New Delhi, April 5: Coral reefs are remarkable and vibrant structures formed on the ocean floor. They are created by tiny marine organisms over millions of years, where polyps develop into massive rocky formations. Due to their rich biodiversity, they are often referred to as the “rainforests of the sea.” Although they cover just one percent of the ocean floor, they provide shelter, food, and protection for nearly 25 percent of marine species.
These reefs not only prevent coastal erosion and protect against cyclones but also play a crucial role in the global economy through tourism and fishing. Coral reefs are essential for marine biodiversity, coastal security, and economic stability. Without their protection, marine life and coastal communities face severe threats.
Research scientists from the American space agency elaborate on their significance, explaining the differences between reefs, corals, and coral reefs. A reef is any structure that rises above the ocean floor, which can be natural or man-made. According to experts, reefs can include anything from old car tires to natural rocks.
Corals are primarily found in tropical marine areas and are formed by tiny polyps, each only a few millimeters in diameter. Each polyp has a mouth and tentacles equipped with stinging cells. A group of these polyps forms a “coral colony.” Corals are mainly divided into two categories: hard and soft. Hard corals secrete calcium carbonate to build robust structures, while soft corals are fleshy and flexible.
Coral reefs are primarily composed of the collective structure of hard corals. The world’s largest coral reef is Australia’s Great Barrier Reef, stretching over 2,300 kilometers and covering approximately 348,000 square kilometers.
Healthy coral reefs provide a home for thousands of marine species, from bacteria to sharks, groupers, snappers, and sea turtles. They act as a natural barrier during storms and cyclones, protecting coastal areas from up to 97 percent of damage. Millions of people, especially in island nations, rely on coral reefs for their livelihoods, generating income through fishing, tourism, and educational activities. Scientists are also exploring the potential of corals for developing new medicines, such as antibiotics effective against bacteria resistant to conventional drugs.
However, coral bleaching poses a severe threat to the existence of coral reefs. This process occurs when rising sea temperatures cause corals to expel tiny algae called zooxanthellae, which provide color and nutrition to the corals. The loss of these algae turns corals white, making them extremely sensitive and vulnerable. If temperatures remain elevated for extended periods, corals can die, leading to the dominance of filamentous algae, which ultimately destroys entire coral colonies.
The global bleaching event from 2023 to 2025 affected 84 percent of the world’s coral reefs, marking the most severe incident to date. According to reports, 14 percent of coral reefs have already vanished since 2009. Increasing pollution and sediment buildup also threaten reefs. Sediment clouds the water, reducing sunlight penetration, which diminishes the photosynthesis capacity of zooxanthellae.
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My name is Narendra Jijhontiya. I am an experienced content writer with several years of expertise in the field. Currently, I contribute to Daily Kiran, creating engaging and informative content across a variety of categories including TECHNOLOGY, health, travel, education, and automobiles. My goal is to deliver accurate, insightful, and captivating information through my words to help readers stay informed and empowered.
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