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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis Indonesian Journal of Geography Journal of Marine and Aquatic Sciences Buletin Udayana Mengabdi Ecotrophic, Journal of Environmental Science REKAYASA INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Geografi Journal of Marine Research and Technology International Journal of Remote Sensing and Earth Sciences (IJReSES) INTERNATIONAL JOURNAL OF ENVIRONMENT AND GEOSCIENCES International Journal of Environmental, Sustainability, and Social Science The International Journal of Remote Sensing and Earth Sciences (IJReSES)

I Wayan Gede Astawa Karang

Faculty Of Marine Science And Fisheries, Udayana University, Bukit Jimbaran, Bali 80361

Author-ID : 519235

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Library & Information Science Materials Science & Nanotechnology Physics Social Sciences Other

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Estimasi Persentase Karbon Organik Di Hutan Mangrove Bekas Tambak, Perancak, Jembrana, Bali I Gusti Agung Indah Mahasani; Nuryani Widagti; I Wayan Gede Astawa Karang
Journal of Marine and Aquatic Sciences Vol 1 No 1 (2015)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Mangrove forests in the coastal regions are very effective and efficient in reducing the concentration carbon dioxide (CO2) in the atmosphere, because mangroves can absorb CO2 through photosynthesis by diffusion through the stomata and then store carbon in the form of biomass. The purpose of this study, namely: (1) Determine the percentage of organic carbon in the soil in former mangrove forest ponds in Perancak and (2) Determine the vertical variation of the percentage of organic carbon stored in soils in former mangrove forest ponds in Perancak. The method used from this study is the loss on ignition (LOI). The average percentage of organic carbon in mangrove forest area of the former farm of 50.181 % C or 184.618 Mg/ha. The average vertical variations of each depth, that is: depth (0-15 cm) 50.487 % C, (15- 30 cm) 50.781 % C, (30-50 cm) 50.550 % C, (50- 100 cm) 51.689 % C, and (> 100 cm) 47.396 % C.

Variasi Musiman Hubungan Antara Parameter Oceanografi Dengan Hasil Tangkapan Ikan Tongkol Berdasarkan Data Harian Di Selat Bali I Gusti Agung Bagus Wisesa Sastra; I Wayan Gede Astawa Karang; Abd. Rahman As-syakur; Yulianto Suteja
Journal of Marine and Aquatic Sciences Vol 4 No 1 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Mackerel fish that classified pelagic fish and an export commodity in Indonesia. Distribution of mackerel fish are foundn all Indonesian waters, one of them in the Bali Strait. Distribution of mackerel fish influenced by oceanographic condition such as sea surface temperature (SST) and chlorophyll-a concentration. SST and chlorophyll-a concentrations are environmental parameters that can provide information on fishing ground. The purpose of this research is explained the temporal fluctuation and relationship between SST and chlorophyll-a concentration with mackerel fish had been catch in Bali Strait waters during 2011-2016. Data were analyzed using simple correlation analysis with 95% confidence interval. Temporally, the highest average SST occurred during the transition season I (March-May) and the lowest in the east season (June-August). The highest average chlorophyll-a concentration occurs in the east season and the lowest in the west season (December-February). The highest catch of mackerel fish occurred during transitional season II (September-November) and lowest in west season. The association between SST and chlorophyll-a concentration on mackerel fish catch showed low correlation with significant relationship, whereas concentration between SST and chlorophyll-a concentration strong with significant correlation

