Subsurface Ocean Characteristic in the Mentawai Waters during Monsoon Transition Phase on Last 2020

The Indonesia Continental Shelf (LKI) expedition was held during September - October 2020. During the survey, there were ten Conductivity Temperature Depth (CTD) measurement stations that located extending from the west of Mentawai Island to the Indian Ocean. In this study, two-line of subsurface temperature, salinity, and density data were plotted longitudinally. The results show the unique feature between the open ocean and coastal area, the characteristic from open ocean did not affect the characteristic in coastal zone, it is shown from the salinity data. The maximum salinity found in the thermocline layer, between 100-150 m in both of line. The salinity increases from the surface until the thermocline, then slightly decreases to the deep layer. The surface salinity in the coastal area significantly different from the open ocean, it is less than 34 PSU. That is the fact that Wyrtki Jet current did not induce the open ocean water to the coastal water in the subsurface. Otherwise, the temperature and density have a similar pattern with range values around 9-31°C.

PERBANDINGAN POLA BENTUK SIDIK BIBIR ANTARA SUKU ASLI MENTAWAI DAN SUKU CAMPURAN MENTAWAI

One of studies that plays a role in human identification in disaster and crime is forensic odontology. There are several methods of identification in forensic odontology, one of the alternative methods is cheiloscopy which is used to identify lip print pattern. Lip print pattern is identical in each person, lip print can identify gender and human race. Mentawai ethnic is a part of Proto-Melayu race which dominates Mentawai island district area. Familial relationship in Mentawai ethnic is patrilineal the tribe is derived from father’s tribe. This study aimed to compare the shape of lip print pattern between Mentawai original ethnic and Mentawai mixed ethnic. This study is a descriptive study with cross-sectional approach. The samples in this study were 16 pairs of Mentawai ethnic and 16 pairs of mixed Mentawai ethnic, the sample were selected using purposive sampling method. Lip print in study models were marked using colour pen, and the shape pattern of lip prints were observed and measured according to Suzuki and Tsuchihashi classification. Results of this study showed that there are differences in the pattern of lip prints between Mentawai ethnic and mixed Mentawai ethnic. Mentawai ethnic has dominan type of lip prints is type I, type II, and type IV while mixed Mentawai ethnic has dominan type of lip prints is type IV, type I, dan type III. The conclusion is there is a difference pattern of lip prints due to racial factors.

Techno-economic-enviro optimization analysis of diesel/PV/wind with pumped hydro storage for Mentawai Island microgrid

This paper presents a techno-economic analysis and environment assessment of hybrid photovoltaic (PV), wind turbine (WT), and diesel genset (DG) with pumped hydro storage (PHS) for a rural microgrid system. The analysis is carried out for a case study with Mentawai community load demand of 165.44 kWh/day at a peak load of 20.46 kW. The Homer simulation results show that there are eight feasible configurations, which the optimal hybrid system configuration to supply community load is the configuration with PV/DG/PHS. An optimal system has been achieved for the lowest NPC of Indonesian rupiah (IDR) 3,00 B consist of 15 kWp PV modules, 1 unit of PHS and a solar inverter with a size 25 kW. The net present cost and payback period are in accordance with criteria for the economic feasibility analysis method of a project. However, the cost of energy is greater than the electrical utility tariff, but this value can be considered for applications in the remote island area. Therefore, the project still feasible to be implemented. Since the renewable fraction of the system is increased hence this proposed system will have the lowest carbon emission.

Analysis of an Off-grid PV System for Disaster Mitigation Scheme in Remote Areas

The main objective of this paper is to present the techno-economic analysis of an off-grid Photovoltaic system, which prepared to support disaster mitigation scheme in remote areas. As a case study, a regency in Mentawai Island, Sumatera Barat is chosen to represent a remote area in a disaster-prone location. The proposed system capacity is 20 kWp PV system as a single electricity source for medical facility in the island. As a tool in this study, RETScreen software was used to analyze the technical, environmental, and economical feasibility analysis. As a base case scenario, the medical facility was supported by a diesel-fueled generator and the PV system can deliver 10.14 MWh of electricity to load annually. Net annual GHG emission reduction of the system is 19.4 ton of CO2 equivalent. With the total initial cost for the whole PV system at USD 41,380, RETScreen simulation result showed that the equity payback of the project is 6.0 years with IRR of 11.9% hence the project is financially viable.

Shear Wave Splitting Analysis Beneath Sumatra For-Arc Inferred from Broadband Seismic Network Station

The observation of broadband network seismic had been deployed in Sumatra For-Arc. The waveform data for this study were recorded from January 2014 – December 2016. The earthquake event data were selected with the epicenter of around 950 – 1800 in distance and Magnitude with more than 7 Mw. In this case, we use shear wave splitting to determine an anisotropic structure in Sumatra For-arc. Seismic Anisotropy can perform as a tool to classify and observe anisotropic structures of subsurface deformation processes beneath Sumatra For-Arc. The valid outcomes, in this case, have been gained that they only correspond to the upper layer, which has the delay time duration of 0.5 – 0.8 s is the anisotropic layer located in the Mentawai Island. The fast an anisotropic polarization direction found in Sumatra For-arc are parted into NE-SW direction found on the upper layer.

