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Mangrove gastropod distribution based on dominant vegetation classes and their relationship with physicochemical characteristics on fringe mangroves of Lembongan Island, Bali, Indonesia NI MADE ERNAWATI; AYU PUTU WIWEKA KRISNA DEWI; I PUTU SUGIANA; I WAYAN EKA DHARMAWAN; MIFTACHUDIN SYAIFUL MA'RUF; GEMMA ANTONIA GALGANI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 1 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250116

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Abstract. Ernawati NM, Dewi APWK, Sugiana IP, Dharmawan IWE, Ma’ruf MS, Galgani GA. 2024. Mangrove gastropod distribution based on dominant vegetation classes and their relationship with physicochemical characteristics on fringe mangroves of Lembongan Island, Bali, Indonesia. Biodiversitas 25: 156-166. Mangrove ecosystems are important in supporting diverse marine life, offering refuge, reproductive grounds, and sustenance to various species. However, mangroves possess distinct zoning patterns determined by dominant species due to environmental variations that significantly impact the biodiversity of biota, particularly gastropods. A study on the Indonesian island of Nusa Lembongan revealed distinct communities of coexisting gastropod species in each mangrove vegetation zone. We discovered 29 distinct species of mangrove gastropods, with the Sonneratia mangrove zone having the most and the Lumnitzera zone having the least. Certain species, including Amphidromus perversus, Cerithium adustum, and Echinolittorina sundaica, were detected in only one of the mangrove zones. In each mangrove zone, the composition of gastropod species changed depending on the substrate type, e.g., soil, mangrove trunks, or mangrove leaves. The Shannon-Wiener diversity index values range from low to high diversity, and the community structure index values in mangrove zones vary. The evenness index varied by region, with Avicennia, Bruguiera, and Sonneratia having the highest index value. The findings indicate that mangrove vegetation zones are essential for maintaining diverse gastropod populations, with distinct composition and abundance patterns influenced by the distance of each mangrove zone from the ocean. This data may influence conservation efforts to preserve mangrove habitats and the diverse array of organisms that depend on them.
Ecosystem carbon stock and annual sequestration rate from three genera-dominated mangrove zones in Benoa Bay, Bali, Indonesia I PUTU SUGIANA; TRI PRARTONO; RASTINA RASTINA; ALAN FRENDY KOROPITAN
Biodiversitas Journal of Biological Diversity Vol. 25 No. 1 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250133

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Abstract. Sugiana IP, Prartono T, Rastina, Koropitan AF. 2024. Ecosystem carbon stock and annual sequestration rate from three genera-dominated mangrove zones in Benoa Bay, Bali, Indonesia. Biodiversitas 25: 287-299. The mangrove ecosystem is an ecologically productive wetland system that serves as a carbon sink. However, various factors have contributed to the variation in values when calculating ecosystem carbon stock and the sequestration rate in the mangrove ecosystem. The presence of varying environmental conditions has resulted in the categorizing different species of mangroves, which may lead to variations in ecosystem carbon stock and sequestration rates. In this study, we aim to assess the ecosystem carbon stock and sequestration rate of the mangrove ecosystem in Benoa Bay, Bali, Indonesia. The ecosystem has been categorized into three zones based on the dominant genera: Bruguiera, Rhizophora, and Sonneratia. This research aimed to investigate the influence of mangrove zoning on the variability of carbon stock values and sequestration rates within the ecosystem. The allometric calculation technique and net primary productivity and soil organic carbon percentage values obtained using the Loss on Ignition (LOI) method are used to estimate each zone's ecosystem carbon stock and sequestration rate. The findings of our study indicate that there are notable variations in the carbon stock of ecosystems across different zones. However, we did not observe any substantial changes in the annual carbon sequestration rates. The Sonneratia zone exhibits the maximum value of ecosystem carbon stock and sequestration rate (1,570.9±248.0 tCO2ha-1 and 81.8 tCO2ha-1yr-1), while the Bruguiera zone demonstrates the lowest values (1,029.6±130.9 tCO2ha-1 and 75.6 tCO2ha-1yr-1). The three zones' average carbon stock and sequestration rate are estimated as 338.2 tCha-1 (1239.9 tCO2ha-1) and 21.5 tCha-1yr-1 (78.9 tCO2ha-1yr-1), respectively. In total, the carbon storage and absorption capacity of Benoa Bay amounts to 421,149 tC (equivalent to 1.5 million tCO2), with an annual rate of 25,769.4 tCyr-1 (equivalent to 94,573.6 tCO2yr-1). We recommended that future ecosystem carbon stock evaluations consider mangrove-type zoning characteristics due to significant value fluctuations in various mangrove zones found.
