How do algae and protozoans bind coral reef material together?

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coral reef The Great Barrier Reef, off the coast of Queensland, Australia, is the world's largest coral reef.

In the context of coral reef geology, algae and protozoans play a critical role in maintaining the structural integrity of the reef by acting as a binding and cementing agent. While corals provide the primary structural framework of the reef, various other organisms contribute fragments of calcareous material that settle into the gaps between coral colonies.

Algae and protozoans bind and cement these loose fragments and reef material together through their sheetlike growth. This process ensures that the diverse components of the reef—including skeletal remains of mollusks, echinoderms, and other calcareous organisms—are consolidated into a cohesive, rigid structure.1