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Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences
Published by Universitas Brawijaya
ISSN : 20875517     EISSN : 25274376     DOI : -
Core Subject : Agriculture, Social,
Agriculture, Biological Sciences & Forestry Environmental Science
The Journal of Tropical Life Science (JTLS) provides publication of full-length papers, short communication and review articles describing of new finding or theory in living system, cells and molecular level in tropical life science and related areas. The journal publishes articles that report novel findings of wide Tropical Life system phenomenon in the areas of biodiversity, agriculture, fisheries, health, husbandry, forestry and environmental technology. JTLS has 1 volume with 3 issues per year.
Arjuna Subject : -
Articles 1,021 Documents
 99   100   101   102   103 
Analysis Distribution Patterns and Correlation of Ecological Characteristics Affecting the Existence of the Maleo Birds (Macrocephalon maleo) in Central Sulawesi, Indonesia: Distribution and Ecological Drivers of Maleo in Central Sulawesi Abd. Karim , Wahyudin; Hadisusanto, Suwarno; Wibawaning Astuti, Raden Roro Upiek Ngesti; Pudyatmoko, Satyawan
Journal of Tropical Life Science Vol. 16 No. 01 (2026)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.16.01.08

Abstract

Macrocephalon maleo is an endemic bird species of Sulawesi that selects nesting sites based on specific environmental conditions, particularly optimal soil temperature, moisture, water content, soil weight, and texture (including clay, dust, and sand composition). However, studies examining the relationship between soil physical characteristics and microclimatic factors across multiple nesting sites remain limited. This study aims to analyze the distribution patterns and the correlation of ecological characteristics that influence the existence of maleo in Central Sulawesi. The research was conducted from February 2024 to March 2025 at seven locations with a total of 23 coordinate points, including nesting grounds near geothermal sources (Saluki, Lore Lindu National Park), coastal areas (Taima, Moilong, Batui, Ampana, and Balingara), and a riverbank area (Bukit Jaya). Field observations were carried out for 10 days at each location, during which 197 maleo birds were recorded. Maleo distribution patterns were analyzed using the Morisita Index, while the relationships between ecological factors and maleo presence were assessed using Pearson correlation analysis. The Morisita Index indicates a clumped distribution pattern, with values ranging from 2.0 to 5.0. The average sand temperatures recorded were 33.9°C in the geothermal area (Saluki TNLL); 35.0°C, 34.4°C, 35.4°C, 33.13°C, and 32.9°C in the coastal areas (Taima, Moilong, Batui, Ampana, and Balingara), and 36.1°C in the riverbank area (Bukit Jaya). The results indicate that soil-related ecological factors, particularly water content, soil texture, and sand weight, had a stronger influence on maleo presence than ambient microclimatic variables such as air temperature, humidity, wind speed, and light intensity. Soil texture influences water retention, aeration, heat absorption, and soil consistency. Sandy soils tend to absorb and release heat efficiently, thereby creating suitable incubation conditions for maleo eggs in natural nesting habitats.
Community Structure and Ecological Roles of Soil Macrofauna in Sumatran Elephant Feces as an Effort to Conserve Soil Biodiversity in Bengkulu Elephant Training Center, Indonesia: Community Structure and Ecological Roles of Soil Macrofauna in Sumatran Elephant Feces Darmi, Darmi; Rizwar, Rizwar; Warosuly, Tri Nurhidayati; Julita, Helika
Journal of Tropical Life Science Vol. 16 No. 01 (2026)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.16.01.09

