Abstract
An experiment was conducted to find the relation between dispersive behavior and fitness using six strains of D. melanogaster. The dispersive behavior of a strain is quite different in the pure and the mixed condition. Both accelerations and diminutions of dispersive activity were detected. The activity of se strain was stimulated by other strains used, while cn bw strain reduced its activity except in the case of mixture with wa.
The dispersive activity is negatively correlated with fitness so that the usual conjecture that less fit flies may be those “forced” to migrate seems to hold.
