Articles | Volume 19, issue 4
https://doi.org/10.5194/bg-19-1047-2022
https://doi.org/10.5194/bg-19-1047-2022
Research article
 | 
17 Feb 2022
Research article |  | 17 Feb 2022

Growth rate rather than temperature affects the B∕Ca ratio in the calcareous red alga Lithothamnion corallioides

Giulia Piazza, Valentina A. Bracchi, Antonio Langone, Agostino N. Meroni, and Daniela Basso

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Cited articles

Adey, W. H.: The genus Clathromorphum (Corallinaceae) in the Gulf of Maine, Hydrobiologia, 26, 539–573, https://doi.org/10.1007/BF00045545, 1965. 
Adey, W. H. and McKibbin, D.: Studies on the maerl species Phymatolithon calcareum (Pallas) nov. comb. and Lithothamnion coralloides Crouan in the Ria de Vigo, Bot. Mar., 13, 100–106, https://doi.org/10.1515/botm.1970.13.2.100, 1970. 
Allen, K. A., Hönisch, B., Eggins, S. M., and Rosenthal, Y.: Environmental controls on B/Ca in calcite tests of the tropical planktic foraminifer species Globigerinoides ruber and Globigerinoides sacculifer, Earth Planet. Sc. Lett., 351, 270–280, https://doi.org/10.1016/j.epsl.2012.07.004, 2012. 
Anagnostou, E., Williams, B., Westfield, I., Foster, G. L., and Ries, J. B.: Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments, Geochim. Cosmochim. Ac., 254, 142–155, https://doi.org/10.1016/j.gca.2019.03.015, 2019. 
Andersson, A. J. and Mackenzie, F. T.: Technical comment on Kroeker et al. (2010) Meta-analysis reveals negative yet variable effects of ocean acidification on marine organisms, Ecol. Lett., 13, 1419–1434, https://doi.org/10.1111/j.1461-0248.2011.01646.x, 2011. 
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Short summary
The coralline alga Lithothamnion corallioides is widely distributed in the Mediterranean Sea and NE Atlantic Ocean, where it constitutes rhodolith beds, which are diversity-rich ecosystems on the seabed. The boron incorporated in the calcified thallus of coralline algae (B/Ca) can be used to trace past changes in seawater carbonate and pH. This paper suggests a non-negligible effect of algal growth rate on B/Ca, recommending caution in adopting this proxy for paleoenvironmental reconstructions.
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