Abstract

Elephant feces are a source of organic material that has the potential to support soil ecosystem sustainability. Elephant feces serve as a microhabitat, providing nutrients and a place to live for soil macrofauna that plays an important role in soil decomposition. However, the understanding of the community structure and ecological contribution of macrofauna in elephant feces is still limited, especially in the Bengkulu Elephant Training Center area. The objective of this study was to analyze the community structure and ecological roles of soil macrofauna in Sumatran elephant feces at the Seblat Elephant Conservation Area. Soil macrofauna in elephant feces is divided into two groups, namely Macroarthropods and Oligochaeta (Megadrilli earthworms). Macroarthropod samples were collected using the handsorting method on each bolus of feces, while earthworms were collected using the square method and the handsorting method on feces that had undergone further decomposition. The community structure of soil macrofauna in elephant feces consists of 18 species. Arthropoda comprises 15 species belonging to the classes Hexapoda, Arachnida, Crustacea, and Diplopoda. Trigoniulus corallinus is a dominant macroarthropod species with an absolute category (very frequently found) and a wide distribution in elephant feces.  Oligochaeta consists of three species of megadrilli earthworms, namely Pontoscolex corethrurus, Drawida sp., and Pheretima  Javanica.  Drawida sp. have the highest density and were classified as constant (frequently found) in elephant feces. The Shannon-Wiener and Simpson’s diversity indices for soil macroarthropods are relatively high, whereas those for Oligochaeta are low. Based on ecological roles, soil macroarthropods consist of detritivores, omnivores, predators, and herbivores. Detritivores are dominant in elephant feces. Among the Oligochaeta, epigeic earthworms are more dominant than endogeic earthworms. The presence of elephant dung in the central area of the Elephant Training Center is a means of conserving soil biodiversity, thereby contributing to improving soil quality and fertility.
Community Structure, Biodiversity, and Seasonal Dynamics of Dinoflagellates in the Tropical Hooghly River Estuarine Waters near the Bay of Bengal: Seasonal Dynamics of Dinoflagellates in Hooghly River Biswas, Goutam; Kumar Saha , Samir
Journal of Tropical Life Science Vol. 16 No. 01 (2026)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.16.01.11

Abstract

Dinoflagellates are an important community of phytoplankton in estuaries and respond strongly to seasonal environmental changes. Regular field sampling was conducted to document species composition, seasonal fluctuations, dinoflagellate diversity, and various environmental factors in the tropical Hooghly River estuarine water (West Bengal, India). The pre-monsoon season revealed maximum diversity (H' = 2.603) and species richness (D = 3.605), while the highest dinoflagellate species observations were made in the post-monsoon season. Non–metric multidimensional scaling (NMDS) ordination revealed clear spatial heterogeneity among the study sites, with Site 3 being ecologically distinct and relatively more productive in terms of environmental conditions and dinoflagellate species composition. Spearman's correlation analyses showed temperature (ρ = −0.894, p < 0.001), salinity (ρ = 0.476, p < 0.001), TDS (ρ = 0.553, p < 0.001), nitrate content (ρ = −0.748, p < 0.001), and Chl-a (ρ = 0.833, p < 0.001) were strongly correlated with the numerical abundance of all dinoflagellates. Canonical Correspondence Analysis (CCA) showed how changes in physicochemical parameters across all seasons affect dinoflagellate assemblage, seasonal distribution, and composition in Hooghly estuarine waters. Temperature, salinity, and nutrient contents are the primary factors influencing the regulation and proliferation of different dinoflagellate species. Presence of potentially toxic (Dinophysis spp.) and harmful dinoflagellate species (Tripos fusus, Tripos furca, Pyrophacus spp.) remains a concern for Harmful Algal Blooms (HAB). A consistent rise in salinity levels in the river water poses an alarming threat to the ecological health of the estuary and its long-term viability.
Comprehensive In-silico Pharmacodynamic and Pharmacokinetics of Phytochemicals from Newbouldia laevis : In-silico Pharmacodynamic and Pharmacokinetics of Newbouldia laevis Adekilekun, Habeebulahi Ajibola; Oyewusi, Habeebat Adekilekun; Huyop, Fahrul; Igbinoba, Sharon; Odoma, Saidi; Onohuean, Hope; Guna,, Ida Bagus Wayan
Journal of Tropical Life Science Vol. 16 No. 01 (2026)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.16.01.12

