MICROSATELLITE-BASED GENETIC VARIATION IN Rhizophora apiculata AND Rhizophora mucronata FROM EAST KALIMANTAN Adristi Shafa Widyasari, Abdul Razaq Chasani, Istiana Prihatini, Tri Atmoko, Mukhlisi, et al. Biotropia, 2026 ARTICLE HIGHLIGHTS- Microsatellite markers were used to study population genetic variation in Rhizophora- Molecular systematic analysis showed moderate genetic diversity with low heterozygosity- Population genetic structure was dominated by within-population variation (AMOVA)- Phenetic analyses revealed weak clustering among Rhizophora populations- Genetic patterns supported connectivity within Rhizoporaceae populations in East KalimantanABSTRACTMangroves of the family Rhizophoraceae are pantropical, with the genus Rhizophora forming a major component of tropical mangrove ecosystems. Rhizophora apiculata and Rhizophora mucronata are widely distributed in the Paser region, Balikpapan Bay, and the Mahakam Delta of East Kalimantan, Indonesia. This study examined genetic diversity and population structure of both Rhizophora species using simple sequence repeat (SSR) markers. The results showed moderate genetic diversity but relatively low heterozygosity in both species. Most genetic variation occurred within populations, as indicated by AMOVA, while R. apiculata exhibited lower genetic differentiation among populations and lacked private alleles, and R. mucronata showed higher population differentiation and possessed private alleles, suggesting localized genetic variation. Cluster and principal coordinate analyses revealed extensive overlap among populations for both species, indicating weak population structure and ongoing gene flow across the study area. Overall, the findings suggest that populations of R. apiculata and R. mucronata in East Kalimantan function as genetically connected units rather than as strongly differentiated populations. These results highlight the importance of maintaining habitat connectivity and protecting genetically unique populations to support the long-term resilience and sustainable management of mangrove genetic resources in East Kalimantan.
A pioneer study of orchids on Nusa Barung Island of Indonesia Allison Amavisca, Raghunath Belur, Sugandhi Gadadhar Journal of Threatened Taxa, 2025 We documented the distribution and habitat use of the Smooth-coated Otter Lutrogale perspicillata along the Cauvery and Kabini rivers in Karnataka, India. In November–December 2024, we conducted systematic surveys covering approximately 80–100 km of each river using trained volunteer teams. Data collection included direct sightings and indirect signs (spraints, tracks, and holts). The Cauvery survey yielded 68 observations, including 21 direct sightings totalling 76 individual otters (mean group size = 3.3). The Kabini survey documented 42 observations, including 12 direct sightings totalling 39 individuals (mean group size = 2.8). Statistical analyses revealed no significant difference in otter presence between areas with and without fishing activity (p = 0.428), challenging prior assumptions about human-otter conflict. Areas with multiple human activities maintained substantial otter presence, with 44.4% of holts found in areas with three different types of human activity.
Tree biodiversity in Bornean lowland forest: What are the key species for forest city development in the new capital city of Indonesia? Tri Atmoko, Bina Swasta Sitepu, Wahyu Catur Adinugroho, Mukhlisi, Tri Sayektiningsih, et al. Plos One, 2025 The national capital of Indonesia is in the early stages of relocation from the island of Java to East Kalimantan; Indonesia’s new capital city (Ibu Kota Negara; IKN) will be called Nusantara. The development of IKN will utilise the concept of a forest city representing the lowland forest of Borneo containing its rich biodiversity. To realize this concept, sufficient data and information regarding the status of tree diversity in this area is required. To provide this information, research was conducted in sample plots totaling 20.75 ha spread over eight locations in East Kalimantan. The selection of priority tree species for rehabilitation was carried out by using the Analytical Hierarchy Process (AHP) method with the criteria of conservation status, endemicity, climax species, distribution, food potential, ethnobotanical potential, animal food, and tree growth rates. In the sample plots, we found 5,745 trees representing 571 species with the family Dipterocarpaceae dominating, followed by Euphorbiaceae, Phyllanthaceae, Malvaceae and Annonaceae. Based on the priority categories of restoration, most of the species proposed for planting belong to the Dipterocarpaceae, in the genera Anisoptera (2 species), Anthoshorea (2 species), Cotylelobium (1 species), Dipterocarpus (3 species), Dryobalanops (1 species), Hopea (3 species), Richetia (3 species), Rubroshorea (7 species), Shorea (4 species), and Vatica (4 species). Hopea rudiformis is a Critically Endangered and Borneo endemic species with the highest score, and the only species included in 1st priority, followed by 14 species in 2nd priority, 62 species in 3rd priority, and the remainder in 4th priority. About 18% of tree species with potential food sources can be planted to meet the 10% target of forest cover to contribute to food security in IKN. Samboja Research Forest, Sungai Wain Protection Forest, and Bangkirai Hill are forested areas with high tree species diversity and can act as a source of seeds for the IKN nursery.
