I though I would bring out an issue that does not seem to have much attention shown upon it. The bleaching of coral reefs. Bleaching is when corals expell their zooantelae (the photosynthetic organisms that live in corals) turning the coral pretty much white. The coral the dies becaus it has lost its food source. There are a few theories concerning why this occurs. (It will occur across a reef across species and genera at the same time). One theory is water temp increases. This can be shown in a lab to cause isolated bleaching, but it usually does not affect all the test organisms. Another is polution (predominately organo-phosphates). This too can cause isolated bleaching, but not systemic bleaching.
There are trees that produce warning pheromones when they are swarmed by insects that casue the other trees (of the same species) do something (I can not seem to remember and can not find a source..

) that makes them less appetizing to the swarming insects. Could this be a possiblity, a pheromonal responce to the stress?
Any oner ideas?