RT Journal Article T1 From a marsh that was once sea: The geological evolution of Europe's largest biological reserve as told by its benthic foraminifera-a review A1 González-Regalado Montero, María Luz A1 Ruiz Muñoz, Francisco A1 Rodríguez Vidal, Joaquín A1 Cáceres Puro, Luis Miguel A1 Tosquella Angrill, Josep A1 Muñoz Rodríguez, Adolfo Francisco A1 Toscano Grande, Antonio A1 Gómez Gutiérrez, Paula A1 Romero Aguilar, Verónica A1 Gómez Álvarez, Gabriel AB This paper presents an updated list of benthic foraminifera found in brackish and marine (paleo-)environments ofthe Do˜nana National Park (SW Spain) from the Lower Pliocene to the present-day. This list, based on publishedrecords, includes ninety-four species whose autoecology and temporal distribution in surface sections andcontinuous sediment cores allow us to infer the palaeogeographic evolution of this Biosphere Reserve over thelast millions of years. During the Lower Pliocene, this area was occupied by a wide shallow bay with Nonion fabaand Ammonia beccarii as the most representative species. During the Upper Pliocene, there was a transition toterrestrial environments, later dominated by fluvial dynamics for much of the Pleistocene and devoid of theseaquatic microorganisms. During the Upper Pleistocene and part of the Holocene, the park was flooded during theMIS-1 transgression and a large lagoon was formed and progressively silted up. At this stage, benthic foraminiferalassemblages were dominated by the brackish species Ammonia morphogroup tepida and Haynesina germanica,which were occasionally replaced by marine species (mainly miliolids) during high-energy events.Currently, benthic foraminifera are mainly represented by Ammonia morphogroup tepida in the temporary lagoonsand distributary channels, while Ammonia beccarii is dominant in their marginal marine areas. In summary,there is a clear correspondence between the palaeogeographic evolution of the park and its benthicforaminiferal associations, a review of which contributes to increase the knowledge of its remarkable present andpast faunal diversity. PB Elsevier SN 1096-0015 YR 2025 FD 2025-01 LK https://hdl.handle.net/10272/25529 UL https://hdl.handle.net/10272/25529 LA eng NO González-Regalado, M. L., Guerra, L., Ruiz, F., Veiga-Pires, C., Abad, M., Izquierdo, T., Vidal, J. R., Cáceres, L. M., Muñiz, F., Carretero, M. I., Tosquella, J., Muñoz, A. F., Pozo, M., Muñoz, J. M., Toscano, A., Gómez, P., Romero, V., & Gómez, G. (2025). From a marsh that was once sea: The geological evolution of Europe’s largest biological reserve as told by its benthic foraminifera-a review. Estuarine, Coastal and Shelf Science (Issue 313, 109104). Elsevier. https://doi.org/10.1016/j.ecss.2024.109104 NO Funds have come from Andalusian Government (RNM-238 and RNM-293). It is a contribution to the Research Center in Historical, Cultural and Natural Heritage (CIPHCN) of the University of Huelva. DS Repositorio Institucional de la Universidad de Huelva RD 31 may 2026