The Biosphere: Change in Ecosystems

The video explores ecological succession, starting with beavers transforming forest ecosystems into ponds, illustrating ecological succession. It then explains primary succession on volcanic islands, where life begins on new land. Secondary succession is shown in forests and fields recovering from disturbances. Finally, climax communities are discussed as stable, mature ecosystems.

What role do beavers play in ecological succession?

• They transform forest ecosystems into ponds and wetlands.

• They prevent ecological succession.

• They destroy ecosystems without any benefits.

• They only live in climax communities.

What is primary succession?

• The replacement of one community by another.

• The final stage of ecological succession.

• The initial colonization of new land by organisms.

• The process of ecosystems recovering after a disturbance.

Which of the following is an example of secondary succession?

• The formation of a new island.

• Plants regrowing after a forest fire.

• Beavers creating a new pond.

• Lichens growing on volcanic rock.

What characterizes a climax community?

• It only consists of pioneer species.

• It is a mature and stable community.

• It is less stable than earlier stages.

• It is the first stage of ecological succession.

Which trees are commonly found in climax communities in New England?

• Cactus plants

• Maple, beech, and oak trees

• Palm trees

• Pine trees