1) watch the Video: “How wolves change rivers” about wolf reintroduction to Yell
ID: 119813 • Letter: 1
Question
1) watch the Video: “How wolves change rivers” about wolf reintroduction to Yellowstone National Park. https://www.youtube.com/watch?v=ysa5OBhXz-Q
Answer the following questions:
What is trophic cascade?
How did it manifest in this example?
What is ecosystem engineer and what organism was an example for it?
Why did vegetation start to return to valleys and mountain sides along with other organisms?
How did wolves change the abiotic /physical components of the ecosystem? What were these abiotic components?
Explanation / Answer
1. Trophic cascade is an ecological process which starts from top of food chain and ends at the bottom of it.
2. The example is given in the context that when wolfs reintroduction to Yellowstone National Park, it helped in getting the vegetation back as earlier deers were grazing all of the park and now with the reintroduction of wolfs, deers started avoiding certain easily traceable paths like valley and gorges, and in these areas the height of trees increased tremendously in just 6 years, and with this number of birds started moving in, and also number of Beavers started moving in as Beaver like to eat the trees.
3. The example of ecosystem engineer is wolf. Ecosystem engineers are the organisms which create niche for other species, they provide habitat for various other species.
4. Since deers avoided the easily traceable paths like valleys and mountains, trees started growing and attracted various other bird and animal species.
5. With the reintroduction of wolfs vegetation started flourishing. With this now there was no soil erosion on the mountains and river became more fixed in their course and banks stabilized.
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