19 research outputs found
Study on the Quantitative Evaluation of Performance of Artificial Timber Reefs in Structuring New Habitats for Marine Life
No full text内容の要約博士(学術)Doctor of Philosophy広島大
Study on the Quantitative Evaluation of Performance of Artificial Timber Reefs in Structuring New Habitats for Marine Life
No full textMeasurement of C-Organic Content in Sediment as an Indicator of Carbon Absorption Potential in the Bonto Bahari Mangrove Ecosystem, Maros Regency
No full textMangrove ecosystems play an important role in mitigating global warming through their ability to absorb and store carbon in biomass and sediment. This research analyzes the organic carbon content and carbon sequestration potential in mangrove sediments in Bonto Bahari, Maros Regency, South Sulawesi. Using purposive sampling method, sediment samples were taken from 9 points with 5 different depths (0-50 cm) and analyzed using the Loss on Ignition (LOI) method. The results showed very low bulk density values (0.01-0.02 g/cm³) with the highest value at a depth of 20-30 cm. Carbon concentrations were relatively uniform (1.5-2.0%) at all depths with the highest concentration at a depth of 40-50 cm (1.93%). The highest carbon content was found at a depth of 40-50 cm (100.667 tons/ha) with carbon sequestration reaching 516.958 tons/ha, while the lowest value was at a depth of 0-10 cm (24.60 tons/ha). There were significant differences (p<0.05) in carbon content and sequestration between depths of 0-10 cm and 20-30 cm. This research reveals that deeper sediment layers play an important role in carbon storage in mangrove ecosystems, providing significant implications for sustainable mangrove management and local ecosystem-based climate change mitigation effort
Comparative Analysis of Coral Cover Percentage and Species Diversity in Karanrang Island, Balang Lompo Island, Badi Island, and Lumu-Lumu Island Using the Underwater Photo Transect (UPT) Method
No full textThis study assessed live coral cover and coral genus diversity across Karanrang Island, Balang Lompo Island, Badi Island, and Lumu-Lumu Island. Data collection was conducted at 12 observation stations (depth ±5 m) using the Underwater Photo Transect (UPT) method in April 2025. Photo analysis with CPCe 4.1 software was used to calculate the percentage of live coral cover, while the diversity index was calculated using the Shannon-Wiener formula (H’). The findings revealed that Badi Island exhibited the highest live coral cover (32.31–45.03%), whereas Lumu-Lumu Island demonstrated the lowest condition (10.60–24.97%). The highest diversity index was recorded on Balang Lompo Island (H' = 2.53) and the lowest on Karanrang Island (H' = 0.83). Badi Island is predominantly composed of Porites sp. and Acropora sp., suggesting ecosystem stability and a high potential for regeneration, while Karanrang and Balang Lompo Islands display moderate conditions with a prevalence of adaptive massive corals. These results show variations in coral cover and diversity between islands due to differences in environmental pressures and the ecological characteristics specific. These findings emphasize the need for location-based management to maintain the ecological functions and restoration potential of coral reefs ecosystem in the Spermonde Islands
Modeling the Efficacy of Three Types of Artificial Timber Reefs in Mitsu Bay, Japan
No full textWith the aim of simultaneously improving fishery production and utilizing forestry and oyster fishery wastes, three types of artificial timber reefs (ATRs)—constructed from simple timbers, timbers with oyster shells from local oyster farms, and timbers with leaves/branches from forest thinning—were deployed in Mitsu Bay, Japan. We developed a food web model to investigate the relative efficacies of these ATR types compared with the bare, sandy seafloor. The model described the material flow through the food webs formed in each ATR type and their potential to increase fisheries production. The model outputs were validated with observational data over three years. The model fit the observed biomass of both prey animals and fish predators. The simulation results highlighted that ATRs, particularly those with additional materials, had two to three times higher feeding flow than the sandy seafloor and resulted in increased fish biomass. Fish catch doubled in the ATR areas compared to the bare seafloor. Aside from providing a feeding ground, the complexity of the ATRs with additional materials likely acts to provide shelter for juvenile fish. ATR deployment using by-products such as those mentioned above may not only enhance fish stock but also help foster the establishment of a recycling-oriented society
