Coexistence of three differentDrosophila species by rescheduling their life history traits in a natural population

We present evidence for coexistence of three differentDrosophila species by rescheduling their life history traits in a natural population using the same resource, at the same time and same place.D. ananassae has faster larval development time (DT) and faster DT(egg-fly) than other two species thus utilizing the resources at maximum at both larval and adult stages respectively. Therefore,D. ananassae skips the interspecific competition at preadult stage but suffers more from intraspecific competition. However,D. melanogaster andD. biarmipes have rescheduled their various life history traits to avoid interspecific competition. Differences of ranks tests for various life history traits suggest that except for DT(egg-pupa), the difference of ranks is highest for the combination ofD. melanogaster andD. ananassae for all other life history traits. This difference is maintained by tradeoffs between larval development time and pupal period and between pupal period and DT(egg-pupa) inD. ananassae.