. La nécessité pour le flux des tampons de végétation [ressource électronique] : que dit la science ? . Zones tampons (gestion de l'écosystème), la qualité de l'eau et l'habitat (écologie) ; diffuser de l'écologie, de l'écologie des zones riveraines. Recommandations scientifiques sur la taille des tampons de végétation d'eau nécessaires pour protéger la qualité de l'eau. Pelouses - avec leurs racines superficielles-ne pas filtrer les polluants de l'eau de manière significative. Ils peuvent également être une source d'engrais et de pesticides, des substances qui ne doivent pas entrer dans les ruisseaux et rivières. Montana Ministère des Ressources naturelles et de conservation bibliothèque. formes d'eau. Comme toutes les formes de nitr

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. The need for stream vegetated buffers [electronic resource] : what does the science say? . Buffer zones (Ecosystem management); Water quality; Habitat (Ecology); Stream ecology; Riparian ecology. Scientific Recommendations on the Size of Stream Vegetated Buffers Needed to Protect Water Quality. Lawns—with their shallow roots—do not significantly filter out water pollutants. They can also be a source of fertilizers and pesticides, substances that should not enter streams and rivers. Montana Dept. of Natural Resources and Conservation photo library. forms of stream life. Like all forms of nitrogen, ammonia can contribute to eutrophication (over- fertilization) of lakes, wetlands, and slow-moving streams {see Nutrients below). Fecal coliform bacteria are found in the fecal material of humans or other animals and are used as an indicator of the likely presence of bacteria and viruses that cause a wide range of diseases. Sources of such bacteria and viruses include leak- ing sewer pipes, sewer overflows, failing septic systems, and areas where concentrations of ani- mals are found, such as animal feedlots, city parks frequented by dogs, and areas with colonial nest- ing birds. The higher the levels of fecal coliform bacteria in water the greater the risk to human health because of the many waterborne patho- genic diseases associated with bodily wastes. Heavy metals, such as lead, mercury, cad- mium, copper, and zinc, occur naturally in streams and soils. However, many human activi- ties increase the movement of these substances from land into water, raising the concentration of these metals to levels that are toxic to aquatic life. At very high levels, such metals may quickly kill aquatic life. Even at fairly low levels, metals may gradually accumulate in the liver or kidneys of animals, causing failure of these organs. The main sources of these contaminants are industrial and consumer waste, including power plant and other industrial emissions, old mining operatio

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