Death Of Coral Reefs

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Transcript

  • 1. Power Point by Sharon and Rita
  • 2. Pretty isn’t it?
  • 3. Not so much anymore
  • 4. What are coral reefs?
    • coral reefs have been around us for more than 400 million years
    • Coral are extremely ancient animals that evolved into reef-building forms over the last 25 million years
    • There are two main types of coral:
      • The hard coral, the major reef-building species
      • The soft coral, such as sea whips and sea fans.
  • 5. How are they made?
    • They are aragonite structures produced by living organisms.
    • coral reefs are formed by the aggregation of the calcium carbonate exoskeletons of corals
  • 6. What are the threats?
    • Human activity is one of the greatest threats.
    • Other threats are:
      • Global warming
      • coral mining
      • pollution
      • over-fishing
      • blast fishing
  • 7. The Threat of Human Destruction
    • Coral is damaged by anchors
    • Blast fishing will kill coral reefs
    • This is due to inappropriate fishing techniques
  • 8. The Threat of Seaweed
    • Corals overgrown by seaweed
    • Caused by:
      • Over-fertilization
      • Sewage
      • Agriculture
  • 9. The Threat of Coral Bleaching
    • Coral turns white
    • This is due to:
      • High temperatures
      • Climate Change
  • 10. What happens to dead reefs?
    • They become white in colour and collapse
    • It deprives fish of food
    • Fish diversity is cut in half
  • 11. How to Help
    • Install Moorings
    • Remove nutrients from sewage
    • More efficient ways to fertilize
    • Reduce green house gasses
  • 12. Thank you for watching