Camptostemon philippinensis, a new record of endangered mangrove species in the Balikpapan Bay, East Kalimantan, Indonesia Bina Swasta Sitepu, Abdul Razaq Chasani, Mukhlisi Mukhlisi, Tri Atmoko, Burhanuddin Adman, et al. F1000research, 2025 Background Camptostemon philippinensis, found in mangrove forests in Indonesia and the Philippines, is listed as endangered on the International Union for Conservation of Nature (IUCN) Red List. It is found primarily in isolated mangrove forests in Kalimantan (Indonesian Borneo) and Sulawesi in Indonesia. Despite significant studies on mangrove biodiversity in this region, the occurrence of C. philippinensis in Balikpapan Bay, East Kalimantan, is not extensively recorded. Methods The study was conducted by exploring the mangrove forests along Balikpapan Bay. The first survey of about 200 km was conducted to observe mangrove vegetation and found one C. philippinensis tree. The second survey focused on the area around the first discovered C. philippinensis tree to census and record its growth stage and distribution. Results The study recorded a population of 527 individuals of C. philippinensis in Pantai Lango Village, East Kalimantan, dominated by seedlings. The high number of seedlings indicates good natural regeneration potential, but the low number of trees indicates intense competition for space in a restricted habitat. This species inhabits a small and restricted area in Balikpapan Bay, in the middle area of Balikpapan Bay, and is associated with other mangrove flora, such as Rhizophora apiculata, Rhizophora mucronata, Sonneratia alba, Avicennia alba, Lumnitzera littorea, Osbornia octodonta, Ceriops tagal, and Xylocarpus granatum. Conclusions C. philippinensis is vulnerable to habitat damage from anthropogenic activities, which could lead to local extinction. Its natural habitat in Balikpapan Bay also has the potential to be under pressure due to the development of Indonesia’s new capital city (Ibu Kota Nusantara/IKN). It emphasizes the need to understand the ecological role of this protected flora in the natural habitat of protected fauna (the proboscis monkey). Documenting the population of C. philippinensis is crucial for conservation efforts, including propagation and understanding its ecological role.
A Chronicle of Indonesia’s Forest Management: A Long Step towards Environmental Sustainability and Community Welfare Hunggul Yudono Setio Hadi Nugroho, Yonky Indrajaya, Satria Astana, Murniati, Sri Suharti, et al. Land, 2023 Indonesia is the largest archipelagic country in the world, with 17,000 islands of varying sizes and elevations, from lowlands to very high mountains, stretching more than 5000 km eastward from Sabang in Aceh to Merauke in Papua. Although occupying only 1.3% of the world’s land area, Indonesia possesses the third-largest rainforest and the second-highest level of biodiversity, with very high species diversity and endemism. However, during the last two decades, Indonesia has been known as a country with a high level of deforestation, a producer of smoke from burning forests and land, and a producer of carbon emissions. The aim of this paper is to review the environmental history and the long process of Indonesian forest management towards achieving environmental sustainability and community welfare. To do this, we analyze the milestones of Indonesian forest management history, present and future challenges, and provide strategic recommendations toward a viable Sustainable Forest Management (SFM) system. Our review showed that the history of forestry management in Indonesia has evolved through a long process, especially related to contestation over the control of natural resources and supporting policies and regulations. During the process, many efforts have been applied to reduce the deforestation rate, such as a moratorium on permitting primary natural forest and peat land, land rehabilitation and soil conservation, environmental protection, and other significant regulations. Therefore, these efforts should be maintained and improved continuously in the future due to their significant positive impacts on a variety of forest areas toward the achievement of viable SFM. Finally, we conclude that the Indonesian government has struggled to formulate sustainable forest management policies that balance economic, ecological, and social needs, among others, through developing and implementing social forestry instruments, developing and implementing human resource capacity, increasing community literacy, strengthening forest governance by eliminating ambiguity and overlapping regulations, simplification of bureaucracy, revitalization of traditional wisdom, and fair law enforcement.
