Abstract
Abstract: Two populations of the psocid, Liposcelis bostrychophila Badonnel, were exposed to two CO2‐enriched atmospheres (35% CO2 + 21% O2, and 55% CO2 + 21% O2, balance N2) for 30 generations. Controls were reared in normal atmospheres. The reserves of triacylglycerol and polysaccharides were evaluated in adults of the two experimental and the control populations in generations F15 and F30. The utilization rate of triacylglycerol and polysaccharides in the CO2‐enriched atmospheres were also determined in generation F30. The results indicated that the reserves of triacylglycerol and polysaccharides increased significantly during selection for CO2 resistance; the higher the resistance level, the greater the reserves. Exposure of these populations to controlled atmosphere was associated with a steady utilization of the reserves. By contrast, the unselected population responded to controlled atmospheres by accelerated utilization of triacylglycerol and polysaccharides. Comparison of the utilization rates during CO2 exposure showed that triacylglycerol is the main energy source, and polysaccharides contribute to metabolic energy supply only to a small extent.
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