Floristic composition of mangrove community in Ngurah Rai Forest Park and Nusa Lembongan, Bali, Indonesia I MADE SAKA WIJAYA; I PUTU SUGIANA; IDA AYU ASTARINI; I KETUT GINANTRA; KHAIRUL ADHA A. RAHIM
Biodiversitas Journal of Biological Diversity Vol. 25 No. 1 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250134

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Abstract. Wijaya IMS, Sugiana IP, Astarini IA, Ginantra IK, Rahim KAA. 2024. Floristic composition of mangrove community in Ngurah Rai Forest Park and Nusa Lembongan, Bali - Indonesia. Biodiversitas 25: 300-309. The floristic composition of mangroves can be influenced by various factors, one of which is the size of the island. In Bali, Ngurah Rai Forest Park is one of the mangrove areas in the mainland of Bali, while Nusa Lembongan on the southeastern mainland represents the mangrove on the small island. This research aimed to study the floristic composition of the mangrove species in Ngurah Rai Forest Park and Nusa Lembongan based on the species diversity and the structure of mangrove community. Based on the explorative method, both locations have 20 true mangrove species cumulatively, with 18 species in Ngurah Rai Forest Park and 15 species in Nusa Lembongan. The mangrove community structure is majorly composed by Sonneratia alba and Rhizophora (R. apiculata, R. mucronata, and R. stylosa) in trees, saplings, and seedlings. Sonneratia alba has more impact in relative dominance, while the Rhizophora has more impact in relative density. Based on the Shannon-Wiener Index of Diversity, the mangrove community status is Moderate in both locations in all growth forms (trees, saplings, and seedlings). The Index of Dominance and Index of Evenness indicates the mangrove community is in stable condition with no extremely dominated species and fairly even species distribution. The mangrove condition is categorized as Good with Dense Trees based on the Decree of the Minister of Environment number 201 of 2004.
Assessment of soil fraction, carbon storage capacity, and rate of carbon uptake from three coastal ecosystems: Mangroves, seagrass, and mudflats in Benoa Bay, Indonesia I GUSTI NGURAH PUTU DHARMAYASA; I PUTU SUGIANA; PUTU YUDI ADITYA PUTRI; KWANRUETAI BOONYASANA
Biodiversitas Journal of Biological Diversity Vol. 25 No. 6 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250623

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Abstract. Dharmayasa IGNP, Sugiana IP, Putri PYA, Boonyasana K. 2024. Assessment of soil fraction, carbon storage capacity, and rate of carbon uptake from three coastal ecosystems: Mangroves, seagrass, and mudflats in Benoa Bay, Indonesia. Biodiversitas 25: 2541-2549. Coastal habitats, known as blue carbon ecosystems, are highly productive at absorbing and storing carbon. Most carbon is stored as soil organic carbon, and its quantity can vary depending on various factors, including the presence of plants such as mangroves and seagrass, and environmental conditions, including soil fraction. This study quantifies soil carbon stored and its burial rate in three primary coastal ecosystems: mangroves, seagrasses, and mudflats. The ashing method (loss on ignition) is used to quantify carbon content, which is then converted into soil carbon storage and burial rate. Gravimetry and the settling time method are used to determine the soil fraction. We also measure the soil and water properties directly during the sampling time. This study revealed significant soil carbon stock and burial rate variations across different ecosystems. The order of ecosystems with the most extensive carbon stock and burial rate is as follows: mangrove (69-145 tC ha-1 and 1.6-3.4 tCha-1yr-1)>seagrass (63-75 tC ha-1 and 1.5-1.7 tCha-1yr-1)>mudflat (49-61 tC ha-1 and 1.2-1.4 tCha-1yr-1). Mangroves with natural growth have a higher carbon storage capacity than rehabilitated ones. Soil carbon content is highly correlated with the soil and water pH, Dissolved Oxygen (DO), water content, bulk density, and soil type. The findings demonstrate that carbon absorption capability varies among coastal habitats, with vegetated environments exhibiting higher carbon storage levels. Converting land, particularly mudflats, into seagrass beds or mangrove forests may maximize the efficiency of coastal ecosystems as carbon sinks. However, it should be noted that these findings are only estimates, and the precise measurement numbers may differ due to seasonal circumstances or reclamation activities, which might cause oscillations in sedimentation rates. These variations, in turn, could affect the levels of carbon stored and the speed at which it is buried.
