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STRUKTUR KOMUNITAS IKAN PADA PADANG LAMUN DI PERAIRAN TUKAK KABUPATEN BANGKA SELATAN Tiara Tiara; Andi Gustomi; M Rizza Muftiadi; Wahyu Adi; Jemi Ferizal; Okto Supratman
Akuatik: Jurnal Sumberdaya Perairan Vol 19 No 2 (2025): AKUATIK : Jurnal Sumberdaya Perairan
Publisher : Department of Aquatic Resources Management, Faculty of Agriculture, Fisheries, and Biology, University of Bangka Belitung

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Abstract

Seagrass beds play an important role for various fish species that have high ecological and economic value by providing a place to find food, nurse and grow. This study aims to examine fish species diversity, composition, abundance, and dominance, as well as analyze the relationship between seagrass cover and fish abundance in the Tukak Waters, South Bangka Regency. The research was conducted in June 2024 at four predetermined stations. Seagrass data collection was carried out using the quadrat transect method to determine the percentage of cover, while fish data were collected using the swept area (sweep) method. The results showed that across the four observed stations, a total of 823 fish individuals were identified, comprising 23 species from 18 families, namely Carangidae, Chaetodontidae, Chanidae, Gerreidae, Gobiidae, Hemiramphidae, Labridae, Leoignathidae, Lethrinidae, Lutjanidae, Monachantidae, Mugilidae, Mullidae, Plotosidae, Siganidae, Shpyraenidae, Terapontidae, and Triacanthidae. The species with the highest composition was Leoignathus equula, accounting for 44.59% of the total population with 367 individuals recorded. The recorded fish abundance reached 1499 individuals per hectare, with a moderate level of diversity, relatively high uniformity, and a low dominance index. Furthermore, this study indicates that fish abundance is correlated with the percentage of seagrass cover, where a higher seagrass cover percentage corresponds to a higher fish abundance in the area.
Estimasi Stok Karbon Atas dan Serapan Karbon Dioksida pada Tegakan Mangrove Taman Nasional Gunung Maras Kabupaten Bangka Sheva, Sheva; Farhaby, Arthur Muhammad; Gustomi, Andi
Jurnal Laut Khatulistiwa Vol. 9 No. 3 (2026): October
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v9i3.112058

Abstract

Gunung Maras National Park, Bangka Regency, has mangrove stands with considerable potential for carbon storage. However, information on mangrove density, aboveground biomass, carbon stock, and carbon dioxide sequestration in Mengkubung Hamlet is still limited. This study aimed to analyze mangrove density, estimate aboveground biomass and carbon stock, and determine carbon dioxide sequestration by species. The study used a descriptive quantitative method, with sampling locations selected using purposive sampling at three stations, each consisting of three plots. Stem diameter was measured at 1.3 m above the ground, and biomass was calculated using species-specific allometric equations. Carbon stock was calculated using a carbon fraction of 47% of dry biomass, while carbon dioxide sequestration was calculated using a conversion factor of 3.67. The results showed that total mangrove density was 1,365 ind/ha at Station 1, 3,098 ind/ha at Station II, and 3,510 ind/ha at Station 3. Total aboveground biomass was 402.59 ton/ha, with the highest value at Station 2, at 229.38 ton/ha. Total aboveground carbon stock was 189.22 ton C/ha, while carbon dioxide sequestration was 694.42 ton CO₂/ha. Rhizophora stylosa had the highest values among the mangrove species studied. These results indicate that mangroves in Gunung Maras National Park have substantial carbon storage potential and therefore require protection and rehabilitation, particularly in areas experiencing human pressures.