Guppies were moved from stream A,with a fish that preyed upon adult guppies,to stream B,with a fish that preyed upon juvenile guppies.After 30 to 60 generations,the guppies responded to the increased predation on juveniles relative to adults by

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The guppies increased the age at which they matured in response to the increased predation on juveniles relative to adults. This is because individuals who mature later may be larger and better able to avoid predation, while younger and smaller individuals are more vulnerable. This trait was likely selected for over time, resulting in a population of guppies that mature later than their ancestors in an effort to avoid predation.

Guppies Were Moved from Stream A,with a Fish That Preyed