Population Dynamics and Ecosystem Interactions

The video is a review session covering key concepts from the week's lessons on populations and resources. It discusses direct and indirect effects, competition, and food webs using simulators. The video also explores evidence and claims related to population changes, focusing on a fictional ecosystem to analyze population dynamics.

What is the primary difference between a consumer population and a resource population?

• Resource populations are always smaller.

• Consumer populations are always larger.

• Resource populations eat, while consumer populations are eaten.

• Consumer populations eat, while resource populations are eaten.

In the jellyfish population explosion example, what was the indirect effect observed?

• Jellyfish decreased, leading to more sardines.

• Sardines decreased, leading to more zooplankton for jellyfish.

• Sardines directly ate jellyfish.

• Jellyfish directly ate sardines.

What was the primary cause of the jellyfish population spike?

• Increase in algae population.

• Decrease in sardine population.

• Decrease in zooplankton population.

• Increase in sardine population.

What role does the simulator play in understanding population dynamics?

• It only focuses on predator-prey relationships.

• It eliminates the need for real-world data.

• It predicts future population sizes.

• It shows relationships between different organisms.

What is a direct effect in a food web?

• A change in one population affects another directly.

• A change in one population affects another indirectly.

• A change in one population has no effect on others.

• A change in one population affects all others equally.

Which claim was ruled out regarding the moon jelly population increase?

• The size of the orca population changed.

• The size of the walleye pollock population changed.

• The size of the sea turtle population changed.

• The size of the algae population changed.

What is the significance of energy storage molecules in population dynamics?

• They determine the lifespan of organisms.

• They are irrelevant to population changes.

• They only affect predator populations.

• They are used to reproduce and sustain populations.

What is the primary focus of the fictional island ecosystem in chapter 4?

• The introduction of new species to the island.

• The population dynamics of the orange-bellied parrot.

• The role of human intervention in ecosystems.

• The impact of climate change on ecosystems.

How does a decrease in button grass affect the orange-bellied parrot population?

• It increases their birth rate.

• It decreases their energy storage.

• It has no effect on their population.

• It increases their lifespan.

What is the main reason for the decline in the orange-bellied parrot population?

• Increase in predators like feral cats.

• Decrease in mushroom population.

• Increase in button grass.

• Decrease in sparrow population.