Why do reefs need sunlight

Though it varies largely on geography and the species of coral, many reef-building corals have a narrow temperature range in which they can thrive. That said, research has shown that corals can adapt to moderate rising ocean temperatures if they are healthy. Many coral reef animals play important roles within coral reef ecosystems.

For example, herbivores like parrotfish and sea turtles graze on algae and help keep algae populations under control. This energy is created by algae lifeforms that live within the coral to feed the coral polyps. Once fed, the polyps release what the algae feed on—carbon dioxide. Often, they will also catch microscopic plankton from their surroundings to further sustain themselves. The proper amount of light is key to keeping a coral specimen thriving in its environment.

This is the reason why corals naturally grow in the ocean shallows, where they have greater access to the sunlight. Corals also require water circulation around them, as this helps maintain a replenishing food source and keeps the water a steady temperature.

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Your email. Click here to learn more. Coral polyps, which are animals, and zooxanthellae, the plant cells that live within them, have a mutualistic relationship. Coral polyps produce carbon dioxide and water as byproducts of cellular respiration. The zooxanthellae cells use carbon dioxide and water to carry out photosynthesis. Learn more.

Tiny plant cells called zooxanthellae live within most types of coral polyps. They help the coral survive by providing it with food resulting from photosynthesis. In turn, the coral polyps provide the cells with a protected environment and the nutrients they need to carry out photosynthesis. Home Education Corals Zooxanthellae. Corals Tutorial. Welcome What are Corals?

Zooxanthellae What's That?