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All Journal Biocaster : Jurnal Kajian Biologi
Ratna Sari
Program Studi Agroekoteknologi, Fakultas Pertanian dan Kehutanan, Universitas Sulawesi Barat, Jalan Prof. Dr. Baharuddin Lopa, S.H., Majene, Sulawesi Barat 91412, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology

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Studi Ekologi Komunitas Biotik Menggunakan Metode Relevé pada Berbagai Tipe Habitat di Kabupaten Polewali Mandar Ratna Sari
Biocaster : Jurnal Kajian Biologi Vol. 6 No. 2 (2026): April
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/biocaster.v6i2.845

Abstract

This study aims to analyze the structure and composition of biotic communities in various habitat types in Polewali Mandar Regency, West Sulawesi, using the relevé method. Observations were carried out in five sub-districts, namely Campalagian, Binuang, Tutar, Tapango, and Limboro. At each location, three plot sizes (1×1 m, 3×3 m, and 5×5 m) were set to compare species diversity based on the size of the sampling area. Data is collected by recording the presence of all organisms (plants and animals) present in the plot without counting the number of individuals in detail. The results showed that the number of species increased as the area of the plot increased, with a range of 3-7 species on a 1×1 m plot, 5-15 species on a 3×3 m plot, and 9-26 species on a 5×5 m plot. Several groups of organisms, such as pioneer herbaceous plants, shrubs, and generalist insects (e.g., Formicidae and Lepidoptera) were detected consistently across a wide range of plot sizes and habitats, indicating adaptability and wide distribution. Increased species richness on larger plots reflects the heterogeneity of microhabitats and the greater complexity of trophic interactions, thus supporting the principle of species-area relations in community ecology. This study provides basic data on biodiversity and biotic community structure in Polewali Mandar that can be used as a reference in conservation planning, sustainable natural resource management, and ecological policy development at the regional level.
Analisis Pola Distribusi dan Keanekaragaman Komunitas Biotik di Lima Kecamatan Kabupaten Majene, Sulawesi Barat dengan Metode Relevé Ratna Sari
Biocaster : Jurnal Kajian Biologi Vol. 5 No. 4 (2025): October
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/biocaster.v5i4.780

Abstract

Indonesia is known as one of the mega-biodiversity countries in the world, because it has a very high level of biodiversity, which is influenced by geographical conditions, tropical climate, and the diversity of ecosystems spread across various islands. This study aims to analyze the diversity of flora and fauna communities using the Relevé method in five sub-districts in Majene Regency, West Sulawesi Province, namely Sendana, East Banggae, Banggae, Tammerodo Sendana, and Pamboang Districts. The relevé method was applied with a multi-level approach through three plot sizes, namely 1×1 m², 3×3 m², and 5×5 m² to observe the influence of area area on the number of species found. The results of the observations showed that the increase in the area of the plot was directly proportional to the number of species identified. In plots measuring 1×1 m², the lowest average number of species was found, while in plots measuring 5×5 m², the highest number of species was found. The results of this study show that there is a pattern of positive relationships between area area and species richness which reflects the level of environmental heterogeneity and ecosystem complexity in the research area. The Relevé curve shows an inlinear trend of increasing the number of species with a tendency to reach saturation points on the widest plot, indicating that most species are already represented in that area. These findings confirm that the Relevé method is an effective approach in studying the structure and composition of biotic communities, especially in areas with diverse ecological conditions such as Majene Regency. The results of the research are expected to be the basis for efforts to manage and conserve local biodiversity, as well as provide an overview of the ecological potential in the five sub-districts studied.
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