Log inSign up for FREE
Library

OpenScied Deer: Predation or Starvation

Last updated over 1 year ago
12 questions
The graph shows the population of deer and wolves on a remote island. The deer lived on the island without predators. Biologist feared that the deer population was growing too much and that deer would die of starvation and disease. In 1971, wolves were introduced (or brought to the island) in hopes of controlling the deer population.
1

What happened to the deer population (blue line) from 1971 to 1973?

1

Populations increase when

1

What happened to the deer population (blue line) from 1975 to 1977?

1

Explain one reason or situation that would lead to a decrease in the deer population.

1

What happened to the deer population from 1977 to 1980?

1

What happened to the wolf population (orange line) from 1971 to 1975?

1

Explain one situation/reason that lead to an increase in the wolf population

1

What happened to the wolf population from 1975 to 1978?

1

What happened to the wolf population from 1978 to 1980?

1

What is the carrying capacity?

1

What happens when a population reaches carrying capacity?

2

In 1970 there was about 2000 deers on an island. Although the island had excellent vegetation for feeding, the food supply obviously had limits. Thus biologist feared that overgrazing might lead to mass starvation. Since the area was too remote for hunters, biologist decided to bring in natural predators to control the deer population. It was hoped that natural predation would keep the deer population from becoming too large and also increase the deer quality (or health), as predators often eliminate the weaker members of the herd.

Do you think the deer on the island would be better off, worse off, or about the same without the wolves. Explain your position. (1 to 2 sentences)