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Journal of Marine Research and Technology
Published by Universitas Udayana
ISSN : 26210088     EISSN : 26210096     DOI : 10.24843/JMRT
Core Subject : Science,
Earth & Planetary Sciences
The Journal of Marine Research and Technology (JMRT) (p-ISSN 2621-0088 | e-ISSN 2621-0096) is an open access, scientific journal that aims to publish the dynamic of the coastal and ocean, its ecosystems and coastal environment, and Observation technology. JMRT is a peer-reviewed journal publishes original articles and critical reviews of current issues in marine science and technology. The range of topics extends from research in Oceanography, marine habitats, living resources, management and conservation issues related to the marine resources. This includes remote sensing, ocean modelling, geographic information System (GIS), coastal engineering, coastal processes, marine instrument, ecology, genetics, marine pollution, fisheries, marine ecotourism, and it's economic and social. JMRT provides a forum for the discussion and sharing all the latest issues in marine research and technology. Editorial manager system is an online manuscript submission, review and tracking system. JMRT is issued twice a year, each February and August.
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Articles 91 Documents
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Karakteristik Vertikal Salinitas dan TDS di Perairan Amed dan Tulamben, Karangasem, Bali Gede Indra Putra Pratama; I Gede Hendrawan; I Wayan Gede Astawa Karang; Alexis Chappuis
Journal of Marine Research and Technology Vol 3 No 1 (2020): FEBRUARI 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1171.599 KB) | DOI: 10.24843/JMRT.2020.v03.i01.p08

Abstract

Amed and Tulamben waters are marine tourism areas located in the western part of the Lombok Strait, which have enormous biodiversity and conservation potential. The abundant biodiversity in the area is because of the process of transporting water masses vertically carrying biogenic and non-biogenic components. Salinity and TDS have an important role in regulating the process of bio-geo-chemical waters. Thus, it can be a parameter in understanding the vertical characteristics of the waters. The purpose of this research was to determine the vertical characteristics of temporal salinity and TDS in these waters. Data was collected for 14 days (February 20 to March 5, 2019) at two locations, namely Batu Niti and Emerald. The data collection method was carried out by reducing the CTD to a depth of approximately 95 meters with a measurement interval of 10 minutes for 2 to 3 hours per day. The results showed that salinity and TDS had a very strong correlation (r = 0.9995). Salinity concentrations ranged from 31.83 to 34.19 PSS, and TDS concentrations ranged from 31,211.12 to 33,396.71 mg l-1. The halocline layer had a gradient characteristic ? 0.01 PSS m-1 found from a depth of 20 meters, while a homogeneous layer was formed above it to a depth of 6 meters. The halocline layer had a higher level of water mass stability (N) than the homogeneous layer. The maximum rate of change in salinity and TDS was found at a depth of 70 meters. The great variability of salinity and TDS in the water column was indicated by the influence of internal tidal currents. Before the highest tide conditions, salinity and TDS have highest variability that compared to the highest tide condition and after its condition.
Karakteristik dan Sebaran Sampah Terdampar di Kawasan Pesisir Taman Nasional Bali Barat Putra Bagus Panji Pamungkas; I Gede Hendrawan; I Nyoman Giri Putra
Journal of Marine Research and Technology Vol 4 No 1 (2021): FEBRUARI 2021
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2021.v04.i01.p02

Abstract

The existence of marine debris can be a threat to marine ecosystems. Several studies have shown that marine debris can cause death of marine organisms and a degradation of ecosystems. The West Bali National Park (TNBB) is a conservation area in Bali that is also susceptible to be affected by marine debris pollution, due to its high population and anthropogenic activity in the area. Bali generates about 4.281 tons of waste per day, where 11% of it ends up in the ocean. Therefore, research about marine debris in TNBB is important. The purpose of this research is to find out the characteristics and distribution of stranded marine debris in the TNBB coastal area. This research was conducted in February 2020 at 23 stations by the shoreline. Marine debris data collection was carried out by adapting the method developed by the Commonwealth Scientific and Industrial Research Organization (CSIRO) Global Plastic Pollution Project. Marine debris exists along the coastline with the concentration range between 0.05 – 28.47 items/m2 with the average of 4.29 items/m2. As much as 92.3% of waste were plastic, dominated by three major debris classes, including soft plastic (44.8%), foam (30.8%), and hard plastic (12.4%). Marine debris in the area has various sizes and shapes. As much as 57.9% of debris at TNBB were whole items and the rest of it were fragment items. Marine debris size at TNBB tend to have a big relative size, i.e. between 8-16 cm (32%). Generally, marine debris at TNBB were mostly daily consumer items. Therefore, public awareness play an important role to decrease the amount of marine debris on the TNBB coastal area.
Analisis Perubahan Penggunaan Lahan Pesisir Di Kecamatan Batu Layar, Kabupaten Lombok Barat Pada Tahun 2002 dan 2019 Mark Johannes Wiggers; I Wayan Nuarsa; I Dewa Nyoman Nurweda Putra
Journal of Marine Research and Technology Vol 3 No 2 (2020): AGUSTUS 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2020.v03.i02.p02

