Competitive Outcomes
Competitive Outcomes is a Grade 7 science concept from Amplify Science (California) Chapter 3: Indirect Effects in Ecosystems, explaining how competing species have inversely linked population fortunes. When one competitor declines, it consumes less of the shared resource, leaving more available for the other competitor whose population can then increase.
Key Concepts
In a competitive relationship, the fortunes of the species are often inverse. A change in the size of one competing population causes an indirect change in the other.
If one competitor declines, it eats less food. This leaves more resources available for the second competitor, allowing it to increase.
Common Questions
What happens to competing species when one declines?
When one competitor declines, it consumes less of the shared resource. This leaves more available for the other competitor, whose population can then increase due to the improved food supply.
Why do competing species often have inversely linked populations?
Competitors share a limited resource. When one species thrives and consumes more, less is left for the other, which suppresses it. When one declines, the other benefits from the increased resource availability.
Is the effect between competitors direct or indirect?
The effect is indirect. The competing species do not interact with each other directly — they interact through their shared resource. The food supply acts as the intermediary linking their population changes.
What do Grade 7 students learn about competitive outcomes in Amplify Science?
In Chapter 3 of Amplify Science California Grade 7, students analyze competing species in the Glacier Sea food web and learn that competitors are indirectly linked through shared resources, with one species decline often benefiting the other.