Abstract
The wing-morph composition of populations of planthoppers exploiting stable and temporally uncertain resources was determined. In stable habitats like salt and fresh water marshes, the optimum population strategy of most planthoppers is to produce flightless brachypters which can efficiently use and remain on the immediate resource. Macropters, which can fly, are more adaptive and predominate in temporary habitats because they can emigrate and colonize new resources when conditions are no longer suitable.