Article Per Year (5 Year)
p-Index From 2020 - 2025
0.61
P-Index
This Author published in this journals
All Journal Biopedagogia Biological Environment and Pollution Bioma : Jurnal Biologi dan Pembelajaran Biologi
Umar, Hardianto S
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Energy Environmental Science Other

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Diversity of Rare Tree Species in the Protected Forest of Tarakan Island Nugroho, Bimo Aji; Fauzi, Ahmad; Umar, Hardianto S
Biopedagogia Vol 6, No 1 (2024): Maret
Publisher : Program Studi Pendidikan Biologi Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/biopedagogia.v6i1.6299

Abstract

Since there is a dearth of information on the population of rare species in the Tarakan Island Protected Forest, this study intends to investigate the species diversity and distribution patterns of protected trees there. Determining the dominating rare tree species and the environmental factors influencing their distribution are among the issues that have been highlighted. The techniques involve statistical analysis to evaluate species diversity using the Shannon-Wiener index and field surveys to gather information on tree species, numbers, and habitat conditions. Five protected tree species with high levels of variety and balanced distribution—including Dipterocarpus cinereus and Intsia palembanica—were found in the results, demonstrating the resilience of the ecosystem. Climate, humidity, and soil quality are examples of abiotic variables that have a significant impact on tree development and spread. In summary, the occurrence of uncommon tree species is significantly influenced by the interplay between biotic and abiotic conditions, offering important information for Tarakan Island's biodiversity management and conservation. It is anticipated that this study will aid in the preservation of current natural resources.
Diversity and dominance of earthworms in relation to abiotic factors in the Southern Mountain Forest of Tarakan Island Palungana, Chrizt Jensen; Umar, Hardianto S; Nirmala, Adelya Setia; Nugroho, Bimo Aji
Biological Environment and Pollution Vol. 4 No. 2 (2024)
Publisher : Association for Scientific Computing, Electronics, and Engineering (ASCEE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31763/bioenvipo.v4i2.826

Abstract

Forest degradation continues to occur due to the expansion of agricultural land which disrupts its fauna. One of the fauna that faces threats is earthworms, earthworms play an important role as decomposers. This study aims to address the dearth of information on the diversity and dominance of earthworms and to compare their presence in two habitats, agricultural areas, and primary forests in the Gunung Selatan Forest area, Tarakan, and their relationship to abiotic factors. Sampling was conducted on agricultural land and primary forest using hand sorting techniques on plots measuring 30x30 cm, totaling six plots. The results showed that there were two types of earthworms, namely Lumbricus terrestris and Lumbricus rubellus. Researchers found 5 individuals of Lumbricus terrestris and 2 individuals of Lumbricus rubellus on agricultural land, 11 individuals of Lumbricus terrestris, and 7 individuals of Lumbricus rubellus in primary forest. Each worm sample's length and body researchersight varied depending on its location. The study found differences in the number and shape of earthworms living in agricultural land and primary forest habitats in the Gunung Selatan Forest area of Tarakan. More earthworms researchers found in primary forest habitats than in agricultural land. The study's results prove a relationship between abiotic factors and the life of earthworms, based on the measurement of parameters; the higher the temperature, air humidity, light intensity, and soil pH, the fewer worm species are obtained. Researchers anticipate these findings to offer valuable insights for managing and conserving ecosystems.
Analisis Morfometrik Udang Air Tawar Macrobrachium scabriculum di Daerah Aliran Sungai Gunung Selatan Tarakan Nugroho, Bimo Aji; Umar, Hardianto S; Palungan, Chrizt Jensen
Bioma : Jurnal Biologi dan Pembelajaran Biologi Vol. 10 No. 1 (2025): BIOMA: JURNAL BIOLOGI DAN PEMBELAJARAN BIOLOGI
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/bioma.v10i1.3000

Abstract

Perubahan ekositem menjadi ancaman bagi kehidupan udang dikawasasan aliran sungai gunung selatan. Meskipun telah dilakukan berbagai penelitian, informasi mengenai morfometrik M. scabriculum penting dilakukan untuk mengetahui perbedaan antar spesies di daerah aliran Sungai Gunung Selatan. Penelitian ini bertujuan untuk menganalisi morfometrik M. scabriculum dikawasan aliran sungai gunung selatan.  Pengambilan sampel di tiga lokasi yang berbeda dan melakukan pengukuran morfometrik, termasuk panjang total, panjang sefalotoraks, dan berat badan. Analisis pengukuran terdiri dari nilai rata-rata, rentang dan standar deviasi (±SE) dari setiap individu. Selanjutnya, hubungan panjang-berat udang dianalisi menggunakan regresi linier. Hasil penelitian menunjukkan bahwa rata-rata panjang keseluruhan jantan dan betina menunjukkan perbedaan yang cukup besar di antara kedua jenis kelamin.  Hasil ini menunjukkan bahwa jantan memiliki ukuran fisik yang lebih besar, yang mungkin meningkatkan keberhasilan reproduksi dan daya saing. Penelitian ini memberikan wawasan yang signifikan untuk pengelolaan dan konservasi sumber daya perairan.
Co-Authors Fauzi Ahmad Muda Nirmala, Adelya Setia Nugroho, Bimo Aji Palungan, Chrizt Jensen Palungana, Chrizt Jensen