118 research outputs found

    Effect of bioturbation activites by the grapsid crab (Helice formosensis) on the lipid contents and microbial consortia in tidal flat sediments: fatty acids classes-sources and fate

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    琉球大学21世紀プログラム「サンゴ礁島嶼系の生物多様性の総合解析」平成17年度成果発表会(平成18年3月6日開催) 会場:琉球大学大学会館3階研究報告書http://purl.org/coar/resource_type/c_18w

    Climate Change Increasing Threats on Non-Conserved Mangroves Forests of Micheweni, Zanzibar–Tanzania

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    Overutilization of mangroves has been reported as the factor for mangrove declining across the globe. However, currently, the global climate change has been claimed to pose significant threats to the survival of mangroves. This study analysed the impacts of climatic variability (sea level rise, temperature and precipitation) to the mangroves of Micheweni (non reserve) and Ngezi-Vumawimbi (nature forest reserve). Multi-disciplinary approach was employed to collect information on community perceptions. Secondary time series data of up to 30 years for temperature, rainfall and sea level rise were collected and analysed. Inquiry results on how local communities perceived climate change showed that over 88% of the respondents agreed that there have been changes in climate in their areas, with 64% showing that there are severe impacts to the mangrove ecosystems. The respondents further claimed that there have been frequent saltwater intrusions affecting their agricultural crops and water table. Analysis of climate change parameters showed gradual sea level rise in the past 10 years and significant increase in temperatures in the past 30 years coupled with slight decrease in overall rainfall patterns. These observations could have serious effects on mangroves, particularly those of Micheweni, since the region is notable with high temperature coupled with minimum amount of rainfall per year, and being freely accessible unlike Ngezi. To reduce vulnerability to climate change, it is recommended to establish buffer zones in particular to the non-reserve mangrove forest of Micheweni. Also there is a need for community sensitization on climate change and resource management.Keywords: Climate change; Mangroves; Sea level rise; Temperature; Precipitation

    Effect of fiddler crabs (Ucca spp.) on soil nutrients and mangrove productivity

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    琉球大学21世紀プログラム「サンゴ礁島嶼系の生物多様性の総合解析」平成18年度成果発表会(平成19年3月10日開催) 招待講演会会場:琉球大学50周年記念館1F,ポスター発表会場:琉球大学大学会館3F研究報告書http://purl.org/coar/resource_type/c_18w

    Can a precast pit latrine concrete floor withstand emptying operations? An investigation from Malawi

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    For fecal sludge from households in low- and middle-income countries to be treated offsite it needs to be removed, which can be greatly affected by the pit latrine floor design. However, it is unclear whether precast pit latrine concrete floors (latrine slabs) can withstand emptiers and their equipment. To investigate this issue, 28 prefabricated latrine slabs were purchased in two cities of Malawi. They were first visually evaluated, and then their compression strength was tested. Additionally, each seller was asked a series of questions to better understand their business, training, and construction practices. Results showed that households should perform due diligence to ensure that they are purchasing a safe precast latrine slab. Commonly reported problems included nonstandard reinforcement material and spacing, in addition to slabs that were not thick enough or were not large enough in diameter. The results of this research illustrate the inherent complexity in ensuring high-quality decentralized sanitation solutions and how one component, the user interface, if implemented poorly, can affect the rest of the value chain. The findings from this work can help inform training and initiatives that engage artisans and suppliers who play a role in the provision of onsite sanitation service delivery

    Mangrove litter production and seasonality of dominant species in Zanzibar, Tanzania

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    This study is aimed at examining the litter production and seasonality of Avicennia marina, Bruguiera gymnorhiza, and Rhizophora mucronata. Litter was collected using nylon litter traps of 1 mm2 mesh size in the Uzi-Nyeke mixed mangroves, Zanzibar, over a period of 2 years. Contents were sorted, dried, weighed, and the average daily litter production for each component was calculated. A distinct seasonality and species variation were found in all mangrove litter components. The average annual litterfall rate was higher in B. gymnorhiza, followed by R. mucronata and A. marina (3.0, 2.8, and 2.0 ton dry wt. ha-1year–1 respectively). Leaf fraction was the main component of litter in all species, but fruit and flower for R. mucronata also had a considerable contribution to the total litterfall. The presented patterns of litter production are associated with average temperature and wind speed which are both strongly correlated with litter seasonality. Our data contributes to the body of knowledge on  patterns of litter production and the ecological integrity of mangrove forests in Zanzibar.Keywords: Litterfall, mangrove species, seasonal pattern

    Unpacking changes in mangrove social-ecological systems: lessons from Brazil, Zanzibar, and Vietnam

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    Mangroves provide multiple benefits, from carbon storage and shoreline protection to food and energy for natural resource-dependent coastal communities. However, they are coming under increasing pressure from climate change, coastal development, and aquaculture. There is increasing need to better understand the changes mangroves face and whether these changes differ or are similar in different parts of the world. Using a multiple case study approach, focused on Vietnam, Zanzibar, and Brazil, this research analyzed the drivers, pressures, states, impacts, and responses (DPSIR) of mangrove systems. A qualitative content analysis was used on a purposively sampled document set for each country to identify and collate evidence under each of the DPSIR categories. Population growth and changing political and economic processes were key drivers across the three countries, leading to land use change and declining states of mangroves. This had an impact on the delivery of regulatory and provisioning ecosystem services from mangroves and on the welfare of coastal communities. Responses have been predominantly regulatory and aim to improve mangrove states, but without always considering ecosystem services or the consequences for welfare. The issue of scale emerged as a critical factor with drivers, pressures, impacts, and responses operating at different levels (from international to local), with consequences for response effectiveness

    Antidiabetic effect of Pterocarpus marsupium seed extract in gabapentin induced diabetic rats

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    Background: Type 2 diabetes mellitus is the most common type of diabetes. Diabetes mellitus is a leading cause of morbidity and mortality among Indian population and all over the world with more than hundreds of millions of patients worldwide. Pterocarpus marsupium is a medicinal plant used in Ayurvedic system of medicine to control blood sugar and strong antidiabetic. The purpose of this study was to assess the hypoglycemic effect of the ethanolic extract of Pterocarpus marsupium seeds in diabetic rats.Methods: The present work was designed to evaluate the anti-hyperglycaemic activity of Pterocarpus marsupium seed extract (100 mg/kg and 200 mg/kg) on gabapentin induced hyperglycaemia in wistar albino rats. Blood glucose level, serum triglycerides, total cholesterol, HDL cholesterol and LDL cholesterol were evaluated in gabapentin induced diabetic rats. The results of the test drug were compared with the standard drug.Results: Ethanolic seed extract of Pterocarpus marsupium at 100 mg/kg and 200 mg/kg had significantly reduced the blood glucose level compared to disease control rats on day 1, 7, 14 and 21. Pterocarpus marsupium shows significant decrease in triglycerides levels, serum cholesterol levels, LDL levels and increased HDL levels, total protein levels compared to the disease control group.Conclusions: In conclusion, the present study shows that the ethanolic seed extract of Pterocarpus marsupium has potential antidiabetic action in gabapentin induced diabetic rats and the effect was found to be more similar to the standard drug metformin
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