Abstract
1. 1. Some parameters related to oxidative stress were studied in amphibian Discoglossus pictus tadpoles acclimated to three thermal regimes between 10 and 29°C. 2. 2. Acclimation to low temparatures produced an increase in catalase activity and a decrease in catalase thermal sensitivity which resulted in a complete temperature compensation of this enzyme. This compensation is interpreted as an adaptative response. 3. 3. Acclimation to cold as compared to heat resulted in absence of variations in Q 10 for V̇O 2 (oxygen consumption) and total V̇O 2 values. 4. 4. Tissue peroxidation products (TBA-RS) were significantly higher in cold than in heat acclimated tadpoles.
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