EVALUATING THE PROVISIONING AND REGULATING SERVICES OF MACROALGAE: BIOACTIVE COMPUND PROFILES, SPECIES COMPOSITION, AND CARBON STOCKS FROM KARAPYAK BEACH, WEST JAVA, INDONESIA
Abstract
Coastal macroalgae play a crucial dual role in marine ecosystems by providing provisioning services through bioactive compounds and regulating services through carbon sequestration. This study aimed to evaluate the species composition, bioactive compound potential, and estimated carbon stock of macroalgae at Karapyak Beach, West Java, Indonesia. Field sampling was conducted using line transects and quadrat plots across mixed intertidal substrates, accompanied by physicochemical water measurements. A total of 10 macroalgal species were identified across three divisions: Chlorophyta (40%), Rhodophyta (30%), and Phaeophyta (30%). Bioactive compounds such as phenolics, flavonoids, carotenoids, and polysaccharides were found to have antioxidant, antibacterial, antifungal, and anti-inflammatory properties based on literature references. The highest carbon stock was recorded in Sargassum polycystum (120.21 g C/m²), followed by Sargassum duplicatum (64.14 g C/m²), making them significant contributors to blue carbon storage. These findings underscore the ecological importance of macroalgae for coastal biodiversity, climate change mitigation, and potential economic applications in biotechnology and carbon credit schemes.
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