Browsing by Author "Mahatma, R."

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    KELIMPAHAN ZOOPLANKTON DI PERAIRAN LAUT BANGKA
    (2013-05-24) Firman, S.; Elvyra, R.; Mahatma, R.
    This study aims to determine the abundance of zooplankton which in Bangka Sea Waters. This study is part of a collaboration of the Directorate General of Higher Education (DITJEN DIKTI) of the Ministry of National Education and the Directorate of Institutional Research Center for Oceanography Indonesian Institute of Sciences (P2O-LIPI). Sampling for this study was conducted during the Sailing Nationality for Young Scientists Program (PKIM) Batch II 2010 on boat RV. Baruna Jaya VIII on 22th September - 4 October 2010. Sampling for zooplankton was conducted on 20 stations which were divided into 3 locations: south, east and north. Zooplankton sampling method performed by the method of vertical using Plankton nets (Norpac). The amount of zooplankton which were found in Bangka Sea Waters is 4052 individuals. This consist of 6 phyla (Annelida, Arthropoda, Coelenterata, Chaetognatha, Echinodermata and Mollusca), these 6 phyla contain classes of zooplankton which consisting of Polychaeta, Crustacea, Scypozoa, Sagittoidea, Ophiuroidea, and Gastropoda. The most dominant class zooplankton in Bangka Sea Waters is crustaceans at 86,13 %. Abundance mean of zooplankton in Bangka Sea Waters ranges between 8,583-24,662 ind/m3.
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    MORTALITAS DAN PERTUMBUHAN LARVA NYAMUK Culex sp. AKIBAT PEMBERIAN EKSTRAK KULIT JENGKOL (Archidendron pauciflorum Benth.)
    (2014-03-28) Juwita, E.; Mahatma, R.; Fitmawati
    Culex sp. is a vector of various diseases. Usually Culex sp. is controlled using synthetic insecticides. Synthetic insecticides are considered as an effective, practical, and economical method, but the countinous use of synthetic insecticides cause environmental pollution, death of other living creatures and resistant larvae, as well as negative impact on health and the environment. The efforts to controll Culex sp. have to be done properly and environmental friendly. One of the methods used is jengkol skin extract that contains allelopathy compound which is toxic to insects, therefore it can be used as biological insecticides. The objective of this study was to determine the effect of Jengkol skin extract (Archidendron pauciflorum Benth.) on the mortality and growth of mosquito larvae (Culex sp.). The study was conducted from June to September 2013 in the Laboratory of Zoology and Botany, FMIPA, University of Riau. The mortality data was analyzed using ANOVA, if there was a significant effect of treatment then followed by Duncan's test at the level of 5 %. The growth data was analyzed by using GI (Growth index) formula, RGI (Relative growth index) and phytochemical data of jengkol skin extract was qualitatively analyzed. Results of this study showed that jengkol skin extract gave an effect on the mortality and growth of mosquito larvae, on both preliminary test and mortality test. GI and RGI values decreased in line with the increasing of concentration of the extract. Phytochemical analisys of jengkol skin extract showed that metabolic secondaries found were terpenoid, alkaloid, saponin, flavonoid and tanin