Biotic Factors in Ecosystems

Ecosystems are delicate and can be destabilized by both abiotic and biotic changes. Removing a species can disrupt food chains, while introducing new species can lead to overpopulation and habitat destruction, as seen with rabbits in Australia. New species may also bring diseases, affecting native species. Removing predators can cause prey populations to grow uncontrollably, further impacting the ecosystem. Even small changes can have significant effects over time.

What can happen if a species at the bottom of a food chain goes extinct?

• The food chain becomes stronger.

• The entire food chain may collapse.

• New species will automatically replace it.

• The ecosystem will remain unaffected.

Why did the rabbit population in Australia grow so rapidly?

• They were genetically modified to reproduce quickly.

• They were fed by humans.

• They had no natural predators and favorable conditions.

• They were protected by local laws.

What is a potential consequence of introducing a new species to an ecosystem?

• It will always improve the ecosystem.

• It will only affect plant life.

• It can lead to a decrease in biodiversity.

• It will have no impact on existing species.

How can the removal of a predator affect an ecosystem?

• It will increase the number of predators.

• It will have no effect on the ecosystem.

• It can lead to a decrease in prey species.

• It can cause prey species to multiply uncontrollably.

What is a long-term effect of biotic changes in an ecosystem?

• Gradual tipping of the ecosystem balance.

• Instant collapse of the ecosystem.

• No noticeable changes over time.

• Immediate improvement in ecosystem health.