Abstract
1. 1. Measurements of water flux in certain terrestrial isopods, especially Oniscus asellus, using tritiated water and weighing techniques, indicates that water exchange occurs between the animals and a variety of moist environments. The flux rate is different species, and varies, in O. asellus, with actual moisture condition. 2. 2. The order, in terms of decreasing magnitude of the influx of tritiated water, is: Ligia oceanica > O. asellus > Porcellio scaber> Armadillidium vulgare. 3. 3. O. asellus appears to be in equilibrium with moist conditions providing it is not immersed. 4. 4. The relevance of these results to the behaviour and physiology of woodlice is discussed.
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