Estimating Nitrogen and Phosphorus Cycles in a Timber Reef Deployment Area
No full textIn an oligotrophic bay, Mitsu Bay, Japan, artificial timber reefs (ATRs) are deployed to increase fish production. In such man-made ecosystems, the biological activities of other organisms as well as the physical structures of ATRs could influence nutrient cycling. A pelagic–benthic coupling model expressing both phosphorus and nitrogen cycling was developed to investigate seasonal variation in the associated nutrients and their annual budget in the ATR areas and the entire bay system. The model consists of equations representing all the relevant physical and biological processes. The model reproduced the observed seasonal variations in dissolved inorganic P, ammonium, and nitrate concentrations that were low in spring and summer and high in autumn and winter. The internal regeneration rates of the nutrients were two times higher in the ATRs than in the bay area, so that fish production was predicted to be higher in the ATRs than in the bay area. Considering the inflows from the land and precipitation are quite low, nutrient regeneration is an important source of nutrients for the water in Mitsu Bay. ATR deployment could be an important local nutrient source in an oligotrophic bay, and could increase fish production
CARBON ABSORPTION POTENTIAL IN MANGROVE ECOSYSTEM IN BORONGKALUKUA, MAROS REGENCY, SOUTH SULAWESI, INDONESIA
No full textMangrove ecosystems are essential in mitigating climate change through Carbon storage in sediments. This study aims to analyze the bulk density values, carbon concentration, and Carbon storage and absorption in mangrove sediments in Borongkalukua, Maros Regency. Sampling was carried out at five sediment depths (0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm, and 40-50 cm) using the Loss on Ignition (LOI) method and analyzed statistically using one-way and two-way ANOVA. The results showed an average bulk density value of 0.33 g/cm³, with the highest value at a depth of 30-40 cm (0.28 g/cm³). Furthermore, the average Carbon concentration was 11.37%, with the highest value at a depth of 40-50 cm (20.50%) and the lowest at 0-10 cm (1.98%), with no significant differences between depths (p-value > 0.05). Meanwhile, Carbon storage in sediment reached 2,423.77 tons/ha. Total absorption reaching 8,895.23 tons/ha. In conclusion, sediment depth affects carbon accumulation, with higher carbon content in deeper layers due to the sedimentation process and minimal decomposition. This study emphasizes the importance of mangrove conservation in supporting Carbon storage and climate change mitigation
ANALYSIS OF SPECIES COMPOSITION AND DENSITY OF MANGROVES IN BORONG KALUKUA AND BONTO BAHARI, MAROS REGENCY
No full textThis study analyzed the composition and density of mangrove species in Borong Kalukua and Bonto Bahari in Maros Regency. The research method involved a field survey using purposive sampling in several observation plots. The data obtained were analyzed using a quantitative descriptive method to calculate the averages and standard deviations. The results showed that the mangrove density in Borong Kalukua was higher than that in Bonto Bahari, with average densities of 450 and 350 trees/ha, respectively. The standard deviation value showed variations in density between plots, with Borong Kalukua showing more significant variation than Bonto Bahari. Environmental factors and anthropogenic pressures are considered the primary causes of these differences. This study highlights the importance of conservation and rehabilitation efforts in maintaining the balance of mangrove ecosystems, particularly in areas subjected to higher environmental pressures
Pemberdayaan masyarakat melalui inovasi produk ramah lingkungan: studi kasus pengolahan limbah kulit pisang menjadi sabun cuci piring di Desa Massaile, Kecamatan Tellu Limpoe, Kabupaten Sinjai, Sulawesi-Selatan
