Abstract

Net water gain and loss by partially dehydrated female house dust mites, Dermatophagoides farinae, were measured in several combinations of water vapor activity ($a_{v}$) and temperature. At some specific $a_{v}'s$ and temperatures experimental mites continued to dehydrate while at others mites rehydrated by extracting water from ambient water vapor. The lowest $a_{v}$ at which a net gain of water occurred (critical equilibrium activity, CEA) was directly proportional to temperature; CEA's were 0.69 at 35 C, 0.63 at 30 C, 0.58 at 25 C, and 0.52 at 15 C.

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