Facts and Information on Fresh Water Ecosystems

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1. Compare and contrast the main types of freshwater ecosystems. Name and describe the major zones or a typical pond or lake. There are two main types of freshwater ecosystems, those that are eutrophic, and oligotrophic. Both share the same salinity, yet oligotrophic lakes contain more oxygen than fish. On the flipside, eutrophic ecosystems have more fish than oxygen, which has more cyanobacteria and require less oxygen. The ecosystems have similar food chains, yet they differ on oxygen resources, thus making species differ from eutrophic and oligotrophic ecosystems. Ponds would be eutrophic, and lakes would be oligotrophic from the fish. Ponds not having a cycle of water flowing differentiates them from each other. 2. Describe three benefits of damming rivers, and three costs. What environmental, health, and social concerns has China's three gorges dam raised? Many cities rely on reservoirs for their source of drinkable water. Also, Energy production from dams have the potential to large amounts of electrical energy and profit. Flooding precautions are beneficial due to any amount of water can be controlled by a spillway. Source of usable water by using reservoirs for their source of fresh water. From China’s Three Gorges Dam, there has been many social and environmental concerns. After completion of the dam in 2008, there was an increase in landslides that affected all three of the concerns above. Human, Animal and Nature has been drastically changed after the dam

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