Karakterisitk Pantulan Spektral Citra Landsat 8 Pada Area Pasang Surut: Studi KasusTeluk Benoa, Bali I Wayan Gede Astawa Karang
Journal of Marine and Aquatic Sciences Vol 2 No 2 (2016)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Benoa bay is a tidal area located in the southern part of Bali island. Several study of physical aspect of sea water in the Benoa bay has been done using remote sensing data. At this moment there aren’t studies about the relationship between the tidal condition and the spectral response. For this reason, the aim of this work is to study the characteristic of spectral response of satellite data linked to tidal variation. To meet the goal, Landsat TM 8 images were used in eight different dates ranging from March 2014 to May 2015. The methodology included techniques such as radiometric corrections, cropping and statistical analysis for band 1 to 7. The results indicate that when landsat 8 images acquired, Benoa Bay has a tidal elevation from -0.121 to 0.857. The spectral responses for the sea water body show a contrast between the visible and infrared regions. There isn’t clear correlation between tidal water variation and its spectral behavior of infrared regions; it depends rather on the presence or absence of sediments and vegetation in the water as shown in the visible region with moderate correlation 0.65 (Band 1) and 0.67 (Band 2).

Efektifitas Umpan Tiruan yang Berbeda Warna Terhadap Hasil Tangkap Ikan tongkol (Euthynnus sp) di Perairan Tenggara Karangsem Bali I Kadek Dedy Antara Putra; I Wayan Gede Astawa Karang; Elok Faiqoh; Abd. Rahman As-syakur
Journal of Marine and Aquatic Sciences Vol 6 No 2 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i02.p8

Catching Tuna Fish (Euthynnus sp.) in territorial waters of Southeast Karangasem, Antiga Kelod Village using trolling is very influenced by the type of baited. In a manner line, there are two type of baited that used for trolling, fishworm and lure. The objective of this research is to determine the effectiveness and the effect of lure on tuna fish catch (Euthynnus sp.) In territorial waters of Southeast Karangasem, Antiga Kelod Village. All of three baits are made about the size of the baits and have the same color, there are blue-white, red-white, and green-white, and it’s operated simultaneously on one unit trolling line for 12 times . This research using descriptive comparative analysis and complete randomized design statistic analysis (RAL). The results of this research obtain, the blue-wait color of the bait can produce 146 tuna fish (Euthynnus sp.) with an effectiveness value 34.27%, with average value of results catch is 12 tails on once trip. While for red-white color, produce 220 tuna fish with an effectiveness value 51.64%, and the average value of results catch is 18 tails on once trip, and the produce of green-white color is 60 tuna fish with effectiveness value 14.08%, the average outcome catch 5 tails on once trip. Based on the results of the research The red-white bait was a bait with the highest catch and the highest effectiveness value.

Daya Dukung Ekosistem Mangrove Terhadap Hasil Tangkap Nelayan di Taman Hutan Raya Ngurah Rai, Bali Jero Ketut Tri Ayu Lestari; I Wayan Gede Astawa Karang; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 4 No 1 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Mangrove ecosystem is a complex ecosystem. The sustainability of fish resources is highly dependent on the sustainability of the mangrove ecosystem. The purpose of this research is to know the mangrove density, fish catching from fisherman in mangrove area and relationship of mangrove vegetation and the quality of the waters with the fish catching in the mangrove. Data collections include mangrove condition, fish catching, and water environment parameter. Research conducted in the mangrove area Mina Werdhi Batulumbang (TP I) and Simbar Segara (TP II). The results of this study found 5 species of mangrove. The density values of species at research site I ranged between 0.02 ind / m2 - 0.08 ind / m2. While the density value of species in this research site II ranged between 0.01 ind / m2 - 0.07 ind / m2. Rhizophora mucronata type has the highest density. Fish catching is the largest average in research place I, that is 1.42 kg /day /fisherman with mangrove area 2,397 Ha and the research of site II shows that the fish production of fisherman catches of 0,8 kg / day / fisherman with mangrove area 1,986 Ha. There is a positive relationship between the density and area of mangrove with the number of fish catching, where the fish catching will increase when the mangrove area also increases and there is a strong relationship between the catch and dissolved oxygen.

