Ecological succession notes

What is ecological succession?

The process of change in species structure and ecosystem dynamics over time.

Primary succession

Occurs in lifeless areas where soil has not yet formed, such as after a volcanic eruption.

Secondary succession

Follows disturbances that leave the soil intact, like after a forest fire.

True or false: Succession can only be primary.

False, because it can also be secondary.

Climax community

A stable, mature ecosystem that has reached the final stage of succession.

Pioneer species

The first organisms to colonize an area during primary succession, like lichens.

Difference between primary and secondary succession

Primary begins without soil; secondary starts in areas where soil exists.

What initiates primary succession?

Events like lava flow or glacial retreat create new land.

Fill in the blank: __________ species modify the environment.

Pioneer species.

True or false: Succession only happens after natural disasters.

False, because it can also occur due to human activities.

What is a seral stage?

A transitional stage in ecological succession leading to a climax community.

Examples of disturbances in ecosystems

Fires, floods, storms, and human activities.

What role do herbivores play in succession?

They can help shape plant communities and influence regeneration.

True or false: Climax communities are static.

False, because they can change under new conditions.

What factors influence ecological succession?

Climate, soil type, species interactions, and availability of resources.

Fill in the blank: __________ can hinder or facilitate succession.

Human activities.

True or false: Succession is a linear process.

False, because it can vary based on many ecological factors.

What is a disturbance?

An event that disrupts ecosystem structure, like a fire or flood.