Abstract

The coastal zone is a unique region because the coastal area is a meeting place of land and sea. Coastal areas are vulnerable to various human activities that can affect the terrestrial and marine environment both directly and indirectly. This can result in changes in land use, especially in coastal areas. Rapid changes in land use in coastal areas due to the development of tourist areas and the high level of erosion and abrasion that occurs causes the need for planned, comprehensive and sustainable land management planning and regional development. the purpose of this study was to determine land use, land use changes and the level of accuracy of landsat imagery in coastal areas of Batu Layar District, West Lombok Regency. This study uses the Quantum GIS software to analize Landsat satellite imagery data in 2002 and 2019. The results showed that the land use change during of 17 years (2002 - 2019), namely the residential and building classes increased by 237.69 ha and while the bush class , forests, plantations, rice fields, open land and waters respectively decreased by 71.91 ha, 61.2 ha, 46.44 ha, 32.4 ha, 20.79 and 5.04 ha respectively. The Overall Accuracy of this study was 90%.
Pertumbuhan Transplan Karang Lunak Sinularia polydactyla dan S. asterolobata Berdasarkan Metode Tebar Dasar dan Penempelan Substrat Pada Lokasi yang Berbeda I Dewa Anom Agung Dwi Putra Jayantika; IGB Sila Dharma; Widiastuti Widiastuti
Journal of Marine Research and Technology Vol 4 No 1 (2021): FEBRUARI 2021
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2021.v04.i01.p07

Abstract

Soft coral transplantations are widely used for rehabilitation of coral reef ecosystems and commercial needs with common method are substrated-attached and placed on the metal table frame. These methods are considered as costly. This study aimed to examine the difference in the average growth of transplanted soft corals Sinularia polydactyla and S. asterolobata, spreading on the seabed and substrate-attached methods at different location. Transplantation was conducted inside and outside Pegametan Bay, Buleleng. Soft coral fragments were spread on the seabed and attached with cement. The increased sizes and survival rates of the transplanted soft corals were observed every two weeks. The differences in the average growth rates among soft coral species, transplantation methods and locations were analyzed by three-factor ANOVA and survival rates were analyzed by using the Log-Rank test. The results showed no significant difference in the average growth rates between S. polydactyla and S. asterolobata (P =0,104) and transplantation methods (P=0,141). The average growth rate of transplanted soft corals outside was significantly higher (P=0,025) than those inside the bay. This study indicated that the interaction between soft coral species, methods, and location significantly differed the average growth rates of the transplanted soft corals. The average survival rates demonstrated that there was no significant difference among transplanted soft coral species within similar locations in both methods. In contrast, the average survival rates of transplanted soft coral outside were significantly higher than those inside the bay in both methods that reached >80%.
Karakteristik Mikroplastik Pada Ikan Laut Konsumsi Yang Didaratkan Di Bali Samantha Julia Blandina Lumban Tobing; I Gede Hendrawan; Elok Faiqoh
Journal of Marine Research and Technology Vol 3 No 2 (2020): AGUSTUS 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2020.v03.i02.p07