Distribusi Spasial Kerapatan Mangrove Menggunakan Citra Sentinel-2A Di TAHURA Ngurah Rai Bali I Gede Merta Yoga Pratama; I Wayan Gede Astawa Karang; Yulianto Suteja
Journal of Marine and Aquatic Sciences Vol 5 No 2 (2019)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

The mangrove forest of TAHURA Ngurah Rai is one of the mangrove ecosystems in Bali that suffered damages and density changes due to natural factors and human activities. Remote sensing is one of the technology that can be used to estimate the density of mangrove canopy in TAHURA Ngurah Rai. The purpose of this study was to find the best vegetation index for estimating mangrove canopy density out and map it spatially using Sentinel-2A image. The method of this research is using vegetation index NDVI, EVI and mRE-SR to estimate mangrove canopy density. Field data was collected using Stratified Random and Proportional Sampling method by taking photo of the density of canopy using camera with Fish Eye lens on 34 plot. The results of this study show the satistic test of the linear model of the vegetation index with the mangrove canopy density value on the NDVI index (r = 0.8165, R2 = 0.6667, RMSE = ± 8.1508), EVI (r = 0.8597, R2 = 0.7390, RMSE = ± 7.8117), and mRE-SR (r = 0.9277, R2 = 0.8607, RMSE = ± 4.9571). The conclusion of this research is mRE-SR vegetation index able to map mangrove canopy density better than NDVI and EVI vegetation index with 86.07% accuracy. The mangrove spatial distribution generated from the mRE-SR model is 1002.22 Ha with 3.24 Ha categorized as very high density, 94.82 Ha categorized as high density, 333 Ha categorized as medium density, 402.38 Ha categorized as low density, and categorized as very low density is up to 168.76 Ha.

Laju Dekomposisi Serasah Daun Mangrove Bruguiera gymnorrhiza dan Sonneratia alba di Kawasan Hutan Mangrove Pulau Penyu, Tanjung Benoa, Bali Artha C. Rosevina Anak Ampun; I Wayan Gede Astawa Karang; Yulianto Suteja
Journal of Marine and Aquatic Sciences Vol 6 No 1 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i01.p12

Mangroves are plants that play an important role in maintaining the fertility of mangrove ecosystems by contributing organic material derived from leaf litter. The rate decomposition of leaf litter is a destruction process by dead organisms into smaller particles. The decomposition process of mangrove leaf is affected by lignin and wax in nitrogen supply, environmental conditions, abundance of organisms, and air temperature. This research aims to determine the decomposition rate of leaf litter and percentage decomposition of Bruguiera gymnorrhiza and Sonneratia alba in mangrove forest area in Penyu Island, Tanjung Benoa, Bali. This research was conducted from February to April 2017. The method in this research used litter trap method. The location of the stations was based on the distance of the mangrove trees to the sea. Litter traps were placed on the six (6) stations. During the 60 days of decomposition process, Sonneratia alba leaf was decomposed faster than Bruguiera gymnorrhiza. The highest decomposition rate of Sonneratia alba leaf litter found at station 1 (1.7 g/day) with 99.9% decomposed, and the lowest at station 2 (1.38 g/day) with 99.64% decomposed. The highest decomposition rate of Bruguiera gymnorrhiza leaf litter found at station 1 (1.52 g/day) with 98.88% decomposed, and the lowest at station 2 (0.99 g/day) with 84.66% decomposed.

