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Coral Reefs.

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Coral Reefs A coral reef is an underwater ecosystem. They are the largest animal-made structures in the world. Coral reefs occur in mainly nutrient-deficient waters in tropical regions, which have warm waters of about 18-30�C. A coral is a living organism because it consumes food, excretes, breathes and reproduces. The coral has a white skeleton made up of limestone rock, which also helps to keep it rigid. Reef-building corals are brightly coloured organisms built by small animals called coral polyps. The polyp has stinging tentacles that beat backwards and forwards and hairs called triggers that help to catch the coral's food, chiefly phytoplankton (small food-producing plankton). ...read more.


Human Impact Pollution from various human sources disturbs the clarity of the water and causes it to turn cloudy, so sunlight cannot enter and the algae cannot photosynthesise. Coral is very delicate as far as temperature is concerned. So, the warming of global seas affects them. When the temperatures get relatively high, coral starts sweating and some of the algae slowly die. When the temperature gets too much high, corals expel the algae and no energy is left in it. El Nino, a weather phenomenon, caused some sea temperatures to rise so much as 5�. Many corals bleached and became white and died because their algae were expelled. ...read more.


Some divers and snorkellers have done more good than bad. Exploration of the coral reef ecosystem sometimes helps in conservation. But, lost snorkelling or diving equipment can strangle reefs. Toilet effluent and dumping of factory pollution and rubbish highly pollutes the sea. Jet ski's and speedboats can cut off corals. Sediment from construction sites also falls into the sea and affects the ecosystem. SOME INTERESTING STATISTICS: Less than 1% of the sea surface is coral. 30% of this coral is already dead. The Red Sea is 3,400 metres deep and the water comes from the Indian Ocean. Evaporation causes salt water and fresh water to mix but the salt does not evaporate. 40% of the water is salt, so lots of heat can be absorbed. In the middle of the ocean, there is no pollution. Sharks are the apex predators. ...read more.

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