Skip to Main content Skip to Navigation
Journal articles

Mineral formation in the primary polyps of pocilloporoid corals

Abstract : In reef-building corals, larval settlement and its rapid calcification provides a unique opportunity to study the bio-calcium carbonate formation mechanism involving skeleton morphological changes. Here we investigate the mineral formation of primary polyps, just after settlement, in two species of the pocilloporoid corals: Stylophora pistillata (Esper, 1797) and Pocillopora acuta (Lamarck, 1816). We show that the initial mineral phase is nascent Mg-Calcite, with rod-like morphology in P. acuta, and dumbbell morphology in S. pistillata. These structures constitute the first layer of the basal plate which is comparable to Rapid Accretion Deposits (Centers of Calcification, CoC) in adult coral skeleton. We found also that the rod-like/dumbbell Mg-Calcite structures in subsequent growth step will merge into larger aggregates by deposition of aragonite needles. Our results suggest that a biologically controlled mineralization of initial skeletal deposits occurs in three steps: first, vesicles filled with divalent ions are formed intracellularly. These vesicles are then transferred to the calcification site, forming nascent Mg-Calcite rod/pristine dumbbell structures. During the third step, aragonite crystals develop between these structures forming spherulite-like aggregates.
Complete list of metadata

https://hal.sorbonne-universite.fr/hal-03070341
Contributor : Guillaume Laurent <>
Submitted on : Tuesday, December 15, 2020 - 6:05:14 PM
Last modification on : Saturday, December 19, 2020 - 3:42:10 AM

File

2019_Neder_Mineral.pdf
Publication funded by an institution

Identifiers

Citation

Maayan Neder, Pierre Laissue, Anat Akiva, Derya Akkaynak, Marie Albéric, et al.. Mineral formation in the primary polyps of pocilloporoid corals. Acta Biomaterialia, Elsevier, 2019, 96, pp.631-645. ⟨10.1016/j.actbio.2019.07.016⟩. ⟨hal-03070341⟩

Share

Metrics

Record views

27

Files downloads

33