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The comparison of temperature responses of two mytilids from the high (Brachidontes purpuratus) and low (Semimytilus algosus) intertidal zone of the Peruvian coast was carried out focusing on the production of micronucleus and nuclear abnormalities in gill tissue. Two temperatures (23 and 11°C) were evaluated, in presence of three mitomycin C concentrations as a stressor (0.02, 0.04 and 0.06 × 10−6...