BIO 148: Osterhage In-class activity: Trophie cascades Name: Wolves were re-intr
ID: 275978 • Letter: B
Question
BIO 148: Osterhage In-class activity: Trophie cascades Name: Wolves were re-introduced to Yellowstone National Park in 1995. They had been absent from the park for 70 years. 1. What effect would you expect to see on the elk population when wolves were re-introduced? What was actually seen (if different): 2. What effect would you expect the changes in elk behaviors to have on the trees present in different areas? What was actually seen (if different): 3. What effect would you expect on the birds present in the area? What was actually seen (if different) 4. What effect would you expect on the beaver population? Beaver like to cat aspen trees. What was actually seen (if different): 5. What downstream effects (hal) would you expect to see when the number of beaver changes? Hint: Think about frogs, ducks and other organisms that live in freshwater What was actually seen (if different): 6. What effect would the re-introduction of wolves have on the coyote population? What was actually seen (if different) 7. What effect would you expect on the populations of rabbits and mice? What was actually seen (if different): 8. What effect would you expect to see on organisms that eat rabbits and mice (weasels, hawks, etc)? What was actually seen (if different): 9. What effect would you expect to see on scavengers (eagles, etc.) that feed on dead What was actually seen (if different) 10. After wolves were reintroduced, the rivers meandered less and erosion levels decreased. Why do you think this occurred? WOW -TROPHIC CASCADES ARE CRAZExplanation / Answer
Answer
1. the population of elk will reduce as the wolf have direct effect on it.
2. the trees of area will grow as they will not be consumed by elk.
3. Birds population will also grow as the plants growing and elk population is less which feed on plants.
4. Beavers will have ampul amount of food as they feed on plants.
5. When the number of beavers increases the resources for the frogs, insects, will be reduced and vice-versa.
6. Coyote population will decrease as the wolf and coyote have predator and prey relationship.
7. Rabbits and mice populations will increase as their predators will decrease in number due to introduction of wolf.
8. Rabbit and mice eaters will grow in number as they will get sufficient food.
9. Scavengers will get more food in the form of dead elk and coyote and other larger animals.
10. As the trees grow the soil will be bound in roots. a lot of animals population reduces so the water use is less
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