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Adaptive responses to feeding in Burmese pythons: pay before pumping
1Department of Physiology, University of California at Los Angeles School of Medicine 90095-1751, USA.
The Journal of Experimental Biology
|June 1, 1995
Summary
Burmese pythons exhibit an extreme physiological response to large meals, significantly increasing oxygen consumption and nutrient absorption. This digestive adaptation, known as specific dynamic action (SDA), is the most pronounced ever recorded in vertebrates.
Area of Science:
- Physiology
- Animal Biology
- Comparative Physiology
Background:
- Burmese pythons are known for consuming large meals infrequently.
- Understanding their post-feeding physiological adaptations is crucial for reptile biology.
Purpose of the Study:
- To quantify the physiological changes in Burmese pythons after consuming a large meal.
- To investigate the metabolic and intestinal responses to digestion in these snakes.
Main Methods:
- Measurement of oxygen consumption rates and blood chemistry.
- Analysis of small intestinal brush-border uptake of amino acids and glucose.
- Assessment of organ mass changes over 30 days post-feeding.
Main Results:
- Oxygen consumption (specific dynamic action) peaked at 17 times fasting levels.
- Intestinal nutrient uptake rates and capacities increased significantly (6-26x and 11-24x, respectively).
- Small intestinal mass doubled, accompanied by significant blood chemistry changes, including an 'alkaline tide'.
Conclusions:
- The post-feeding response in pythons represents the most extreme specific dynamic action and nutrient transporter upregulation reported in vertebrates.
- These adaptations support the high metabolic demands of digesting massive meals in Burmese pythons.
- The energy expenditure for digestion is substantial, highlighting the physiological cost of infrequent, large feeding events.