Yulius
@brin.go.id
Pusat Riset Konservasi Sumberdaya Laut dan Perairan Darat
EDUCATION
Master Degree: S2 FPIK Institut Pertanian Bogor (IPB)
Bachelor Degree: S1 FMIPA Universitas Indonesia (UI)
RESEARCH INTERESTS
Marine Tourism, Coastal Zone Management, Marine Conservation,GIS, Remote Sensing
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Taslim Arifin, Syahrial Nur Amri, Rinny Rahmania, Yulius, Muhammad Ramdhan, Handy Chandra, Luky Adrianto, Dietriech Geoffrey Bengen, Fery Kurniawan, and Rahmat Kurnia
Elsevier BV
Didik Wahju Hendro Tjahjo, Ngurah Nyoman Wiadnyana, Sri Endah Purnamaningtyas, Taslim Arifin, Yulius Yulius, Dini Purbani, Amran Ronny Syam, Mujiyanto Mujiyanto, and Ulung Jantama Wisha
Wydawnictwo Naukowe Gabriel Borowski (WNGB)
Due to rapid urban development in the coastal area of the East Aceh Regency, water quality degradation and marine pollution issues become the primary concern in this region. Moreover, seasonal observation of water quality and phytoplankton has yet to be assessed. This study aimed to determine the control of seasonal water quality and nutrients over phytoplankton abundance throughout the East Aceh coast. Direct field measurements and labora - tory analyses were performed to collect the primary data, whereby the sampling period was conducted during the displacement toward the ebb tide. We assessed the water quality parameters using a modified CWQI (coastal water quality index). Furthermore, linear regression and principal component analysis were performed as the basis of statistical analyses. The phytoplankton abundance was higher in April than in September, with most Bacillariophy-ceae and Dinophyceae in all observed stations. Except for DO and turbidity, the assessed water quality parameters (temperature, TDS, conductivity, salinity, sulfide, and TOM) are feasible for marine biota. Of particular concern, the East Aceh coast is characterized by poor-good water quality, with the CWQI value ranging from 40 to 90. Based on the regression and PCA analyses, N and P nutrients significantly control the phytoplankton abundance like a “seesaw” between April and September, with a respective coefficient determination of about 50%. Because of the tremendously high phosphate observed in April, the water condition tended to be P-limited and vice versa for September. On the other hand, instead of evoking the phytoplankton growth, each water quality parameter has a specific influence in characterizing phytoplankton communities in the study area.
O Johan, E Mustikasari, A Heriati, M. Ramdhan, T Arifin, Yulius, and H L Salim
IOP Publishing
Abstract The western area of Lombok Island is a tourist area that has rich underwater biodiversity in coral reefs ecosystem because of the flow path of Indonesia Trough Flow which carries nutrients continuously through the Lombok Strait. Damage that occurs around the Western area of Lombok Island is caused by climate change and community waste disposal activities that cause coral bleaching. An increase of 1.23°C Sea Surface Temperature occurred in Sekotong on February 2016 and leads to the coral bleaching event on the area. The research was conducted by using the underwater photo transect method and the photos processed by CPCe program shows mass coral bleaching impacted coral condition in West Lombok. Live coral cover was decreased 2.74% comparing with last live coral cover. Total colonies were impacted by coral bleaching 40.04% in Gili Tangkong and 43.63% in Gili Asahan. This Study shows that each species survives and be able to be broodstock for the next life of corals in these areas.
H Fihrin, T Arifin, R Hidayat, R Rahmania, Yulius, D Gunawan, and M Ramdhan
IOP Publishing
Abstract Around 20 percent of coral reef coverage and its high biodiversity in Spermonde Island has been declining in the last 12 years, where the dominant loss is the hard coral. However, only few studies use multi-scale accuracy methods to estimate the loss of hard corals in Kapoposang Marine Tourism Park. Hence, this study aims to map and analyze the dynamics of coral reef covers in Kapoposang Marine Tourism Park of Spermonde Islands for the past two decades (from 2000 to 2019). Data was obtained from the coral reef survey, to validate the Landsat imageries (TM dan ETM+), which were acquired and selected based on similar tides conditions. Gap fills on Landsat ETM+ are managed using Frame and Fill software, then analyzed using Lyzenga algorithm and validated with ground truth data. This study reveals that the coral reef coverage in Kapoposang Marine Tourism Park increased about 9,61% from 2000 to 2015, then declined about 7,41% from 2015 to 2019.
Yulius Yulius, Vaninda Aidina, Muhammad Ramdhan, and August Daulat
EDP Sciences
The fishing ground is identical and closely related to chlorophyll-a abundance in the waters, associated with its fisheries potential. This research has been conducted to determine the concentration and distribution of chlorophyll-a in the seas, especially in the Fisheries Management Area (FMA) 712 encompassing the Java Sea. The analysis used monthly time-series data collected from the satellite imagery over the last 11 years, taken through the ERDDAP website. The mean concentration of chlorophyll-a in the study area was 1.13 mg/l in June 2013. Based on 11 years of data processing, it can be concluded that the highest concentration of chlorophyll-a occurred in the west monsoon season from November to April, where increased rainfall caused the nutrient wash from terrestrial to the open waters. The lowest chlorophyll-a concentration happened in the east monsoon season from April to November, where the dry season arrived. The existence of pelagic fishes in FMA 712, such as Sardinella Lemurs and Sardinella Fimbriata, in waters highly influenced by the chlorophyll-a concentration, while Thunnus Sp. and Exocoetidae Sp. not affected significantly to the existence of chlorophyll-a concentration and its distribution.
