Mussel larvae modify calcifying fluid carbonate chemistry to promote calcification.

Ramesh, Kirti, Hu, Marian Yong-An, Thomsen, Jörn, Bleich, Markus and Melzner, Frank (2017) Mussel larvae modify calcifying fluid carbonate chemistry to promote calcification. Open Access Nature Communications, 8 (1). Art.No. 1709 (2017). DOI 10.1038/s41467-017-01806-8.

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Abstract

Understanding mollusk calcification sensitivity to ocean acidification (OA) requires a better knowledge of calcification mechanisms. Especially in rapidly calcifying larval stages, mechanisms of shell formation are largely unexplored—yet these are the most vulnerable life stages. Here we find rapid generation of crystalline shell material in mussel larvae. We find no evidence for intracellular CaCO3 formation, indicating that mineral formation could be constrained to the calcifying space beneath the shell. Using microelectrodes we show that larvae can increase pH and [CO32−] beneath the growing shell, leading to a ~1.5-fold elevation in calcium carbonate saturation state (Ωarag). Larvae exposed to OA exhibit a drop in pH, [CO32−] and Ωarag at the site of calcification, which correlates with decreased shell growth, and, eventually, shell dissolution. Our findings help explain why bivalve larvae can form shells under moderate acidification scenarios and provide a direct link between ocean carbonate chemistry and larval calcification rate.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/605051
Keywords: Biogeochemistry; Marine biology
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R08
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/s41467-017-01806-8
ISSN: 2041-1723
Projects: CACHE, Future Ocean, microsensors 70090/06
Expeditions/Models/Experiments:
Date Deposited: 11 Dec 2017 08:26
Last Modified: 24 May 2019 09:48
URI: http://oceanrep.geomar.de/id/eprint/40502

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