Here's a breakdown:
* Succession is the gradual process of change in the species structure of an ecological community over time.
* Biotic succession specifically refers to the changes driven by the living organisms within the community.
Here's how biotic components influence succession:
* Pioneer species: The first organisms to colonize a barren area (like lichens on bare rock) alter the environment, creating conditions suitable for other species.
* Competition: As more species arrive, they compete for resources like sunlight, water, and nutrients. This competition can lead to the dominance of certain species and the decline of others.
* Facilitation: Some species may create conditions that benefit other species, like nitrogen-fixing bacteria making the soil more fertile.
* Inhibition: Some species may inhibit the growth of others, like the release of toxins by certain plants.
Example:
Consider a volcanic eruption that creates a new island. The initial colonization by lichens (pioneer species) breaks down rock, creating soil. This allows grasses to establish, which provide habitat for insects and small mammals. Over time, larger plants and animals will arrive, eventually leading to a complex, stable ecosystem.
It's important to remember that both biotic and abiotic factors play a role in succession. The interaction between living organisms and their physical environment shapes the direction and rate of succession.
