Genetic variability and ecological adaptability of hypopus formation in a stored product mite.

Occurrence in Lepidoglyphus destructor of a facultative developmental stage (hypopus) adapted for dispersal and dormancy depends on genotype X environment interaction. Dietary factors affect hypopus formation, but the response of individuals to food quality greatly differs according to genotype. Large genetic variation in the control of hypopus formation exists within as well as between populations. Response to selection is rapid and reversible. The trait has substantial potential for selective adaptation to unpredictably varying environments and for evolutionary change.