Can Humans and Elephants Coexist? A Review of the Conflict on Sumatra Island, Indonesia Wanda Kuswanda, Raden Garsetiasih, Hendra Gunawan, Rospita Odorlina Pilianna Situmorang, Freddy Jontara Hutapea, et al. Diversity, 2022 The high rate of deforestation and fragmentation of elephant habitat on Sumatra Island has triggered human-elephant conflict (HEC) in Sumatra Island, Indonesia. This conflict brings negative impacts on humans and elephants. Despite numerous efforts having been made to solve this problem, the HEC continues to occur in the remaining elephant enclave every year. The harmonious coexistence between humans and elephants could be improved through HEC mitigation programs. The aim of this paper was to review information on HEC in Sumatra Island, investigate the causes and implications of HEC, review existing HEC mitigation methods, and formulate strategies to improve the harmonious coexistence between humans and elephants. The best strategies to create successful human and elephant coexistence are strengthening the institutions and policies, restoring the habitat, developing wildlife corridors, establishing Essential Ecosystem Areas (EEA), community empowerment through ecotourism, providing legal access to forests through Social Forestry (SF), and providing compensation schemes for conflict victims.
Abundance and nutrient content of some food plants in Sumatran rhino habitat in the forest of Kutai Barat, East Kalimantan, Indonesia Pachyderm, 2017
RECENT SCHOLAR PUBLICATIONS
MICROSATELLITE-BASED GENETIC VARIATION IN Rhizophora apiculata AND Rhizophora mucronata FROM EAST KALIMANTAN AS Widyasari, AR Chasani, I Prihatini, T Atmoko, B Adman, BS Sitepu BIOTROPIA 33 (2), 169-180 , 2026 2026
Keanekaragaman Tumbuhan Mangrove di Teluk Balikpapan dan Delta Mahakam, Provinsi Kalimantan Timur. MH Haydar, T Atmoko, I Prihatini, AR Chasani Berkala Ilmiah Biologi 16 (2) , 2025 2025
A pioneer study of orchids on Nusa Barung Island of Indonesia T Artaka, BS Sitepu, FDN Aji, T Atmoko Journal of Threatened Taxa 17 (6), 27110-27115 , 2025 2025
Tree biodiversity in Bornean lowland forest: What are the key species for forest city development in the new capital city of Indonesia? T Atmoko, BS Sitepu, WC Adinugroho, Mukhlisi, T Sayektiningsih, ... PloS one 20 (4), e0320489 , 2025 2025 Citations: 1
Camptostemon philippinensis, a new record of endangered mangrove species in the Balikpapan Bay, East Kalimantan, Indonesia BS Sitepu, AR Chasani, M Mukhlisi, T Atmoko, B Adman, I Prihatini F1000Research 12, 1394 , 2025 2025 Citations: 6
Wings Above Wilderness: Diversity and Ecological Significance of Winged Vertebrates in Nusa Barung Island Wildlife Reserved, East Java, Indonesia T Atmoko, W Mukhlisi, FDN Aji, O Hidayat, BS Sitepu, T Artaka, ... 2025
A review of forest fragmentation in Indonesia under the DPSIR framework for biodiversity conservation strategies H Gunawan, T Setyawati, T Atmoko, RT Kwatrina, I Yeny, TW Yuwati, ... Global Ecology and Conservation 51, e02918 , 2024 2024 Citations: 56
Population status of proboscis monkeys in Balikpapan Bay and their potential survival challenges in Nusantara, the proposed new capital city of Indonesia T Atmoko, T Toulec, S Lhota, Darman Environmental Monitoring and Assessment 196 (2), 107 , 2024 2024 Citations: 12
