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Journal of Experimental Biology 40,701-711 (1963)
Published by Company of Biologists 1963

A Site of Water and Ionic Exchange with the Medium in Podura Aquatica L. (Collembola, Isotomidae)

J. NOBLE-NESBITT ¹

¹ Department of Zoology, University of Cambridge; School of Biological Sciences, University of East Anglia

1. In the collembolan Podura aquatica L., uptake of water occurs both via the mouth and across the ventral tube vesicles.

2. Drinking is important in water-stress situations and when the haemolymph pressure is too low for eversion of the vesicles. Everted vesicles alone are sufficient for recovery from partial desiccation.

3. Experiments in which insects with their mouths or ventral tubes blocked were exposed to a medium containing ²⁴Na indicated that most of the exchange of sodium between insect and medium occurred over the ventral tube vesicles, and that this exchange was rapid.

4. In experiments using ⁴²K, no measurable exchange occurred between the insect and the medium.