
Johan Renaudie and David B. Lazarus
J. Micropalaeontol., 35, 26–53, https://doi.org/10.1144/jmpaleo2014-026, https://doi.org/10.1144/jmpaleo2014-026, 2016
Johan Renaudie and David B. Lazarus
J. Micropalaeontol., 32, 59–86, https://doi.org/10.1144/jmpaleo2011-025, https://doi.org/10.1144/jmpaleo2011-025, 2013
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