EFFECTS OF MALATHION ON SURVIVAL, GROWTH, DEVELOPMENT, AND EQUILIBRIUM POSTURE OF BULLFROG TADPOLES(RANA CATESBEIANA)

摘要

Bullfrog(Rana catesbeiana)tadpoles were exposed to malathion in water in a 28-d static renewal test. The effects of malathion on survival, growth, development, and loss of equilibrium posture were determined. Survival was significantly decreased at malathion concentrations of 2,500 μg/L and higher. Development of tadpoles was delayed significantly by malathion exposure as indicated by a dose-related decrease in developmental stage over time. Development of tadpoles in the 1,000-μg/L and higher treatment groups was significantly delayed from that observed in the control.