A Late Pleistocene coastal ecosystem in French Guiana was hyperdiverse relative to today - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2024

A Late Pleistocene coastal ecosystem in French Guiana was hyperdiverse relative to today

Sylvain Adnet
Orangel Aguilera
Jan Fietzke
Sandrine Grouard
Martin R Langer
Javier Luque
Laurent Marivaux
Pierre Moissette
Nina H Witteveen
Alexandre Casanova
Simon Clavier
  • Fonction : Collaborateur
Philibert Bidgrain
  • Fonction : Collaborateur
Marjorie Gallay
Mathieu Rhoné
  • Fonction : Collaborateur
Arnauld Heuret
  • Fonction : co premier-auteur

Résumé

Warmer temperatures and higher sea level than today characterized the Last Interglacial interval [Pleistocene, 128 to 116 thousand years ago (ka)]. This period is a remarkable deep-time analog for temperature and sea-level conditions as projected for 2100 AD, yet there has been no evidence of fossil assemblages in the equatorial Atlantic. Here, we report foraminifer, metazoan (mollusks, bony fish, bryozoans, decapods, and sharks among others), and plant communities of coastal tropical marine and mangrove affinities, dating precisely from a ca. 130 to 115 ka time interval near the Equator, at Kourou, in French Guiana. These communities include ca. 230 recent species, some being endangered today and/or first recorded as fossils. The hyperdiverse Kourou mollusk assemblage suggests stronger affinities between Guianese and Caribbean coastal waters by the Last Interglacial than today, questioning the structuring role of the Amazon Plume on tropical Western Atlantic communities at the time. Grassland-dominated pollen, phytoliths, and charcoals from younger deposits in the same sections attest to a marine retreat and dryer conditions during the onset of the last glacial (ca. 110 to 50 ka), with a savanna-dominated landscape and episodes of fire. Charcoals from the last millennia suggest human presence in a mosaic of modern-like continental habitats. Our results provide key information about the ecology and biogeography of pristine Pleistocene tropical coastal ecosystems, especially relevant regarding the—widely anthropogenic— ongoing global warming.

Domaines

Paléontologie
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Dates et versions

hal-04521033 , version 1 (26-03-2024)

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Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Pierre-Olivier Antoine, Linde N Wieringa, Sylvain Adnet, Orangel Aguilera, Stéphanie C Bodin, et al.. A Late Pleistocene coastal ecosystem in French Guiana was hyperdiverse relative to today. Proceedings of the National Academy of Sciences of the United States of America, 2024, 121 (14), pp.e2311597121. ⟨10.1073/pnas.2311597121⟩. ⟨hal-04521033⟩
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