Abstract
Although several rodent species conserve water to the extent that drinking is not required (Schmidt-Nielsen 1964), numerous other species become conditioned or acclimated to water deprivation when water supply is gradually reduced during a comparatively long interval. Chew (1965) cites studies in which nine rodent species adjusted to greatly reduced rations of water. Invariably this adjustment requires appreciable time, in the order of weeks, as illustrated by the performance of wild house mice (Mus musculus); approximately 50% of an experimental sample survived total water deprivation at 30 C and 40% relative humidity after initial exposure of 30 days to 80% followed by 49 days of 60% relative humidity. All mice died when suddenly exposed to 40% relative humidity (Haines and Schmidt-Nielsen 1967). A period of transition from one level of water intake to another is recognized by many authors as necessary for establishment of maximum performance of a species (e.g., Hudson 1962; MacMillen and Lee 1969). Since days to weeks are required for weight equilibration, there is reason to inquire into the nature of the transitory process.
Published Version
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