Ecosystem Succession and Species Adaptation

The video explores changes in ecosystems, focusing on dispersal, exotic species, and ecosystem stability. It explains primary and secondary succession, highlighting how new species can alter ecosystems. The concept of climax communities is introduced, showing how ecosystems reach equilibrium. Assignments include creating a Venn diagram and reading about Mount St. Helens.

What is dispersal in the context of ecosystems?

• The process of organisms moving away from their current location

• The stability of an ecosystem over time

• The introduction of new species by humans

• The replacement of one community by another

Which of the following is an example of an adaptation that favors dispersal?

• Deep roots in plants

• Planktonic larvae in aquatic animals

• Brightly colored flowers

• Thick bark on trees

What is an exotic species?

• A native species that has adapted to a new environment

• A species that has gone extinct

• A species that is found only in tropical regions

• A species introduced by humans to a new area

How can the introduction of exotic species affect an ecosystem?

• It can increase the biodiversity without any negative effects

• It can cause a shift in resources and interactions among organisms

• It always leads to the extinction of native species

• It has no impact on the ecosystem

What is succession in an ecosystem?

• The stability of an ecosystem over time

• The dispersal of organisms to new areas

• The introduction of new species by humans

• The process of one community replacing another

In primary succession, what is the first type of life to appear on bare rock?

• Large trees

• Moss and lichen

• Grasses and shrubs

• Insects and small animals

What distinguishes primary succession from secondary succession?

• Primary succession occurs in areas with existing soil

• Secondary succession occurs in areas where no life existed before

• Primary succession starts on bare rock without soil

• Secondary succession involves the introduction of exotic species

What typically initiates secondary succession?

• The introduction of exotic species

• A disturbance such as a forest fire

• The growth of large trees

• The formation of new soil

What is a climax community?

• A community in the early stages of succession

• A community that has reached a stable equilibrium

• A community that is constantly changing

• A community dominated by exotic species

In a climax community, what happens when an old tree dies?

• A new species quickly takes its place

• The community becomes unstable

• The area remains barren

• A young tree of the same species grows in its place