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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology Jurnal Biodjati Berita Biologi
Sitepu, Bina Swasta
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Immunology & microbiology Veterinary

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KERAGAMAN JENIS POHON DI ARBORETUM TABANG, KALIMANTAN TIMUR Sitepu, Bina Swasta; Suharja, Iman; Priyono, Priyono; Wibisono, Yusub; Warsidi, Warsidi; Teguh, Teguh; Laban, Banjar Yulianto; Wahyudin, Wahyudin; Yassir, Ishak
Berita Biologi Vol 22 No 1 (2023): Berita Biologi
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/beritabiologi.2023.800

Abstract

Arboretum Tabang merupakan salah satu areal perlindungan plasma nutfah khususnya jenis flora pohon asli Kalimantan yang dibangun oleh PT. Bara Tabang. Arboretum ini terletak di wilayah Kutai Tengah yang masih minim informasi jenis flora namun menghadapi perubahanan fungsi lahan berhutan secara masif. Penelitian ini bertujuan untuk memberikan data jenis pohon di Arboretum Tabang sebagai tahap awal perencanaan pengelolaan kawasan. Inventarisasi jenis pohon dengan metode sensus dilakukan di kawasan arboretum seluas 2 ha pada tahun 2021. Secara keseluruhan, ditemukan 839 tegakan pohon dari 210 jenis. Suku Dipterocarpaceae memiliki jumlah jenis terbanyak di areal ini diikuti oleh suku Moraceae dan Lauraceae. Namun, Macaranga gigantea dan Euphorbiaceae lebih dominan berdasarkan nilai Luas Bidang Dasar (LBD). Sebanyak 19 jenis pohon diketahui memiliki nilai konservasi tinggi berdasarkan aturan perundangan nasional dan IUCN Redlist. Potensi biomassa di dalam kawasan adalah sebanyak 193,33 ton dan potensi karbon sebesar 104,48 ton. Keanekaragaman jenis pohon di arboretum Tabang potensial sebagai areal sumber benih atau bibit untuk kegiatan reklamasi dan revegetasi lahan pasca tambang batu bara dan juga sumber plasma nutfah untuk lanskap Kutai Tengah.
Vegetation Structure, Composition, and Soil Properties of Dry Land on Islands in Balikpapan Bay, East Kalimantan Sayektiningsih, Tri; Sitepu, Bina Swasta; Yassir, Ishak; Sari, Ulfah Karmila; Mukhlisi, Mukhlisi; Ma'ruf, Amir
Jurnal Biodjati Vol 5 No 2 (2020): November
Publisher : UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/biodjati.v5i2.6434

Abstract

   Some small islands in Balikpapan Bay consist of dry land which may have different vegetation structure and composition. Our study was the first to uncover vegetation conditions and soil proper-ties of dry land on small islands in Balikpapan Bay, which has never been conducted before. The research was carried out on Kalawasan and Karantina islands. Information on vegetation was obtained by applying a line transect method. Data on soil properties were col-lected by setting up 3 sampling plots in each transect of vegetation. Parameters used for analysing vegetation including relative densi-ty, relative frequency, relative dominance, Shannon-Wiener diversi-ty index, evenness index, and similarity index. Meanwhile, data on soils were analysed descriptively. Trees on Kalawasan island were comprised of 241 individuals belonging to 21 species. There were 61 individuals (22 species) of trees on Karantina island. The diver-sity index of trees on Kalawasan and Karantina island was 2.55 and 2.72, respectively. The tree evenness index was 0.84 on Kalawasan island and 0.88 on Karantina island. The index of similarity for trees between the two islands was 0.21. Furthermore, the soil character-istics on Kalawasan and Karantina islands showed similarities. In general, soil in Kalawasan and Karantina islands could be catego-rised as marginal soil which was common in East Kalimantan. Con-sidering the rapid loss of tropical forests in the mainland of Kali-mantan indicates that the small islands of Balikpapan Bay play an important role in future biodiversity conservation in East Kalimantan. 
MICROSATELLITE-BASED GENETIC VARIATION IN Rhizophora apiculata AND Rhizophora mucronata FROM EAST KALIMANTAN Widyasari, Adristi Shafa; Chasani, Abdul Razaq; Prihatini, Istiana; Atmoko, Tri; Mukhlisi; Adman, Burhanuddin; Sitepu, Bina Swasta
BIOTROPIA Vol. 33 No. 2 (2026): BIOTROPIA Vol. 33 No. 2 May 2026
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2026.33.2.2715

Abstract

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.
Co-Authors Abdul Razaq Chasani, Abdul Razaq Burhanuddin Adman Ishak Yassir Istiana Prihatini, Istiana Laban, Banjar Yulianto Ma'ruf, Amir Mukhlisi Mukhlisi Mukhlisi Priyono Priyono Sari, Ulfah Karmila Suharja, Iman Teguh Teguh Tri Atmoko Tri Sayektiningsih Wahyudin Wahyudin Wibisono, Yusub Widyasari, Adristi Shafa