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All Journal Biodiversitas Journal of Biological Diversity
RATNA KOMALA
Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta. Jl Rawamangun Muka, East Jakarta 13220, Jakarta, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Assess the level of damage to the coral reef ecosystem based on substrate coverage on Bira Island, Kepulauan Seribu, Indonesia RATNA KOMALA; MOHAMMAD ISNIN NOER; MIEKE MIARSYAH; DWI SUNU WIDYARTINI; HANDAYANI HANDAYANI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 3 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250309

Abstract

Abstract. Komala R, Noer MI, Miarsyah M, Widyartini DS, Handayani. 2024. Assess the level of damage to the coral reef ecosystem based on substrate coverage on Bira Island, Kepulauan Seribu, Indonesia. Biodiversitas 25: 971-977. Coral reefs are coastal ecosystems that have an important ecological and economic role. Environmental pressures cause damage to ecosystems and decrease coral biodiversity. This study aims to analyze the level of damage to coral reef ecosystems based on substrate cover and obtain the latest information on coral reef ecosystem resources. The study employs a descriptive method with a survey design, utilizing Underwater Photo Transect (UPT) sampling at various depths along the coastline. The data is analyzed using Coral Point Count with Excel extension (CPCe) for substrate cover percentage and the Shannon-Wienner index for coral diversity. The findings reveal nine categories of basic substrate cover, with living hard corals constituting 32.51%, indicating a fairly damaged state. Coral resources are identified across 53 genera and 15 families, exhibiting medium diversity across stations and depths. The study highlights the need to monitor environmental threats that could further damage coral reefs and decrease diversity. The coral reef ecosystem in Bira Island is in a relatively damaged condition, with a decline in coral biodiversity, indicating an imbalance in the ecosystem. Several recommended steps include implementing coral restoration programs, monitoring coral growth, establishing critical coral habitat protection zones, and conducting conservation efforts.
Community status of giant clam (Tridacnidae) on Bira of Seribu Islands, Indonesia RATNA KOMALA; DIANA VIVANTI SIGIT; EKA PUTRI AZRA
Biodiversitas Journal of Biological Diversity Vol. 26 No. 4 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260438

Abstract

Abstract. Komala R, Sigit DV, Azrai EP. 2025. Community status of giant clam (Tridacnidae) on Bira of Seribu Islands, Indonesia. Biodiversitas 26: 1891-1897. The Tridacnidae family, commonly referred to as giant clams, has a comparatively high ecological and commercial potential but is vulnerable to environmental shifts and human activities. The study aims to identify species of Tridacnidae, ascertain their abundance, diversity, and dominance, and examine the correlation between environmental factors and the population abundance of giant clams on Bira of Seribu Islands, Indonesia. The location of the observation is determined purposefully based on the coral reef existence. Data collection was carried out using the line Transect method, which involves measuring 10 transects over 100 meters from the shore to the reef edge. The Underwater Photo Transect (UPT) sample collection technique was employed at a depth of between 3 and 4.5 meters. The Mantel test was used to examine the relationship between environmental parameters and the abundance of giant clams. In contrast, the abundance, biodiversity, and dominance index formulas were used to interpret the data. The result identified three species of giant clams from the genera Tridacna and Hippopus, with T. maxima showing the highest abundance, followed by T. gigas and H. hippopus. The diversity encompassed the low to middle criteria with low criteria dominance. Environmental parameters remained within a range favorable for the growth of giant clams, but there is no significant correlation between the environmental parameters with the abundance of Tridacnidae.
Co-Authors DIANA VIVANTI SIGIT DWI SUNU WIDYARTINI EKA PUTRI AZRA HANDAYANI HANDAYANI MIEKE MIARSYAH MOHAMMAD ISNIN NOER