La relation symbiotique. Elsevier Science. Archived PDF from the original on 14 April While most of a corals diet is obtained from zooxanthellae, they can also 'fish' for food too. Rivaling old growth forests in longevity of their ecological communities, well-developed reefs reflect thousands of years of history Turgeon and Asch, in press. They are the only extant organisms known to build reef-like structures in cold water.
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Subsequent development produces a tiny larvaknown as a planula. Population explosions of these predators can result in a reef being covered with tens of thousands of these starfish, with most of the coral killed in less than a year. Oceans and seas around the world are inhabited by great life forms and fascinating attractions. Many different kinds of stressors can cause coral bleaching — water that is too cold or too hot, too much or too little light, or the dilution of seawater by lots of fresh water can all cause coral bleaching. Pesticides used in farming are made up of heavy metals such as lead, mercury, arsenic and other toxins are released into the wider environment due to erosion of farm soil, which has a detrimental effect on the coral.