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High latitudes are considered particularly vulnerable to ocean acidification, since they are naturally low in carbonate ions. The edible mussel Mytilus chilensis is a common calcifier inhabiting marine ecosystems of the southern Chile, where culturing of this species is concentrated and where algal blooms produced by the toxic dinoflagellate A. catenella are becoming more frequent. Juvenile Mytilus chilensis were exposed to experimental conditions simulating two environmental phenomena: pCO(2) increase and the presence of paralytic shellfish toxins (PST) produced by the dinoflagellate Alexandrium catenella. Individuals were exposed to two levels of pCO(2): 380 mu atm (control condition) and 1000 mu atm (future conditions) over a period of 39 days (acclimation), followed by another period of 40 days exposure to a combination of pCO(2) and PST. Both factors significantly affected most of the physiological variables measured (feeding, metabolismand scope for growth). However, these effects greatly varied over time, which can be explained by the high individual variability described formussels exposed to different environmental conditions. Absorption efficiency was not affected by the independent effect of the toxic diet; however, the diet and pCO(2) interaction affected it significantly. The inhibition of the physiological processes related with energy acquisition by diets containing PST, may negatively impact mussel fitness, which could have important consequences for both wild and cultured mussel populations, and thus, for socioeconomic development in southern Chile. (c) 2018 Elsevier B.V. All rights reserved.