Do poison mushrooms serve a purpose in our ecosystem?
A couple of links on Red Tide:
Some general info on Red Tide.
About Red Tide along the Texas Gulf Coast.
As usual, human activity is probably mostly responsible for overgrowth.
I wonder if it's one of those things that occur naturally to tell humans when we've done "oopsies!"
Too many "oopsies!" and it's bye-bye humankind.