Populations in Ecosystems- Succession Flashcards
What does it mean that ecosystems are dynamic?
They are constantly changing
What is succession?
The process by which an ecosystem changes over time
What is primary succession?
Happens on land that’s been newly formed or exposed
What is secondary succession?
Happens on land that’s been cleared of all plants but the soil remains
When does primary succession start?
When species colonise a new land surface
What are the first species to colonise the area called?
Pioneer species
Why do only the pioneer species grow?
The abiotic conditions are harsh and pioneer species are specially adapted to cope with the harsh conditions
How is a basic soil formed?
The abiotic conditions are changed by the pioneer species- they die and microorganisms decompose the dead organic material
What happens when a basic soil is formed?
Conditions are made less hostile
How may some species change the environment?
So that it becomes less suitable for the previous species
What are the pioneer species in secondary succession?
Larger plants
Which species becomes the dominant species in the ecosystem?
Plants and animals that are better adapted for the improved conditions
What happens as succession goes on?
The ecosystem becomes more complex and biodiversity increases
What is the final stage of succession called?
Climax community
What is the climax community?
The ecosystem is supporting the largest and most complex community it can