Abstract

Medicinal plants with the therapeutic properties like Newbouldia laevis, where its pharmacological attribute is related to the existence of various bioactive compounds. This present study evaluates the physicochemical, drug likeness, pharmacokinetic factors (ADMET), pharmacodynamic factors (biological activity) and pharmacophore analysis of N. laevis phytochemicals by instrumentation of in-silico computational online webservers including SwissADME and ADMETlab2, ProToxII and StopTox, PASS online and ZINCPharmar webservers. The study revealed that 47 phytochemicals were identified from Newbouldia laevis based on the literature search. Based on our findings the 3-Dimentional (3D) structures and canonical SMILES identity of 40 and 44 respectively out of 47 phytochemicals that were found documented at PubChem and ChemSpider databases. Therefore, further analysis was based on the phytochemicals with the reported 3D structures and canonical SMILES identity. All the investigated N. laevis phytochemicals obey Lipinski's rule of five (RO5) except Newbouldiamide, stigmasterol glucoside and beta-sitosterol-3-O-D-Glucopyranoside. The present study disclosed that almost all phytochemicals tend to show decent smooth membrane permeability, oral bioavailability, and high gastrointestinal absorption in human gut. Moreover, these phytochemicals showed excellent bioactivity of enzyme inhibition for treatment of various diseases especially cancer. Lastly, the pharmacophore study revealed the functional descriptors in which almost all the phytochemicals one or more H bond donors, H bond acceptors, aromatic group, and hydrophobic bonds were identified as common descriptors except 1,2,3,4-Butanetetrol. Hence, in-silico results permit us to agree that identified phytochemicals from N. laevis are predicted to be a prospective upcoming drug candidate, particularly through oral administration, owing to its germane Drug-likeness profile, excellent liposolubility, bioavailability, and adequate bioactivity, pharmacokinetics, and pharmacological profile.
Phenotypic and Genotypic Characterization of Tetracycline-Resistant Bacteria Isolated from Brantas River, Malang Raya and Their Biofilm Formation Ability: Phenotypic and Genotypic Characterization of Tetracycline-Resistant Bacteria Mahira, Syarafin; Yoga Dwi Jatmiko; Maharani Pertiwi Koentjoro
Journal of Tropical Life Science Vol. 16 No. 01 (2026)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.16.01.14

Abstract

Antibiotic resistance in aquatic environments has become an important public health concern due to the spread of antibiotic-resistant bacteria (ARB) through river water, which provides favorable conditions for biofilm formation and enables bacteria to survive environmental stresses, including antibiotic exposure. The Brantas River water is still widely used for household activities, increasing the potential dissemination of bacteria through water exposure. This study aims to determine the phenotypic characteristics, identify tetracycline-resistant bacterial species using 16S rRNA gene sequencing, and analyze the level of biofilm formation and cell density within the biofilm by tetracycline-resistant bacterial isolates. Tetracycline-resistant isolates were phenotypically characterized and identified using 16S rRNA gene sequencing. Detection of tetracycline resistance genes was performed by Polymerase Chain Reaction (PCR). Biofilm formation ability was evaluated using the crystal violet (CV) assay in Tryptic Soy Broth (TSB) and Brantas River water, exopolysaccharide (EPS) extraction, and then the cell density in the biofilm was calculated using Total Plate Count (TPC). Isolates TET-15.1 and TET-40.1 were found to be resistant to all four concentrations. Identification results showed similarities between TET-15.1 with Alcaligenes faecalis; and TET-40.1 with Serratia sp. The resistant genes found in both isolates were tet(S) and tet(B). Alcaligenes faecalis TET-15.1 had the highest biofilm formation ability and higher EPS production than Serratia sp. TET-40.1, with OD584 values ranging from 1.5 to 2.25 and EPS concentration of 4 – 5 mg/mL at tetracycline concentration of 8 μg/mL. The biofilm formation cycle reached maturity after 16 hours of incubation and then dispersed after 32 hours. These findings indicate that tetracycline-resistant bacteria from the Brantas River possess biofilm forming capabilities that may contribute to their environmental persistence and potential role in the dissemination of antibiotic resistance.
Phylogenetic and Genetic Diversity of Local Durian (Durio spp.) from Siberut Island within Southeast Asia: Insights from rbcL and ITS Markers: Phylogenetic and Genetic Diversity of Local Durian from Siberut Island Alponsin; Mansyurdin; Nurainas
Journal of Tropical Life Science Vol. 16 No. 01 (2026)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.16.01.13

Abstract

This study examined the genetic diversity and phylogenetic relationships of Durio species from Siberut Island, Indonesia, within the broader Southeast Asian context, utilizing two molecular markers: rbcL and ITS. Leaf samples underwent DNA sequencing, followed by genetic distance estimation, phylogenetic reconstruction, and haplotype network analysis. The ITS marker exhibited high discriminatory power, effectively differentiating species and revealing distinct haplotype variation among populations, while resolving distinct clades with strong bootstrap support. Conversely, the rbcL marker, being highly conserved, provided reliable resolution at the genus level but was inadequate for distinguishing closely related species. A significant finding is the close genetic affinity between the wild variety Toktuk Geta from Siberut and D. singaporensis, a species previously recorded in Peninsular Malaysia. This association may indicate an unrecognized lineage or historically disjunct distribution, although confirmation necessitates broader sampling and additional markers. Substantial genetic differentiation was observed among D. zibethinus populations across Southeast Asia (FST = 0.49293), aligning with restricted gene flow among geographically distinct populations. These findings suggest that ITS is a suitable marker for species-level phylogenetics in Durio, whereas rbcL is more appropriate for genus-level identification. The unique genetic composition of Durio germplasm on Siberut Island highlights the conservation value of this region for plant genetic resources in the Mentawai Archipelago.
In Silico Drug Discovery Identifies Stigmasterol from Red Betel (Piper crocatum Ruiz & Pav) Stem as a Potential Antidiabetic Agent Sari, Putri Kharisma Novita; Febyaningrum, Vitasigi Dwi
Journal of Tropical Life Science Vol. 16 No. 2 (2026)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.16.02.02

