Oysters Are 'Functionally Extinct'

The Huffington Post excerpt

A recent study published in BioScience has shown that the mollusks, 
declared "functionally extinct," are disappearing quickly as 
85 percent of their reefs have been destroyed through disease or over-harvesting, 
according to the AFP. 75 percent of the remaining wild oysters can be found in 5 locations in North America.
So what does "functionally extinct" mean?
Oysters no longer play almost any significant role in their ecosystems.

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