ABSTRACT Throughout history, mineral springs have been utilized worldwide for various purposes. In the French Massif Central, numerous mineral springs, such as the CO2-rich Ceix Spring, have been historically significant. The Ceix spring was formerly used for the manufacture of statuettes by petrifying objects. In December 2019, the spring was restored to create a natural area downstream the point of emergence (water catchment that remains confined within a small, enclosed building), including the formation of spring-associated travertines. From January 2020 to March 2021, the evolution of diatom communities was monitored during the implementation of the travertine deposit following the restoration. Four sampling sites for diatoms and water quality were selected: two points near the emergence point of the restored area (P1, P2) and two at the foot of the travertine deposit (P3, P4). A significant difference was observed between the points closest to the emergence and those on the travertines, including changes in mineralization, increased pH, and higher dissolved oxygen content. Regarding diatoms, the community composition between points P1, P2 (e.g. Amphora copulata, Diploneis krammeri, Fallacia pygmaea) and points P3, P4 (e.g. Craticula halophila, Cymbella hantzschiana, Mastogloia lacustris) showed a statistically significant difference, indicating that water quality primarily controlled the diatom community composition.
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