No full textPemberdayaan masyarakat melalui inovasi produk ramah lingkungan menjadi strategi yang efektif untuk mengatasi tantangan lingkungan dan ekonomi di tingkat komunitas. Penelitian ini menganalisis efektivitas pendekatan tersebut dengan studi kasus pengolahan limbah kulit pisang menjadi sabun cuci piring di Desa Massaile, Kabupaten Sinjai. Permasalahan utama yang menjadi dasar penelitian adalah penumpukan limbah organik yang belum termanfaatkan dan ketergantungan masyarakat pada produk pembersih komersial. Melalui metode partisipatif dalam program Kuliah Kerja Nyata (KKN) yang melibatkan sosialisasi dan pelatihan komprehensif, program ini berhasil meningkatkan pengetahuan serta keterampilan masyarakat dalam mengolah limbah menjadi produk bernilai ekonomi. Hasilnya, tidak hanya tercipta sabun cuci piring yang efektif, tetapi juga tumbuh kesadaran akan pentingnya daur ulang. Kesimpulannya, model pemberdayaan ini terbukti efektif sebagai solusi berkelanjutan yang mengatasi isu lingkungan sekaligus membuka peluang ekonomi baru dan meningkatkan kemandirian masyarakat
Eksplorasi Bakteri Kombucha Sebagai Bahan Material Clutch
No full textIndonesia merupakan salah satu pelaku industri kulit yang cukup terkenal di banyak negara lain. Sumber daya alam yang berlimpah menjadi modal awal dari suksesnya per-industrian kulit. Namun sayangnya dibalik pencapaian-pencapaian bagus industri kulit, polusi yang dihasilkan oleh industri kulit seperti penggunaan bahan kimia dalam jumlah besar, limbah padat, cair dan juga senyawa-senyawa yang tidak bisa terurai membuat masyarakat yang tinggal di sekitar perindustrian kulit mulai merasa terganggu. Imbas buruk limbah per-industrian kulit yang semakin banyak membuat para pelaku industri memutar otak untuk mencari solusi dari permasalahan ini salah satunya dengan mengembangkan bahan lain sebagai alternatif pemasok bahan baku industri kulit seperti kombucha. Dalam produk perancangan kali ini penulis menggunakan bahan material organik dari bakteri kombucha sebagai alternatif material baru. Proses pemakaian lembaran kulit kombucha sebagai bahan baku pembuatan clutch diperlakukan dengan perlakuan yang tepat untuk memaksimalkan nilai dari bakteri Kombucha Scoby sebagai bahan dasar material utama dan mengeksplor karakteristik dari material tersebut dengan memperhatikan kekuatan daya tahan material sebagai alternatif material kulit organik. Dengan memaksimalkan karakteristik dari teh kombucha yang diolah dengan teknik fermentasi tinggi glukosa untuk meningkatkan kekuatan bioplimer lapisan dari gel kombucha untuk dijadikan material kulit organic. Selain itu, elemen material kulit organik dari teh kombucha juga menjadi unsur karakteristik produk yang mendukung gaya produk dan clutch.
Kata Kunci: Industri Kulit, Limbah Industri, Alternative Material, Clutch, Kombucha.
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Indonesia is one of the most reputable manufacturers in the leather industry among many other countries. Having all these natural resources could be the first stairs to climb before entering the success stairs of the leather industry. Unfortunately, despite all the good achievements of the Indonesian leather industry got. There are some ironic facts in the field, the pollution produced by the leather industry such as the use of large amounts of chemicals, solid, liquid waste and also compounds that cannot be decomposed makes people who live around the leather industry start to feel disturbed. The impact of leather industry waste makes the business people rack their brains to find solutions to this problem. One of the solutions is to developing new material as alternative suppliers of raw materials for the leather industry such as Kombucha. In the design product, the author uses organic materials from kombucha bacteria as an alternative to new materials. The process of using kombucha leather sheets as raw material for making clutches is treated with proper treatment to maximize the value of Kombucha Scoby bacteria as the main raw material. Also, in order to explore the characteristics of the material by taking into the strength of the material's durability as an alternative to organic leather. In addition, by maximizing the characteristics of kombucha tea which is processed with a high-glucose fermentation technique to increase the strength of the biopolymer layer of the kombucha gel to be used as an organic leather material. Besides, the organic leather material element of kombucha tea is also a characteristic element of the product that supports the product style and clutch.
Keywords: Leather Industry, Industrial Waste, Alternative Material, Clutch, Kombucha
