How Wolves Change Rivers Essay

2208 Words Nov 10th, 2014 9 Pages
Tina Teng (10 B)
Science
Mr. Lee
November 13th, 2014
Can Wolves Really Change Rivers?
Wolves can really change rivers. Wolves bring the benefit to the ecosystem by killing and eating other animals. Unfortunately, people realize the fact only until the absence of these apex predators, also known as alpha predators. Apex predators are predators with no natural predators of their own and resides at the top of their food chain. Many people think that predators bring harm to the ecosystem by killing and eating other animals, but they don’t realize the benefit they bring and the harm of the absence of these apex predators. After being absent for over 70 years, the wolves were reintroduced in the Yellowstone National Park in the United States in
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(Wolves- Sustainable man) Since the wolves killed the coyotes, the number of rabbits and mice began to rise. The rise in the number of rabbits and mice meant more hawks, more weasels, more foxes, and more badgers. The population of ravens, bald eagles, and the bears have rised as well since the wolves left some of the carcasses which they could feed on. The bear population also rose because there were more berries growing on the regenerating shrubs and plants. One remarkable thing is that the bears also reinforced the impact of the wolves by killing some of the calves of the deer. (Wolves- Sustainable man)
Most importantly, the wolves changed the behavior of the rivers. All the impact the wolves have made to the ecosystem and the abiotic and biotic factors have a chained of reaction, once the wolves have impacted one species, it will affect the rest of the food chain. The rivers changed because the wolves affected the elk population which then led to the impact on the population of the beavers and the amount of plants and trees. The rivers began to meander less, since the channels narrowed. (Wolves- Sustainable man) There were more pools, more riffle sections, all of which were great for wildlife habitats as these bodies of water support a greater diversity of organisms. The rivers were more fixed in their course as there were less soil erosion since the

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