Abstract:
Gunawan, Sulistijorini, Chikmawati T, Sobir. 2021. Predicting suitable areas for Baccaurea
angulata in Kalimantan, Indonesia Using MaxEnt Modelling. Biodiversitas 22: 2646-2653. Baccaurea
angulata Merr. or ‘Belimbing Dayak’ is an underutilized fruit indigenous in Kalimantan. This species
potentially used as edible fruit and medicinal plant. Unfortunately, the forest conversion to oil palm and
rubber plantations causes decreasing the habitat of B. angulata. However, little is known about the
occurrences and suitable habitat of B. angulata in Kalimantan. This investigation is might be the first
study report on predicting the distribution of B. angulata in Kalimantan using MaxEnt (Maximum
Entropy). The results show that four variables namely solar radiation in October, altitude, precipitation
of warmest quarter, and gloslope are significant factors determining B.angulata’s suitable habitat. The
location of suitable habitat for B. angulata is accordant with the real present distribution. The extent of
potentially suitable area was significantly larger than the present occurrence of B. angulata in
Kalimantan. The highest suitable areas identified in this study covered West Kalimantan and South
Kalimantan. They included parts of SB (Sambas), LD (Landak), SG (Sanggau), SK (Sekadau) and BK
(Bengkayang) of West Kalimantan Provinces, and TL (Tanah Laut), BN (Banjar) of South Kalimantan
Provinces. The MaxEnt model performed better than random method with an Area Under Curve (AUC)
value of 0.937 and it was statistically significant. It indicated that MaxEnt model was highly accurate
and informative for habitat suitability of B. angulata. The predicted model of suitable areas can be used
for management, monitoring, cultivation and future conservation of B. angulata.
Keywords: Phyllanthaceae, Kalimantan, habitat suitability, conservation, modeling
