Abstract
Some aspects of the relationship between water balance characteristics and biological fitness have been explored both for a laboratory-reared stock (K85P1) of Drosophila mimica and for each of four field-caught populations of D. mimica. At low a v 's, there is a clear correlation between water loss rates and survival time, but at saturation, the relationship is less striking. Neither body weight nor sex correlate strongly with water loss rate at 0.70 a v , but females survive longer than males. Some differences in the response to desiccation between populations from different collection sites are also suggested.
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