A study on the female fig wasps(Wiebesia pumilae, Agaonidae) dispersal (flyingout) from the syconia (Ficus pumila, Moraceae) and on the ecological effects of light was conducted. The experiment shows that light was the determining factor for female of fig wasps toestablish their circadian rhythm of flying out. The time of first bundle of diffused light passingthrough the ostiole into syconia was the starting point of the rhythm. The reversal circadianrhythm experiments show that the fig wasps were able to e...