Explosive pupfish evolution

See:

http://www.sciencedaily.com/releases/2011/04/110427101530.htm

Article reads: If the evolution of all pupfish is like a steadily expanding cloud, Martin found that the San Salvador Island and Yucatan pupfish are like bursts of fireworks within it. They show explosive rates of evolution — changing up to 130 times faster than other pupfish, he said.

But is this gradual natural selection?

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