Abstract

Studies over the past decade have shown that microplastics are widespread in marine environments, at sea level, on coastlines, and the seabed. Microplastic sources come from small particles used in the cosmetic industry and plastic industry base materials. Other microplastic sources emerge through the degradation of larger pieces of plastic in the environment due to physical and chemical processes, caused by light, heat, oxygen, water, and organisms. Microplastics tend to be digestible by marine organisms and potentially transferred to higher trophic organisms through the food chain, and thus toxic pollutants will potentially harm marine organisms and even humans through bioaccumulation and biomagnification. This research was conducted to determine the characteristics of microplastics that pollute marine fish consumption that is landed in Bali. Samples were gathered from traditional fishermen who landed their catch in Bali. Microplastic is identified in the digestive tract of fish. The samples of fish obtained by Decapterus spp (Selayang), Auxis Rochei (tongkol), Rastrelliger spp (kembung), and Sardinella lemuru (Lemuru). 39 fish out of the total identified 89 fish were found to be contaminated with 69 microplastics (fiber, fragments, film) and 1 mesoplastic (fragment). The size of the plastic found is between 0.32 to 22 mm. The abundance of microplastics in fish caught in Bali's waters is 0.78 (SD 1.15) particles/fish. The finding of microplastics in the digestive tract of fish caught by traditional fishermen in Bali is feared to have the potential to harm marine organisms and even humans through the process of bioaccumulation and biomagnification.
Skrining Fitokimia Ekstrak Daun Mangrove Rhizophora mucronata dan Rhizophora apiculata yang Dikoleksi dari Kawasan Mangrove Desa Tuban, Bali Alanis Ismi Akasia; I Dewa Nyoman Nurweda Putra; I Nyoman Giri Putra
Journal of Marine Research and Technology Vol 4 No 1 (2021): FEBRUARI 2021
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2021.v04.i01.p03

Abstract

The content of secondary metabolite compounds in marine plants, especially mangrove has a certain bioactivity. Therefore, this study was aims to determine the content of secondary metabolites in the mangrove leaf extract of Rhizophora apiculata and Rhizophora mucronata. This study was conducted on January-April 2020. Sampling locations were carried out in the Mangrove Conservation Area of Tuban Village, Bali. In this study, samples were collected in the form of old leaves. The samples were taken in three sites and in each sites, 500 gr of leaves were collected randomly for each species. Therefore, in total we have 1.5 kg of leaves for each species. Samples are then extracted and tested to determine the content of secondary metabolites. The results showed the content of secondary metabolites in the leaves of R. apiculata mangrove were phenols, alkaloids, flavonoids, tannins, saponins, steroids while R. mucronata contained phenols, flavonoids, tannins, saponins, terpenoids.
Studi Pola Pergerakan dan Lama Waktu Tinggal Partikel di Kawasan Perairan Nusa Penida, Bali Ida Bagus Andika Putra; I Gede Hendrawan; I Dewa Nyoman Nurweda Putra
Journal of Marine Research and Technology Vol 3 No 2 (2020): AGUSTUS 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2020.v03.i02.p03

Abstract

Nusa Penida is a tourist destination, located on the east of Bali, which is well-known of its natural panoramic. Increasing tourism sector in Nusa Penida may have positive impacts, but it can also have negative impacts, such as an increase in the amount of waste and other pollutants, which will eventually be discharged into the waters. High concentration of pollutant can reduce water quality. The water quality in the sea can be control by the residence time, and the sea current would spread waste in the ocean. Based on these problems, it is important to conduct a research on the movement and length of particle residence in the waters of Nusa Penida, Bali. This research was carried out in January 2019, to represent the rainy season conditions, and in July 2019, to represent the dry season conditions. The residence time was calculated using a numerical modeling method namely Finite Volume Coastal Ocean Model (FVCOM). Based on the simulation results, the residence time of particle in the dry and rainy season has a similar pattern. Areas with fast residence times are found in the eastern Nusa Penida waters, while areas with weak residence times are found in the Toyapakeh strait. Generally, Nusa Penida waters have a relatively short residence time, 1- 4 hours.
Pertumbuhan dan Tingkat Kelangsungan Hidup Transplan Karang Lunak Menggunakan Metode Gantung Pada Lokasi Budidaya yang Berbeda I Gusti Ngurah Bagus Sukertha Diputra; I Wayan Nuarsa; Widiastuti Widiastuti
Journal of Marine Research and Technology Vol 4 No 1 (2021): FEBRUARI 2021
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2021.v04.i01.p08

