Yulianto Suteja, Yulianto
Program Studi Ilmu Kelautan, Fakultas Kelautan dan Perikanan, Universitas Udayana, Bukit Jimbaran, Bali 80361

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KERAPATAN HUTAN MANGROVE BERBASIS DATA PENGINDERAAN JAUH DI ESTUARI PERANCAK KABUPATEN JEMBRANA-BALI Kresnabayu, I Made Putra; Putra, I Dewa Nyoman Nurweda; Suteja, Yulianto
Journal of Marine and Aquatic Sciences Vol 4 No 1 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (787.967 KB) | DOI: 10.24843/jmas.2018.v4.i01.31-37

Abstract

The mangrove ecosystem is one of the objects that can be identified by using remote sensing technology. The geographical location of the mangrove ecosystem located in the land and sea transition areas provides a distinctive recording effect when compared to other land vegetation objects. Remote sensing information about vegetation density is useful for various needs such as estimation of the availability of wood fuel biomass, succession stages, forest degradation and so on. This study aims to map the mangrove density using NDVI mangrove vegetation index from Landsat 8 image in Estuari Perancak, Jembrana, Bali. The study was conducted on August 20, 2016 until August 25, 2016. The analysis used is correlation analysis and t-Test analysis. Based on the results of the study, it was found that the density class was rare, medium and tight. The density class rarely has a pixel value range from 0.4765 to 0.6128, the medium density class has a pixel value range of 0.6128 to 0.7093, and the dense or dense density has a pixel value range of 0.7093 to 0.7947. The dominant mangrove species is Rhizopora sp. The linear regression equation in the above figure shows y = 0.679x + 0.438 and with the correlation (r) of 0.9642. This means that the density of mangroves and NDVI is directly proportional. Where the higher the value of mangrove density, the higher the value of NDVI and reserve.
BAHAN ORGANIK TOTAL DAN KELIMPAHAN BAKTERI DI PERAIRAN TELUK BENOA, BALI Yuspita, Ni Luh Eta; Putra, I Dewa Nyoman Nurweda; Suteja, Yulianto
Journal of Marine and Aquatic Sciences Vol 4 No 1 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (997.998 KB) | DOI: 10.24843/jmas.2018.v4.i01.129-140

Abstract

Benoa Bay is semi-enclosed waters that have various activities. The existence of these activities will contribute to organic matter in the waters so that the effect on the presence of bacteria. This study aims to determine the total concentration of total organic matter (TOM) and bacterial abundance as well as its spatial and temporal distribution, and to determine the relationship of TOM concentration to bacterial abundance in the waters of Benoa Bay. Data collection is conducted on the surface of the waters in December 2016 to February 2017 when ebb conditions at 5 Benoa Bay water stations. Measurement of organic matter using permanganate test in titimetry based on standard methods SNI 06-6989.22-2004. Measurement of bacterial abundance using Total Plate Count (TPC) method. The TOM concentrations ranged from 63.20 to 65.10 mg/l and bacterial abundances ranged from 30 to 300 CFU/ml. Spatial distribution of TOM concentration and bacterial abundance tends to be higher close to Suwung Landfills (TPA) activity, floating net cage cultivation (KJA) activity in Serangan waters, and Buaji river estuary and tend to be lower approaching Benoa harbor activity and waters further from those activities. The concentration of TOM and bacterial abundance in December 2016 to February 2017 have fluctuating values. Based on the interpretation of the correlation coefficient, the level of relationship between BOT concentration and bacterial abundance in the waters of Benoa Bay is quite strong.
ANALISIS HUBUNGAN KONDISI PERAIRAN DENGAN TERUMBU KARANG DI DESA PEMUTERAN BULELENG BALI Alif, Sabil Al; Karang, I Wayan Gede Astawa; Suteja, Yulianto
Journal of Marine and Aquatic Sciences Vol 3 No 2 (2017)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1112.036 KB) | DOI: 10.24843/jmas.2017.v3.i02.142-153

