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.
Why does a coral change colors? In the wild, there are a number of environmental factors which cause coral bleaching (loss of color). In home reef aquariums however, the usual cause of fading coral colors isâ¦ a change in lighting. Most frequently, reef keepers observe coral bleaching with newly obtained corals.