Judul: Karakteristik Habitat dan Wilayah Jelajah Bekantan (Nasalis Larvatus, Wurmb) di Hutan Mangrove Desa Nipah Panjang Kabupaten Kubu Raya Provinsi Kalimantan Barat
Abstrak: Bekantan is a spesies of the primates who lived at rivarian forest and mangrove forest in Kalimantan island. Bekantan was protected by law and regulation No.5 of 1990 about nature resources conservation and the ecosystem which is showed the status of bekantan. This species also included in Appendix I of CITES and was categorized as susceptible species on IUCN Red Data Book 1978. The population of bekantan has decrease drastically through habitat destruction because of that it has to do a research about habitat characteristic and homerange of bekantan at Nipah Panjang Village, Batu ampar. The information will be one of the variable to get sustainable populatin management of bekantan. The species of vegetation and ground vegetation that using as habitat and food resources for bekantan was already calculated using plot line method with the length of the line is 100 m and width of the line is 50 m. To ,measuring the dayrange of bekantan that based on DR, RM, and NPS in radio tracking that base on GPS. It was started when the bekantan leave sleeping tree on 05.30 AM until the bekantan get into the next sleeping tree on 06.30 PM. Scope of the homerange was determined using Minimum Convex Polygon method in software Arc view. This method can connected outside coordinate points on the activities place of bekantan. On the research site at Lalau river and Sukamaju River was identified is spesies of vegetations that used at food resources by bekantan. The species of vegetation that often consumed by bekantan are R. apiculata, R mucronata, B. gymnorrhiza, B. parviflora and Acrostchum speciosum. Estimation homeranges scope of group I is 13.4 ha in Lalau riverine and group II in Suka Maju riverine is 38 ha. Daily range group of bekantan in Suka Maju river is 984.9 m on the average. It is different with DR from group of bekantan at Lalau river is 756.7 m on the average. The differences of DR caused by some factors like foods abudances, human disturbing, and the rise and fall of the tides and water salinity. Bekantan using strata B on the high at 20 - 30 m for their vertical movement to activities like eating, resting, calling, moving, and also to chose the sleeping tree has influenced by the food avaibility like shoot of youg leaves and young leaves and security factor from predators attacks like monitor lizards crocodiles and mangrove snakes. The habitat of bekantan at Nipah Panjang is Mangrove rivarian forest with estimation homerange scope group of bekantan in Lalau river is 13.4 ha, value of DR is 756.7 m and RM 367.5 m on the average. The home range scope group of bekantan in Suka Maju river is 38 ha, value of DR is 984.9 m on the average and RM is 367.82 m on the average.
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Judul: Habitat and Population Viability of Proboscis Monkey (Nasalis larvatus Wurmb.) in Berau Delta, East Kalimantan
Abstrak: Bekantan (Nasalis larvatus) adalah spesies endemik di Pulau Kalimantan yang habitatnya terbatas di hutan bakau, sungai, dan rawa. Sebagian besar habitatnya berada di luar kawasan konservasi sehingga sangat rentan mengalami kerusakan dan konversi habitat. Hilangnya habitat merupakan ancaman signifikan terhadap penurunan populasi bekantan. Delta Berau adalah salah satu habitat bekantan yang tidak dilindungi, mengalami banyak gangguan, dan kurang mendapat perhatian. Tujuan penelitian ini adalah: 1) untuk mengidentifikasi karakteristik dan tipe habitat bekantan, 2) mengetahui populasi, penyebaran, dan tipe metapopulasi bekantan, 3) menyusun model spasial kesesuaian habitat bekantan dan faktor lingkungan yang berpengaruh, 4) menganalisis tingkat konektivitas habitat dan prioritas lokasi restorasi, dan 5) memprediksi laju kepunahan lokal bekantan di Delta Berau. Hasil penelitian menunjukkan kondisi tutupan lahan di Delta Berau didominasi oleh hutan mangrove-rawa (35,92%) diikuti oleh hutan sekunder (17,10%) dan hutan riparian (12,96%). Berdasarkan indeks kesamaan komunitas Jaccard, habitat bekantan terdiri dari dua tipe, yaitu: tipe habitat bakau (Tanjung Buasin dan Muara Guntung) dan tipe hutan riparian (Sungai Lati, Pulau Saodang Kecil, Batu-Batu dan Bebanir Lama). Setidaknya ada 74 jenis tumbuhan berhabitus pohon yang termasuk dalam 61 marga dan 37 suku. Habitat mangrove didominasi oleh Rhizophora mucronata, R. apiculata, Sonneratia alba, dan Avicennia alba, sedangkan habitat riparian didominasi oleh S. caseolaris, Vitex pinnata, Brownlowia argentata, Heritiera littoralis, Syzygium lineatum, dan Xylocarpus granatum. Sebanyak 22 jenis di antaranya adalah sumber pakan bekantan. Pakan utama bekantan adalah Sonneratia caseolaris, S. alba, A. alba, R. mucronata, R. apiculata, V. pinnata, dan Elaeocarpus stipularis. Populasi bekantan di Delta Berau adalah 1350-1774 ekor terbagi menjadi 115 kelompok satu jantan (one-male group/OMG), lima kelompok semua jantan (all-male group/AMG), lima kelompok tidak teridentifikasi, dan satu ekor jantan dewasa soliter. Kepadatan populasi 6,56 ekor/km2 (kisaran: 0,91-93,33) atau 0,59 kelompok/km2 (kisaran: 0,13-9,17). Rasio jenis kelamin berdasarkan kelompok OMG di habitat riparian adalah 1:5,6 dan di habitat mangrove 1:6,1. Terdapat 15 metapopulasi bekantan di Delta Berau, lima diantaranya metapopulasi classic (57,10%), empat metapopulasi patchy (28,20%), dan enam metapopulasi non-equilibrium (4,80%). Habitat bekantan yang memiliki kesesuaian tinggi seluas 2751 ha (2,94%), kesesuaian menengah 1595 ha (1,70%) dan kesesuaian rendah adalah 4381 ha (4,68%). Variabel yang berkontribusi besar dalam membangun model adalah tipe habitat riparian (60,90%), jarak dari tambak (16,00%), dan jarak dari pantai (5,20%). Analisis konektivitas habitat menggunakan Condatis metode dropping menghasilkan nilai aliran 10,0281. Simulasi yang dilakukan dengan penambahan habitat melalui restorasi dapat meningkatkan nilai aliran menjadi 11,4281. Layer prioritasisasi untuk restorasi menunjukkan area dengan prioritas tinggi seluas 12.967 ha (32,95%), prioritas menengah 12.994 ha (33,02%), dan prioritas rendah 13.388 ha (34,02%). Metapopulasi Pulau Besing, Tanjung Perangat, dan Teluk Semanting populasinya menurun dan akhirnya mengalami kepunahan dalam kurun waktu sepuluh generasi (80 tahun) ke depan dengan tingkat penurunan 72,00-98,20%, sedangkan metapopulasi Bebanir Lama dan Pulau Saodang Kecil akan bertahan. Tiga skenario pemodelan melalui restorasi habitat mampu menahan penurunan populasi bekantan berkisar antara 2,50-22,84%, bahkan skenario restorasi habitat sekaligus pencegahan kebakaran hutan mampu meningkatkan populasi sebesar 5,71%., Proboscis monkey (Nasalis larvatus) is an endemic species of Borneo island, which habitat is mostly limited to mangrove, rivers, and swamps forests. Most of their habitats are outside the conservation areas, so it is vulnerable
Keyword: condatis, MaxEnt, metapopulasi, suitabilitas habitat, vortex

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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