Mangrove species distribution across soil texture gradients in Benoa Bay and Nusa Lembongan, Bali Province, Indonesia I GUSTI NGURAH PUTU DHARMAYASA; I PUTU SUGIANA; PONGPIPAT ANANTANASAKUL
Biodiversitas Journal of Biological Diversity Vol. 26 No. 6 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260633

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Abstract. Dharmayasa IGNP, Sugiana IP, Anantanasakul P. 2025. Mangrove species distribution across soil texture gradients in Benoa Bay and Nusa Lembongan, Bali Province, Indonesia. Biodiversitas 26: 2908-2915. This study unveils the crucial role of mangrove ecosystems in enhancing coastal resilience and mitigating climate change through carbon sequestration and shoreline stabilization. This study identifies strong relationships between soil particle composition (sand, silt, clay, and gravel) and the distribution of mangrove species across five genera-dominated zones (Rhizophora, Sonneratia, Avicennia, Bruguiera, and Ceriops) in Bali, Indonesia. By establishing 20 plots at two sites, Benoa Bay and Nusa Lembongan, and quantitatively measuring stand structure (tree and sapling density, diameter, canopy cover, and Mangrove Health Index (MHI) and soil parameters (texture, pH, water content, bulk density, and total organic matter), this study revealed that Ceriops tagal dominates soils with 35-45% silt and clay content; Bruguiera gymnorrhiza thrives in sandy soils exceeding 60% sand; and Sonneratia alba is associated with substrates containing over 20% gravel. Principal component analysis and Pearson correlation reveal significant negative effects of gravel on canopy cover (r: -0.73, p<0.01) and MHI (r: -0.74, p<0.01), and a positive correlation between sand content and sapling density (r: 0.56, p<0.01). These findings not only underscore the critical role of soil texture in mangrove distribution and forest health but also emphasize the need to consider edaphic conditions in restoration and conservation strategies. This knowledge is vital for enhancing ecosystem sustainability and biodiversity.
