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The endangered tree Dracaena ombet Kotschy and Peyr. (Asparagaceae) is a native of Djibouti, Egypt, Eritrea, Ethiopia, Saudi Arabia, Somalia and Sudan. The tree has been experiencing population decline throughout its native ranges due to overgrazing, attack by pathogens, human overexploitation, and climate change. The conservation actions for this tree are hindered due to poor information on its geographical distribution. Using published occurrence data, current and future distribution of D. ombet under climate change was predicted in the present study using MaxEnt. The model performed better than random with area under the curve and true skill statistical values were 0.979 ± 0.034 and 0.724 ± 0.419, respectively. The tree was predicted to be found on mountain chain around the Red Sea with slope and precipitation being the most influential factors. Future prediction of D. ombet showed major loss of habitat in Djibouti, Egypt, Eritrea, Ethiopia, Somalia and Sudan. In Saudi Arabia, however, most of the population could deal with future climate and some population even could expand their ranges to higher latitude. The results from the present study can be used as a basis for further detailed survey of D. ombet and for planning the conservation actions needed to conserve the species, especially in dealing with future climate change.

Robiansyah I. 2018. Diversity and biomass of tree species in Tambrauw, West Papua, Indonesia. Biodiversitas 19: 377-386. In spite of its high diversity and endemism, New Guinea is still one of the least explored regions on the globe. Flora information for the island as a whole is low compared to other areas in Malesia, and for Indonesian Province of Papua and West Papua it is much lower than for Papua New Guinea. To add more information and data on the flora of the West Papua Province, a vegetation analysis was conducted in Fef (442-509 m) and Bamusbama (757-914 m) Subdistricts, Tambrauw District, West Papua, Indonesia. Six and four plots of 30x30 m were placed in Fef and Bamusbama, respectively, to assess and compare the diversity and biomass of trees with diameter at breast height ? 10 cm. A total of 457 stems and ca. 86 tree species were identified. Fef accommodated higher species number (70) than Bamusbama (42). Meliaceae and Myrtaceae were the most important families in Fef and Bamusbama, respectively, while Castanopsis acuminatissima was the most important species in both subdistricts.The species diversity, richness, and evenness in Fef was higher than in Bamusbama. For tree biomass, the estimated value in Bamusbama (383.8 ton/ha) was much higher than in Fef (224.7 ton/ha). The results of the present study may serve as a baseline information for sustainable forest management and conservation of the region.