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Mapping coral calcification strategies from in situ boron isotope and trace element measurements of the tropical coral Siderastrea siderea

Mapping coral calcification strategies from in situ boron isotope and trace element measurements of the tropical coral Siderastrea siderea
Mapping coral calcification strategies from in situ boron isotope and trace element measurements of the tropical coral Siderastrea siderea
Boron isotopic and elemental analysis of coral aragonite can give important insights into the calcification strategies employed in coral skeletal construction. Traditional methods of analysis have limited spatial (and thus temporal) resolution, hindering attempts to unravel skeletal heterogeneity. Laser ablation mass spectrometry allows a much more refined view, and here we employ these techniques to explore boron isotope and co-varying elemental ratios in the tropical coral Siderastrea siderea. We generate two-dimensional maps of the carbonate parameters within the calcification medium that deposited the skeleton, which reveal large heterogeneities in carbonate chemistry across the macro-structure of a coral polyp. These differences have the potential to bias proxy interpretations, and indicate that different processes facilitated precipitation of different parts of the coral skeleton: the low-density columella being precipitated from a fluid with a carbonate composition closer to seawater, compared to the high-density inter-polyp walls where aragonite saturation was ~5 times that of external seawater. Therefore, the skeleton does not precipitate from a spatially homogeneous fluid and its different parts may thus have varying sensitivity to environmental stress. This offers new insights into the mechanisms behind the response of the S. siderea skeletal phenotype to ocean acidification.
2045-2322
Chalk, Thomas
0021bbe6-6ab1-4a30-8542-654d0f2d1a0a
Standish, Christopher
0b996271-da5d-4c4f-9e05-a2ec90e8561d
D'angelo, Maria
0d35b03b-684d-43aa-a57a-87212ab07ee1
Castillo, Karl D.
39eeae7b-a375-4224-b962-94901e9e0cf8
Milton, James
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Foster, Gavin
fbaa7255-7267-4443-a55e-e2a791213022
Chalk, Thomas
0021bbe6-6ab1-4a30-8542-654d0f2d1a0a
Standish, Christopher
0b996271-da5d-4c4f-9e05-a2ec90e8561d
D'angelo, Maria
0d35b03b-684d-43aa-a57a-87212ab07ee1
Castillo, Karl D.
39eeae7b-a375-4224-b962-94901e9e0cf8
Milton, James
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Foster, Gavin
fbaa7255-7267-4443-a55e-e2a791213022

Chalk, Thomas, Standish, Christopher, D'angelo, Maria, Castillo, Karl D., Milton, James and Foster, Gavin (2021) Mapping coral calcification strategies from in situ boron isotope and trace element measurements of the tropical coral Siderastrea siderea. Scientific Reports, 11 (1), [472].

Record type: Article

Abstract

Boron isotopic and elemental analysis of coral aragonite can give important insights into the calcification strategies employed in coral skeletal construction. Traditional methods of analysis have limited spatial (and thus temporal) resolution, hindering attempts to unravel skeletal heterogeneity. Laser ablation mass spectrometry allows a much more refined view, and here we employ these techniques to explore boron isotope and co-varying elemental ratios in the tropical coral Siderastrea siderea. We generate two-dimensional maps of the carbonate parameters within the calcification medium that deposited the skeleton, which reveal large heterogeneities in carbonate chemistry across the macro-structure of a coral polyp. These differences have the potential to bias proxy interpretations, and indicate that different processes facilitated precipitation of different parts of the coral skeleton: the low-density columella being precipitated from a fluid with a carbonate composition closer to seawater, compared to the high-density inter-polyp walls where aragonite saturation was ~5 times that of external seawater. Therefore, the skeleton does not precipitate from a spatially homogeneous fluid and its different parts may thus have varying sensitivity to environmental stress. This offers new insights into the mechanisms behind the response of the S. siderea skeletal phenotype to ocean acidification.

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Accepted/In Press date: 30 November 2020
Published date: 12 January 2021

Identifiers

Local EPrints ID: 447661
URI: http://eprints.soton.ac.uk/id/eprint/447661
ISSN: 2045-2322
PURE UUID: 8181b05f-b70a-4832-9659-8c0e737685b2
ORCID for Thomas Chalk: ORCID iD orcid.org/0000-0002-2880-3847
ORCID for Gavin Foster: ORCID iD orcid.org/0000-0003-3688-9668

Catalogue record

Date deposited: 18 Mar 2021 17:33
Last modified: 26 Nov 2021 03:09

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Contributors

Author: Thomas Chalk ORCID iD
Author: Maria D'angelo
Author: Karl D. Castillo
Author: James Milton
Author: Gavin Foster ORCID iD

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