Studi Laju Perubahan Garis Pantai di Pesisir Tenggara Bali Menggunakan Citra Satelit Landsat (Studi Kasus Kabupaten Gianyar dan Klungkung) I Nengah Jaya Nugraha; I Wayan Gede Astawa Karang; I Gusti Bagus Sila Dharma
Journal of Marine and Aquatic Sciences Vol 3 No 2 (2017)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Erosion and abrasion are the events that led to the beach shoreline position changes. The impact of climate change is the rise in sea level also causes changes in the coastline. South East coast of Bali, especially along the coast Gianyar and Klungkung changing coastline. This study aims to identify and calculate the rate of shoreline change in Gianyar and Klungkung from 1995 to 2015. The study was a preliminary information shoreline change and do not analyze the causes such as tides, currents, waves, and wind. The method used remote sensing analysis with the extraction of the coastline from the Landsat 5 satellite images in 1995, Landsat 7 in 2005, and Landsat 8 2015. Landsat imagery analyzed by a combination of methods approach the threshold and band ratio of wave infrared and green. Image processing using software Quantum GIS 2.8 and System for Automated Geoscientific Analyses (SAGA) GIS 2.2, extention Digintal Shoreline Analysis System (DSAS) to make calculations transect coastline. The results of the analysis of overlaying identify coastline in Gianyar and Klungkung change at a rate that varies every village. The rate of change of coastline in Gianyar due to accretion between 0.5096 - 8.6074 m / yr, while due to erosion between -3.7343 to -1.3201 m / yr. The rate of change in Klungkung regency coastline due to accretion between 0.6337 - 2.6875 m / yr, while due to erosion between -8.8795 to -0.8833 m / yr.

Analisis Temporal Suhu Permukaan Laut di Perairan Indonesia Selama 32 Tahun (Era AVHRR) I Nyoman Januarta Triska Putra; I Wayan Gede Astawa Karang; I Dewa Nyoman Nurweda Putra
Journal of Marine and Aquatic Sciences Vol 5 No 2 (2019)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

One of the important factor that influences global climate dynamics is sea surface temperature (SST). Indonesian waters are semi-closed and located between the Pacific and Indian Oceans so that they have different characteristics of SPL in each region. The purpose of this research is to know the trend and local characteristics of Indonesian SST and adjacent areas in response to 6-monthly and seasonal variability with moving average method and correlation. The data used are SST data from AVHRR satellite with domain 15°N-15°S, 90°-145° E. The results showed of increase trend 0.34°C in Indonesian sea for 32 years (1981-2012). The characteristics of SST in Indonesian territory are closely related to the Mosoon cycle where in the East period in the northern region the Natuna Sea is warmer in contrast to the West monsoon period, in the southern part of the Arafura Sea to the warmer Sawu Sea and around the equator experiencing the warmest in the transitional period. The moving-average analysis shows that 6-monthly variability appears to be dominated in equatorial waters including the Java Sea and Banda Sea whereas seasonal variability occurs in the northern and southern regions of Indonesia's waters including the Pacific Ocean Oceans, the northwest Pacific Ocean and the southeast Indian Ocean. Based on correlation analysis, ENSO has a strong (negative) relationship in eastern Indonesia waters including the Sea in the northern part of Papua and the northwest Pacific Ocean while IOD has a strong (negative) relationship in the western Sumatra Sea, Banda Sea and Arafura Sea.

Laju Pertumbuhan dan Tingkat Kelangsungan Hidup Transplantasi Karang Acropora secale di Pantai Serangan dan Pantai Geger, Bali Luh Putu Ayu Depi Nurcahyani; I Wayan Gede Astawa Karang; Widiastuti Widiastuti
Journal of Marine and Aquatic Sciences Vol 4 No 2 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

The status of Indonesian coral reefs are in fair to poor categories, therefore it requires more approaches in order to recover the natural ecosystem. One of the reef restoration method is coral transplantation. Genus Acropora is one of the main constituent of reefs in the Indo-Pacific waters. Reef transplantation may not only rehabilitate the damaged reef, but also an effective way to collect coral for economic purposes. Acropora secale has high economic value as aquarium ornament, however it is vulnerable to the environmental stress and marine pollution. Therefore, finding the suitable transplantation location is one of important part in the transplantation. The objective of this research is to investigate the growth of transplant A. Secale at Serangan and Geger Beach which has different morphology feature. A. secale was Transplanted for 3 months on the 2 x 1 m table with 16 fragments and observed each week. The results obtained are total growth and growth rate of A. secale transplanted on Serangan Beach is significant higher than Geger Beach (P<0.05). The total growth of A. secale on Serangan Beach is higher by 0,83 cm, wider by 0,61 cm, and branches are more 7 branches than Geger Beach. The growth rate of A. secale at Serangan Beach was higher by 0,27 cm/month and wider by 0,21 cm/month than Geger Beach. The survival rate of A. secale on Serangan Beach and Geger Beach is 100% which means that all transplanted corals survive until the end of the study.

