Upper lethal temperatures of the pelecypod Modiolus demissus in relation to declining environmental temperatures

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Abstract
Determinations of 24-h upper lethal temperatures of the ribbed mussel Modiolus demissus (Dillwyn) in relation to declining autumn and winter habitat temperatures show effective thermal acclimatization. Upper lethal temperatures ranged from 39.48 ± 0.33C to 37.67 ± 0.08C and the descending range of mean monthly environmental temperature was from 25C to −1.1C. Environmental and test salinity ranged from 28 to 30‰.The regression of lethal temperature on acclimatization temperature is significant when a direct correlation (concomitant) is made between ambient temperature and lethal temperature. Thus, current ambient temperature is an accurate reflection of acclimatization in this species.