Abstract
Concentrations of blood protein and urea were measured in captive Sterotherus carinatus, S. depressus, S. minor and S. odoratus. Different levels of plasma urea were observed comparing S. minor and S. depressus to S. odoratus. Interspecific variation in total plasma protein was not observed. Fasted S. odoratus showed decreased plasma urea and protein concentrations compared to all turtles which were fed. Only one Sternotherus individual had a higher concentration of urea in plasma compared to bladder urine.
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