Time filter

Source Type

Agency: Cordis | Branch: FP7 | Program: CP-SICA | Phase: ENV.2007.;ENV.2007. | Award Amount: 1.91M | Year: 2009

Project partner will complete a detailed multidisciplinary situation analysis of highland aquatic resources, focused on values, livelihoods, conservation issues and wise-use options at five sites in Asia (Guangdong, China; Uttrakhand and West Bengal, India and northern and central Vietnam). Factors assessed will include biodiversity and ecosystem services, including provisioning, regulating, supporting and cultural services. Livelihood strategies of households dependent on ecosystem services derived from highland aquatic resources, in particular poor, food-insecure and vulnerable people, will be assessed within a sustainable livelihoods framework and opportunities to enhance such livelihoods assessed. Institutional features, including local, national and international policy and legislation, trajectories of change, stakeholder values associated with highland aquatic resources and areas of conflict will be assessed. Stakeholder participation will be critical to ensure new knowledge is accessible for collective decision-making and development of policies for the equitable use and conservation; methods and indicators for participatory monitoring and evaluation of ecosystem services and biodiversity will be developed. Action plans will then be formulated with stakeholders to: monitor the health of highland aquatic resources; develop and promote wise-use, and where necessary livelihoods diversification, to enhance poor livelihoods and conservation; integrate sustainable and wise-use, livelihoods diversification and conservation with watershed management priorities throughout the region. Action plans will be implemented by stakeholders at four sites displaying high biodiversity in Asia and the ecosystem, livelihoods and institutional impacts assessed through participatory monitoring and evaluation. Best practices aimed at conserving biodiversity and sustaining ecosystem services will be communicated to potential users to promote uptake and enhanced policy formulation.

Bishnu A.,Institute of Environmental Studies and Wetland Management | Chakraborty A.,Bidhan Chandra Krishi Viswavidyalaya | Chakrabarti K.,University of Calcutta | Saha T.,Institute of Environmental Studies and Wetland Management
Biology and Fertility of Soils | Year: 2012

Ethion, a highly persistent insecticide in soil, is extensively used in tea cultivation in the tropics. The studies on the environmental impact of ethion in tea soil ecosystems are scanty. Silty loam and sandy loam soils from tea fields of Dooars (Typic Uderthents) and Hill (Typic Dystrudepts), respectively, were investigated for the degradation and effect of ethion application on soil microbial and biochemical variables under controlled laboratory conditions. Ethion degraded faster in the Hill soil than in the Dooars soil. Higher temperature (30°C) aided in faster degradation due to the increased microbial activity in the soils. Ethion application at field rate (FR) had lower half-lives (70 days at 20°C and 42.3 days at 30°C for Dooars soil; 65.4 days at 20°C and 39 days at 30°C for Hill soil) than at ten times FR (10FR; 75.2 days at 20°C and 44.2 days at 30°C for Dooars soil; 70 days at 20°C and 41.8 days at 30°C for Hill soil). Soil microbial biomass carbon, ergosterol content, fluorescein diacetate hydrolyzing and β-glucosidase activities declined in all the treatment combinations up to day 60 for both FR and 10FR doses at 20°C, irrespective of the soil types. At 30°C, the decreasing trend was observed up to day 30 for both the soils. The toxicological effect of ethion on microbiological and biochemical parameters persisted till their corresponding half-lives. The microbial metabolic quotient and microbial respiration quotient were altered, but was short-lived, indicating ethion induced disturbances. The recovery of the depressive action at 10FR ethion spiking on the studied variables was of slightly longer duration than noticed at FR application, although the depressive effect was overcoming after the respective half-lives of ethion. The microbial and biochemical soil parameters were negatively correlated with application of ethion up to day 60 of incubation. © 2011 Springer-Verlag. Source

Chaudhuri K.,Institute of Environmental Studies and Wetland Management | Manna S.,Institute of Environmental Studies and Wetland Management | Sarma K.S.,Institute of Environmental Studies and Wetland Management | Naskar P.,Institute of Environmental Studies and Wetland Management | And 2 more authors.
Aquatic Biosystems | Year: 2012