R Rahmania, A Setiawan, A Tussadiah, P D Kusumaningrum, Yulius, J Prihantono, B G Gautama, W S Pranowo, Aisyah, A W Nugraha,et al.
IOP Publishing
Abstract Banten Bay is a 150 km2 sea area which includes the waterfront of Serang City in Banten Province, Indonesia with several large rivers flowing into the Bay. The rapid development of industrial and commerce surrounds this bay added with population growth in Serang City have caused environmental problems. For instance, there has been a surge in the volume of domestic and industrial waste that has been dumped along several rivers and finally leaked into Banten Bay. This study aimed to spatially visualize the existing waste flow from residential area to the location of landfills in order to assist the local government in evaluating their waste management system, and to help prevent the waste leaking into Banten Bay and even further beyond. By using hydrodynamic modelling and ground truthing, we can predict the potential waste hotspots and the seasonal patterns of marine debris around Banten Bay and its surroundings. The results show that plastic litter originating from the Cibanten River will drift to the west during the east monsoon and will move to the east during the west monsoon. Based on this evidence, plastic litter from the Cibanten River estuary has the potential to spread further towards the Sunda Strait during the east monsoon and into Jakarta Bay during the west monsoon. We encourage cooperation among local governments in Banten and West Java throughout the watershed as well as with the Jakarta Provincial Government to establish an integrated waste management system to prevent the waste leakage.
T Arifin, R Rahmania, Yulius, D P Gunawan, N A Setyawidati, N Gusmawati, and M Ramadhan
IOP Publishing
Abstract Coral reefs in Kapoposang Islands have been degraded for years due to environmental pressures and human activities. After designated as marine protected area (MPA), coral reefs conditions (e.g. living coral coverage - both hard and soft corals) were monitored regularly since 2015 by several agencies. This study aims to evaluate the effectiveness of MPA management in Kapoposang by analyzing changes of coral reef coverage in its two core zones. The survey was conducted in July 2019 using Line Intercept Transect (LIT), video transect, and satellite imagery analysis, then compared to data from the previous assessment. Results of recent survey, i.e.: living coral reefs coverage ranged from 46.73% - 73.08%; 21 genera found with 10 dominant genera, which Porites sp., is a resistant coral genus and the most dominant genus in Kapoposang MPA; the highest coral recruitment was found in Suranti island at a depth of 10 meters, while the lowest is in Papandangan island; several genera in the form of recruitment (e.g. Acropora sp., Goniopora sp., Fungia sp., Favona sp., and Porites sp.); percentage of macroalgae is 2.95% of total coral reef substrate cover; the most densely macroalgae coverage is found in Suranti, while the lowest is in Kapoposang island.
R Rahmania, T L Kepel, T Arifin, and Yulius
IOP Publishing
Abstract Indonesia has lost 30% of the area over the past two decades due to anthropogenic activities. To overcome this problem, mangrove rehabilitation-which is generally interpreted as mangrove planting program - become the most popular option. These efforts could enhance the quantitative function (increasing mangrove areas extent and number of trees planted), yet the quality functions (biodiversity and ecological function) remain unclear. This analysis was carried out simultaneously with medium to high-resolution satellite image analysis to differentiate mangrove canopy pattern of these sites. The results showed that beta diversity value of mangroves in rehabilitation sites was lower than mangroves in natural area, which was characterized in satellite imagery as more uniform canopy and finer texture. Rehabilitation efforts that are mostly done through monoculture, are unable to produce an equal mangrove ecosystem function as natural mangroves do. This paper aims to examine the effectiveness of rehabilitation efforts whether they can develop an equal ecological function as good as natural mangrove ecosystem, by comparing the difference of beta diversity in two study sites which representing the natural (north Sulawesi) and rehabilitated mangrove (West Bali).
Erni Kusumawati, Setyo Budi Susilo, and Syamsul Bahri Agus
Institut Pertanian Bogor
Chlorophyll-a is a parameter that can determine the primary productivity in the coastal and ocean. Chlorophyll-a is pigment in phytoplankton that used in photosynthesis. Chlorophyll-a concentration can be detected by ocean color remote sensing by using a mathematical model of satellite image data. The purpose of this research is to modify the algorithm of chlorophyll-a concentration of Landsat OLI 8 Satellite Image data and to show the spatial and temporal distribution of chlorophyll-a concentration. The determination of the algorithm is done using a simple linear regression analysis model between ratio of satellite image band data and value of chlorophyll-a in situ data. The algorithm result is C = 0.416 (green / blue) - 0.183 with R² = 0.785 where C is chlorophyll-a concentration (in mg/m3). Using this algorithm, the spatial distribution of surface concentration of chlorophyll-a can be drawn. Based on analysis of primary productivity that potential of fish resources in the Saleh Bay is 1 327 199.83 ton/years.