Ecotourism is growing business in Nepal due to domestic and international visitors. Specifically, natural lakes in Ramsar sites are very potential avenues for boating, scenic beauty and study the aquatic ecosystem. However Eichhornia crassipes has been threatening the beauty, ecosystem and eco-tourism business. This research was objectively carried out to explore income generation from ecotouri...

Introduction Thousands of chemical substances, including toxic, persistent, bioaccumulative substances (TPBS), are produced and used world-wide annually 1 . These volatile and semivolatile TPBS may be transported by air both in gaseous phase and adsorbed to atmospheric particles 2 prior to deposition in soil and water. Due to the grasshopper effect, TPBS released may evaporate in warmer climate...

Now a day, riverine system is becoming under pressure due to antibodies interference which highly affect the fauna and flora biodiversity, and economic activities. These antibodies have significantly increased the antibodies resistant microbes present in the aquatic environment which act as reservoirs including rivers, sewage, ocean water and drinking water. Bacterial resistance is the superb e...

Environmental 137Cs adsorbed on fine sediments has many uses as a tracer in erosion and sedimentation studies. The determination of sedimentation rates in lakes and reservoirs using 137Cs as a geochronological marker is described in detail. From a survey of literature sources it is shown that 137Cs levels in soils and sediments can be a powerful tool for the identification and quantification of...

The 48 contiguous United States contain at least 2.6 x 10 small water bodies (> 600-900 m), and possibly as many as 9 x 10 (> 25 m) (Smith et al. 2002). These water bodies are termed ‘small’ not only because of their size distributions, but also to emphasize the distinction between the water bodies discussed here and the much smaller number (a few percent of the total at most) of relatively wel...

Inland waters (lakes, reservoirs, streams, and rivers) are often substantial methane (CH(4)) sources in the terrestrial landscape. They are, however, not yet well integrated in global greenhouse gas (GHG) budgets. Data from 474 freshwater ecosystems and the most recent global water area estimates indicate that freshwaters emit at least 103 teragrams of CH(4) year(-1), corresponding to 0.65 peta...

Abstract Historic land alterations and agricultural intensification have resulted in legacy phosphorus (P) accumulations within lakes reservoirs. Internal loading from such stores can be a major driver of future water quality degradation. Yet, little is known about the magnitude spatial patterns P accumulation lentic systems, how watershed disturbance trajectories drive these patterns. Here, we...

Water surface is one of the most important components for rendering landscapes. The rendered spacious water surface with periodic wavelets such as on the lakes and reservoirs is very easy to make aliasing and/or moiré in the regions far from the viewpoint. In periodic bump mapping on a plane with strong reflection, moiré pattern appears. The reflection rays on the wavelets are scattered by the ...

Water is an essential natural resource, necessary for drinking, agriculture and industrial activities, and providing the human population with safe drinking water is one of the most important issues in public health. Cyanobacteria produce toxins that may present a hazard for drinking water safety. These toxins are structurally diverse and their effects range from liver damage, including liver c...

This is t~e fifth of several compilations of briefing papers on w~ter quahty prepared by the U.S. Geological Survey. Each bne:fing paper is prepared in a simple, nontechnical, easy-tounderstand manner. This U.S. Geological Survey Circular contains three papers on the microbiology of aquatic environment. Briefing papers are included on "The ecological role(s) of aquatic micro-organisms in lakes ...