Ecosystem Disruptions and Food Webs Page 1 & 2

What are the four main factors that cause population changes in ecosystems?

• Moving In, Moving Out, Birth Rate, Death Rate

• Weather, Climate, Food, Space

• Predator, Prey, Food, Water

• Energy, Food Web, Predator, Prey

How does the movement of individuals into a population affect its size?

• It increases the population size.

• It decreases the population size.

• It has no effect on the population size.

• It stabilizes the population size.

What happens to energy transfer patterns when population sizes change in a food web?

• They are impacted and can change.

• They remain the same.

• They become more efficient.

• They stop completely.

What was the impact of overhunting sea otters in the 1700s and 1800s?

• Sea otter populations dropped, affecting the entire food web.

• Sea otter populations increased, stabilizing the food web.

• Sea otter populations remained stable, with no impact on the food web.

• Sea otter populations dropped, but the food web was unaffected.

What is the effect of a rising sea urchin population on kelp?

• The kelp population drops sharply.

• The kelp population increases.

• The kelp population remains stable.

• The kelp population is unaffected.

How do changes in birth and death rates usually occur in an ecosystem?

• Due to environmental changes like weather or climate.

• Due to random chance.

• Due to human intervention only.

• Due to genetic mutations.

What happens to predator-prey relationships when there are changes in population?

• They can be disrupted, affecting food sources.

• They remain unchanged.

• They become more balanced.

• They become irrelevant.