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All Journal Jurnal Biologi Tropis
Pratama, Made Dendy
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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Gastropod Community Structure as a Bioindicator of Water Quality n The Seagrass Ecosystem at Samuh Beach, Bali Pratama, Made Dendy; I Putu Gede Eka Handrayana Putra; I Kade Alfian Kusuma Wirayuda
Jurnal Biologi Tropis Vol. 25 No. 3 (2025): Juli-September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i3.9574

Abstract

Coastal ecosystems, such as the seagrass meadows at Samuh Beach, Bali, are vulnerable to anthropogenic pressures from high-intensity tourism. This degradation necessitates effective monitoring tools, and gastropod communities are potential bioindicators due to their sensitivity to environmental change. The objective of this study was to evaluate the gastropod community structure as a bioindicator of water quality within this ecosystem. The study was conducted from November to December 2024 at two stations representing different levels of human activity, using line transects and quadrat sampling. A total of 10 gastropod species were recorded. The community structure was characterized by low species diversity (H' = 1.25), moderate evenness (E = 0.52), and low dominance (C = 0.35). In contrast, all measured water quality parameters were found to be within optimal ranges for marine biota. The dissonance between the low biodiversity and favorable water chemistry suggests that the gastropod community is responding to unmeasured stressors, likely physical disturbances or specific pollutants associated with tourism. This study validates the efficacy of using gastropod assemblages as sensitive bioindicators of ecosystem health, capable of detecting impacts that standard water quality tests may miss. Continuous monitoring is recommended to safeguard the area.
Macroinvertebrates as Bioindicators of Water Quality in Karang Beach, Bali Putra, Gede Bayu Hendra Adi; Radithya, Rafi; Dewi, Putu Anggi Handaresta; Aprilia, Revalina; Pratama, Made Dendy
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): in Progress
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12825

Abstract

Karang Beach is a shallow water with a sandy substrate mixed with coral fragments and seagrass beds that support the life of benthic organisms. This study aims to determine the water quality at Karang Beach using macroinvertebrates as bioindicators. Sampling was conducted on November 1 and 25, 2025, using field survey methods (in situ) and laboratory analysis (ex situ). Water quality parameters measured included temperature, pH, turbidity, and current velocity. The measurement results showed relatively stable water conditions with an average temperature of 25.5°C, pH 8.1, and turbidity ranging from 3.3–4.8 NTU. The macroinvertebrates found came from the families Toxopneustidae, Grapsidae, and Holothuriidae. Analysis using the Family Biotic Index (FBI) at stations 1 to 4 showed that the water quality at Karang Beach was in a moderately stressed to poor condition, characterized by the dominance of organisms tolerant to environmental disturbances.
Co-Authors Aprilia, Revalina Dewi, Putu Anggi Handaresta I Kade Alfian Kusuma Wirayuda I Putu Gede Eka Handrayana Putra Putra, Gede Bayu Hendra Adi Radithya, Rafi