Abstract
In third and fourth instar larvae of the midge Chaoborus crystallinus the concentrations of various metabolites were estimated during anoxia and in the course of recovery from anaerobiosis. The glycogen reserves were found to be unusually low, whereas malate is present in quantities exceeding those of total glucans. Under anoxic conditions the concentration of malate drops rapidly and, concomitantly, the level of succinate rises in a reciprocal manner. In addition, large quantities of alanine are accumulated, while lactate is produced as a minor end product. During recovery from anaerobiosis the concentrations of malate and succinate are restored to the values of normoxia within less than 3 hr. In contrast, alanine and lactate decrease rather slowly and are still substantially higher than normal after 12 hr. The possible significance of malate utilization by the larvae in relation to the demands of their normal conditions of life is discussed.
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