Change in populations

Question 1

What 4 factors affect population size?

Answer 1

1. Birth rate
2. Death rate
3. Immigration
4. Emmigration

Question 2

Think about how the environment impacted the Monarch butterfly population in both the winter habitat and the summer habitat.

Answer 2

Winter:
* habitat loss
* deforestation and urban dev.

Summer:
* less resources for monarchs when they arrive and for reproduction.
* feed almost exclusively on milkweed

Question 3

Why might it be important to protect the migration habitats for migrating animals?

Answer 3

It’s important to protect these habitats, otherwise many populations of animals wouldn’t have anywhere else to survive on until they return; they’ll die.

Question 4

Specifically thinking about the Monarch butterflies, how did the population stay relatively stable despite the catastrophic event in the late winter/early spring in their winter habitat location?

Answer 4

Increase of milkweed growth caused a boom in monarch butterflies’ population during the summer.

Question 5

What kinds of factors can cause habitat loss for animals?

Answer 5

1. Humans
2. Natural disasters

Question 6

Is it true that chemicals, like pesticides, only impact the organisms that are directly sprayed?

Answer 6

No. Once in the air, pesticides can move to water bodies, non-target organisms, nearby crops, or soil. This can cause direct or indirect damage.