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.
Snorkelling in the Great Barrier Reef. How did it happen? Rising water temperature â the result of climate change â was the main culprit. A sustained period of warmed water caused corals to expel their photosynthetic organisms, leaving them colour-drained and brittle â the phenomenon known as bleaching.