Current thinking on how the Toxoplasma gondii parasite invades its host is incorrect, according to a study published today in Nature Methods describing a new technique to knock out genes. The findings could have implications ...
Definition. Coral bleaching is a process whereby the coral colonies lose their colour, either due to the loss of pigments by microscopic algae (zooxanthellae) living in symbiosis with their host organisms (polyps), or because these zooxanthellae have been expelled.
Fast Facts: The World's Largest & Most Extensive Coral Reef System. 1  The Great Barrier Reef is the largest and most extensive coral reef system in the world comprising about 2900 individual coral reefs, 600 continental islands and 300 coral cays. 2  It represents approximately 10% of all coral reefs in the world.