Background: Sundarbans is the single largest deltaic mangrove forest in the world, formed at estuarine phase of the Ganges - Brahmaputra river system. Primary productivity of marine and coastal phytoplankton contributes to 15% of global oceanic production. But unfortunately estuarine dynamics of tropical and subtropical estuaries have not yet received proper attention in spite of the fact that they experience considerable anthropogenic interventions and a baseline data is required for any future comparison. This study is an endeavor to this end to estimate the primary productivity (gross and net), community respiration and nitrification rates in different rivers and tidal creeks around Jharkhali island, a part of Sundarbans estuary surrounded by the mangrove forest during a period of three years starting from November'08 to October'11.Results: Various physical and chemical parameters of water column like pH, temperature, conductivity, dissolved oxygen, turbidity, suspended particulate matter, secchi disc index, tidal fluctuation and tidal current velocity, standing crop and nutrients were measured along with water column productivity. Relationship of net water column productivity with algal biomass (standing crop), nutrient loading and turbidity were determined experimentally. Correlations of bacterial abundance with community respiration and nitrification rates were also explored. Annual integrated phytoplankton production rate of this tidal estuary was estimated to be 151.07 gC m-2 y-1. Gross primary productivity showed marked inter annual variation being lowest in monsoon and highest in postmonsoon period.Conclusion: Average primary production was a function of nutrient loading and light penetration in the water column. High aquatic turbidity, conductivity and suspended particulate matter were the limiting factors to attenuate light penetration with negative influence on primary production. Community respiration and nitrification rates of the estuary were influenced by the bacterial abundance. The estuary was phosphorus limited in postmonsoon whereas nitrogen-limited in premonsoon and monsoon period. High algal biomass and primary productivity indicated the estuary to be in eutrophic state in most of the time throughout the year. Our study also indicated a seasonal shifting between autotrophic and heterotrophic conditions in Sundarban estuarine ecosystem and it is a tropical, well mixed (high tidal influx) and marine dominated (no fresh water connection) system. © 2012 Chaudhuri et al.; licensee BioMed Central Ltd. Source

Ghosh S.,University of Calcutta | Chatterjee T.,Institute of Environmental Studies and Wetland Management | Saha T.,Institute of Environmental Studies and Wetland Management | Mukherjee A.,University of Calcutta
Nucleus (India) | Year: 2012

The study deals with the genotoxicity of soil samples collected from locations near a thermal power plant in the eastern parts of India. The metal content in the soil samples collected near the thermal power plant, fly ash pond and ash dumping sites were higher than the control sample. Physicochemical parameters such as pH, bulk density, water holding capacity and soil texture did not show much difference between the reference soil and the contaminated soils. Comet assay was carried in pot experiments utilizing Allium bulbs. The results of DNA damage as a reference to the genotoxicity of the soil were positive and could be correlated to the presence of the toxic metal content. The damage was high in the sites located near the ash pond and the ash dumping sites. The root growth was also inhibited in the fly ash contaminated soils. The bioassay data in combination with the physico-chemical analyses will be useful in the management and disposal practices of fly ash and can be undertaken to minimize the adverse impact on agricultural land. © Archana Sharma Foundation of Calcutta 2012. Source

Bhattacharyya S.,Institute of Environmental Studies and Wetland Management | Pethick J.,The World Bank | Sarma K.S.,Institute of Environmental Studies and Wetland Management
Water Policy | Year: 2013

Tidal estuaries constrained by embankments in the Sundarbans have failed to respond to a >1 m sea level rise over the past 100 years since their construction. This paper shows that this has led to a disequilibrium morphology leading to channel erosion that has undermined embankments, causing mass failure, breaching and subsequent flooding during surge events. Predicted future sea level rise will exacerbate this trend and managed realignment of embankments will be needed to accommodate it. Management practices have, however, modified this underlying process of erosion. The increasing practice of severing tributary channels from the main channel using flap sluices to create freshwater storage ponds has, in many cases, reduced tidal flow in the main channels so that they are not only accreting rather than eroding, but capable of accommodating future sea level rise without erosion. In contrast, the rapid spread of salt water aquaculture in the Sundarbans, flooding previous paddy land, has led to an increase in tidal discharge and accelerated erosion of the embankments in estuary channels conveying water to the ponds. This paper concludes that existing management practices may have a more significant impact on flooding in the Sundarban than the predicted sea level rise due to global warming. © IWA Publishing 2013. Source

Discover hidden collaborations