Physiology of Acclimation to Low Temperature in Poikilotherms

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Abstract
Potassium, sodium, and calcium increase and chloride, magnesium, and free amino acids decrease in cold acclimated fresh-water mussels and earthworms. Increased protein synthesis occurs.Neurosecretory cells of cold earthworms exhibit increased activity. Addition of cold worm body fluid stimulates increased O2 consumption by normal tissues, indicating that a hormonal agent triggers the sequence of changes.