Climate of the Past
Climate of the Past
CP
Articles | Volume 21, issue 11
Articles | Volume 21, issue 11
https://doi.org/10.5194/cp-21-2361-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-21-2361-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 11
Research article
 | 
21 Nov 2025
Research article |  | 21 Nov 2025

Living on the edge: Response of Late Cretaceous rudist bivalves (Hippuritida) to hot and highly seasonal climate in the low-latitude Saiwan site, Oman

Niels J. de Winter, Najat al Fudhaili, Iris Arndt, Philippe Claeys, René Fraaije, Steven Goderis, John Jagt, Matthias López Correa, Axel Munnecke, Jarosław Stolarski, and Martin Ziegler

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Short summary
To test the tolerance of past shallow marine ecosystems to extreme climates, we collected and compiled stable and clumped isotope data from rudist (Order Hippuritida) bivalves that lived in tropical shallow marine waters in present-day Oman during the Campanian (75 million years ago). Our dataset shows that these animals were able to withstand exceptionally warm temperatures, exceeding 40 °C, during hot summers. Our finding highlights how seasonal climate extremes impact marine biodiversity.
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