Abstract

Besides the second largest community in the coral reef ecosystem, the attractive shapes and colors of soft corals establish it an export commodity for the marine ornamental aquarium. The transplantation methods in soft coral are limited. Commonly method for soft coral transplantation is attached to the artificial substrate followed by placed at table frame. However, this method is easily covered by algae and costly. One of the alternative methods is vertically hanging that this method commonly applied in hard corals transplantation. This study aimed to examine the average differences of growth rates among different transplanted soft coral species, different location, and the presence of interaction between soft coral species and location towards the difference of growth rates. Moreover, it determined the average survival rates among different transplanted soft coral species at different location. There were three soft coral species, Lobophytum strictum, Sinularia polydactyla and S. asterolobata. They were fragmented at initial size ± 25 cm2, hanging vertically in 1.5 m length, and 0.03 m diameter followed by located inside and outside the Pegametan bay, Sumberkima village, Buleleng Regency. The increased size of each transplanted soft coral species and the number of survivals and environmental parameters were observed every two weeks for 12 weeks. The average in growth rates among species, location, and interaction was analysed using two ways Anova, whereas the survival rates were tested using Log-Rank. Results showed that the average growth rates of transplanted soft coral inside the bay were significantly higher (4.53 cm2) than outside the bay (1.64 cm2). Moreover, the average growth rates of transplanted S. polydactyla were significantly higher than others (5.22 cm2), (respectively; 2.35 cm2 and 1.7 cm2). It was also indicated that different location and species did not differentiate the transplanted soft corals' average growth rate. The survival rates of the transplanted soft corals in different location were not significantly different as well.
Struktur Komunitas dan Bioakumulasi Logam Berat Timbal (Pb) pada Teripang di Pantai Tanjung Benoa, Badung, Bali Kadek Widya Suryaningsih; I Gusti Ngurah Putra Dirgayusa; I Nyoman Giri Putra
Journal of Marine Research and Technology Vol 3 No 2 (2020): AGUSTUS 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2020.v03.i02.p08

Abstract

High shipping activity in Tanjung Benoa beach has caused a strong possibility of heavy metal contamination to the marine ecosystems. Heavy metal in the water will process a deposition which causes an accumulation to the body of marine biotas especially to the filter feeders such as sea cucumber. This research aims to determine the community structure of sea cucumber and to calculate the bioaccumulation of lead (Pb) content in sea cucumber. Sampling activity was conducted at four sites located in Tanjung Benoa, Bali. At each site, a transect method was performed to assess the community structure of sea cucumber like density, diversity, and species composition. Meanwhile, the analysis of heavy metal was conducted by Atomic Absorption Spectrophotometer. In this research, we found 151 sea cucumbers which is come from five species such as Holothuria scabra, H. edulis, Synapta maculata, H. atra, H. leucospilota. The highest level of density was found in site one (0.0104 ind/m2) and the lowest was found in siten four (0.0034 ind/m2). The highest level diversity index was found in site three (0,37) and the lowest was in site two (0,14). The highest level of uniformity index was found in site three (0,21) and the lowest was in site two (0,01). The highest level of dominance index was found in site two (0,94) and the lowest was site three (0,85). The species composition was dominated by S. maculata which is represents 94.03% of the total species found in Tanjung Benoa. The number of bioaccumulation factor (BCF o-s) showed that the accumulation of Pb is categorized as deconcentrator category or low accumulation level since the number of the bioconcentration factor is less than one. While the number of bioconcentration factor (BCFo-w) is categorized as a low category since the number is less than 100. Therefore, it can be concluded that biota which categorized as a filter feeder such as sea cucumbers, can accumulate heavy metal (Pb) indeed with the low accumulation level
Struktur Komunitas Ikan Karang di Area Ponton Quick Silver, Perairan Toyapakeh, Nusa Penida Heru Wicaksono; Elok Faiqoh; I Gusti Ngurah Putra Dirgayusa
Journal of Marine Research and Technology Vol 4 No 1 (2021): FEBRUARI 2021
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2021.v04.i01.p04

Abstract

The availability of coral reefs as habitat is closely related to the exsistence of coral fish resources in the waters. Coral fish resources are very important for tourism, as an object sought after by tourist because of their diverse and charming colors and shapes. Reef fish abundance depends on coral cover. This research was conducted in February 2020. The percentage of coral cover was collected using the Under Water Potography Transect (UPT) method and the visual census method for reef fish communities at five research stations located in the area of the Quick Silver’s pontoon, Toyapakeh, Nusa Penida with area of 20.000 . Based on the results, the diversity index in the first data collection ranged from 3.18-3.76, which means the diversity isin the high category. On the other hand, the diversity index in the second data collections tends to decrease in the range of 2.66-3.40, which means that the diversity is in the medium to high category. The uniformity index for the first and second data collection falls into the category of distressed communities. The dominances index on the two data found inj the low category. From this research, it was also found that the percentage of live coral cover in the area of use of the Quick Silver pontoon ranged from 0.08% to 17.32%, which means that all research stations were classified as bad. These results indicate that the presence of reef fish is not only caused by live corals but also by anthropogenic activities of the pontoon, such as manual feeding by visitors. This condition applies to reef fish with omnivore eating behavior, one of which is the Pomacentridae family of the major fish group. These anthropogenic activities can change the composition of reef fish communities and increase abundance.

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