Why is the Great Barrier Reef important to the marine ecosystem?

The Great Barrier Reef is a vital marine ecosystem, serving as the largest reef complex globally and a habitat for an astonishing variety of life. It is home to at least 450 species of hard coral, over 1,500 species of fish, sea turtles, sea snakes, and numerous other marine animals. This rich biodiversity is sustained by the reef's unique structure, formed over millions of years by coral polyps and algae. The reef's health is intrinsically linked to the symbiotic relationship between coral and zooxanthellae algae, which are crucial for coral survival and provide the foundation for this complex ecosystem.12