DISPERSAL OF ADULT FEMALE FIG WASPS .1. ARRIVALS AND DEPARTURES

Ficus burtt-davyi, like most other fig species (Ficus, Moraceae), is e xclusively pollinated by its own unique species of fig wasp, in this c ase Elisabethiella baijnathi (Chalcidoidea, Agaonidae). Because fig cr op development on any one tree is usually synchronised, the small and short-lived female wasps have to migrate and find other trees bearing figs which are at suitable stage of development for oviposition. Howev er, the likelihood of successful location and subsequent arrival at a new host tree is dependent on distance and the effect of environmental factors such as wind and temperature. This study examines the relatio nship between ambient temperatures and the timing of fig wasps emergen ce from their natal figs and the commencement of their dispersal fligh t. The behaviour of the wasps arriving at figs which were ready to be pollinated was also examined. The female wasps did not appear to disti nguish between the figs and other parts of the tree when in flight. Ho wever, after landing on the tree their search for figs was more direct ed as they visited more figs than leaves. Short-range recognition of f igs appears to be by contact chemo-reception, but the wasps showed a p reference for entering figs which did not already contain a female was p.