Judul: Estimation of Sunda Clouded Leopard Population and Its Habitat Suitability and Connectivity in Batutegi Protected Forest Lampung
Abstrak: Salah satu spesies karnivora yang paling langka dan paling sedikit dipahami, macan dahan sunda (Neofelis diardi) menghadapi ancaman besar akibat hilang dan terfragmentasinya habitat yang terus berlanjut. Hutan Lindung Batutegi yang diidentifikasi sebagai habitat macan dahan sunda, juga mengalami fragmentasi dan perambahan. Ancaman-ancaman tersebut telah menyebabkan berkurangnya ketersediaan habitat yang sesuai bagi populasi macan dahan sunda yang sudah terisolasi dan menciptakan hambatan yang membatasi pergerakannya. Pemahaman terhadap kondisi populasi macan dahan sunda, faktor-faktor yang mempengaruhi pemilihan habitatnya, dan pengembangan koridor ekologi untuk meningkatkan konektivitasnya sangat penting bagi konservasi macan dahan sunda di Hutan Lindung Batutegi. Penelitian ini mengkaji data camera trap yang dipasang pada periode Maret – Desember 2023 dan menggunakan spatially explicit capture-recapture (SECR) untuk menganalisis kepadatan populasi macan dahan Sunda. Pemodelan maximum entropy (Maxent) digunakan untuk membuat peta kesesuaian habitat, yang kemudian digunakan untuk membuat permukaan resistansi untuk melakukan analisis konektivitas habitat menggunakan pemodelan least-cost path (LCP). Macan dahan sunda yang teridentifikasi berjumlah lima individu dengan sex ratio satu jantan dan satu betina (1:1) serta dua kelompok umur yaitu muda dan dewasa. Perkiraan kepadatan macan tutul sunda adalah 2,23 individu/100 km2. Hasil penelitian menunjukkan bahwa area studi mampu mendukung keberadaan macan dahan sunda, dengan tingkat kesesuaian sedang dimana keberadaan macan dahan sunda didorong oleh keberadaan lanskap hutan dan area berelevasi tinggi. Prediksi jalur-jalur konektivitas menunjukkan bahwa koridor yang paling sesuai dapat memfasilitasi pergerakan macan dahan sunda dari satu kawasan hutan ke kawasan hutan lainnya dengan melintasi matriks petak hutan dan kebun campuran dan menghindari perkebunan monokultur. Implikasi pengelolaan yang dapat mendukung konservasi macan dahan sunda adalah dengan memastikan kawasan budidaya menjadi semakin heterogen sehingga menyediakan koridor yang lebih permeabel., One of the rarest and least understood species of carnivore, the Sunda clouded leopard (Neofelis diardi), is facing considerable threats from continued habitat loss and fragmentation. The Batutegi Protected Forest, which was recently identified as an existing, but isolated habitat of this vulnerable felid, is also experiencing fragmentation and encroachment. These combined threats have led to a reduction in the availability of suitable habitat for this isolated population and creates barriers restricting its movement between forested areas. Understanding the condition of the Sunda clouded leopard’s population, the influencing factors for its habitat selection, and ecological corridors development to improve its connectivity is critical to the conservation of the Sunda clouded leopard in Batutegi Protected Forest. This research examined camera trap data installed in March – December 2023 period and used spatially explicit capture-recapture (SECR) to analyze the population density of the Sunda clouded leopard. Maximum entropy (Maxent) modeling was used to construct a habitat suitability map, which was used to develop the resistance surface for performing habitat connectivity analysis using least-cost path (LCP) modeling. There were five individual Sunda clouded leopards identified with the sex ratio of one male to one female (1:1) and two age groups of juvenile and adult. The estimated density of the Sunda clouded leopard is 2,23 individual/100 km2. The results indicated that there was a moderate potential that some areas of the study region to support the occurrence of Sunda clouded leopard, whose presence appeared to
Keyword: habitat connectivity, habitat suitability, population density, sunda clouded leopard

Judul: Habitat Characteristics of Sunda Clouded Leopard (Neofelis dardi Cuvier, 1823) in the Area of Batutegi Protection Forest Lampung
Abstrak: Macan dahan sunda (Neofelis diardi Cuvier, 1823) adalah satwa pemangsa yang terancam oleh fragmentasi habitat karena alih fungsi hutan menjadi pemukiman dan lahan pertanian. Salah satu habitat macan dahan sunda di Sumatra adalah di Hutan Lindung Batutegi. Penelitian ini bertujuan mengidentifikasi fungsi-fungsi habitat macan dahan sunda dan karakteristiknya. Data dikumpulkan melalui pengamatan langsung menggunakan petak-petak vegetasi, transek garis, kamera jebak, dan pengamatan tidak langsung untuk menentukan jejak-jejak aktivitas satwa. Analisis vegetasi dan tajuk digunakan untuk menggambarkan karakteristik habitat, sedangkan data satwa mangsa potensial dianalisis menggunakan indeks keanekaragaman dan kelimpahan jenis. Hasil menunjukkan area berburu macan dahan sunda adalah area bertutupan tajuk rapat (64,67%) dan terdapat banyak mangsa potensial. Mangsa potensial dengan keanekaragaman dan kelimpahan yang lebih tinggi ditemukan di habitat hutan dataran rendah (H’=2,35), sedangkan keanekaragaman mangsa potensial yang lebih rendah ditemukan di habitat hutan pegunungan bawah (H’=1,81). Area istirahat, tidur, dan berlindung macan dahan sunda adalah area-area bertutupan tajuk sangat rapat (78,64% dan 73,43%)., Sunda clouded leopard (Neofelis diardi Cuvier, 1823) is a predator that threatened by habitat fragmentation due to the conversion of forest into residential and agricultural areas. One of the habitats of sunda clouded leopard in Sumatra is in the Batutegi Protection Forest. This research aimed to identify the habitat functions of sunda clouded leopard and its characteristic. Data were collected by direct observation using vegetation plots, line transect, camera trapping, and indirect observation to determine signs of animal activities. Vegetation and canopy openness analysis was used to describe the habitat characteristic, while data of potential prey were analyzed using species diversity and abundance indices. The results show that hunting area for sunda clouded leopard is an area with dense canopy cover (64,67%) and abundance potential prey. Potential prey diversity and abundance with higher rate found in lowland forest (H’=2,35), while the lower rate found in sub-montane forest (H’=1,81). Resting, sleeping, and hiding area for sunda clouded leopard are areas with very dense canopy cover (78,64% and 73,43%).
Keyword: macan dahan sunda, habitat, satwa mangsa, habitat, prey, sunda clouded leopard

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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