Paper published in Journal of Comparative Physiology B

image001In this study we found that cold tolerance in Enchytraeus albidus was varied in a reliable manner with location from where the populations originated such that cold adapted arctic populations were more cold resistant than populations from temperate environments. Glucose accumulation, glycogen reserves and metabolic rate also varied significantly between populations but this variation was not related directly to cold tolerance suggesting that the metrics important for cold tolerance are complicated. When measuring metabolic rate of frozen and unfrozen animals at the same temperature (-2°C) we found a metabolic depression of approximately 50%. Interestingly this depression was larger in the arctic than temperate population suggesting that frozen artic animals may have lower energetic turnover than temperate conspecifics.