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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Konservasi Hayati Jurnal Abdimas Serawai
Jarulis
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The Habitat Suitability Modelling of Rhinoceros Hornbills (Buceros rhinoceros) in Java Island, Indonesia Setiawan, Taufik; Prasetyo, Lilik Budi; Mulyani, Yeni A.; Jarulis
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol 14 No 2 (2024): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Pusat Penelitian Lingkungan Hidup, IPB (PPLH-IPB) dan Program Studi Pengelolaan Sumberdaya Alam dan Lingkungan, IPB (PS. PSL, SPs. IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.14.2.253

Abstract

Rhinoceros hornbills (Buceros rhinoceros) are a bird species belonging to the Bucerotidae family, which is vulnerable based on the IUCN red list of species. This is due to habitat fragmentation, which reduced the Rhinoceros hornbill habitat on Java. Efforts and strategies are needed to maintain Rhinoceros hornbill habitats. Information on the suitability of the Rhinoceros hornbill habitat on Java Island is required to develop a Rhinoceros hornbill conservation strategy. This study aimed to determine a habitat suitability model that produces the highest accuracy, analyze hornbill habitat suitability, and identify environmental variables that affect the existence of rhinoceros hornbills. Habitat suitability models were processed using three algorithms: random forest, support vector regression, and MaxEnt. The data used to model habitat suitability were presence and environmental variables. The model was evaluated using various accuracy measures, namely overall accuracy, sensitivity (sn), specificity (sp), Area Under Curve (AUC), and kappa coefficient. The resultsof model processing showed that the random forest algorithm produced the highest average accuracy of 0.74. The most important environmental variables for the habitat suitability model were the distance from the road (16.62%), distance from the forest (12.73%), and land cover (12.47%). The habitat suitability model was divided into three classes: low suitability, covering 75,048 km2 (55.94%); medium suitability, covering 52,911 km2 (39.44%); and high suitability, covering 6,213 km2 (4.63%). The results of the habitat suitability model showed that the habitat suitability class was the smallest in the area.
Analisis Filogenetik Ayam-Hutan Merah (Gallus gallus) Asal Sumatra Menggunakan Fragmen D-loop Mitokondria Jarulis; Haryanto, Hery; Karisma, Muhammad Aldiansyah; Kamilah, Santi Nurul
Konservasi Hayati Vol 21 No 2 (2025): OKTOBER
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/hayati.v21i2.42783

Abstract

Populasi ayam hutan merah (Gallus gallus) di habitat alaminya mengalami penurunan yang cukup tajam. Fakta ini disebabkan oleh hilangnya hutan sebagai habitat spesies tersebut. Penelitian ini dilakukan untuk menjelaskan komposisi nukleotida, situs nukleotida spesifik, jarak genetik, dan status filogenetik ayam hutan merah berdasarkan Fragmen D-loop DNA Mitokondria. Sampel darah diambil dari 20 individu ayam hutan merah dari Provinsi Bengkulu dan Sumatera Selatan pada periode Mei hingga November 2022. Isolasi DNA total dilakukan menggunakan Kit Protokol Spin-Column dari Qiagen. Replikasi DNA menggunakan teknik Polymerase Chain Reaction (PCR) dengan primer spesifik. Hasil penelitian kami menunjukkan adanya pasangan basa nukleotida AT (65,76%) yang lebih tinggi dibandingkan GC (34,24%), dan hanya ditemukan satu situs nukleotida spesifik dari panjang sekuen nukleotida 478 bp yang dianalisis. Komposisi nukleotida relatif homogen antar individu, menandakan rendahnya divergensi mitokondria. Rata-rata jarak genetik intraspesies sangat rendah yaitu 0,1%, yang mengindikasikan homogenitas genetik populasi. Pohon filogenetik memperlihatkan satu clade monofiletik yang kuat untuk seluruh sampel G. gallus Sumatra, dengan nilai bootstrap 63 - 87%, serta pemisahan yang jelas dari outgroup. Rendahnya variasi genetik ini diduga terkait dengan isolasi populasi, ukuran populasi efektif kecil, serta tekanan ekologis akibat fragmentasi habitat. Temuan ini menegaskan bahwa populasi ayam hutan merah liar di Bengkulu dan Sumatra Selatan merupakan unit genetik penting yang perlu diprioritaskan dalam upaya konservasi dan pengelolaan plasma nutfah unggas lokal.
GENETIC CHARACTERISTICS OF LONG-TAILED PARAKEETS (Psittacula longicauda modesta Fraser, 1845) FROM ENGGANO ISLAND Adipraja Mahmuda; Jarulis; Astuti, Dwi
BIOTROPIA Vol. 33 No. 1 (2026): BIOTROPIA Vol. 33 No. 1 January 2026
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2026.33.1.2721

