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Dwi Anggorowati Rahayu
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Jurnal Riset Biologi dan Aplikasinya
Published by Universitas Negeri Surabaya
ISSN : -     EISSN : 26559927     DOI : 10.26740/jrba
Core Subject : Health, Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science Immunology & microbiology Medicine & Pharmacology
Jurnal Riset Biologi dan Aplikasinya is a peer-reviewed journal that strives to provide scientific information on the research results which focused on biological science (Ecology, Animal and Botanical Systematics, Microbiology, Zoology, Botany, Biotechnology, and Genetics and Evolution) and biological education (Innovation of Biology Learning, Assessment and Evaluation in Biology, and Media of Biology)
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ecology, Evolution, Behavior and Systematics
Articles 4 Documents
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Search results for , issue "vol. 8 no. 2 (2026)" : 4 Documents clear
Community Structure, Diversity, and Regeneration Patterns of Ficus Species in The Manggis Gadungan Nature Reserve, Kediri Aulia Rahma Syita; Siti Nurlaili; Rudianto Rudianto; Kamal E. M. Elkahlout; Fida Rachmadiarti; Endang Susantini; Dyah Hariani; Yuni Sri Rahayu
Jurnal Riset Biologi dan Aplikasinya Vol. 8 No. 2 (2026)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The genus Ficus plays a vital role in tropical forest ecosystems as a keystone species that supports biodiversity and ecosystem stability. This study aims to analyse vegetation structure, species diversity, regeneration patterns, and the influence of environmental factors on Ficus communities in the Manggis Gadungan Nature Reserve, East Java. The study employed a hierarchical plot method across 40 plots (20 × 20 m) with a total area of approximately 1.6 ha. Vegetation data were collected at the seedling, sapling, pole, and tree levels, and analysed using the Importance Value Index (IVI), the Shannon–Wiener index (H’), evenness index (E), Simpson’s dominance index (D). Environmental factors measured included light intensity, air humidity, soil pH, and soil moisture. Results showed 15 Ficus species with a total of 129 individuals. H’ values ranged from 2.1 to 2.8 (moderate to high diversity), with evenness of 0.62–0.81, indicating that individual distribution was not yet even. Dominance patterns varied between strata, with the highest INP at the pole level. Regeneration indicated a bottleneck at the seedling stage (regeneration bottleneck). Environmental factors, particularly light intensity and soil moisture, influenced species distribution. In conclusion, the Ficus community exhibits relatively high diversity, yet its regeneration is not yet stable and is influenced by environmental conditions.
Stability of Microalgae-Bacteria Co-cultures During Storage in a Laboratory Freezer at −20°C: A Case Study of Chlorella vulgaris and an Indigenous Bacterial Consortium Diah Fitriana; Sitoresmi Prabaningtyas; Fauzi Akhbar Anugrah
Jurnal Riset Biologi dan Aplikasinya Vol. 8 No. 2 (2026)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jrba.v8n2.p137-145

Abstract

The development of microalgae-based biofuels through co-culture systems holds great potential; however, the scale-up process is often hindered by issues related to inoculum stability during storage. This study aimed to evaluate the effect of storage duration at -20 °C (for 2, 4, 6, 8, 10, and 12 weeks) on cell size and cell density of Chlorella vulgaris in a monoculture system compared with a co-culture system with an indigenous bacterial consortium (Bacillus paramycoides, Lysinibacillus fusiformis, and Delftia sp.). Optical density was measured using a UV-Vis spectrophotometer at 675 nm, while cell morphology was evaluated through microscopic observation in five fields of view. Statistical analysis using ANOVA revealed a significant decline in cell density over storage time (p < 0.05) throughout the 12 weeks in both systems. This structural preservation is presumed to be mediated by Extracellular Polymeric Substances (EPS) forming microalgae-bacteria flocs (MaB-Flocs) that serve as a protective physical buffer. However, viability assays conducted at week 4 showed no cell proliferation after thawing in either system, accompanied by distinct color degradation pathways. Therefore, storage at -20 °C without cryoprotectants is ineffective as a cryopreservation method and unsuitable for delaying cell density measurements, although co-cultivation effectively stabilizes cell morphology evaluations.
Plant Diversity and Community Structure in the Highland Savanna of Bromo Tengger Semeru National Park Vivi Novianti; Ilma Fitriana; Lailasari Syah Tunjung Putri; Agung Witjoro; Indra Fardhani; I Wayan Sumberartha
Jurnal Riset Biologi dan Aplikasinya Vol. 8 No. 2 (2026)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jrba.v8n2.p120-136

Abstract

Disturbances continually decline savanna plant diversity, yet Indonesian research historically favors forests and lowland tropical savannas (e.g., Baluran and East Nusa Tenggara), leaving montane savannas understudied. Given these dynamic shifts, establishing baseline plant diversity data is imperative. This study specifically aims to evaluate plant diversity, community structure, and their relationship with abiotic parameters in Bromo Tengger Semeru National Park’s disturbed montane-subalpine savanna. Vegetation sampling used 30 plots (10 m x 5 m based on minimum curve area), measuring plant density, cover, abiotic factors, and soil microorganisms (three replications). Diversity was evaluated using the Shannon-Wiener index (H’), and dominance using the Importance Value Index (IVI) and cover percentage. Spearman’s correlation was used to examine the relationship between species richness and environmental factors. Vegetation inventory identified fifteen plant species belonging to nine families, with a diversity index (H’) of 1.81. Pteridium aquilinum heavily dominated the community structure (IVI = 69.44%), followed by Imperata cylindrica (55.08%). The low-to-moderate plant diversity observed in the Bromo savanna is likely driven by the peak dry season and the heavy dominance of invasive species. These data contribute to the ecological baseline database of the national park, providing a crucial reference for future monitoring of vegetation dynamics.
Species Diversity and Community Structure of Crabs(Decapoda: Brachyura) at Jumiang Beach, Pamekasan Regency, Madura Nazirah Purwanto; Dina Intan Eka Astutik; Khansa Farahdilla Irfanindya Putri; Dwi Anggorowati Rahayu; Azman Abdul Rahim
Jurnal Riset Biologi dan Aplikasinya Vol. 8 No. 2 (2026)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jrba.v8n2.p157-166

Abstract

Crabs (Decapoda: Brachyura) play important ecological roles in coastal and intertidal ecosystems; however, information on crab diversity at Jumiang Beach, Pamekasan Regency, Madura, is still unavailable. Increasing tourism and coastal development activities may threaten intertidal habitats and biodiversity. This study aimed to identify crab species and evaluate the community structure of brachyuran crabs at Jumiang Beach based on diversity, evenness, and dominance indices. Sampling was conducted at three stations using direct collection and substrate excavation within 1 × 1 m quadrats along 10 × 10 m line transects. Specimens were preserved in 70% ethanol and identified morphologically using taxonomic references. Community structure was analysed using the Shannon-Wiener diversity index (H’), Pielou’s evenness index (E), and Simpson’s dominance index (D). A total of 286 individuals representing seven species and seven families were recorded, including Tubuca dussumieri, Thalamita spinimana, Nanosesarma batavicum, Macrophthalmus latifrons, Scopimera globosa, Mictyris longicarpus, and Ashtoret lunaris. The community showed moderate diversity (H’ = 1.72), high evenness (E = 0.88), and low dominance (D = 0.20). Scopimera globosa was the most abundant species (28.67%). The presence of Macrophthalmidae and Sesarmidae represents new records for the Madura coastal region. These findings highlight the importance of baseline biodiversity surveys for sustainable coastal management.

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