Effect of Acute Exposure to Malathion and Lead on Sprint Performance of the Western Fence Lizard ( Sceloporus occidentalis )

摘要: There are few ecotoxicological studies involving reptiles, despite the fact that anthropogenic pollutants have been identified as a major threat to reptile populations worldwide. Particularly lacking effects-based in reptiles exposed known concentrations of contaminants. We hypothesized acute exposure neurotoxic metals and pesticides could influence locomotor performance reptiles. To test this hypothesis, we western fence lizards (Sceloporus occidentalis) two common widely studied contaminants, malathion lead (Pb). Single doses were administered via oral gavage at order-of-magnitude levels ranging from 0.2 200 1.0 1,000 mg/kg (body weight basis) for Pb, respectively. Lizard sprint velocity was determined using 2.3-m track interfaced with laptop computer 24 hrs prior dosing again 4, 24, 120, 312 post-dose. Twenty percent 30% mortality occurred highest Pb dose (200 1000 mg/kg) 70% exhibited clinical symptoms organophosphate poisoning. Contrary our predictions, had no effect on performance, concentration increased velocity. Based lower most ecologically relevant velocity, suggest other parameters require fine skills (e.g., climbing ability) may be more sensitive metrics neurotoxicity warrant further study.