Coral Reefs Support Quarter Of Marine Life

The incredible biodiversity of coral (Deals) reefs stems from their unique nature as living, three-dimensional structures. The architects of these massive underwater cities are tiny animals called coral polyps. Each polyp lives in a symbiotic partnership with microscopic algae called zooxanthellae that reside within its tissues. The algae photosynthesize, providing the coral with up to 90% of its energy, which in turn allows the polyps to secrete hard, calcium carbonate skeletons. This powerful partnership allows reefs to flourish in tropical waters that are often surprisingly low in nutrients.

Over thousands of years, the slow accumulation of these skeletons builds the vast, complex formations we recognize as reefs. This intricate structure is the key to supporting so much life. It creates a maze of caves, tunnels, and ledges that provide countless niches for other organisms. These spaces serve as crucial nurseries for juvenile fish, hiding spots from predators, and anchor points for sponges and anemones. By creating a physical foundation (Review) and concentrating energy at the base of the food web, this small fraction of the ocean floor becomes an essential hub for an immense variety of marine species.