Abstract
Tadpoles of Scaphiopus holbrooki acquire damaged tails during unsuccessful attacks by the predatory salamander Notophthalmus viridescens. The abundance of Notophthalmus stocked in artificial ponds significantly affected the frequency of caudal injuries in Scaphiopus populations. Correlations between caudal injury frequency, tadpole survival, predator abundance and predator biomass confirmed the utility of injury frequency as an indirect index of predation intensity. In this system there is a simple, negative linear relation between angularly transformed injury frequency and survival to metamorphosis. These results support a frequently assumed but previously untested positive relation between predation intensity and injury frequency in cohorts of equal-aged prey.
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