Abstract

Type 2 diabetes (T2DM) is a metabolic disorder caused by insufficient insulin secretion and the inability of tissues to respond to insulin. Therapy can include the use of insulin in conjunction with other glucose-lowering agents, but these drugs have several limitations related to efficacy, tolerability, and potential side effects. The use of herbal medicines has begun to develop as a therapeutic option, including stigmasterol. Stigmasterol, which has been successfully isolated from several plants, has demonstrated antidiabetic activity in both in vivo and in vitro studies. This study aimed to conduct a comprehensive exploration of the potential, mechanism of action, protein targets, and profile of stigmasterol found in red betel stem as a candidate natural antidiabetic agent in silico. The results of this study indicate that stigmasterol has potential as a drug candidate for the therapy of T2DM with a predicted limited level of toxicity. Computational analyses suggest that stigmasterol may possess therapeutic potential against T2DM by regulating biological processes associated with insulin resistance and the AMPK signaling pathway, potentially through interactions with the key targets STAT3, AKT1, NFKB1, HMGCR, MTOR, and ACACA. Both ligand-based (Support Vector Machine regression) and structure-based (molecular docking) approaches show promising results regarding the activity of this compound. Therefore, stigmasterol is predicted as a potential candidate for further development as a natural antidiabetic agent through the multitarget mechanism of action generated from this modeling. However, the pharmacokinetic profile of stigmasterol indicates potential challenges in meeting drug-likeness criteria, which require further experimental validation.
Computational Study of Flavonoid Compounds from Diplazium esculentum as Potential Anti-Acne Agents through Molecular Docking and ADMET Analysis Zannah, Fathul; Fajeriyati, Nurul
Journal of Tropical Life Science Vol. 16 No. 01 (2026)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.16.01.15

Abstract

Acne vulgaris is a common skin disorder influenced by multiple biological factors, including hormonal regulation, microbial activity, and inflammatory processes. The overactivation of androgen-regulated pathways contributes to excessive sebum production, which plays a central role in acne development. Although synthetic anti-acne drugs are widely used, their prolonged application may cause adverse effects, prompting growing interest in natural compounds as alternative therapeutic candidates. Diplazium esculentum, a medicinal fern traditionally used in Indonesia, has been reported to possess antibacterial activity; however, its molecular potential as an anti-acne agent remains insufficiently explored. This study aims to computationally investigate flavonoid compounds derived from Diplazium esculentum as potential anti-acne agents by evaluating their molecular interactions and pharmacokinetic properties. The research focuses on a molecular docking approach combined with pharmacokinetic and toxicity prediction to provide preliminary insights at the molecular level. Flavonoid compounds identified from liquid chromatography–mass spectrometry profiling, including apigenin, genistein, daidzein, and naringenin, were selected as ligands for computational analysis. Molecular docking simulations were performed to predict the interaction between these compounds and the androgen receptor, a key molecular target associated with hormone-regulated sebum production. In addition, pharmacokinetic and toxicity properties were evaluated using in silico absorption, distribution, metabolism, excretion, and toxicity prediction tools to assess drug-likeness and safety profiles. The results demonstrated that all evaluated flavonoids exhibited favorable binding interactions within the ligand-binding domain of the androgen receptor, with interaction patterns comparable to those of a reference compound. Pharmacokinetic predictions indicated acceptable absorption characteristics and low toxicity risk for the selected flavonoids. In conclusion, this computational study highlights the potential of flavonoid compounds from D. esculentum as promising natural candidates for anti-acne applications. The findings support the use of molecular docking and pharmacokinetic prediction as effective preliminary approaches for exploring drug potential and provide a scientific basis for further experimental validation.
Ferula assafoetida as a Multi-Target Therapeutic Candidate for Parkinson's Disease: A Narrative Review Selvaraju, Anusia; Mahat, Naji Arafat; Jemon, Khairunadwa; Mohd Nasir, Mohd Hamzah; Abdul Hamid, Azzmer Azzar; Mohamed Huri, Mohamad Afiq
Journal of Tropical Life Science Vol. 16 No. 2 (2026)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.16.02.01