Ecological diagnosis of Lake Batur (Bali, Indonesia) post-disturbance using multimetric phytoplankton indices SANG AYU MADE PUTRI SURYANI; I GEDE SUDIARTA; NI MADE DARMADI; DEWA GEDE SEMARA EDI; I KETUT SUDIARTA; GEDE AGUS SURYA PRATAMA; I MADE ABDI JANAGUNA; I PUTU SUGIANA
Biodiversitas Journal of Biological Diversity Vol. 26 No. 10 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d261014

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Abstract. Suryani SAMP, Sudiarta IG, Darmadi NM, Edi DGS, Sudiarta IK, Pratama GAS, Janaguna IMA, Sugiana IP. 2025. Ecological diagnosis of Lake Batur (Bali, Indonesia) post-disturbance using multimetric phytoplankton indices. Biodiversitas 26: 4982-4990. Plankton communities are rapid responders to environmental change and serve as sensitive indicators of ecological stress in tropical volcanic lakes. In July 2025, Lake Batur (Bali, Indonesia) experienced a major fish mortality linked to hypolimnetic upwelling and nutrient enrichment from aquaculture. To assess post-disturbance conditions, we sampled three sites with varying aquaculture intensity—Seked (low), Buahan (moderate), and Trunyan (high, mortality epicenter)—one week after the event. Field measurements included temperature, pH, dissolved oxygen, conductivity, redox potential, nutrients, and sulfide, while phytoplankton analysis covered diversity (Shannon–Wiener), evenness (Pielou), dominance (Simpson), and saprobity (Dahuri). Results revealed clear spatial contrasts. Trunyan showed the strongest stress signals, with oxygen depletion, negative redox potential, and elevated ammonia, while Seked and Buahan displayed milder alterations. In total, 23 phytoplankton genera were identified, dominated by diatoms such as Ulnaria and Actinotaenium. Trunyan exhibited reduced richness, lower diversity (H’ = 1.84), and higher dominance (D = 0.27), indicating a shift toward opportunistic taxa. Saprobity values showed a gradient of organic pollution, increasing from Seked (1.5) to Trunyan (2.0), consistent with aquaculture intensity. These findings highlight the value of integrating multimetric plankton indices with physicochemical data to distinguish natural upwelling effects from anthropogenic nutrient loading. While diatom persistence suggests some resilience, recovery of sensitive taxa depends on reducing nutrient inputs and regulating aquaculture. This integrative framework offers a practical diagnostic tool for adaptive lake management and contributes to achieving clean water, climate action, and aquatic biodiversity goals.
Bivalve community structure in relation to soil and porewater properties in Benoa Bay, Bali, Indonesia GEDE SURYA INDRAWAN; I WAYAN ARTHANA; NI MADE SUARTINI; I GEDE HENDRAWAN; I PUTU SUGIANA
Biodiversitas Journal of Biological Diversity Vol. 27 No. 3 (2026)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d270301

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Abstract. Indrawan GS, Arthana IW, Suartini NM, Hendrawan IG, Sugiana IP. 2026. Bivalve community structure in relation to soil and porewater properties in Benoa Bay, Bali, Indonesia. Biodiversitas 27 (3): d270301. https://doi.org/10.13057/biodiv/d270301. Coastal ecosystems support benthic communities that are sensitive to environmental changes, making bivalve community structure a reliable indicator of ecological condition. This study examined relationships between bivalve community structure and soil and porewater properties at seven stations in Benoa Bay, Bali (n: 7 stations). Bivalve sampling used a transect-quadrat approach and recorded 19 species, with spatial variation in richness and density. Soil parameters included total organic matter (TOM, 2.55-4.60%), pH (6.05-6.89), soil fractions (gravel, sand, silt, clay), and water content (0.32-0.59). Porewater properties measured at 30-60 cm depth included temperature (26.1-28.1°C), pH (6.27-7.17), salinity (23.1-28.9 ppt), redox potential (-51 to -98 mV), and dissolved oxygen (1.01-2.63 mg L⁻¹). Data normality was assessed using the Shapiro-Wilk test, followed by Pearson correlation analysis and linear regression. Bivalve density showed a significant positive correlation with sand fraction (r: 0.84, p<0.05) and dissolved oxygen (r: 0.85, p<0.05). Positive but non-significant trends were observed for salinity (r: 0.58, p: 0.172) and oxidation-reduction potential (r: 0.72, p: 0.068), while negative but non-significant relationships occurred with silt (r: -0.65, p: 0.114) and clay fractions (r: -0.73, p: 0.062). Community structure varied spatially, with Shannon diversity index values ranging from 0.58 to 1.80, indicating conditions from relatively balanced to stressed assemblages. Given the limited number of stations, these correlations should be interpreted as exploratory rather than definitive. These results indicate statistically significant associations between bivalve density and selected environmental variables. The findings suggest that bivalve community metrics, combined with soil and porewater measurements, may help describe spatial variation in estuarine ecosystem condition.
