The plant would die, causing the amount of food available to carnivorous mammals to drop. These situations change the entire ecosystem, since predators would begin to die along with their prey. While dams generate clean energy, they also are negatively impacting the ecosystems around them. During their construction, they use land that is essential for humans and animals alike. While they’re operating, many fish have gotten killed, which impacts the animals who feast upon them.
But they also stop the natural migration of fishes, and affect their reproduction and alter the level and quality of water. Some people who live around the river refer to the dams constructions as evil and they say that... ... middle of paper ... ... of the fishermen have moved to Bangkok in look for lower jobs. The study stated that if the Moon project was to be evaluated for construction today it wouldn't be accepted. Thanks to this it is believed that constructions of dams in Thailand wont be accepted for now. A director from Terra, an environmental group, says that this dams are only a threat to the Mekong river.
The dam itself will block the migration of multiple fish species downriver, effecting their spawning and breeding habits. This could create a surplus in fish before the dam, but none further downriver, where other animals that eat the fish will have to compete more for their food ("Environmental"). For instance, a dam going in on the Yangtze River in China will adversely affect over 300 species of fish. "The dam will create a barrier in the river that these species will not be able to cross. Fish will not be able to travel upstream to spawn, so the populations of the species will decrease" (O 'Hara).
Critique of Dams and Disease According to Ziegler et al (2013) building of hydropower dams threatens to decrease species and the amount of freshwater fish in the Mekong River. The article goes on to claim that there will be negative effects on food safety and river health if dams are built that will change the flow of the river. They project that people will be affected in a negative way with just one dam and even more devastation could be faced with the series of dams that is expected to be built in Southeast Asia. One of the concerns is that the current lack of flood control results in a natural flushing of current habitat that occurs with heavy rains. Once dams are built, man will have control over nature and a more evenly water flow decreasing the natural flow of flooding.
Some beaches have eroded to over half of their original size. This erosion is happening because the beaches depended on the annual floods to bring them a continuous supply of fresh, fine sand. The dam is trapping a majority of the sand. There are small tributary rivers that flow uninhibited into the Colorado River below the dam, they bring some sediment - but not enough. As well as these beaches depending on the floods - the rapids in the river, have this same type of dependence.
There are many solutions for the future that could be done. Dams along the Mekong threaten many things on land and in the water. When fish migrate in the Mekong they are mostly anadroumos fish, so they go upstream. Since there are dams all along the river it is hard for these fish to try and go upstream. They cannot go through the dams but if each company invested money on a fish ladder this problem could be solved.
The populations of Chinook salmon have declined for several reasons. Hydropower and it's destructiveness to the environment, pollution, and overfishing are the three main causes for the decline. The Chinook salmon is known for traveling the greatest distance back to its spawning grounds, often traveling one to two thousand miles inland. This long journey is now often interrupted by hydroelectric plants. Hydropower is a very good alternative resource for power, however it is very damaging to our salmon populations.
It was completed in December 2007, one year ah... ... middle of paper ... ...t into the reservoir on average per year, in time, this silt could accumulate behind the walls of the dam, clogging the turbines' entranceway. Further, the absence of silt down stream would have two dramatic effects: ? Some hydrologists think that this could make downstream riverbanks more vulnerable to flooding.  ? The city of Shanghai, more than one thousand miles (1600 km) away from the dam, rests on a massive plain of sediment.
The lake has dropped over 100 feet. Creating this lake made a water mass that was very susceptible to evaporation; it evaporates at a rate of a million and a half acre feet per year. This would be stopped with the draining of the lake, and letting the river be restored to its original state. With the making of the damn, very important fish and plant habitat was destroyed, some of these being important and endangered species. It also prevented the flow of fish to different part of the river, as there are now 11 dams along the rivers.
In addition, the use of huge nets also swept up many non-commercial species or commercial fish so young that they should have been left in the ocean to reproduce. In addition, one-third of the fish caught was actually taken to the market to sell while the rest were dumped (killed). The use of technology killed more fishes than any other centuries of fishing. The use of modern technology was not monitored thus killing more fish. With thousands of fish commercial or not the... ... middle of paper ... ...on dropped from 1,030 in 1991 to 748 in 2006.