Abstract

ARTICLE HIGLIGHTS- Genetic variation found in long-tailed parakeets native to Enggano Island- Genetic information shows population differences among island parakeets- Enggano Island population displays unique genetic characteristics- Results support conservation efforts for long-tailed parakeets on Enggano IslandABSTRACTThe Enggano Long-tailed Parakeet is considered as an agricultural pest by farmers on Enggano Island, leading to a continuing decline in its wild population. This study investigated the genetic characteristics, nucleotide composition, single-nucleotide polymorphisms (SNPs), species-specific barcodes, genetic distances, and phylogenetic relationships of this subspecies using the mitochondrial cytochrome oxidase subunit I (COI) gene. Fourteen blood samples were collected from community-owned captive birds. Total genomic DNA was extracted using the DNeasy® Blood and Tissue Kit following the Qiagen Spin-Column Protocol. DNA amplification was performed by Polymerase Chain Reaction (PCR) using specific primers at the Zoology Laboratory, Department of Biology, Faculty of Mathematics and Natural Sciences, University of Bengkulu. The amplified DNA was separated on a 2.4% agarose gel and visualized under ultraviolet light. Samples displaying clear DNA bands were subsequently sequenced by Apical Scientific. Sequence data were processed and aligned using MEGA version 11.0, resulting in a 665 bp COI fragment suitable for analysis. A total of 19 SNPs and 12 species-specific barcode sites were identified, indicating a distinct genetic signature in the Enggano population. Conserved sites were highly dominant (97.14%), while variable sites accounted for only 2.86%. Nucleotide composition analysis revealed a higher GC content (50.50%) than AT (49.47%). Genetic distance analysis showed 6 – 11.3% divergence between Psittacula longicauda modesta and other Psittacula species. Phylogenetic reconstruction placed all Enggano individuals in a well-supported monophyletic cluster (bootstrap value = 100), confirming their genetic separation from other parakeet species. These findings indicate low genetic diversity within the Enggano population, likely resulting from geographic isolation and small population size. The identified barcode sites underscore the strong diagnostic potential of the COI gene for molecular identification and taxonomic differentiation. Overall, this study establishes the first genetic baseline for Psittacula longicauda modesta, expands molecular resources available for the genus Psittacula, and provides valuable insights for conservation planning and taxonomic assessment of this endemic subspecies.
Pengenalan Berbagai Teknik Pembuatan Kompos di Sekolah Madrasah Aliyah Negeri (MAN) 1 Kota Bengkulu Darmi; Jarulis; Rizwar; Yulian Fauzi
JURNAL ABDIMAS SERAWAI Vol. 5 No. 3 (2025): Jurnal Abdimas Serawai (JAMS) - IN PROSES
Publisher : Program Studi Administrasi Fakultas Ilmu Sosial dan Ilmu Politik Universitas Muhammadiyah Bengkulu 

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36085/jams.v5i3.9317

Abstract

Abstrak:Permasalahan sampah organik di lingkungan sekolah seringkali belum tertangani secara optimal, padahal memiliki potensi besar untuk diolah menjadi pupuk organik yang bermanfaat. Kegiatan pengabdian masyarakat ini bertujuan untuk memperkenalkan berbagai teknik pembuatan kompos kepada siswa dan guru di Madrasah Aliyah Negeri (MAN) 1 Kota Bengkulu sebagai upaya peningkatan pengetahuan, keterampilan, dan kepedulian terhadap pengelolaan sampah organik. Kegiatan dilaksanakan pada tanggal 16 Desember 2022 di Aula MAN 1 Kota Bengkulu dengan melibatkan tiga dosen dan dua mahasiswa dari Universitas Bengkulu sebagai tim pelaksana. Metode kegiatan meliputi penyuluhan interaktif dan demonstrasi langsung pembuatan kompos menggunakan metode windrow. Evaluasi dilakukan melalui observasi terhadap partisipasi, antusiasme, serta kualitas pertanyaan yang diajukan oleh peserta selama kegiatan berlangsung. Hasil menunjukkan bahwa peserta, baik siswa maupun guru, menunjukkan minat yang tinggi dan pemahaman yang meningkat terhadap proses pengomposan, termasuk pemanfaatan bahan organik lokal dan pembuatan larutan mikroba alami sebagai pengganti EM4. Kegiatan ini berhasil meningkatkan literasi ekologi, kreativitas, dan keterampilan teknis peserta dalam mengolah limbah organik menjadi kompos. Selain itu, kegiatan ini turut mendukung visi sekolah untuk mewujudkan lingkungan yang bersih, hijau, dan berkelanjutan melalui penerapan konsep green school.
Co-Authors Adipraja Mahmuda Darmi Dwi Astuti Hery Haryanto Kamilah, Santi Nurul Karisma, Muhammad Aldiansyah LILIK BUDIPRASETYO Rizwar Taufik Setiawan Yeni A. Mulyani Yulian Fauzi