The Threats to Coral Reefs

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Presentation transcript:

The Threats to Coral Reefs OCEANS ON THE EDGE 2 The Threats to Coral Reefs Key words: Coral bleaching fishing degrade tourism siltation Starter: Watch this clip – what threat to coral reefs is shown? http://www.youtube.com/watch?v=9RhX3lRJQMg Learning Objective: To be able to explain how human activities are degrading and destroying coral reefs

Complete the cut and stick activity Separate the factors which degrade/destroy coral reefs into those which are: Natural Human Natural and Human Siltation = to become filled with silt (fine material e.g. mud) El Nino = a change in ocean temperatures by natural processes every 2-7 years Coral Bleaching = warm waters cause the algae to leave the coral, so the coral stops growing and loses its colour

Watch the first 3 minutes of this clip – how is fishing damaging the reef? http://www.bbc.co.uk/learningzone/clips/the-impact-of-fishing-in-the-philippines/4692.html

Problems of fishing Subsistence fishing. But some use blast fishing! Overfishing for the far-east See page 109 of green book. Trawler fishing – highly efficient and damaging Overfishing of key species

The problems caused by fishing Copy and complete these sentences Demand in the far-east ... Most local people fish at a subsistence level using spear/traps, but others ... Trawlers use small mesh nets which ......... which is a problem because ... Trawlers also cause problems because ... Selective fishing is a problem because ... See page 109 of Green book

The problems caused by tourism Look at the diagram on page 109 of the green book. Say what you think are the 5 most damaging things to the coral reefs caused by tourism.

And finally ... Who is going to be in the hot seat?