Skeleton-Forming Responses of Reef-Building Corals under Ocean Acidification

Area of Science:

• Marine Biology
• Coral Reef Ecology
• Climate Change Science

Background:

• Ocean acidification poses a significant threat to coral reefs globally.
• Understanding coral responses to reduced pH is crucial for conservation.
• Limited knowledge exists on how different coral species adapt their skeletal growth.

Purpose of the Study:

• To investigate the skeleton-forming strategies of major reef-building corals under simulated ocean acidification.
• To quantify the impact of reduced pH on coral skeletal density and composition.
• To analyze gene expression changes related to skeletal formation in corals exposed to lower pH.

Main Methods:

• Simulated acidified marine environment (pH 7.6–7.8) for four coral species.
• Reconstruction and visualization of coral skeleton formation.
• Quantification of elemental calcium loss.
• Analysis of gene expression patterns.

Main Results:

• Coral species exhibit diverse skeletal growth strategies under acidification.
• Acropora muricata displays a unique internal cavity formation, reducing skeletal density.
• Pocillopora damicornis, Montipora capricornis, and Montipora foliosa show "osteoporosis"-like changes.
• Acidification particularly damages pre-existing coral skeletal structures.

Conclusions:

• Coral adaptation to ocean acidification varies significantly by species.
• Understanding these diverse strategies is key for predicting reef futures.
• Findings provide a basis for targeted coral reef protection and restoration efforts.