Abstract
In the order Collembola a clear relationship was found between overall cuticular water loss and water conditions of the habitat. The different transpiration rates were negatively correlated with the haemolymph osmotic pressure, but there was no clear causal relationship. In two species, Orchesella cincta and Tomocerus minor, which live sympatric but have a different micro-distribution (partly due to small scale heterogeneity in water conditions), important differences exist both in rate of water loss and in speed of water uptake: Orchesella cincta had a significantly lower transpiration and a higher speed of water uptake than Tomocerus minor. The transpiration rates of both species were linearly related to the vapour pressure deficit of the ambient air. Contrary to Orchesella cincta, Tomocerus minor lost water in saturated conditions. Freshly-killed Orchesella cincta had a higher transpiration rate than living individuals, but in Tomocerus minor there was no such difference. It is suggested that the main integumentary resistance against water loss in Orchesella cincta is the epidermal cell and in Tomocerus minor the epicuticle. The important rôle of the ventral vesicles in the water relations of Collembola was confirmed.
Published Version
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