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Selection by Predation on Albino and Normal Spadefoot Toads

Henry E. Childs, Jr.
Evolution
Vol. 7, No. 3 (Sep., 1953), pp. 228-233
DOI: 10.2307/2405733
Stable URL: http://www.jstor.org/stable/2405733
Page Count: 6
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Abstract

A population of 1,452 spadefoot toad larvae in a vernal pool contained 20% (298) of albino individuals. The evidence presented indicates that predation by the raccoon on a population of 200 larvae (100 normals, 100 albinos) left in a natural pool is probably responsible for a statistically significant reduction of the albino form. The Chi-square value for this difference is 17.0. No difference in survival through early metamorphosis was found between normals and albinos in the controls, but development in the albino form was slower in every situation studied. The albino form did not survive for breeding experiments.

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