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All Journal Jurnal Biologi Tropis Journal of Natural Sciences Sriwijaya Bioscientia BIOVALENTIA: Biological Research Journal Jurnal Sylva Lestari
Yadi Oktariansyah
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Energy Environmental Science Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology

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Inventarisasi dan identifikasi tumbuhan dan insekta di sekitar kawasan Taman Firdaus Universitas Sriwijaya Indralaya, Sumatera Selatan Oktariansyah, Yadi; Harvianti, Yuniar; Pragustiandi, Guntur; Safitri, Ayu; Putri, Cyntia Sabarani; Iqbar, Muhammad
Sriwijaya Bioscientia Vol 4 No 2 (2023)
Publisher : Biology Department, Faculty of Mathematics and Natural Sciences, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24233/sribios.4.2.2023.456

Abstract

Penelitian untuk menginventarisasi dan mengidentifkasi tumbuhan dan insekta yang berada di kawasan taman Firdaus dan perkemahan bumi Universitas Sriwijaya, Indralaya dilaksanakan pada 16 November 2024. Penelitian ini bertujuan untuk mengetahui jenis-jenis tumbuhan dan insekta yang ada di kasawan tersebut. Penelitian dilakukan dengan cara eksploratif mulai dari Jurusan Biologi hingga kawasan tersebut. Hasil penelitian pada tumbuhan didapatkan 9 famili meliputi Aracaceae, Asteraceae, Dilleniaceae, Dryopteridaeae, Verbenaceae, Lamlaceae, Malvaceae, Combretaceae, Myrtaceae, dan Dilleniaceae, sedangkan pada insekta didapatkan Lycidae, Lycaenidae, Nymphalidae, Peridae, Libellulidae, Acrididae, Paradoxosomatidae, dan Spirostreptida.
A Physiological Status Affect Reptiles Thermoregulation’s Strategy: A Review Oktariansyah, Yadi
BIOVALENTIA: Biological Research Journal Vol. 11 No. 1 (2025)
Publisher : Biology Department, Faculty of Mathematics and Natural Sciences, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24233/biov.11.1.2025.459

Abstract

As an ectotherm class, reptiles' thermoregulation has unique mechanisms through the combination of physiological traits, behavioral adjustments, and environmental aspects. Reptiles need to do thermoregulation since their body temperature is affected by environmental aspects. Reptiles experience physiological status, which plays an important role in thermoregulatory behavior. This study explores the response of reptiles' thermoregulation strategy under various physiological states, representing facts about the complex thermoregulation mechanism. Specific physiological statuses such as life stage, reproduction status, immune and health system, dehydration, and digestive have been deeply explored by researchers to identify the effects of these traits on reptiles' thermoregulation strategies. These traits significantly affect reptiles' body temperature, such as having low Tb under the dehydration state and choosing higher Tb to promote food digestion under the digestive state. However, the consistency of these results may vary among reptile species that refer more to behavioral adjustment and mating process rather than physiological status. Different life stages and reproduction statuses also influence reptiles' thermoregulation strategy and implicate the evolutionary mechanism for gravid females to obtain a thermally suitable environment, especially for their embryos. Under behavioral adjustments, reptiles alter microhabitat selection to encounter low thermal environments such as water desiccation or climate change threats. Further research that combines physiological traits, behavioral adjustment, and environmental aspects through a biophysical model can contribute to demonstrating how thermoregulation strategies may compromise different physiological statuses. For reptiles, climate change is strongly associated with population loss. Therefore, this study with relevant topics may stand as a proxy for conservation regulation and policymakers to reduce unfavorable thermal environment aspects through habitat degradation.
Analysis of Soil Insect Diversity as Bioindicator of Post-Mining Land Reclamation Success Rate: Case Study at West Banko Area, PT Bukit Asam Kamal, Mustafa; Ramadhani, Audya Rahma; Oktariansyah, Yadi
BIOVALENTIA: Biological Research Journal Vol. 11 No. 1 (2025)
Publisher : Biology Department, Faculty of Mathematics and Natural Sciences, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24233/biov.11.1.2025.468

