| sensitivity to urea fertilization in three amphibian species. | forest fertilization with granular urea is a well-established management practice in many forested regions of the world. we hypothesize that chemical forest fertilizers may be affecting forest-dwelling wildlife. in the laboratory, we studied the effects of fertilization doses of granular urea on three species of forest-dwelling amphibians (plethodon vehiculum, rhyacotriton variegatus, and taricha granulosa). in avoidance experiments, the three species avoided a substrate treated with a dose of 2 ... | 2001 | 11443373 |