Ecological Succession Concepts

Mr. Andersen explains ecological succession, a process by which ecosystems recover after disturbances. He distinguishes between primary succession, which occurs on bare rock without soil, and secondary succession, where soil remains. Examples include Mount St. Helens and the island of Surtsey for primary succession, and Yellowstone Park for secondary succession. Pioneer species like Lupin and lodgepole pines play a crucial role in secondary succession. The video also discusses climax communities and how disturbances like fires or human activities can restart the succession process.

What is ecological succession?

• A series of events where life returns to an area.

• A method of planting trees.

• A process where ecosystems remain unchanged.

• A sudden change in climate.

What characterizes primary succession?

• It is faster than secondary succession.

• It involves only animal species.

• It happens in areas with no soil.

• It occurs in areas with existing soil.

Which of the following is an example of primary succession?

• A garden being planted in a backyard.

• A city being rebuilt after an earthquake.

• A new island forming from a volcanic eruption.

• A forest regrowing after a fire.

What is secondary succession?

• The initial growth of plants on bare rock.

• The regrowth of an ecosystem where soil remains.

• The process of soil erosion.

• The extinction of species in an area.

Which species are known as pioneer species?

• Species that dominate climax communities.

• Species that first colonize disturbed areas.

• Species that are always present in an ecosystem.

• Species that are resistant to all disturbances.

What role do pioneer species play in succession?

• They cause disturbances in the ecosystem.

• They prevent other species from growing.

• They are the last to arrive in an ecosystem.

• They prepare the environment for other species.

What is a climax community?

• A community that never changes.

• The final, stable community in succession.

• A community that forms after a tsunami.

• The first community to form on bare rock.

How do lodgepole pines adapt to fire disturbances?

• They have seeds that are dispersed by wind.

• They are resistant to fire damage.

• They have cones that open only after a fire.

• They grow only in wet areas.

What happens to an ecosystem after a disturbance?

• It becomes a desert.

• It remains unchanged.

• It undergoes succession to recover.

• It is permanently destroyed.

What is the difference between primary and secondary succession?

• Primary succession involves only animals.

• Primary succession starts without soil, secondary with soil.

• Primary succession is faster than secondary.

• Primary succession occurs with soil, secondary without.