Abstract
Measurements of food consumption in Tribolium confusum through 22Na accumulation or 22Na clearance were compared. The two methods had specific characteristics with regard to usefulness, accuracy and the need for calibration. Food consumption, measured by 22Na accumulation, and respiration were compared in adult males and females submitted to various doses of irradiation (10–200 Gy). It was observed that irradiation decreased both food consumption and respiration, its effects being stronger on the former than on the latter. It was also shown that irradiation had no damaging effects on sodium regulation or on carbon utilization. From a more practical point of view it was concluded that 22Na could occasionally be a useful tool for testing insect infestation in foodstuffs.
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