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Articles by Rashidi Othman
Total Records ( 4 ) for Rashidi Othman
  Rashidi Othman , Nurul Azlen Bt. Hanifah and Ruhul Izzati Shaharuddin
  Over the past decade, ecologists have tried to determine how changes in species composition and diversity affect ecosystem structure and function. Until recently, the majorities of these studies have been conducted in terrestrial ecosystems and have not taken into account environmental variability. Now a days, humans tend to neglect water as part of main sources in our daily life. As time goes by with few exceptions, water has always been a natural resource that people take for granted. The idea of this research is to understand how aquatic plants can be used to detect and act as an indicator for polluted freshwater bodies. In this study, sixteen water samples were collected from four different places (Selangor, Perak, Pahang and Kelantan) where six different aquatic plant species were abundance and dominant. All the water samples were analyzed for six types of heavy metals which are Iron (Fe), Lead (Pb), Copper (Cu), Zinc (Zn) and Nickel (Ni) and Manganese (Mn). All six different aquatic plant species which are Eichhornia crassipes, Hydrilla verticillata, Cabomba fuscata, Salvinia natans, Nelumbo nucifera and Pistia stratiotes exhibiting highly significant differences between aquatic plant species widespread, locations and the heavy metals content. This clearly demonstrates that freshwater environment with abundance of invasive macrophyte species can have an important influence and indication on the accumulation of heavy metals content. The importance of the interaction components emphasises that the changes in heavy metals composition are complex and the responses are not consistent across all aquatic plant species. Examination of the summarised data revealed that of the 6 macrophyte species analysed at all different locations, all exhibits as potential ecological indicator for unhealthy aquatic ecosystems or as phytoindicator for heavy metal contaminants either at low or high level contamination.
  Rashidi Othman , Farah Ayuni Mohd Hatta and Shahima Shafiai
  The disturbance of acid sulfate soils due to poor wastewater management of aquaculture activities caused a major environmental issue such as metal pollution in coastal regions of many countries over the world. Peninsular Malaysia also challenged the same problem where it lost 18700 ha of coastal lowlands from 1980-1990. This activity caused the oxidation of pyrite which produces high concentrations of ferrous ions and sulfuric acid in turn attacks clay minerals and produces high concentrations of monomeric Aluminum (Al) and other acid-soluble metals. Subsequent leaching of these toxic products into adjacent water bodies is rapidly increasing the stress on ecosystems. Therefore, the research was aimed to monitor heavy metal runoff from acid sulfate soil at shrimp aquaculture areas through phytotechnology approach. The study was conducted at fourteen different sites in Selangor which contains large amount of acid sulfate soil. The result showed that Pistia stratiotes was substantially the best phytoindicator for Al, Iron (Fe) and Manganese (Mn) toxicity followed by Lemna minor, Nymphaea stellata and Urticulata aurea. On the other hand, N. stellata was observed to be best phytoindicatorfor Nickel (Ni) whereas for Arsenic (As) was Ludwigia palustris. Among these six species, the most potential biomonitoring agent to indicate acid-soluble metals are P. stratiotes and N. stellataas they are presence in low D.O level, high pH, high concentration of ammonium and tolerance to Al, Fe, Mn and Ni.
  Rashidi Othman , Nur Illani Abdul Razak and Nooriszai Ishak
  This study analyzed the traditional knowledge of plants used in traditional bath which known as mandiserom in Malay culture. Mandiserom is an important traditional way in postpartum practice among Malay communities in Perak and Negeri Sembilan. The study was carried out through face to face interviews with Malay midwives as the respondents and collection and identification of the plants in the area. A total of 25 species of plants were noted and collected during the botanical surveys. Most of them are predominated by zingibers and herbaceous plants. In mandiserom, the plants are used to get rid the body odour for spiritual cleansing, for hygienic purposes and to ward off mystical forces known as makhlukhalus in Malay culture. Traditional beliefs and practices surrounding postpartum practice were highly prevalent among young women in Malay culture. However this traditional knowledge is seldom recorded and only passed down through generations. Therefore these new ethnobotanical records are a rich source towards preservation of traditional knowledge of plants that can be further up for clinical studies in Malaysia.
  Rashidi Othman , Nur Fadhlina Mohd Noor , Khairusy Syakirin Has-Yun Hashim , Maheran Yaman , Fadzidah Abdullah and Suhaili Suid
  Urban parks varies in size ranging from 400-30 000 ha all over the world and one thing in common they possessed is that urban trees play an important role in mitigating the impacts of climate change by sequestering atmospheric carbon dioxide (CO2). Calculation of carbon (C) stored and sequestered by urban trees is the actual and critical assessment of the real potential role of an urban park in reducing atmospheric CO2. This study provides a case study of the quantification of C storage and sequestration by two urban parks with two different landscape setting design in Subang Jaya and Damansara, a rapidly urbanized and populated city in West coast of Malaysia. The C storage or sequestration rate was estimated by biomass equations, using field inventory and analysis survey data. The calculation of biomass provides reasonably accurate estimation of the amount of carbon that was sequestered from trees over the years. The findings revealed that different landscape setting design contribute to marked differences in carbon stored. Curvilinear landscape setting design was found to sequester more carbon compared to informal landscape setting even though total green and built up areas for both sites are similar. These findings provide insights and better understanding of the role of urban park as carbon sink.
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