Abstract

Parkinson’s disease (PD) presents a complex challenge in neurodegenerative research due to the persistent lack of disease-modifying therapies, prompting exploration of natural compounds with multi-target capabilities to modulate multiple pathways. Hence, this review evaluates the therapeutic potential of the ayurvedic plant, Ferula assafoetida, as a candidate for PD treatment. The phytochemical profile of F. assafoetida, rich in bioactive sulfur volatiles, phenolic acids, coumarins, and terpenes, aligns with mechanisms implicated in PD pathogenesis, including oxidative stress, inflammation, and mitochondrial dysfunction. Critically, recent activity-guided isolation studies have successfully identified specific sesquiterpene coumarins, such as karatavicinol and farnesiferol C, as potent monoamine oxidase-B (MAO-B) inhibitors, demonstrating efficacy in ameliorating motor deficits and protecting dopaminergic neurons in a murine 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) model of PD. This breakthrough provides the first direct experimental evidence for F. assafoetida in a PD model, transitioning its status from a traditional remedy to a source of validated, bioactive lead compounds. While mammalian models offer crucial translational validation, zebrafish, with their conserved dopaminergic pathways, genetic tractability, and suitability for high-throughput screening, emerge as an ideal complementary platform for accelerating future research. Advanced phytochemical profiling, integrating chromatographic methods and in silico molecular docking, could prioritize lead compounds for further investigation. The integration of gene expression analysis in zebrafish models, alongside behavioral assays, enables a comprehensive understanding of the impact of this plant on PD-related pathways. This pertinent evidence now positions F. assafoetida as a viable preclinical candidate. Future research should prioritize chemical standardization across different plant sources and in vivo mechanistic studies in zebrafish. By illustrating the synergy between phytochemistry and innovative model systems, this review lays the groundwork for exploring F. assafoetida as a promising candidate for novel PD therapies and related neurodegenerative disorders.
Structure of Mangrove and Associated Macrobenthos Communities Linked to Bioturbation Activities (Case Study: Northern Coast of East Java, Indonesia) Firdausi, Muhammad Azka Dzikri; Andristi, Adinda Martha Putri; Danendra, Hafiz Arya; Sari, Syarifah Hikmah Julinda; Saputra, Dhira Khurniawan; Yona, Defri
Journal of Tropical Life Science Vol. 16 No. 2 (2026)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.16.02.03

Abstract

Mangrove ecosystems and their associated macrobenthos interact closely through bioturbation, a key process that regulates sediment reworking, oxygen exchange, and nutrient cycling. This study examined how variations in mangrove and macrobenthos community structure relate to bioturbation among the studied mangrove ecosystems. Sampling was conducted across four mangrove ecosystems along the northern coast of East Java. A total of six mangrove species were recorded, dominated by Rhizophoraceae, along with 40 associated macrobenthos species dominated by Gastropoda and Malacostraca. Mangrove stand density ranged from 633.3 to 1300 ind/ha and did not differ significantly among sites, indicating relatively stable vegetation structure despite low diversity. Conversely, macrobenthos density varied significantly across sites, ranging from 7.44 to 26.56 ind/m². The macrobenthos community showed moderate diversity but generally reflected stable ecological conditions. Burrowing hole density differed significantly among sites, ranging from 34.11 to 70.44 holes/m², indicating spatial variation in potential bioturbation intensity. Correlation analysis revealed that Malacostraca abundance had the strongest relationship with burrow density, indicating a moderate positive association and highlighting the potential role of Malacostraca as the main contributors to bioturbation processes in mangrove ecosystems. Overall, this finding indicates that bioturbation potential does not depend on a single factor but rather arises from the interplay among vegetation structure, macrobenthos community composition, and environmental conditions. Maintaining habitat and ecosystem conditions is essential for supporting functionally important macrobenthos groups and sustaining sediment-related ecosystem processes. Conservation and restoration efforts should therefore consider both vegetation structure and associated faunal communities.

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