A review of forest fragmentation in Indonesia under the DPSIR framework for biodiversity conservation strategies. Glob Ecol Conserv 51: e02918 H Gunawan, T Setyawati, T Atmoko, A Subarudi, RT Kwatrina, I Yeny, ... 2024 Citations: 5
BAB 1 Melindungi dan Memanfaatkan Kekayaan Sumber Daya Satwa Primata Indonesia T Atmoko 2024
Mengenal Lebih Dekat Satwa Langka Indonesia dan Memahami Pelestariannya T Atmoko, H Gunawan, AY Widyatmoko, AD Setiyani, BW Broto, DID Arini, ... Penerbit BRIN , 2023 2023 Citations: 2
A chronicle of Indonesia’s forest management: a long step towards environmental sustainability and community welfare HYSH Nugroho, Y Indrajaya, S Astana, Murniati, S Suharti, TM Basuki, ... Land 12 (6), 1238 , 2023 2023 Citations: 30
Bab 1 Kekayaan Jenis Satwa Liar di Zoogeografi Wilayah Indonesia T Atmoko 2023
Can humans and elephants coexist? A review of the conflict on Sumatra Island, Indonesia W Kuswanda, R Garsetiasih, H Gunawan, ROP Situmorang, FJ Hutapea, ... Diversity 14 (6), 420 , 2022 2022 Citations: 42
Bird’s species response to the ex-coal mining reclamation stages T Atmoko, AW Nugroho, Mukhlisi IOP Conference Series: Earth and Environmental Science 1027 (1), 012009 , 2022 2022
The diversity of plant species in the proboscis monkey’s habitat as a species reference for habitat restoration T atmoko 2022 Citations: 4
Aplikasi disain komposit pusat pada proses pengecatan mobil bekas AN Sonjaya, K Hervito, T Atmoko Jurnal Teknologi 8 (2), 143-156 , 2021 2021 Citations: 6
Avifauna in the Wehea-Kelay Landscape, East Kalimantan, Indonesia Mukhlisi, MA Rifqi, T Atmoko, Purnomo, A Chayatuddin, L Yen, ... IOP Conference Series: Earth and Environmental Science 743 (1), 012034 , 2021 2021 Citations: 1
Land cover and Proboscis monkey habitats in Berau Delta, East Kalimantan T Atmoko, A Mardiastuti, M Bismark, LB Prasetyo, E Iskandar IOP Conference Series: Earth and Environmental Science 739 (1), 012062 , 2021 2021 Citations: 1
Populasi dan sebaran bekantan (Nasalis larvatus) di Delta Berau T Atmoko, A Mardiastuti, M Bismark, LB Prasetyo, E Iskandar Jurnal Penelitian Kehutanan Wallacea 10 (1), 11-32 , 2021 2021 Citations: 7
MOST CITED SCHOLAR PUBLICATIONS
Uji Toksisitas dan Skrining Fitokimia Ekstrak Tumbuhan Sumber Pakan Orangutan terhadap Larva Artemia salina L.(Toxicity Testing and Phytochemical Screening of Orangutan Food … T Atmoko, A Ma’ruf Jurnal Penelitian Hutan dan Konservasi Alam 6 (1), 37-45 , 2009 2009.0 Citations: 97
A review of forest fragmentation in Indonesia under the DPSIR framework for biodiversity conservation strategies H Gunawan, T Setyawati, T Atmoko, RT Kwatrina, I Yeny, TW Yuwati, ... Global Ecology and Conservation 51, e02918 , 2024 2024.0 Citations: 56
Can humans and elephants coexist? A review of the conflict on Sumatra Island, Indonesia W Kuswanda, R Garsetiasih, H Gunawan, ROP Situmorang, FJ Hutapea, ... Diversity 14 (6), 420 , 2022 2022.0 Citations: 42
A chronicle of Indonesia’s forest management: a long step towards environmental sustainability and community welfare HYSH Nugroho, Y Indrajaya, S Astana, Murniati, S Suharti, TM Basuki, ... Land 12 (6), 1238 , 2023 2023.0 Citations: 30
Potensi regenerasi dan penyebaran Shorea balangeran (Korth.) Burck di sumber benih Saka Kajang, Kalimantan Tengah T Atmoko Jurnal Penelitian Ekosistem Dipterokarpa 5 (2), 21-36 , 2011 2011.0 Citations: 24
Bekantan Kuala Samboja ‘Bertahan dalam Keterbatasan’ T Atmoko http://www.forda-mof.org/files/Buku-bekantan.pdf 1, 60 , 2012 2012.0 Citations: 23
