Frigid polar oceans, not balmy coral reefs, are species-formation hot spots

Tropical oceans teem with the dazzle and flash of colorful reef fishes and contain far more species than the cold ocean waters found at high latitudes. This well-known 'latitudinal diversity gradient' is one of the most famous patterns in biology, and scientists have puzzled over its causes for more than 200 years.

from Oceanography News -- ScienceDaily https://ift.tt/2Kwz5fk
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