POLA GANTI RUGI LAHAN DALAM PEMBANGUNAN JALAN BARAMBANG TAMAIRANG DESA MUARA SIKABALUAN KABUPATEN KEPULAUAN MENTAWAI

This research is motivated by the construction of the Barambang Tamairang road, Muara Sikabaluan Village, which was built in 2015 and approximately 6 km. Road measurements to be made for the construction of roads on agricultural land owned by the community with an agreement will be compensated for the community’s land with an agreement during a meeting at the village hall. The problem in the construction of the Barambang Tamairang road is that not all compensation has been resolved by the government. The purpose og this study is how the pattern of land compensation of the Barambang Tamairang road, Muara Sikabaluan Village, Mentawai Island Regency. The theory used in this research is the Exchange theory put forward by Peter Michael Blau. The method used in this study is a qualitative approach with a descriptive type to describe the problem under study. Retrieval of informant by purposive sampling with a total of 12 informant. There are two types of data in this study, namely primary data and secondary data. The research data was collected using observation, interview, and document study techniques. Data analysis was performed by collecting data, reducing data, presenting data and drawing conclusions with this research unit’s analysis group. Based on the results of research conducted, found in the process og land compensation in the construction of the Barambang Tamairang road, Muara Sikabaluan Village, Mentawai Island Regency: (1) Deliberation of Consensus, (2) Pattern of money compensation.

Profiling Local Business Enterprises and Direct Effect of Tourism in Villages of Muntei, Madobag and Matotonan, South Siberut, Mentawai, Indonesia

Mentawai is well known as an ecotourism area in Indonesia, with its Siberut National Park recognized as part of the World Network of Biosphere Reserves. People come to visit this exotic area every year to do activities and enjoying the natural surroundings. Tourist visits to Mentawai were escalating by years, both domestic and foreign tourists. Regional income from tourism was also increasing. Ecotourism is known worldwide for its benefit for economic contribution to local communities and poverty alleviation. The economic contribution of ecotourism is often appreciated through its direct effect on local business enterprises on sites. However, statistics today showed that Mentawai are still categorized as underdeveloped and poor. Therefore, this descriptive research objective was to assess tourism contribution by means of direct effect to local business enterprises and challenges faced by villages near Siberut National Park, South Siberut, Mentawai. A survey was conducted in November 2018 by distributing questionnaires to 19 representatives of tourism-related Local Business Enterprises (LBEs) using an accidental sampling technique. Data collected were then processed, analyzed and interpreted. In conclusion, this study shows that there is a low direct effect of tourism to the existing Local Business Enterprise in the villages of Muntei, Madobag, and Matotonan of South Siberut, Mentawai Island Regency, West Sumatera, Indonesia. In addition, essential challenges exist, not to mention managerial, predominantly concerning financial and legal matters. It is recommended that local government and other stakeholders put more consideration not only on environmental and social aspects, but also economy, represented by local business enterprises. Initiatives and integrated actions should be arranged and put in practice as empowering tourism, particularly ecotourism to its optimum, to bring about foremost contribution to local economy through direct effect of tourism to local business enterprises. Keywords: Tourism contribution, Direct effect of tourism, Local Business Enterprise, Ecotourism, Mentawai

Genetic characterization based on the D-loop MtDNA and the TSPY genes of the Dwarf Siamang (Hylobates klossii) of Mentawai Island, Indonesia

Hasanah R, Saepuloh U, Perwitasari-Farajallah D, Sinaga W, Hastuti Y, Sajuthi D. 2020. Genetic characterization based on the D-loop MtDNA and the TSPY genes of the Dwarf Siamang (Hylobates klossii) of Mentawai Island, Indonesia. Biodiversitas 21: 2854-2861. Hylobates klossii is an endemic primate on the Mentawai Island, Indonesia that categorized as endangered species due to fragmentation, illegal hunting, and habitat loss. This study aimed to analyze the genetic characterization of H. klossii based on maternal and paternal lineages. The samples were collected from TSI (Bogor, Indonesia) cage consist of two males and two females (blood and fecal of four individuals) and Siberut Island, Mentawai, West Sumatra, Indonesia from one unknown gender (one individual fecal sample). PCR amplification was carried out on DNA and cDNA samples using specific primers for D-loop MtDNA and TSPY genes. The amplicon was analyzed with MEGA-7. The dimensional structure model of the TSPY protein was determined using I-TASSER and visualized with PyMol. The maternal analysis showed five samples consisted of four haplotypes revealed that Nam-nam and April were identic with 0% genetic distance. It’s revealed that Nam-nam and April were mother and son. The paternal analysis of two H. klossii males revealed that April was the closest relative to H. muelleri (99.56% identity) and Gou-gou to H. klossii (100% identity). Characterization of partial TSPY gene (990 bp) of April and Gou-Gou indicated four amino acids mutation, causing the shift in-amino acid structure position. The results assumed that April was a cross-breeding between H. klossii female and H. muelleri male. This genetic characterization is expected to support the conservation efforts through recommendations for good management in H. klossii preservation.