Abstract
The experiment was made to find out the relation between temperature and dispersive behavior with laboratory and newly collected wild strains of Drosophila melanogaster. There were three patterns of dispersive response to temperature: linear response, threshold response and optimum temperature response. The different strams had different dispersive responses both in laboratory and wild strains suggesting that the response to temperature would be a genetic character. There were also different sensitivity between the newly collected strains from northern region and these from southern region. The northern strains had higher dispersive activity than the southern strains. Two possible reasons were considered for the results. The first was some selection for dispersive activity due to the climatic condition, and the second was island effect.
