With roughly 24,000 species described, fish are the most diverse vertebrates on earth. Thirty to forty percent of these species are associated with tropical reefs, which cover less than 0.1% of the ocean’s surface.
How did such incredible diversity arise in such a small geographic area? From an evolutionary perspective, it is fascinating to ask how species and populations are related, and what factors influence those relationships. How, how, how are there so many species on reefs? A plethora of new questions burst from that one, on and on.
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