Abstract

Open-pit coal mining damages habitat, alters soil, and lowers biodiversity, therefore harming the ecosystem. Efforts at land reclamation involving topsoil restoration and regrowth are very vital for ecological recovery. This study uses soil insect diversity as a bioindicator of West Banko area PT Bukit Asam, South Sumatera, reclamation success. Soil insects were collected using combinations of soil extraction and forest floor collection methods along transect lines. Environmental factors like soil temperature, pH, humidity, and light intensity were measured to determine habitat conditions. Data demonstrates that Formicidae (Camponotus spp.) dominates the total of 154 soil insect individuals across eight genera, four families, and three orders. Considering excellent development in the restoration effort, the Shannon-Wiener diversity index (H') = 1.80656 indicates a minor degree of biodiversity. But the preponderance of monoculture Eucalyptus plants may limit insect diversity. increased soil humidity levels (60–80%) linked with increased insect population, therefore underlining the significance of soil moisture in the regeneration of ecosystems. The findings underline the need for different vegetation in reclamation strategies to help in better ecological balance and biodiversity. This study would be rather helpful for policymakers to focus on land restoration projects for ecologically acceptable post-mining ecosystem regeneration.
Analisis keanekaragaman serangga tanah sebagai bioindikator kesehatan ekosistem: studi kasus lahan gambut Desa Perigi, Ogan Komering Ilir, Sumatera Selatan Oktariansyah, Yadi; Kamal, Mustafa; Patricia, Margareth
Sriwijaya Bioscientia Vol 6 No 2 (2025)
Publisher : Biology Department, Faculty of Mathematics and Natural Sciences, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24233/sribios.6.2.2025.506

Abstract

Lahan gambut merupakan ekosistem penting yang berfungsi sebagai penyimpan karbon, pengatur tata air, dan habitat biodiversitas, namun rentan mengalami degradasi. Penelitian ini menginventarisasi keanekaragaman serangga tanah di lahan gambut Desa Perigi, Kecamatan Pangkalan Lampam, Kabupaten Ogan Komering Ilir, serta menilai potensinya sebagai bioindikator kesehatan ekosistem. Survei dilakukan pada Agustus 2023 di lima lokasi dengan karakteristik lingkungan berbeda; data dianalisis menggunakan indeks Shannon–Wiener (H’), dominansi (C), dan keseragaman (E). Hasil mencatat 165 individu yang tergolong dalam 12 spesies. Komunitas didominasi oleh Oides sp. (17,58%), Solenopsis invicta (17,58%), dan Gryllus bimaculatus (16,36%), sementara Lasius emarginatus (13,94%), Coelophora maculata (7,88%), dan Solenia sp. (7,88%) juga berkontribusi besar; Tetraphala collaris merupakan spesies dengan kelimpahan terendah (1,21%). Nilai H’ = 2,203 menunjukkan keanekaragaman sedang, dengan pola dominansi yang mengindikasikan kondisi ekosistem tertekan pada sebagian lokasi. Kehadiran spesies sensitif (Salina celebensis) pada mikrohabitat tertentu menandakan sebagian tapak masih relatif baik. Temuan ini menegaskan serangga tanah efektif sebagai bioindikator kesehatan ekosistem gambut dan relevan untuk pemantauan konservasi–restorasi.  
Biodiversity Patterns of Flora and Fauna in Mangrove Ecosystems under Anthropogenic Pressure in South Sumatra, Indonesia Sarno; Ikhsan, Muhammad; Desitarani; Oktariansyah, Yadi; Pragustiandi, Guntur
Jurnal Sylva Lestari Vol. 14 No. 1 (2026): January
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v14i1.1190

