Browsing by Author "Felix, Feliatra"

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    Decomposition Rate of Mangrove Litter in Kuala Indragiri Coastal
    (2016-08-28) Mariana, Mariana; Felix, Feliatra; Sukendi, Sukendi; Nasution, Syafruddin
    This study was conducted in the mangrove forest located in the Kuala Indragiri coastal areas (Riau province–Indonesia) from January to February 2015. Mangrove litter leaf is organic substance that affects the fertility of mangrove ecosystem, and support the life of organisms within that forest. The mangrove represent as nursery ground, feeding ground, and spawning ground for various fish type, prawn and other marine organisms. This forest is also produce detritus that can be used as main foods source in marine ecosystem. The objectives of this research is to understand the decomposition rate of mangrove litter in the Kuala Indragiri mangrove forest. Data were analyzed by calculating the mean dry weight of the litter and decomposition rate was counted using an exponential rank function or absolute decomposition percentage of litter leaf per day. The highest rate of litter decomposition was found in station V 44.902% with a residence time 15, 930 days. The mean coefficient of litter decomposition rate was 0.058 with residence time 19, 571 days.
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    Estimation of Mangrove Forest’s Carbon Stock in Kuala Indragiri Coastal Riau Province – Indonesia
    (2017-10-01) Mariana; Felix, Feliatra; Sukendi, Sukendi; Nasution, Syafrudin
    Mangrove forest act as natural carbon stores, but the carbon will release if the trees were felled and the area were deforested. The amount of carbon stored within an area are varies according to the type of the vegetations, so it is need to develop the low carbon stock areas. Mangrove is one of the ecosystem’s key in climate changes as the carbon’s storage. Most of areas in Kuala Indragiri are low-lying areas (93.31%), such as, regional stream sediment, peat swamp areas with soil (peat), brackish forest areas (mangrove). Some of the area approximately 0-3 meters above sea level. The research design is the explorative research, by using nested quadrate method. There are 5 locations of carbon stocks sampling in Kuala Indragiri coastal: Sapat as station 1, Tanjung Lajau as station 2, Tanjung Melayu as station 3, Sei Bela as station 4 and Sei Buluh as station 5. Each station has three line transects consisting three plots of each transect. The total plots are 45 in each determined mangroves land. The methods followed the procedures developed by the Center for International Forestry Research (CIFOR) for mangrove forests. Based on the finding, mangrove vegetation in the Kuala Indragiri coastal consisted of fourteen species. In this study, the researcher developed a general allometric equation to estimate the individual tree biomass and soil carbon content. The finding showed that the estimation of the carbon stock in the whole mangrove forest in Kuala Indragiri coastal: the average ground mass C stocks at each observed station were estimated to be 767.28 ton/ha (trees strata), 92.84 ton/ha (belta strata) and average soil carbon at each station to be 492 ton/ha respectively. estimation of mangrove forest’s carbon stock at above ground biomass and soil biomass in Kuala Indragiri coastal Riau province – Indonesia totally to be 1.352,31 Ton/Ha.
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    Molecular Characteristics Of Vibrio Sp Causing Black Tiger Prawn (Penaeus Monodon) Disease In Sumatra And Java Shrimp Ponds By 16s Rdna Sequencing
    (2016-04-04) Felix, Feliatra; Nugroho, Titania; Silalahi, Sila; Octavia, Yuslina
    Shrimp disease caused by Vibrio sp is one of the main limiting factors in the increasing production in shrimp farming. This disease may kill the shrimp and cause high loss in shrimp culture in South East and East Asia. Samples of ten (10) individual of a ten months cultured giant tiger prawn as well as liter pond water and sea waters were collected from shrimp ponds in Bengkalis Island, Sumatra. Samples of shrimps were also collected from Jepara shrimp ponds in Central Java and they were selected by looking at their behaviour and unhealthy physical characteristics. Amplification, sequencing and bioinformatics analysis of 16S rDNA to identify Vibrio species were conducted in Biotech Center, BPPT Serpong Banten. The results of DNA sequencing of each bacteria isolate were compared to DNA sequences from GenBank, the international DNA bank database. Tracing were made by BLAST (Basic Local Alignment Search Tool) system accessed through the internet at http://www./ncbi.nlm.nih.gov/blast. The result of this study found that of seven strains of Vibrio sp. Bacteria analyzed, five were 97% homologues to V. alginolyticus, V. parahaemolyticus, V. harveyi, V. shilonii and V. vulnificus. Meanwhile, another two strains isolated in this study were not found to be homologues to any of the Gen-Bank listed strain and therefore are considered as indigenous Vibrio sp bacteria from Indonesia.