Articles | Volume 20, issue 14
https://doi.org/10.5194/bg-20-3027-2023
https://doi.org/10.5194/bg-20-3027-2023
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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Cited articles

Agbaje, O. B. A., Wirth, R., Morales, L. F. G., Shirai, K., Kosnik, M., Watanabe, T., and Jacob, D. E.: Architecture of crossed-lamellar bivalve shells: the southern giant clam (Tridacna derasa, Röding, 1798), R. Soc. Open Sci., 4, 170622, https://doi.org/10.1098/rsos.170622, 2017. 
Al-Aasm, I. S. and Veizer, J.: Diagenetic stabilization of aragonite and low-Mg calcite, I. Trace elements in rudists, J. Sediment. Res., 56, 138–152, 1986a. 
Al-Aasm, I. S. and Veizer, J.: Diagenetic stabilization of aragonite and low-Mg calcite, II. Stable isotopes in rudists, J. Sediment. Res., 56, 763–770, 1986b. 
Al-Najjar, T., Badran, M. I., Richter, C., Meyerhoefer, M., and Sommer, U.: Seasonal dynamics of phytoplankton in the Gulf of Aqaba, Red Sea, Hydrobiologia, 579, 69–83, https://doi.org/10.1007/s10750-006-0365-z, 2007. 
Al-Taani, A. A., Rashdan, M., and Khashashneh, S.: Atmospheric dry deposition of mineral dust to the Gulf of Aqaba, Red Sea: Rate and trace elements, Mar. Pollut. Bull., 92, 252–258, https://doi.org/10.1016/j.marpolbul.2014.11.047, 2015. 
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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.
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