Beyond Predator and Prey
Beyond predator and prey, ecosystems contain indirect effects where one population can influence another through intermediate species in the food web, even without directly eating it. In Amplify Science (California) Grade 7, Chapter 3: Indirect Effects in Ecosystems, students learn that a change in one population can ripple through the web to affect non-adjacent populations.
Key Concepts
In a food web, connections are not always direct. The size of a population can be affected by other populations it does not eat or gets eaten by.
These are called indirect effects . A change in one population can ripple through the web to affect a non adjacent population.
Common Questions
What are indirect effects in an ecosystem?
Indirect effects occur when one population affects another without directly eating it or being eaten by it. For example, if a predator eats an herbivore, the plant population that the herbivore ate may grow because fewer herbivores are consuming it.
How do indirect effects differ from direct predator-prey relationships?
A direct effect is when a predator eats prey. An indirect effect occurs when a change ripples through the food web—for example, when reducing one predator population allows its prey to grow, which then depletes another species the prey eats.
Why are indirect effects important for understanding ecosystems?
Indirect effects explain why removing or adding a single species can have far-reaching consequences throughout an entire ecosystem, not just on its direct predators or prey.
Where are indirect effects in ecosystems taught in Amplify Science Grade 7?
Indirect effects in ecosystems are covered in Amplify Science (California) Grade 7, Chapter 3: Indirect Effects in Ecosystems.