An increase in oil palm plantation area of ± 9.3 million hectares within 20 years (1997 – 2006) raises concerns of the international communities on the loss of diversity, including butterflies. Butterflies have multiple ecological functions, including as pollinator and ecosystem balancer, hence research about the impact of oil palm plantation development on the loss, gain, and diversity is important to conduct. The research was conducted in March 2018 in PKWE Plantation, West Kalimantan Province, by using Pollard transect method and trap in seven land covers. The land covers consist of two original land covers before made into oil palm plantation, in the form of shrubs and secondary forest, and five land covers after made into oil palm plantation, in the form of old, medium, young oil palm plantation, High Conservation Value (NKT) area, and yard. The total butterfly species found amounted to 49 species, 315 individuals, four families: Papilionidae (8 species), Pieridae (8 species), Nymphalidae (31 species), and Lycanidae (2 species). The highest number of species and diversity were discovered in the High Conservation Value (HCV) area (S=26; Dmg=6.24), while the lowest ones were located in a yard area (S=11; Dmg=2.09). Based on conservation status, there were a butterfly species which is protected namely Troides helena. Regarding the loss and gain of butterfly species, oil palm plantation development had caused a much lower loss than gain. With the loss of five species and gain of 27 species compared to the original land cover in the form of secondary forest, and the loss of three species and gain of 26 species compared to the original land cover in the form of shrubs.
Oil palm plantation in Indonesia is rapidly growing, encouraging the expansion of oil palm plantation area. The expansion estimated may decrease the biodiversity including the butterfly diversity. The research aimed to see the impact of oil palm plantation on the butterfly diversity that occurs in KGP and CNG oil palm plantation. The research was conducted in July 2018 by strip transect method. Impact of the establishment oil palm plantation on butterfly diversity was determined by comparing the current butterflies found on oil palm plantations area with the butterflies found on the baseline (shrub area). The result showed an increase in butterfly diversity and species richness index in KGP and CNG oil palm plantation. Total number of species and richness index in both oil palm plantations area were higher than the baseline area. The establishment of oil palm plantation in KGP oil palm plantation result gaining 22 species and losing 2 species, while in CNG oil palm plantation result is gaining 31 species and losing 5 species.
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