Task nr 3: Guppy lab

When the biologist John Endler observed wild guppies in Trinidad in the 1970s, he was puzzled by the fact that male guppies exhibited a wide variation in physical appearance depending on which part of a stream they lived in. Male guppies in one part of a stream had many colourful spots on their sides, whereas male guppies in another location were relatively dull and showed only a few spots. Something must have been responsible for causing these variations.

Please formulate a conclusion that is supported by experiments with the virtual laboratory.

If the average number of spots per male guppy the initial number of guppies the female preference for spotted male guppies the number of predators in the environment increases, then the average number of spots per male guppy the initial number of guppies the female preference for spotted male guppies the number of predators in the environment decreases.