Raman spectra obtained at different skeletal region of the tropical coral Porites sp.

Confocal Raman microscopy (CRM) mapping was used to investigate the microstructural arrangement and organic matrix distribution within the skeleton of the coral Porites lutea. Relative changes in the crystallographic orientation of crystals within the fibrous fan-system could be mapped, without the...

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Bibliographic Details
Main Authors: Wall, Marlene, Nehrke, Gernot
Format: Dataset
Language:English
Published: PANGAEA 2015
Subjects:
Adaman_Sea_coral_reefs
BIOACID
Biological Impacts of Ocean Acidification
Burma Sea
Andaman Sea
Counts
EPOCA
European Project on Ocean Acidification
Event label
Figure
Mediterranean Sea Acidification in a Changing Climate
MedSeA
Sample code/label
Wave number
Ocean acidification
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.842759
https://doi.org/10.1594/PANGAEA.842759
Description
Summary:Confocal Raman microscopy (CRM) mapping was used to investigate the microstructural arrangement and organic matrix distribution within the skeleton of the coral Porites lutea. Relative changes in the crystallographic orientation of crystals within the fibrous fan-system could be mapped, without the need to prepare thin sections, as required if this information is obtained by polarized light microscopy. Simultaneously, incremental growth lines can be visualized without the necessity of etching and hence alteration of sample surface. Using these methods two types of growth lines could be identified: one corresponds to the well-known incremental growth layers, whereas the second type of growth lines resemble denticle finger-like structures (most likely traces of former spines or skeletal surfaces). We hypothesize that these lines represent the outer skeletal surface before another growth cycle of elongation, infilling and thickening of skeletal areas continues. We show that CRM mapping with high spatial resolution can significantly improve our understanding of the micro-structural arrangement and growth patterns in coral skeletons.

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