Correlative geochemical imaging of Desmophyllum dianthus reveals biomineralisation strategy as a key coral vital effect.

Autor: Standish CD; School of Ocean and Earth Sciences, National Oceanography Centre, University of Southampton, European Way, Southampton, SO14 3ZH, UK. c.d.standish@soton.ac.uk., Trend J; School of Ocean and Earth Sciences, National Oceanography Centre, University of Southampton, European Way, Southampton, SO14 3ZH, UK., Kleboe J; Department of Chemistry and Institute for Life Sciences, University of Southampton, Highfield Campus, University Road, Southampton, SO17 1BJ, UK., Chalk TB; School of Ocean and Earth Sciences, National Oceanography Centre, University of Southampton, European Way, Southampton, SO14 3ZH, UK.; Aix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, France., Mahajan S; Department of Chemistry and Institute for Life Sciences, University of Southampton, Highfield Campus, University Road, Southampton, SO17 1BJ, UK., Milton JA; School of Ocean and Earth Sciences, National Oceanography Centre, University of Southampton, European Way, Southampton, SO14 3ZH, UK., Page TM; School of Ocean and Earth Sciences, National Oceanography Centre, University of Southampton, European Way, Southampton, SO14 3ZH, UK., Robinson LF; School of Earth Sciences, University of Bristol, Queens Road, Bristol, BS8 1RJ, UK., Stewart JA; School of Earth Sciences, University of Bristol, Queens Road, Bristol, BS8 1RJ, UK., Foster GL; School of Ocean and Earth Sciences, National Oceanography Centre, University of Southampton, European Way, Southampton, SO14 3ZH, UK.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 May 15; Vol. 14 (1), pp. 11121. Date of Electronic Publication: 2024 May 15.
DOI: 10.1038/s41598-024-61772-2
Abstrakt: The chemical and isotopic composition of stony coral skeletons form an important archive of past climate. However, these reconstructions are largely based on empirical relationships often complicated by "vital effects" arising from uncertain physiological processes of the coral holobiont. The skeletons of deep-sea corals, such as Desmophyllum dianthus, are characterised by micron-scale or larger geochemical heterogeneity associated with: (1) centres of calcification (COCs) where nucleation of new skeleton begins, and (2) fibres that thicken the skeleton. These features are difficult to sample cleanly using traditional techniques, resulting in uncertainty surrounding both the causes of geochemical differences and their influence on environmental signals. Here we combine optical, and in-situ chemical and isotopic, imaging tools across a range of spatial resolutions (~ 100 nm to 10 s of μm) in a correlative multimodal imaging (CMI) approach to isolate the microstructural geochemistry of each component. This reveals COCs are characterised by higher organic content, Mg, Li and Sr and lower U, B and δ 11 B compared to fibres, reflecting the contrasting biomineralisation mechanisms employed to construct each feature. CMI is rarely applied in Environmental/Earth Sciences, but here we illustrate the power of this approach to unpick the "vital effects" in D. dianthus, and by extension, other scleractinian corals.
(© 2024. The Author(s).)
Databáze: MEDLINE
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