Co-Authors Abd. Rahman As-syakur Alexis Chappuis Anak Agung Istri Candra Kirana Anisa Dea Novianti Artha C. Rosevina Anak Ampun Astaman, I Dewa Made Khrisna Putra Astiti Ratnasari Astiti Ratnasari Azhar Muhammad Hanisa Brasika, Ida Bagus Mandhara Chonnaniyah Chonnaniyah Chonnaniyah, Chonnaniyah Cindi Ayu Lestari Cornelia Coraima Lazaren Dian Novianto Dwi Budi Wiyanto Dwi Nindra Saputra Eka Andiani, Anak Agung Elok Faiqoh Elvita Rahmani Fitra Cahya Prima Fumihiko Nishio Gede Dicky Pradipta Wedayana Gede Indra Putra Pratama Gede Surya Indrawan Gilang Pratama I Dewa Ayu Ratna Raksa Eka Putri I Dewa Nym. Nurweda P., I Gede Andika Wijantara I Gede Hendrawan I Gede Merta Yoga Pratama I Gede Mita Anjas Swara I Gusti Agung Bagus Wisesa Sastra I Gusti Agung Indah Mahasani I Gusti Bagus Sila Dharma I Gusti Bagus Sila Dharma I Kadek Dedy Antara Putra I Ketut Suta Negara I Made Ekayana I Nengah Jaya Nugraha I Nyoman Januarta Triska Putra I Putu Trisna Buana Putra I Wayan Arthana I Wayan Eka Dharmawan I Wayan Krisna Eka Putra I Wayan Krisna Eka Putra I Wayan Matsya Deva Nagendra I Wayan Matsya Deva Nagendra I Wayan Nuarsa IDA AYU ASTARINI IPG Eka Handrayana Putra Irwan Jatmiko Jero Ketut Tri Ayu Lestari Kadek Bagus Padmaningrat Kadek Dwi Artama Kadek Setiya Wati Kholifatul Aziz Kuncoro Teguh Setiawan Kuncoro Teguh Setiawan Luh Made Chandra Luh Made Chandra Luh Putu Ayu Depi Nurcahyani Made Narayana Adibhusana Made Ryan Dwiputra Made Suartana Naila Makfiya Ni Kadek Martini Ni Luh Kade Paramita Kusuma Ni Luh Putu Ayu Sumarni Ni Luh Putu Ratih Pravitha Ni Luh Putu Ria Puspitha Ni Putu Eva Damayanti Nidzar Muhammad Rafly Nikmah Fitria Nuraini Nuryani Widagti Pande Ketut Cahya Krisnanta Arioka Putra Bagus Panji Pamungkas Putra, I Nyoman Giri Putu Bagus Angga Utama Putu Eka Tulistiawan Rony Clinton Sabil Al Alif Syifa’ul Qolbiyatun Nisa Takahiro Osawa Takahiro Osawa Takahiro Osawa Takahiro Osawa Takahiro Osawa Takahiro Osawa Takahiro Osawa Takahiro Osawa Tulistiawan, Putu Eka Valenthio Sidauruk Wati, Kadek Setiya Widiastuti Karim Widiastuti Karim Widiastuti Widiastuti Widiastuti Widiastuti Yasa, Putu Kumara YASUHIRO SUGIMORI Yasuhiro Sugimori Yoga Ibnu Graha Yulianto Suteja

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