Integrated multimetric assessment of mangrove-seagrass-plankton systems across spatial gradients in Banyuwedang Bay, Bali, Indonesia I PUTU SUGIANA; I MADE ABDI JANAGUNA; SAMUDRA ALFATIHA; I MADE SAKA WIJAYA; I GEDE ADHITIYA YASA; I WAYAN GDE SUTASOMA
Biodiversitas Journal of Biological Diversity Vol. 27 No. 4 (2026)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d270416

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Abstract. Sugiana IP, Janaguna IMA, Alfatiha S, Wijaya IMS, Yasa IGA, Sutasoma IWG. 2026. Integrated multimetric assessment of mangrove-seagrass-plankton systems across spatial gradients in Banyuwedang Bay, Bali, Indonesia. Biodiversitas 27 (4): d270416. https://doi.org/10.13057/biodiv/d270416. North Bali coastal waters host interconnected mangrove-seagrass-plankton systems that respond to spatial gradients in physicochemical conditions. This study provides a multimetric baseline assessment integrating environmental parameters with mangrove, seagrass, and plankton indicators across three stations (S1-S3) in Banyuwedang Bay (November 2025), emphasizing spatial ecological patterns rather than inferential relationships. The analysis integrates environmental parameters with ecological indicators of mangroves (Mangrove Health Index, MHI), seagrass (Seagrass Ecological Quality Index, SEQI), and plankton communities (diversity H’, evenness J, and dominance C). Environmental conditions varied spatially, with higher suspended solids at the inner bay and increasing temperature, salinity, and conductivity toward the outer bay. Mangrove ecosystems were consistently classified as excellent (MHI: 67.45-75.98), indicating structurally stable stands despite differences in species composition. In contrast, seagrass meadows exhibited moderate ecological condition (SEQI: 0.63-0.67), reflecting variation between species richness at the inner station and higher coverage at the mid-bay station. Plankton communities showed moderate diversity (phytoplankton H’: 1.31-1.75; zooplankton H’: 0.83-1.80) with localized dominance at the mid-bay station, indicating spatial heterogeneity in community structure. Diatoms dominated across stations, while cyanobacteria increased at one location, suggesting spatial variability associated with environmental gradients. Zooplankton communities displayed relatively high evenness across stations. Overall, the integrated multimetric approach reveals that coastal ecosystems in Banyuwedang Bay remain functionally intact but exhibit clear spatial heterogeneity along the inner-outer gradient. This study provides an integrated baseline framework linking benthic and pelagic indicators for future monitoring and adaptive coastal management in relatively low-disturbance tropical bays.
Evaluasi Tingkat Keberhasilan Penanaman Mangrove Metode Konvensional: Studi Kasus Semai Rhizophora mucronata di Pulau Serangan, Bali I Putu Sugiana; Martobi Ndolu; Rahmat Suhada Lawang; Samudra Alfatiha; Noventius Manek; Dionisius Prawira Hidayat; I Wayan Suarjaya; Ni Kadek Noni Purnama Dewi
Journal of Marine Research Vol 15, No 3 (2026): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v15i3.55217

