Articles | Volume 21, issue 4
https://doi.org/10.5194/bg-21-911-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-21-911-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
20 Feb 2024
Research article |
| 20 Feb 2024
| 20 Feb 2024
Potential impacts of cable bacteria activity on hard-shelled benthic foraminifera: implications for their interpretation as bioindicators or paleoproxies
Maxime Daviray
CORRESPONDING AUTHOR
Univ Angers, Nantes Université, Le Mans Université, CNRS, Laboratoire de Planétologie et Géosciences, LPG UMR 6112, 49000 Angers, France
Emmanuelle Geslin
Univ Angers, Nantes Université, Le Mans Université, CNRS, Laboratoire de Planétologie et Géosciences, LPG UMR 6112, 49000 Angers, France
Nils Risgaard-Petersen
Aquatic Biology, Department of Biology, Aarhus University, 8000 Aarhus C, Denmark
Vincent V. Scholz
Center for Electromicrobiology, Department of Biology, Aarhus University, 8000 Aarhus C, Denmark
Marie Fouet
UMR CNRS 5805 EPOC – OASU, Station Marine d'Arcachon, Université de Bordeaux, CNRS, 33120 Arcachon, France
Edouard Metzger
Univ Angers, Nantes Université, Le Mans Université, CNRS, Laboratoire de Planétologie et Géosciences, LPG UMR 6112, 49000 Angers, France
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Sikandar Hayat, Meryem Mojtahid, Mary Elliot, Jorge Cardich, Emmanuelle Geslin, Thibault de Garidel-Thoron, Matthieu Carré, and Christine Barras
J. Micropalaeontol., 45, 95–116, https://doi.org/10.5194/jm-45-95-2026, https://doi.org/10.5194/jm-45-95-2026, 2026
Short summary
Short summary
We studied how artificial intelligence can speed up the study of tiny ocean organisms called benthic foraminifera, whose shells help scientists understand past ocean changes. Normally, identifying and counting them under a microscope takes a lot of time and skill. Here, we compared automated image analysis and human counting for 31 samples. The automated method showed promising results for faster and reliable research.
Constance Choquel, Emmanuelle Geslin, Edouard Metzger, Bruno Jesus, Antoine Prins, Emilie Houliez, Magali Schweizer, Thierry Jauffrais, Éric Bénéteau, and Aurélia Mouret
J. Micropalaeontol., 45, 51–72, https://doi.org/10.5194/jm-45-51-2026, https://doi.org/10.5194/jm-45-51-2026, 2026
Short summary
Short summary
We studied how tiny shelled organisms called foraminifera living in coastal mudflats respond to changes in their microscopic algae food. By monitoring a French mudflat every month for 3 years, we showed that seasonal environmental changes strongly shape both algae and foraminifera. Using simple algae traits such as size and shape explained feeding patterns better than identifying algae species, offering a clearer way to predict ecosystem responses to environmental change.
Christiane Schmidt, Emmanuelle Geslin, Joan M. Bernhard, Charlotte LeKieffre, Mette Marianne Svenning, Helene Roberge, Magali Schweizer, and Giuliana Panieri
Biogeosciences, 19, 3897–3909, https://doi.org/10.5194/bg-19-3897-2022, https://doi.org/10.5194/bg-19-3897-2022, 2022
Short summary
Short summary
This study is the first to show non-selective deposit feeding in the foraminifera Nonionella labradorica and the possible uptake of methanotrophic bacteria. We carried out a feeding experiment with a marine methanotroph to examine the ultrastructure of the cell and degradation vacuoles using transmission electron microscopy (TEM). The results revealed three putative methanotrophs at the outside of the cell/test, which could be taken up via non-targeted grazing in seeps or our experiment.
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Short summary
Coastal marine sediments are subject to major acidification processes because of climate change and human activities, but these processes can also result from biotic activity. We studied the sediment acidifcation effect on benthic calcareous foraminifera in intertidal mudflats. The strong pH decrease in sediments probably caused by cable bacteria led to calcareous test dissolution of living and dead foraminifera, threatening the test preservation and their robustness as environmental proxies.
Coastal marine sediments are subject to major acidification processes because of climate change...
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