Ecosystems and Their Dynamics

Mr. Andersen discusses ecosystems, focusing on the Greater Yellowstone Ecosystem. He explains the components of ecosystems, including biotic and abiotic factors, and introduces primary productivity, which measures biomass production by producers. The video covers food chains and webs, detailing trophic levels and the flow of energy. Population growth is explored, highlighting exponential and logistic growth patterns. The impact of human activities on ecosystems, such as climate change, is also discussed, emphasizing the delicate balance within ecosystems.

What is the primary reason Yellowstone Park was originally established?

• To protect geothermal features

• To study grizzly bears

• To promote tourism

• To conserve wildlife

What does primary productivity measure in an ecosystem?

• The biomass produced by producers

• The amount of energy consumed

• The diversity of food chains

• The number of species present

Which of the following best describes a food web?

• A linear sequence of organisms

• A diagram showing only producers and consumers

• A complex network of interconnected food chains

• A single path of energy flow

What is the term for the maximum population size an ecosystem can support?

• Trophic level

• Carrying capacity

• Exponential growth

• Primary productivity

What was the effect of reintroducing wolves into Yellowstone Park?

• Increased elk population

• Decreased biodiversity

• Increased competition among predators

• Stabilized wolf population

How does logistic growth differ from exponential growth?

• Logistic growth has no limiting factors

• Exponential growth reaches a carrying capacity

• Logistic growth accounts for resource limitations

• Exponential growth is slower

What is a significant consequence of global warming on the whitebark pine?

• Decline in population

• Resistance to pests

• Expansion to lower altitudes

• Increased growth rate

Which animal relies on whitebark pine nuts as a food source before hibernation?

• Elk

• Moose

• Grizzly bears

• Wolves

What role do squirrels play in the whitebark pine ecosystem?

• Competitors with wolves

• Distributors of pine nuts

• Predators of grizzly bears

• Pollinators of pine trees

How does climate change affect the food chain involving whitebark pine?

• It increases the availability of pine nuts

• It disrupts the food supply for grizzly bears

• It enhances the growth of whitebark pine

• It stabilizes the ecosystem