In Morin's competition experiment, ponds contained tadpoles of three species and a species of newt. Newts in increasing numbers were added to ponds containing the tadpoles. How did the number of newts affect competition among tadpoles?

Question

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Morin found that as the number of newts in ponds increased, the outcome of competition between the tadpole species was reversed. Initially, one species was dominant over the others, but as newt predation increased, the dominant species was more vulnerable to predation and the less dominant species increased in abundance. This demonstrates that predation by newts can alter the outcome of competition among tadpoles.

In Morin's Competition Experiment, Ponds Contained Tadpoles of Three Species