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Rehabilitasi mangrove merupakan salah satu strategi penting dalam pemulihan ekosistem pesisir yang mengalami degradasi. Namun, keberhasilan kegiatan rehabilitasi sangat dipengaruhi oleh kesesuaian metode penanaman dengan kondisi lingkungan setempat. Penelitian ini bertujuan mengevaluasi tingkat keberhasilan penanaman mangrove menggunakan metode konvensional melalui analisis pertumbuhan dan kelangsungan hidup semai Rhizophora mucronata di Pulau Serangan, Bali. Penelitian dilakukan selama 12 bulan, mulai Juni 2024 hingga Mei 2025, dengan memantau 300 semai yang ditanam secara langsung pada substrat. Pengamatan dilakukan setiap bulan melalui pengukuran tinggi semai, pencatatan jumlah individu yang bertahan hidup, serta observasi kondisi lingkungan di sekitar lokasi penanaman. Hasil penelitian menunjukkan bahwa pertumbuhan semai relatif rendah dengan rata-rata pertambahan tinggi sebesar 1,3 cm per bulan. Tingkat kelangsungan hidup semai juga sangat rendah, di mana hanya sekitar 10% semai yang mampu bertahan hingga akhir periode pengamatan. Penurunan jumlah semai paling signifikan terjadi pada fase awal setelah penanaman yang menunjukkan tingginya kerentanan semai terhadap kondisi lingkungan setempat. Kematian semai diduga dipengaruhi oleh ketidakstabilan sedimen, penimbunan lumpur, keberadaan sampah plastik, penutupan oleh alga hijau (Ulva lactuca), serta organisme penempel seperti teritip yang menghambat proses fisiologis tanaman. Temuan ini menunjukkan bahwa metode penanaman konvensional memiliki tingkat keberhasilan yang rendah pada kawasan pesisir Pulau Serangan dengan tekanan lingkungan tinggi. Oleh karena itu, penerapan metode rehabilitasi yang lebih adaptif dan sesuai dengan karakteristik habitat diperlukan untuk meningkatkan keberhasilan restorasi mangrove di masa mendatang.
Co-Authors ABD. RAHMAN AS-SYAKUR Abd. Rahman As-syakur Abd. Rahman As-syakur Adhisti Riskianisya Adie Wahyudi Oktavia Gama ALAN FRENDY KOROPITAN ANAK AGUNG EKA ANDIANI Anak Agung Eka Andiani AYU PUTU WIWEKA KRISNA DEWI Dennatan, Monalisa DEWA GEDE SEMARA EDI Dionisius Prawira Hidayat Donisius Prawira Hidayat Donisius Prawira Hidayat Dwi Budi Wiyanto Elok Faiqoh GEDE AGUS SURYA PRATAMA Gede Surya Indrawan GEDE SURYA INDRAWAN GEMMA ANTONIA GALGANI I GEDE SUDIARTA I GEDE ADHITIYA YASA I Gede Agus Novanda I GEDE HENDRAWAN I GUSTI AYU ISTRI PRADNYANDARI DEWI I Gusti Ayu Istri Pradnyandari Dewi I GUSTI NGURAH PUTU DHARMAYASA I Gusti Ngurah Putu Dharmayasa I KETUT GINANTRA I KETUT SUDIARTA I Made Abdi Janaguna I Made Gde Sudyadnyana Sandhika I MADE SAKA WIJAYA I Made Saka Wijaya I MADE SAKA WIJAYA I Made Sara Wijana I Made Sara Wijana I Made Yunarta I WAYAN ARTHANA I WAYAN EKA DHARMAWAN I WAYAN EKA DHARMAWAN I Wayan Eka Dharmawan I WAYAN GDE SUTASOMA I WAYAN GEDE ASTAWA KARANG I Wayan Suarjaya IDA AYU ASTARINI Irma Suryanti KHAIRUL ADHA A. RAHIM KWANRUETAI BOONYASANA Maestro Munru Martobi Ndolu Martobi Ndolu Martobi Ndolu Maw, Me Me MIFTACHUDIN SYAIFUL MA'RUF Ni Kadek Noni Purnama Dewi NI MADE DARMADI NI MADE ERNAWATI NI MADE SUARTINI Noventius Manek PONGPIPAT ANANTANASAKUL Putu Angga Wiradana Putu Echa Priyaning Aryunisha PUTU YUDI ADITYA PUTRI Putu Yudi Aditya Putri Rahmadi Prasetijo Rahmat Suhada Lawang Rahmat Suhada Lawang Rahmat Suhada Lawang RASTINA RASTINA Samudra Alfatiha SAMUDRA ALFATIHA Samudra Alfatiha Samudra Alfatiha SANG AYU MADE PUTRI SURYANI TRI PRARTONO