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A modern scleractinian coral with a two-component calcite–aragonite skeleton

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dc.abstract.enOne of the most conserved traits in the evolution of biomineralizing organisms is the taxon-specific selection of skeletal minerals. All modern scleractinian corals are thought to produce skeletons exclusively of the calcium-carbonate polymorph aragonite. Despite strong fluctuations in ocean chemistry (notably the Mg/Ca ratio), this feature is believed to be conserved throughout the coral fossil record, spanning more than 240 million years. Only one example, the Cretaceous scleractinian coral Coelosmilia (ca. 70 to 65 Ma), is thought to have produced a calcitic skeleton. Here, we report that the modern asymbiotic scleractinian coral Paraconotrochus antarcticus living in the Southern Ocean forms a two-component carbonate skeleton, with an inner structure made of high-Mg calcite and an outer structure composed of aragonite. P. antarcticus and Cretaceous Coelosmilia skeletons share a unique microstructure indicating a close phylogenetic relationship, consistent with the early divergence of P. antarcticus within the Vacatina (i.e., Robusta) clade, estimated to have occurred in the Mesozoic (ca. 116 Mya). Scleractinian corals thus join the group of marine organisms capable of forming bimineralic structures, which requires a highly controlled biomineralization mechanism; this capability dates back at least 100 My. Due to its relatively prolonged isolation, the Southern Ocean stands out as a repository for extant marine organisms with ancient traits.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorHiggins, John A.
dc.contributor.authorMeibom, Anders
dc.contributor.authorRobinson, Laura F.
dc.contributor.authorCoronado, Ismael
dc.contributor.authorKitahara, Marcelo V.
dc.contributor.authorMurphy, Jack G.
dc.contributor.authorGothmann, Anne M.
dc.contributor.authorMarin-Carbonne, Johanna
dc.contributor.authorBouvier, Anne-Sophie
dc.contributor.authorQuattrini, Andrea M.
dc.contributor.authorTaylor, Michelle L.
dc.contributor.authorMcFadden, Catherine S.
dc.contributor.authorStolarski, Jarosław
dc.contributor.authorJaniszewska, Katarzyna
dc.contributor.authorMazur, Maciej
dc.date.accessioned2024-01-24T17:54:56Z
dc.date.available2024-01-24T17:54:56Z
dc.date.copyright2021-01-19
dc.date.issued2021
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number3
dc.description.versionFINAL_PUBLISHED
dc.description.volume118
dc.identifier.doi10.1073/PNAS.2013316117
dc.identifier.issn0027-8424
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/101679
dc.identifier.weblinkhttps://www.pnas.org/content/pnas/118/3/e2013316117.full.pdf
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofProceedings of the National Academy of Sciences of the United States of America
dc.relation.pagese2013316117
dc.rightsCC-BY-NC-ND
dc.sciencecloudnosend
dc.subject.enbiomineralization
dc.subject.encalcium carbonate
dc.subject.enscleractinian corals
dc.subject.enevolution
dc.subject.enSouthern Ocean
dc.titleA modern scleractinian coral with a two-component calcite–aragonite skeleton
dc.typeJournalArticle
dspace.entity.typePublication