英语翻译

英语翻译
A change in the water chemistry due to surface water contamination can negatively affect all levels of an ecosystem.It can impact the health of lower food chain organisms and,consequently,the availability of the food supply up through the food chain.It can also impact the health of wetlands and impair their ability to support healthy ecosystems,control flooding,and filter pollutants from storm water runoff.Contaminated surface water can also affect the health of animals and humans when they drink or bathe in contaminated water or,for aquatic organisms,when they ingest contaminated sediments.One of the major concerns associated with contaminated surface water is the ability of aquatic organisms,like fish,to accumulate and concentrate contaminants in their bodies.When other animals or humans ingest these organisms,they receive a much higher dose of contamination than they would have if they had been directly exposed to the original source of the contamination.