Articles | Volume 20, issue 14
Research article
28 Jul 2023
Research article |  | 28 Jul 2023

Ultradian rhythms in shell composition of photosymbiotic and non-photosymbiotic mollusks

Niels J. de Winter, Daniel Killam, Lukas Fröhlich, Lennart de Nooijer, Wim Boer, Bernd R. Schöne, Julien Thébault, and Gert-Jan Reichart


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Discussed (final revised paper)

Latest update: 26 Feb 2024
Short summary
Mollusk shells are valuable recorders of climate and environmental changes of the past down to a daily resolution. To explore this potential, we measured changes in the composition of shells of two types of bivalves recorded at the hourly scale: the king scallop Pecten maximus and giant clams (Tridacna) that engaged in photosymbiosis. We find that photosymbiosis produces more day–night fluctuation in shell chemistry but that most of the variation is not periodic, perhaps recording weather.
Final-revised paper