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All Journal Jurnal Entomologi Indonesia International Journal of Hydrological and Environmental for Sustainability
Pulungan, Zumaida Nur
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Environmental Science

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Tropical lowland rainforest conversion to rubber monoculture affects flight activity and pollen resources of the stingless bees Tetragonula laeviceps: Konversi hutan tropis dataran rendah menjadi lahan monokultur karet mempengaruhi aktivitas terbang dan asupan sumber daya lebah tanpa sengat Tetragonula laeviceps Pulungan, Zumaida Nur; Priawandiputra, Windra; Grass, Ingo; Li, Kevin; Robo, Rusnia J; Raffiudin, Rika
Jurnal Entomologi Indonesia Vol 20 No 1 (2023): March
Publisher : Perhimpunan Entomologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5994/jei.20.1.88

Abstract

Tropical lowland rainforest conversion leads to decreases diversity and population in insect pollinators, including stingless bees. However, how stingless bees respond to this conversion is still being studied. In this study we observed the number of flight activities of the Tetragonula laeviceps (Smith) in three converted land types in Jambi, Sumatra; identified the pollen resources of T. laeviceps from the collected pollen in the hind tibia; and exploring the flowering plants surrounding the T. laeviceps nests. Four flight activities were observed, i.e., flying out of the nest, returning with pollen, returning without pollen, and returning with resin. In addition to the flight activity, we observed flight direction and environmental factors and identified pollen composition from the hind tibia of stingless bees. This study showed that forest fragments had the highest number of bees flying out of the nest. Bees returning with or without pollen in the fragmented forest with high coverage were higher than in other habitats. The highest number of bees returning with resin was found in the rubber plantation with high coverage, while the lowest number of all flight activities were observed in the shrub with low coverage. The stingless bees mainly collected pollen from rubber flowers supported by their flight directions leading to blooming rubber trees. Our study showed that the conversion of tropical lowland rainforests in this case rubber plantation affects on decreasing the flight activities and pollen collecting of stingless bees, which may have a significant impact on the resources needed by the bees.
Analysis of Subsurface Faults Using 3D Gravity Method Based On Satellite Image Data: Insights into Indo-Australian and Eurasian Plate Subduction in the Formation of An Accretionary Prism Dewi, Kadek Ciptani Satria; Siregar, Rahmat Nawi; Ningati, Trisna Ikhsan; Pulungan, Zumaida Nur; Indriyawati, Agapetalia; Takahashi, Hirotaka
International Journal of Hydrological and Environmental for Sustainability Vol. 4 No. 3 (2025): International Journal of Hydrological and Environmental for Sustainability
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v4i3.960

Abstract

This geophysical study employs the gravity method to analyze subsurface fault structures in the Simeulue Island region. The area lies within an active tectonic zone where the Indo-Australian Plate subducts beneath the Eurasian Plate, making it a critical site for understanding subduction dynamics and accretionary prism formation. Secondary gravity and topographic data were acquired from TOPEX satellite imagery. The primary objective is to identify gravity anomalies and delineate subsurface geological features such as faults, folds, and fractures based on variations in the Earth's gravitational field caused by density contrasts between rock units. The gravity method is particularly effective due to its sensitivity to such density differences. Qualitative interpretation was conducted using Surfer 16, while quantitative modeling utilized Oasis Montaj. Results reveal high Bouguer anomaly values in the southwest, corresponding to the plate convergence zone, and low anomaly values extending from the southeast to northwest, associated with the accretionary prism. The 2D model illustrates the subduction of oceanic crust with a density of 3.43 g/cm³ beneath continental crust with a density of 2.67 g/cm³. The 3D model further reveals that subduction becomes evident at a depth of approximately 16.11 km, with the crustal thickness in the accretionary prism zone reaching around 19.92 km. The 3D approach provides a more comprehensive spatial visualization of the subduction geometry and density distribution, offering insights that surpass conventional 2D analysis. These findings contribute to a deeper understanding of regional geodynamics and may serve as a reference for seismotectonic studies and disaster mitigation efforts in the surrounding area.
Co-Authors Dewi, Kadek Ciptani Satria Grass, Ingo Indriyawati, Agapetalia Li, Kevin Ningati, Trisna Ikhsan RIKA RAFFIUDIN Robo, Rusnia J Siregar, Rahmat Nawi Takahashi, Hirotaka WINDRA PRIAWANDIPUTRA, WINDRA