Abstract

Coral reefs in the village of Pemuteran used for tourism activities. In the process of growth, the coral reef is strongly influenced by the water conditions both physical and chemical factors. This study aims to determine the characteristics of the water based physical and chemical factors, determine the percentage of coral cover, determine the relationship and influence the quality of the waters with coral reefs. Research carried out at Pemuteran Village in Mey 2016. The method used is linear transects and transect quadrant, principal component analysis to determine the effect of water quality parameters and relationships with coral reef. The results of the characteristics of the waters on physical factors, namely temperature 30 ? 31°C, depth 4? 75 m, brightness 13 m, turbidity 1,2 ?5,4 NTU, current velocity 0,1 ? 0,4 m/s, and the substrate of sand. Based on chemical factors, namely salinity 31,25 ? 31,55 ?, pH 6,9?7,5, DO 5,5 ? 6,4 mg/l, BOD5 0,57 ? 0,76 mg/l, TSS 248?504 mg/l, nitrate 0,021 - 0,908 mg/l, and phosphate 0,065-0,95 mg/l. Coral cover percentage point 1 at 50,67%, points 2 at 65%, points 3 at 35%,points 4 at 85,33% and points 5 at 16,67%. While the point 6 - 10 there are no coral reefs. The main components of water quality that affect to the coral reef are the turbidity and substrate. The results show that the correlation of temperature and nitrate correlated very weakly. pH, DO, BOD5 and phosphate correlated enough. Salinity, current, and TSS strongly correlated. Depth, brightness, turbidity and substrate strongly correlate.
DISTRIBUSI SPASIAL KERAPATAN MANGROVE MENGGUNAKAN CITRA SENTINEL-2A DI TAHURA NGURAH RAI BALI Pratama, I Gede Merta Yoga; Karang, I Wayan Gede Astawa; Suteja, Yulianto
Journal of Marine and Aquatic Sciences Vol 5 No 2 (2019)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (715.241 KB) | DOI: 10.24843/jmas.2019.v05.i02.p05

Abstract

Hutan mangrove TAHURA Ngurah Rai merupakan salah satu ekosistem mangrove di Bali yang mengalami kerusakan dan perubahan kerapatan karena faktor alam dan aktivitas manusia. Penginderaan jauh adalah salah satu teknologi yang dapat digunakan untuk estimasi kerapatan tajuk mangrove TAHURA Ngurah Rai. Tujuan dari penelitian ini adalah untuk mengetahui indeks vegetasi terbaik dalam mengestimasi kerapatan tajuk mangrove dan memetakannya secara spasial menggunakan citra Sentinel-2A. Metode penelitian ini adalah menggunakan indeks vegetasi NDVI, EVI dan mRE-SR untuk estimasi kerapatan tajuk mangrove. Pengambilan data lapangan dilakukan menggunakan metode Stratified Random dan Proporsional Sampling dengan mengambil foto kerapatan tajuk menggunakan kamera dengan lensa Fish Eye pada 34 plot. Hasil penelitian ini menunjukkan uji satistik dari model linier indeks vegetasi dengan nilai kerapatan tajuk mangrove pada indeks NDVI (r = 0.8165, R2 = 0.6667, RMSE = ± 8.1508), EVI (r = 0.8597, R2 = 0.7390, RMSE = ± 7.8117), dan mRE-SR (r = 0.9277, R2 = 0.8607, RMSE = ± 4.9571). Kesimpulan dari penelitian ini adalah indeks vegetasi mRE-SR mampu memetakan kerapatan tajuk mangrove lebih baik dari indeks vegetasi NDVI dan EVI dengan akurasi mencapai 86.07 %. Distribusi spasial mangrove yang dihasilkan dari model mRE-SR adalah seluas 1002.22 Ha dengan kerapatan tajuk kategori sangat rapat adalah 3.24 Ha, kerapatan tajuk kerapatan tajuk kategori rapat seluas 94.82 Ha, kerapatan sedang seluas 333 Ha, kerapatan jarang seluas 402.38 Ha dan kategori kerapatan sangat jarang seluas 168.78 Ha.
VARIASI MUSIMAN HUBUNGAN ANTARA PARAMETER OCEANOGRAFI DENGAN HASIL TANGKAPAN IKAN TONGKOL BERDASARKAN DATA HARIAN DI SELAT BALI Sastra, I Gusti Agung Bagus Wisesa; Karang, I Wayan Gede Astawa; As-syakur, Abd. Rahman; Suteja, Yulianto
Journal of Marine and Aquatic Sciences Vol 4 No 1 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (800.638 KB) | DOI: 10.24843/jmas.2018.v4.i01.109-119

Abstract

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
SIMPANAN KARBON PADA PADANG LAMUN DI KAWASAN PANTAI MENGIAT, NUSA DUA BALI Rahadiarta, I Kadek Vidyananda S; Putra, I Dewa Nyoman Nurweda; Suteja, Yulianto
Journal of Marine and Aquatic Sciences Vol 5 No 1 (2019)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (669.166 KB) | DOI: 10.24843/jmas.2019.v05.i01.p01

