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RISS 인기검색어
- 검색키워드
- 저자 : Nurjannah Nurdin (검색결과 4 건)
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Nurjannah Nurdin,Khairul Amri,Supriadi Mashoreng,Teruhisa Komatsu 한국해양과학기술원 2022 Ocean science journal Vol.57 No.1
As one of the major blue carbon ecosystems, studying, conserving, and monitoring seagrass meadows, especially on small populated islands, has become very important due to their vulnerability to anthropogenic and global environmental factors. In this study, we used satellite image analysis and biological data to map seagrass percent cover (SPC), above-ground biomass (AGB), and below-ground biomass (BGB) on the three most populated islands of the Spermonde Archipelago, Indonesia, i.e., Kodingareng Lompo, Barrang Lompo, and Barrang Caddi. Reflectance and Normalized Difference Vegetation Index (NDVI) values of Sentinel-2 (S2) imagery were used to classify and calculate SPC and AGB. In situ biological data measurements were carried out from 3 to 14 of June, 2020, on the three islands to measure AGB and BGB. The result from image classification shows a total area of 126.37 Ha of seagrass, which was divided into three SPC categories: medium (30–59.9%) with a total area of 78.38 Ha; low (0–29.9%) with a total area of 13.1 Ha; and high (60–100%) with a total area of 34.89 Ha. The highest SPC area was observed on Kodingareng Lompo Island with 61.07Ha, followed by Barrang Lompo Island with 53.18Ha, and Barrangcaddi Island with 12.12Ha. The total AGB on Barrang Lompo, Kodingareng Lompo, and Barrangcaddi in tons of dry weight/ha were 1.83, 1.05, and 2.38, respectively. The highest BGB was reported on Barrangcaddi Island with 8.61 tons of dry weight/ha, followed by Barrang Lompo Island with 6.78 tons of dry weight/ha, and Kodingareng Lompo Island with 2.78 tons of dry weight/ha. Regression analysis showed a linear correlation between NDVI value and in situ SPC with R2 = 0.8255. The framework of this study can be applied to monitor temporal changes of seagrass meadows distribution on small islands to promote a more sustainable ecosystem.
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Nurjannah Nurdin,Teruhisa Komatsu,Agus,M. Akbar AS,Abdul Rasyid Djalil,Khairul Amri 한국해양과학기술원 2015 Ocean science journal Vol.50 No.2
Coral reefs are important because of their high biodiversity and their key role in the tropical marine biosphere. Furthermore, coral reefs are very valuable as a socioeconomic resource as they make important contributions to the gross domestic product of many countries. Thus, it is very important to monitor dynamic spatial distributions of coral reefs and related habitats dominated by coral rubble, dead coral, and bleached corals. Despite these natural and socio-economic advantages, many factors are threatening coral reefs. The study site was selected in Spermonde archipelago, South Sulawesi, Indonesia because this area is included in the Coral Triangle, recognized as the epicenter of coral diversity and a priority for conservation. Images of Landsat MSS, Landsat TM, Landsat ETM, Landsat ETM+, and Landsat 8 data were used to examine changes in the coral reefs of Suranti Island in the Spermonde Archipelago during forty one years from 1972 to 2013. The image processing includes gap fills, atmospheric corrections, geometric corrections, image composites, water column corrections, unsupervised classifications, and reclassifications. Fill Gap processing was done on Landsat ETM+ SLC-off. Subsequently, a multi-component change detection procedure was applied to define changes. Shallow water bottom types classification was divided into live coral, rubble and sand habitats, dead coral with algae, rubble, and sand. Preliminary results showed significant changes during the period 1972-2013 as well as changes in coral reefs, likely explained partly by destructive fishing practices.
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Shuhei Sawayama,Nurjannah Nurdin,Muhammad Akbar AS,Shingo X Sakamoto,Teruhisa Komatsu 한국해양과학기술원 2015 Ocean science journal Vol.50 No.2
Coral reef ecosystems worldwide are now being harmed by various stresses accompanying the degradation of fish habitats and thus knowledge of fish-habitat relationships is urgently required. Because conventional research methods were not practical for this purpose due to the lack of a geospatial perspective, we attempted to develop a research method integrating visual fish observation with a seabed habitat map and to expand knowledge to a two-dimensional scale. WorldView-2 satellite imagery of Spermonde Archipelago, Indonesia obtained in September 2012 was analyzed and classified into four typical substrates: live coral, dead coral, seagrass and sand. Overall classification accuracy of this map was 81.3% and considered precise enough for subsequent analyses. Three sub-areas (CC: continuous coral reef, BC: boundary of coral reef and FC: few live coral zone) around reef slopes were extracted from the map. Visual transect surveys for several fish species were conducted within each sub-area in June 2013. As a result, Mean density (Ind. / 300 m2) of Chaetodon octofasciatus, known as an obligate feeder of corals, was significantly higher at BC than at the others (p < 0.05), implying that this species’ density is strongly influenced by spatial configuration of its habitat, like the “edge effect.” This indicates that future conservation procedures for coral reef fishes should consider not only coral cover but also its spatial configuration. The present study also indicates that the introduction of a geospatial perspective derived from remote sensing has great potential to progress conventional ecological studies on coral reef fishes.
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Sri Suro Adhawati,Nurjannah Nurdin,Hasni Yulianti Azis,Badraeni Rustam,Muhammad Akbar,Agus Aris The Korean Society of Fisheries and Aquatic Scienc 2024 Fisheries and Aquatic Sciences Vol.27 No.1
The aim of this study was to analyze the income and productivity of seaweed farmers based on farmed land ownership status. This research was conducted in three provinces on the Sulawesi Island which are ranked among the 10 largest seaweed producers in Indonesia: Central Sulawesi, South Sulawesi and Southeast Sulawesi. The twelve study sites were determined based on 5 special criteria and 792 respondents fulfilled the criteria for seaweed farmers. Data were collected through field surveys and analyzed using qualitative and quantitative methods. Results showed that the seaweed farming areas are considered as private property with 4 types of marine land tenure or ownership status: own land, inherited land, leasehold land and purchased land. The productivity of seaweed farming land had a positive value greater than 1 in South Sulawesi and Southeast Sulawesi, and a positive value of less than 1 in Central Sulawesi. Seaweed cultivation in Central Sulawesi has not been managed effectively. At all sites, the maximum number of growing season cycles was 5 cycles/year. Optimal growing season conditions gave the highest marginal returns at 2-3 cycles/year with additional costs exceeding additional income for more than 3 cycles/year.
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