Research NewsEvolution

Predator-Free Guppies Take an Evolutionary Leap Forward

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Science  28 Mar 1997:
Vol. 275, Issue 5308, pp. 1880
DOI: 10.1126/science.275.5308.1880

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It's a rare biologist who manages to catch a glimpse of evolution happening in the wild, but on (page 1934)page 1934 of this issue, researchers report just such a case in Trinidadian guppies. When moved to predator-free pools, the fish grew larger and reached sexual maturity later, all in the space of 4 to 7 years—showing that evolution can sometimes move at top speed.