Abstract

Aktivitas manusia adalah penyumbang gas karbon dioksida (CO2) terbanyak ke udara. Lautan memiliki peranan yang penting dalam siklus karbon, sekitar 93% CO2 di bumi disimpan dalam lautan. Lamun merupakan salah satu tumbuhan laut yang berperan sebagai penyerap karbon di lautan. Padang lamun mampu menyerap karbon dengan rata-rata 0,21 ton/ha dan jenis yang berperan penting yakni Enhalus acoroides. Tujuan penelitian ini untuk mengetahui simpanan karbon pada lamun di bagian atas substrat (daun), bagian bawah substrat (akar dan rhizoma) dan pada setiap jenis lamun yang didapat di Pantai Mengiat. Penentuan titik pengambilan sampel mengacu pada kerapatan lamun yang dilakukan dengan metode purposive sampling. Metode ini diasumsikan bisa mewakili atau menggambarkan keadaan perairan tersebut. Penelitian ini menggunakan metode pengabuan kering yang dilakukan dengan penghancuran komponen sampel pada suhu 500oC di dalam tanur listrik. Hasil penelitian menunjukkan kandungan karbon lamun pada bagian bawah substrat (akar dan rhizoma) sebesar 25.70 gC/m2, sedangkan bagian atas substrat (daun) sebesar 17.18 gC/m2. Kandungan karbon pada bagian bawah substrat lebih tinggi daripada bagian atas substrat karena karbon akan terakumulasi di sedimen. Jenis lamun yang didapat di Pantai Mengiat yaitu Thalassodendron ciliatum, Thalassia hemprichii, Cymodocea serrulata, Halodule uninervis, Cymodocea rotundata, dan Syringodium isoetifolium, dimana kandungan karbon tertinggi yaitu 62.46 gC/m2 dimiliki jenis Thalassodendron ciliatum, sedangkan kandungan karbon terendah yaitu 17.25 gC/m2 dimiliki jenis Syringodium isoetifolium.
DISTRIBUSI SPASIAL TOTAL PADATAN TERSUSPENSI PUNCAK MUSIM HUJAN DI PERMUKAAN PERAIRAN TELUK BENOA, BALI Risuana, I Gede Surya; Hendrawan, I Gede; Suteja, Yulianto
Journal of Marine and Aquatic Sciences Vol 3 No 2 (2017)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (935.738 KB) | DOI: 10.24843/jmas.2017.v3.i02.223-232

Abstract

Benoa Bay is semi- enclosed bay, which has embouchures. The existence of embouchures are able to contribute the Total Suspended Solid (TSS) to the Bay. As the one of pollution parameter, TSS could be influencing the ecosystem of coral reefs, seagrass, and the existence of dissolved oxygen. This research was aimed to know the spatial distribution of TSS on the surface layer in Benoa Bay. Sample was taken on January 2016, in flood and ebb. TSS was analyzed using gavimetry method based on SNI No. 06-6989.3-2004. Spatial distribution was analyzed by interpolation method- Inverse Distance Weighted (IDW). The concentration range of TSS on January in ebb to tide and tide to ebb was 22.44 mg/L to 261.33 mg/L. The highest distribution in flood was dominated in around of embouchures. It was suspected by inputs of suspended matter from land to the bay. In tide to ebb condition, TSS concentration was high in some areas, such as around the embouchures, midlle and mouth area of bay. The high concentration was suspected by pattern of tidal current in Benoa Bay. The pattern of current in ebb was leaving to the mouth of Benoa Bay, therefore the TSS concentration dispersed to the mouth of the bay.
BEBAN PENCEMAR DAN KAPASITAS ASIMILASI AMONIUM DAN NITRAT SAAT PUCAK MUSIM BARAT DI TELUK JAKARTA Suteja, Yulianto
Journal of Marine and Aquatic Sciences Vol 2 No 1 (2016)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (344.211 KB) | DOI: 10.24843/jmas.2016.v2.i01.16-22

