Abstract
1. 1. The plasma osmotic pressure (OP), Na +, K + and Cl − concentrations of larval Aeshna cyanea were investigated at different nutritional states. 2. 2. A single ad lib feed of larvae, starved for 10 days, causes a sharp rise in OP after 1 day due to an accumulation of food material in the plasma followed by a slow decline until a steady state is reached after 30 days. 3. 3. The change in OP is assumed to control the percutaneous water entry. 4. 4. A similar change occurs in the Na + and Cl − concentrations. These ions account for 35% of the OP rise and decline until 10 days but for 90% between 10 and 30 days of starvation. 5. 5. The reduction in Na + and Cl − concentrations and possibly in hemolymph volume is interpreted as a means of osmoregulatory adaptation to the demand of energy saving during long-term starvation. 6. 6. The Cl − concentration changes by 64% per 100% change in Na + concentration. 7. 7. The nutritional states investigated have no effect on the K + concentration.
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