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Journal of Experimental Biology 58,385-400 (1973)
Published by Company of Biologists 1973

Water Relations in an Insect, Thermobia Domestica : III. Effects of Desiccation and Rehydration on the Haemolymph

A. Y. K. OKASHA ¹

¹ School of Biological Sciences, University of East Anglia, Norwich, NOR 88C; Department of Zoology, University of Assiut, Assiut, Egypt

1. The concentrations of Na⁺ and K⁺ in the haemolymph remain relatively constant during the moulting cycle.

2. Desiccation, desiccation followed by rehydration and starvation exert little or no effect on the concentrations of Na⁺ and K⁺ in the haemolymph.

3. The volume of haemolymph decreases during desiccation and increases after rehydration.

4. More Na⁺ is voided in the excreta during desiccation.

5. Repeated desiccation and rehydration causes the loss of both Na⁺ and K⁺ from the body.

6. The effects of desiccation and rehydration on the concentrations of chlorides and free amino acids in the haemolymph are described.