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All Journal Bioma : Jurnal Biologi Indonesia
Reza Dino Mahardika
Universitas Negeri Jakarta
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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Organ-specific accumulation of microplastics in Holothuria atra Jaeger, 1833 (Holothuriidae) from Kepulauan Seribu, Indonesia Hanum Isfaeni; Reza Dino Mahardika; Samuel Darell Tohonan Sihite; Muhammad Naufal Al Ghazali; Keenan Garcianov Lasamahu; Ardestia Dwi Alindra Syahrial; Siti Muthi’ah Fairuz Saniyyah; Unaisah Syahidah; Riyani Yahya; Ahmad Dwi Susilo
Bioma Vol. 22 No. 1 (2026): Bioma
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/bioma.v22i1.66450

Abstract

Microplastics represent a major threat to tropical marine ecosystems in Indonesia. This study investigated the spatial and organ-specific accumulation of microplastics in Holothuria atra collected from Pulau Tidung Kecil and Pari, Kepulauan Seribu. A total of 28 individuals were analyzed by separating the tentacles, skin, and digestive tract, followed by hydrogen peroxide degradation, density separation, stereomicroscopy, and polymer identification using Fourier Transform Infrared (FTIR) spectroscopy. Statistical analysis was performed with a Gamma Generalised Linear Model (GLM) and Tukey post hoc tests at α = 0.05. Microplastics were detected in all examined organs at both sampling locations. Three microplastic types were identified—fragments, fibres, and pellets—with fragments being the most abundant. The highest microplastic concentration occurred in the digestive tract, particularly in specimens from Pulau Tidung Kecil. GLM analysis showed that island location, body part, and microplastic type significantly influenced microplastic abundance (p < 0.05). FTIR analysis revealed the predominance of polyethylene (PE) and polypropylene (PP), suggesting contamination sources linked to domestic waste and fishing activities. These findings highlight the susceptibility of Holothuria atra to microplastic exposure and suggest its potential utility in monitoring microplastic pollution in tropical coastal ecosystems.
Exploring butterfly diversity in urban landscapes: A case study from Depok, Indonesia Reza Dino Mahardika; Nafidza Nur Shabrina; Syafiq Alan Setyawan; Mohamad Isnin Noer
Bioma Vol. 21 No. 2 (2025): Bioma
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/bioma.v21i2.64032

Abstract

Depok City is one of Jakarta's satellite cities with a high level of urbanisation that is reducing the living space for butterflies. Green open spaces (GOS) play an important ecological role and have the potential to become habitats for a diverse range of butterfly species in urban areas. The existence of GOS has the potential to provide food plants and environmental preferences that support the living space of butterflies. Research needs to be conducted to determine the potential of these GOS as habitats for butterfly diversity in urban areas. This study aims to determine the diversity, abundance, density, and evenness of butterfly species in Depok City's GOS. The study was conducted in five GOS in Depok City using the Visual Encounter Survey (VES) sampling technique. We found Depok’s GOS showed moderate butterfly diversity and species evenness indices with an average density of 10.04 individuals/ha. GOS’s temperature and humidity does not determine the population variables; while light intensity and area sizes significantly related to abundance, Shannon-Wiener’s H’ and density of butterflies. Pielou’s E is not determined by any abiotic variables. Depok’s green spaces show strong promise as refugia supporting butterfly diversity in urban ecosystems.
Co-Authors Ahmad Dwi Susilo Ardestia Dwi Alindra Syahrial Hanum Isfaeni Keenan Garcianov Lasamahu Mohamad Isnin Noer Muhammad Naufal Al Ghazali Nafidza Nur Shabrina Riyani Yahya Samuel Darell Tohonan Sihite Siti Muthi’ah Fairuz Saniyyah Syafiq Alan Setyawan Unaisah Syahidah