Abstract
Marbled salamanders (Ambystoma opacum) in different reproductive and hydration states were tested in a round soil moisture gradient to determine the role of soil moisture in habitat selection. Breeding animals in the gradient chose soil moisture randomly suggesting that substrate moisture is not a significant cue for the placement of the terrestrial nests. Non-breeding animals displayed a mean preference of 74% available moisture. Dehydrated salamanders chose significantly higher moistures (mean of 89%). Rate of water loss, rate of rehydration and tolerance to dehydration were estimated. The marbled salamander shows no special physiological adaptations to dehydration.
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