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I Made Merdana
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Advances in Tropical Biodiversity and Environmental Sciences
Published by Universitas Udayana
ISSN : 25496980     EISSN : 26220628     DOI : https://doi.org/10.24843/ATBES.2023.v07.i02.p01
Core Subject : Health, Science, Education, Agriculture, Social, Engineering,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Environmental Science Immunology & microbiology Medicine & Pharmacology Veterinary Other
The scope of the journal covers scientific and technological aspects from all fields that have general relevance to tropical biodiversity and environmental sciences, including investigations on tropical biodiversity, systematics and taxonomy, terrestrial and aquatic ecology, wildlife management and control, ethnobotany and ethnozoology, tropical plant and animal cultivation, general veterinary, natural product chemistry, ecotourism, environmental remediation and management, and geographic information systems (GIS), remote sensing, and other modeling applications for environmental studies.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 73 Documents
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Identification of Microplastics in Three Fish Species in Tondano Lake, Minahasa, Indonesia Fernando Andre Watung; Alva Sahiri Alexander Supit; Merry Triastuti Gosal
Advances in Tropical Biodiversity and Environmental Sciences Vol. 9 No. 2 (2025): June 2025
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2025.v09.i02.p04

Abstract

Microplastic pollution is a significant threat to aquatic ecosystems and human health, particularly in Indonesia, a major contributor to plastic waste. This study investigated the presence and characteristics of microplastics in three commonly consumed fish species from Tondano Lake, North Sulawesi: mujair (Oreochromis mossambicus), payangka baru (Oxyeleotris marmorata), and payangka lama (Ophiocara poropechala). Analysis of gills and gastrointestinal tracts (GIT) from 11 fish samples revealed microplastic contamination in all species. Mujair exhibited the highest microplastic abundance, predominantly fragments in both gills and GIT. Payangka baru showed more fibers in the GIT and fragments in the gills, while payangka lama had more fibers in the GIT and fragments in the gills. A positive correlation was observed between fish body weight and microplastic accumulation in the GIT, but not the gills. The findings confirm microplastic contamination in Tondano Lake fish, highlighting the need for stricter waste management and further research on human health implications.
Effectiveness Test of Immobilization of Aspergillus niger Fungi with Different Biomass on Hexavalent Chromium (Cr VI) in Water Anisa Fitriawati; Ima Yudha Perwira; Devi Ulinuha
Advances in Tropical Biodiversity and Environmental Sciences Vol. 9 No. 3 (2025): October 2025
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2025.v09.i03.p07

Abstract

Heavy metal contamination with Cr(VI) in aquatic environments is a serious concern due to its high toxicity and mobility. This research aimed to evaluate the effectiveness of immobilized Aspergillus niger in sodium alginate with different biomass concentrations (0 g, 0.1 g, 0.3 g, and 0.5 g) in reducing Cr(VI) content in water. The research was conducted from March to May 2025 using a quantitative experimental method with a Completely Randomized Design (RAL), consisting of four treatments and three replications. The bioremediation process lasted 5 days, and Cr(VI) concentration was measured using a UV-Vis spectrophotometer at 540 nm, with the data analyzed in Microsoft Excel. The results indicated that each biomass treatment exhibited varying levels of Cr(VI) removal. The treatments T3, T1, T2, and T0 (control) showed the highest to lowest effectiveness, with values of 39.4%, 32.4%, 30.7%, and 28.0%, respectively. The rate of Cr(VI) reduction increased with increasing fungal biomass, but not in a straight line across all treatments. The metal removal process occurred through biosorption and bioaccumulation mechanisms, influenced by factors such as initial metal concentration, particle size, and the availability of functional groups on the fungal cell wall and alginate matrix. This study demonstrates that immobilized Aspergillus niger can reduce Cr(VI) content in water, although its effectiveness is not yet optimal.
Exopolysaccharides-Producing Lactic Acid Bacteria in Marinated Pakoba (Syzygium luzonense Merr.) Fruit Revanda Stevanie Hasani; Helen Joan Lawalata; Anita Constanci Christine Tengker; Marthy Stella Taulu; Fernando Andre Watung
Advances in Tropical Biodiversity and Environmental Sciences Vol. 9 No. 3 (2025): October 2025
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2025.v09.i03.p06

Abstract

Pakoba fruit is one of the endemic flora of North Sulawesi which is rich in nutrients and has the potential to be fermented. The fermentation process occurs due to the bacteria in the fruit, including lactic acid bacteria (LAB). One of the interesting products from LAB fermentation is that it can produce secondary metabolites which have the potential to produce exopolysaccharides, namely high molecular weight and biodegradable polymers. This research aims to determine whether LAB can be obtained from fermentation of Pakoba marination and what types of LAB produce exopolysaccharides based on their phenotypic characteristics. This research uses a qualitative descriptive method to characterize the type of LAB and observe the exopolysaccharides produced by the bacteria. This research succeeded in isolating and identifying 10 LAB isolates based on their morphological and biochemical characters. Four isolates named MP(1)5.2, MP(1)7.1, MP(3)6.3, MP(3)7.2 can produce exopolysaccharides with a soft character but not mucus, where bacterial exopolysaccharides are believed to increase probiotics in the digestive tract. Genus level recognition (generic assignment) based on profile matching revealed that these four bacteria were from the genus Lactobacillus.

Page 8 of 8 | Total Record : 73

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