STRATEGI PENGEMBANGAN EKOWISATA PADA HABITAT BEKANTAN (Nasalis larvatus Wurmb.) DI KUALA SAMBOJA, KALIMANTAN TIMUR (Strategy for Ecotourism Development in Proboscis Monkey … T Atmoko Jurnal Penelitian Hutan Dan Konservasi Alam, VII 4, 425-437 , 2010 2010.0 Citations: 20
Hutan mangrove dan peranannya dalam melindungi ekosistem pantai T Atmoko, K Sidiyasa Hutan Mangrove Dan Peranannya Dalam Melindungi Ekosistem Pantai, 92-99 , 2007 2007.0 Citations: 20
Keragaman Morfologi, Ekologi, Pohon Induk, dan Konservasi Ulin (Eusideroxylon Zwageri Teijsm. Et Binnend.) di Kalimantan K Sidiyasa, T Atmoko, A Ma'ruf, M Mukhlisi Jurnal Penelitian Sosial dan Ekonomi Kehutanan 10 (3), 241-254 , 2013 2013.0 Citations: 18
Habitat suitability of proboscis monkey (Nasalis larvatus) in Berau delta, East Kalimantan, Indonesia TRI Atmoko, ANI Mardiastuti, M Bismark, LB Prasetyo, E Iskandar Biodiversitas 21 (11), 5155-5163 , 2020 2020.0 Citations: 17
Karakteristik vegetasi habitat bekantan (Nasalis larvatus Wurmb) di Delta Mahakam, Kalimantan Timur T Atmoko, K Sidiyasa Jurnal Penelitian Hutan dan Konservasi Alam 5 (4), 307-316 , 2008 2008.0 Citations: 15
PERSEPSI MASYARAKAT TERHADAP PEMBANGUNAN PENANGKARAN RUSA SAMBAR (Cervus unicolor Kerr, 1792) DI KHDTK SAMBOJA, KALIMANTAN TIMUR (The Community’s Perception on Sambar Deer … T Sayektiningsih, T Atmoko, A Ma’ruf Jurnal penelitian hutan dan konservasi alam 11 (2), 143-153 , 2014 2014.0 Citations: 14
Struktur dan sebaran tegakan Dipterocarpaceae di sumber benih Merapit, Kalimantan Tengah T Atmoko, Z Arifin, P Priyono Jurnal Penelitian Sosial dan Ekonomi Kehutanan 8 (4), 399-413 , 2016 2016.0 Citations: 13
Population status of proboscis monkeys in Balikpapan Bay and their potential survival challenges in Nusantara, the proposed new capital city of Indonesia T Atmoko, T Toulec, S Lhota, Darman Environmental Monitoring and Assessment 196 (2), 107 , 2024 2024.0 Citations: 12
Struktur kelompok dan penyebaran bekantan (Nasalis larvatus Wrumb.) di Kuala Samboja, Kalimantan Timur T Atmoko, A Mardiastuti, E Iskandar Seminar Ilmiah Nasional Ekologi dan Konservasi–Makassar, 20-21 , 2013 2013.0 Citations: 11
Komunitas habitat bekantan (Nasalis larvatus Wurmb) pada areal terisolasi di Kuala Samboja, Kalimantan Timur T Atmoko, A Mardiastuti, E Iskandar Jurnal Penelitian Sosial dan Ekonomi Kehutanan 11 (2), 127-141 , 2014 2014.0 Citations: 10
Habitat dan Populasi Ki Beusi (Pongamia pinnata (L.) Pierre) dan Kampis (Hernandia nymphaeifolia Kubitzki) di Kalimantan Timur K Sidiyasa, BS Sitepu, T Atmoko Prosiding Seminar Hasil-Hasil Penelitian BPTKSDA Samboja , 2012 2012.0 Citations: 10
Noorcahyati. 2007. Potensi dan Hambatan Pengelolaan Kawasan Hutan Dengan Tujuan Khusus (KHDTK) Penelitian Samboja WC Adinugroho, D Setiabudi, W Gunawan, T Atmoko Prosiding Seminar Bersama Hasil-hasil Penelitian 3 , 0 Citations: 10
Praktik Terbaik Pengelolaan Habitat Satwa Terancam Punah dalam Skala Bentang Alam: Sebuah Pembelajaran dari Kawasan Ekosistem Esensial Wehea-Kelay T Atmoko, E Sudiono, MA Rifqi, AP Dharma IPB Press: Bogor, Indonesia , 2021 2021.0 Citations: 9
Struktur dan Komposisi Vegetasi Hutan Mangrove di Pulau Benawa Besar, Teluk Balikpapan, Kalimantan Timur T Sayektiningsih, A Ma’ruf, T Atmoko Prosiding seminar hasil-hasil penelitian BPTKSDA Samboja, 115-123 , 2012 2012.0 Citations: 8