Abstract

Mangrove habitats serve vital functions; however, this habitat tends to face degradation affected by human activity. This study proposes to evaluate the diversity of flora and fauna in two mangrove habitats in South Sumatra, Indonesia: Banyuasin and Ogan Komering Ilir (OKI). Vegetation analysis was assessed using standard transect and plot-based methods, while fauna were recorded using a rapid assessment method. The results indicated that Banyuasin exhibited a superior flora diversity through a higher Shannon-Wiener Index (H' = 1.61) in contrast to OKI (H' = 1.04); however, the disparity was not statistically significant (p = 0.06). Banyuasin had a greater variety of mangrove trees, including Avicennia alba, Nypa fruticans, Sonneratia caseolaris, Kandelia candel, and Bruguiera gymnorrhiza, than OKI, which only had A. alba and S. caseolaris. In Banyuasin, fauna observations found three mammal species, 17 bird species, and 6 herpetofauna species, compared to one mammal, 16 birds, and 4 herpetofauna in OKI. Species such as Trachypithecus cristatus, Prionailurus sp., and Elanus caeruleus were only found in Banyuasin. These findings conclude that higher human activity in OKI may lead to biodiversity degradation. Therefore,  there is an urgent need for robust conservation policies and community-based management to preserve ecosystem services in the mangrove habitats of these regions. Keywords: biodiversity, conservation, mangrove, rapid assessment, vegetation analysis
Feed Efficiency and Growth Modeling of KUB Chicken: A Comparison Between Commercial and Alternative Feeds Oktariansyah, Yadi; Cahyani, Riski; Masito, Masito
Journal of Natural Sciences Vol 6, No 3 (2025): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i3.989

Abstract

Feed costs constitute a major expense in poultry production, emphasizing the need for efficient feeding strategies among smallholder farmers. The Ayam Kampung Unggul Balitbangtan (KUB) chicken is a promising native breed, yet limited research integrates feed efficiency with growth prediction modeling. This study evaluated commercial and alternative feed types while developing growth models. Twenty-five KUB chickens (~7 days old) were assigned to five dietary treatments: 100% commercial feed, 100% corn, 100% rice bran, 50% commercial + 50% corn, and 50% commercial + 50% rice bran, arranged in a completely randomized design with five replications. Body weight and feed conversion ratio (FCR) were recorded weekly for four weeks and analyzed using ANOVA. Nonlinear models (Exponential, Gompertz, Logistic) were applied for growth prediction. Feed type (F = 14.30, p 0.001), week (F = 292.68, p 0.001), and their interaction (F = 3.53, p 0.01) significantly affected body weight. The mixed diet of 50% commercial feed and 50% corn produced the highest final weight (228.8 g), while corn and rice bran diets resulted in lower growth. Logistic models best described balanced diets, whereas Exponential models reflected nutrient-limited growth, providing predictive insights aimed at enhancing feed strategies for smallholder farmers.
Genetic Diversity and Phylogenetic Relationships of Pometia pinnata Variants from South Sumatra Using RAPD Markers Hanum, Laila; Novira, Sandra; Oktariansyah, Yadi
Jurnal Biologi Tropis Vol. 25 No. 4b (2025): Special Issue
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i4b.10536

Abstract

Matoa (Pometia pinnata J.R. & G. Forst) is a tropical tree of the Sapindaceae family widely distributed in Southeast Asia, yet the genetic diversity and evolutionary relationships among its variants in South Sumatra remain poorly understood. This study aimed to clarify the genetic structure of four local variants forest, red, yellow, and green matoa using Random Amplified Polymorphic DNA (RAPD) markers. Leaf samples representing each variant were collected across different regions of South Sumatra and analyzed through standard molecular procedures, including DNA extraction and RAPD amplification using five primers. Cluster analysis based on Jaccard’s coefficient and UPGMA revealed two major genetic groups, indicating substantial variation among the studied variants. Red and yellow matoa showed the closest genetic affinity, whereas forest matoa was the most distinct from the others. These findings demonstrate considerable intraspecific diversity within matoa populations in South Sumatra. The study provides essential baseline information that strengthens conservation strategies, supports potential breeding programs, and enhances understanding of the species’ evolutionary patterns within tropical ecosystems.
Co-Authors Ayu Safitri Cahyani, Riski Desitarani Harvianti, Yuniar Iqbar, Muhammad Laila Hanum Masito, Masito Muhammad Ikhsan Mustafa Kamal Novira, Sandra Patricia, Margareth Pragustiandi, Guntur Putri, Cyntia Sabarani Ramadhani, Audya Rahma Sarno .