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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 1,016 Documents
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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.

Page 102 of 102 | Total Record : 1016

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