http://www.livescience.com/18360-ocean-fish-diversity-extinction.html
Pretty interesting. I've often wondered about diversity in sw vs. fw.... every little stream in the Amazon has it's own species, are ocean reefs the same?
The authors point out that populations' ranges are less restricted...
Check it out, very interesting article just released on possible origins of most African cichlids.
Lost African Lake Spawned Fish Diversity "Beyond Belief"