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How a Turtle's Shell Helps It Survive Prolonged Anoxic Acidosis
1Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, Rhode Island, 02912.
Summary
Turtles survive anoxia for months using their shell as a unique buffer against lactic acid buildup. This mineralized shell releases carbonates and stores acid, preventing fatal acidosis during oxygen deprivation.
Area of Science:
- Comparative physiology
- Biochemistry
- Environmental adaptation
Background:
- Anoxic conditions lead to lactate accumulation in turtle blood.
- Acidosis is a life-threatening consequence of severe lactate buildup.
Purpose of the Study:
- To investigate the role of the turtle shell in buffering lactic acid during anoxia.
- To understand the mechanisms enabling long-term survival without oxygen.
Main Methods:
- Analysis of blood lactate levels in anoxic turtles.
- Examination of shell composition and buffering capacity.
- Assessment of metabolic depression during anoxic exposure.
Main Results:
- Turtles accumulate high blood lactate levels under anoxic conditions.
- The mineralized shell releases calcium and magnesium carbonates, buffering lactic acid.
- Shell buffering, combined with metabolic depression, allows survival for months at 3°C.
Conclusions:
- The turtle shell serves as a critical buffer system against acidosis.
- This adaptation is key to turtles' remarkable anoxic survival capabilities.
- Shell buffering is a vital component of physiological resilience in anoxic environments.