BBC Learning Zone Clips

CLIP 14037

Inside a coral reef

Inside a coral reef
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Key Info
  • Inside a coral reef
  • Duration: 03:15
  • A coral reef is built, layer upon layer, by millions of tiny animals called polyps. These polyps build an intricate web of limestone on which a reef stretching many miles can be supported. Coral reefs are only found in the clear, shallow water of the tropics, where the warm water and sunlight can provide enough energy for the symbiotic algae growing inside the polyps. The algae convert the sunlight into sugars, which is then used by the polyps as food. This process forms the foundation of the complex reef ecosystem. First broadcast in the series 'The Blue Planet' in 2001.
  • Subject:

    Science

       Topic:

    Bio: Environment - Bio-diversity

  • Keywords: David Attenborough, Attenborough, reef building, coral, bio-diversity, polyps, algae, symbiosis, ecosystem, photosynthesis, food chains, food webs, primary producer, keystone species
Ideas for use in class
  • Could be used to introduce biodiversity in a habitat or how a keystone species affects the whole ecosystem.
Background details
  • Clip language : English
  • Aspect ratio : 16x9

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