CE01 - Terre solide et enveloppes fluides

Searching for the ORigin of the DINoflagellates in the Acritarch Representatives – ORDINAR

Submission summary

The dinoflagellates are one of the three major phytoplankton groups in modern oceans. They are known since the beginning of the Mezozoic (± 250 million years ago), but what is their origin? Several Proterozoic and in particular Palaeozoic acritarchs (± 540 to 250 million years ago) that are among the first signs of life are morphologically very similar to some modern dinoflagellate cysts. In addition, the stratigraphic, paleoecological and palaeogeographical distribution of these acritarchs is very similar to that of the modern dinoflagellates. However, it remains unclear if dinoflagellates are the organisms that produced these acritarchs. Microfossils of unequivocal dinoflagellate cyst morphology are not known until the Triassic, whereas organic biomarkers and physiology suggest a much older origin.? We therefore propose to compare the ancient acritarches with fossil and modern dinoflagellate cysts. Recently, it appeared that each modern dinoflagellate cyst species has a unique macro-molecular fingerprint. Here, we will use this information on an innovative way. We will combine organic geochemistry, micro-infra-red spectroscopy, culturing and genetic techniques, and microscopic analyses (optical, TEM, SEM) to determine the biological affinities and the macromolecular characteristics of individual microfossils, including acritarchs and dinoflagellates. Our study should resolve - at least partly - the question about the origin of the dinoflagellates, and the biological affinity of the acritarchs.

Project coordination

Thomas Servais (Université de Lille (EPE))

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

Université de Lille (EPE)
UBO-GeoOcean Université de Brest
SOLEIL Synchrotron SOLEIL
ODE-UL Institut Francais de Recherche pour l'Exploitation de la Mer

Help of the ANR 437,762 euros
Beginning and duration of the scientific project: December 2022 - 48 Months

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