Sclerites of the soft coral Ovabunda macrospiculata (Xeniidae) are predominantly the metastable CaCO
Calcium carbonate
Coral reefs
Energy dispersive spectroscopy
High-resolution powder X-ray diffraction
Micro-Raman spectroscopy
Red Sea
Scanning electron microscopy
Soft corals
Journal
Acta biomaterialia
ISSN: 1878-7568
Titre abrégé: Acta Biomater
Pays: England
ID NLM: 101233144
Informations de publication
Date de publication:
11 2021
11 2021
Historique:
received:
07
06
2021
revised:
24
08
2021
accepted:
29
08
2021
pubmed:
8
9
2021
medline:
17
11
2021
entrez:
7
9
2021
Statut:
ppublish
Résumé
Soft corals (Cnidaria, Anthozoa, Octocorallia, Alcyonacea) produce internal sclerites of calcium carbonate previously shown to be composed of calcite, the most stable calcium carbonate polymorph. Here we apply multiple imaging and physical chemistry analyses to extracted and in-vivo sclerites of the abundant Red Sea soft coral, Ovabunda macrospiculata, to detail their mineralogy. We show that this species' sclerites are comprised predominantly of the less stable calcium carbonate polymorph vaterite (> 95%), with much smaller components of aragonite and calcite. Use of this mineral, which is typically considered to be metastable, by these soft corals has implications for how it is formed as well as how it will persist during the anticipated anthropogenic climate change in the coming decades. This first documentation of vaterite dominating the mineral composition of O. macrospiculata sclerites is likely just the beginning of establishing its presence in other soft corals. STATEMENT OF SIGNIFICANCE: Vaterite is typically considered to be a metastable polymorph of calcium carbonate. While calcium carbonate structures formed within the tissues of octocorals (phylum Cnidaria), have previously been reported to be composed of the more stable polymorphs aragonite and calcite, we observed that vaterite dominates the mineralogy of sclerites of Ovabunda macrospiculata from the Red Sea. Based on electron microscopy, Raman spectroscopy, and X-ray diffraction analysis, vaterite appears to be the dominant polymorph in sclerites both in the tissue and after extraction and preservation. Although this is the first documentation of vaterite in soft coral sclerites, it likely will be found in sclerites of other related taxa as well.
Identifiants
pubmed: 34492373
pii: S1742-7061(21)00584-5
doi: 10.1016/j.actbio.2021.08.051
pmc: PMC7611992
mid: EMS134718
pii:
doi:
Substances chimiques
Minerals
0
Calcium Carbonate
H0G9379FGK
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
663-670Subventions
Organisme : European Research Council
ID : 755876
Pays : International
Informations de copyright
Copyright © 2021. Published by Elsevier Ltd.
Déclaration de conflit d'intérêts
Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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