Abstract

Jakarta Bay is a bay that has an important role in Jakarta, but the activity in this area lead to the potential for pollution mainly ammonium and nitrate. Pollution peaks generally occur during the rainy season (west monsoon). Pollution that enters the bay can be neutralized naturally by water as long as the amount does not exceed the asimilation capacity. This study aims to calculate the total input (load), assimilation capacity, and residence time of ammonium and nitrate in Jakarta Bay in the rainy season. Data from this study is derived from secondary data. For the total input of pollutants are calculated from the input stream, the atmosphere and the boundary. From the research found that the Jakarta Bay had a total load of pollutants NH4 at 115.8 x 109 mmol N /month and NO3 46.5 x 109 mmol N/month. The biggest contributor to the pollution comes from the boundary NH4 is 56.9% and NO3 from the river 70.1%. Load from Citarum river for NH4 around 3.8 x 1010 mmol N/month and NO3 around 3.0 x 1010 mmol N/month higher than Marunda, Priok and Angke the rivers. Assimilation capacity of Jakarta bay  for NH4 around 25.7 x 109 mmol N /month and NO3 of 24.1 x 109 mmol N /month. It shows the total load of pollutants entering the Jakarta Bay is greater than the assimilation capacity. The residence time of water in the Bay of Jakarta is 13.3 days longer than the residence time of NH4 and NO3 which were only 8.6 and 9.2 days.
DISTRIBUSI NITRAT DAN FOSFAT SECARA SPASIAL DAN TEMPORAL SAAT MUSIM BARAT DI PERMUKAAN PERAIRAN TELUK BENOA, BALI Rahayu, Ni Wayan Sukma Taraning; Hendrawan, I Gede; Suteja, Yulianto
Journal of Marine and Aquatic Sciences Vol 4 No 1 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1628.94 KB) | DOI: 10.24843/jmas.2018.v4.i01.1-13

Abstract

Benoa Bay is an estuary that effected by pollutan from river and human activity. Reasearch on spatial and temporal distribution of nitrate and phosphate has been conducted in Benoa Bay. Data was collected at water surface during ebb from December 2016 to Februari 2017. There were19 Sampling pointlocated in Benoa Bay and 6 pointslocated in rivers around Benoa Bay. Nitrate was analysed using Brucine method and phosphate was analysed using Amm-Molybdat method. The concentration of nitrate from December 2016 to February 2017 ranged from 0,036 mg/L to 1,154 mg/L and the concentration of phosphate ranged from undetectedto 0,739 mg/L. The concentration of nitrate at rivers ranged from undetectedto 3,584 mg/L andthe concentration of phosphate ranged from undetectedto2,405 mg/L. The concentration of nitrate and phosphate from December 2016 to February 2017 was fluctuating and the highest average concentration of nitrat and phosphate was found in February 2017. These was due to high rainfall in February 2017 and cause a lot of organic matters carried by the rivers into Benoa Bay. The highest distribution concentration of nitrate and phosphate was found around estuary. These due to input of organic matters from mainland through the rivers. Based on water quality standards of Bali Goverment, the concentration of nitrate and phosphate was exceeds the seawater quality standart.
HUBUNGAN KEPADATAN BULU BABI (ECHINOIDEA) DAN TUTUPAN TERUMBU KARANG PADA KAWASAN INTERTIDAL PANTAI SANUR Sari, Tiara Permata; As-syakur, Abd. Rahman; Suteja, Yulianto; Wiyanto, Dwi Budi
Journal of Marine and Aquatic Sciences Vol 3 No 2 (2017)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (757.93 KB) | DOI: 10.24843/jmas.2017.v3.i02.134-141

Abstract

Marine intertidal region is an area that is affected by the mainland. One of the ecosystems found in the intertidal area is the coral reef ecosystem. Urchin is one that lives on these ecosystems. Sanur Beach area has coral reefs and the intertidal zone is quite extensive. The many activities and cruise tourism in Sanur Beach will indirectly affect the life of coral reefs and associated animal in it in this case urchins. The purpose of this study was to determine the relationship density of sea urchins and coral reefs cover percentage in the intertidal area on Sanur Beach. Research done during low tide. Coral reef data collection method and the density of sea urchins using 5x5m quadratic transects were analyzed using Pear Person bivariate correlations. Urchin densities ranging between 0-2.04 ind/m2. The percentage cover coral reefs ranged from 0.1- 17.9%. High and low density of sea urchins and the percentage of coral reefs affected allegedly incompatibility place their lives and because of pressure from community activities in Sanur. The density of sea urchins and the percentage of coral cover has a significant relationship with a strong degree of correlation is 0.79. Positive direction on that relationship means that the higher percentage of coral reefs, the higher density of sea urchins. This assume in which they live almost the same that is in need of a hard substrate and urchins use of coral reefs as a shelter.