The impact of oil palm plantation on ecology of rambutan (Nephelium lappaceum) insect pollinators
Syarifuddin, Hafnisiregar E, Jambak J, Suryani C. 2018. The impact of oil palm plantation on ecology of rambutan(Nephelium lappaceum) insect pollinators. Biodiversitas 19: 1347-1351. The establishment of oil palm plantation in Sumatra was theresult of massive conversion of its rainforest. Many studies have shown that oil palm plantation is a main threat to biodiversity includinginsect pollinators. However, its effect on the ecology of insect pollinators is still poorly studied. In this study,
... d. In this study, we investigated the impactof oil palm plantation on the species richness and composition, abundance as well as pattern of time period and duration of insect visiton rambutan, Nephelium lappaceum, flowers. Insect visitors of flowers were compared between rambutan grown in the Oil PalmPlantation (OPP) ecotone and the one in the mixed Oil Palm Garden Forest (OPGF) ecotone. Number of visiting insects on eachpannicle in ten minutes period and number of flowers and pannicles visited within 2 minutes were enumerated. The length of time of arandomly selected individual of the most abundant insects visited a flower and a pannicle was also recorded. The results showed thatspecies composition of insect visitors was different between the two ecotones and total insect abundance was significantly higher onrambutan flowers located in the OPGF ecotone compared to rambutan trees grown close to oil palm plantation. The insect visitors onrambutan flowers in the OPGF ecotone were dominated by bees while in the OPP was dominated by Calliphorid fly. Among the mainpollinators, the bee Apis cerana visited far more flowers and pannicles compared to Trigona sp and Chrysomya sp. Thus, more evidenceshowing that oil palm plantation probably has caused the disappearance of main species of bee pollinators, reduced abundance of flowervisitinginsects, change of pollinator species composition, change of the pattern of time and change the duration of insect visit oframbutan flowers.