Observations of the tissue-skeleton interface in the scleractinian coral <Emphasis Type="Italic">Stylophora pistillata</Emphasis> |
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Authors: | E Tambutté D Allemand D Zoccola A Meibom S Lotto N Caminiti S Tambutté |
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Institution: | (1) Centre Scientifique de Monaco, Avenue Saint Martin, 98000 Monaco, Principality of Monaco;(2) UMR 1112 UNSA-INRA ROSE, Université de Nice Sophia Antipolis, Parc Valrose, BP 71, 06108 Nice Cedex 2, France;(3) Laboratoire d’Etude de la Matière Extraterrestre USM 0205 (LEME), Museum National d’Histoire Naturelle, Paris, France |
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Abstract: | Recent micro-analytical studies of coral skeletons have led to the discovery that the effects of biology on the skeletal chemical
and isotopic composition are not uniform over the skeleton. The aim of the present work was to provide histological observations
of the coral tissue at the interface with the skeleton, using Stylophora pistillata as a model, and to discuss these observations in the context of skeletal ultra-structural organization and composition. Several
important observations are reported: (1) At all scales of observation, there was a precise morphological correspondence between
the tissues and the skeleton. The morphological features of the calicoblastic ectoderm correspond exactly to the shape of
individual crystal fiber bundles in the underlying skeleton, indicating that the calicoblastic cell layer is in direct physical
contact with the skeletal surface. This is consistent with the previously observed chemical and isotopic composition of the
ultra-structural components in the skeleton. (2) The distribution and density of desmocyte cells, which anchor the calicoblastic
ectoderm to the skeletal surface, vary spatially and temporally during skeletal growth. (3) The tissue above the coenosteal
spines lack endoderm and consists only of ectodermal cell-layers separated by mesoglea. These findings have important implications
for models of vital effects in coral skeletal chemistry and isotope composition. |
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Keywords: | Calcification Calicoblastic ectoderm Zooxanthellae Microscopy-junctions Biomineralization |
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