Death Of Coral Reefs

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Death Of Coral Reefs

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

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