Competition

Competition

Competition in ecosystems happens when organisms compete for the same limited resources, such as food, water, shelter, or sunlight. Competition can be intraspecific and interspecific. Intraspecific competition happens between members of the same species. For example, two deer competing for territory or mates in the same forest engage in intraspecific competition. Interspecific competition occurs between different species. For instance, lions and hyenas competing for the same prey in the savanna represent interspecific competition.
By studying competition, scientists learn how species interact, how resources shape communities, and how to manage ecosystems for biodiversity and sustainability.

Science and Engineering Practices (SEP): Developing and Using Models

You can learn more about competition by creating models that show how organisms interact when resources are limited. These models help demonstrate how two species might compete for the same food, how overcrowding affects survival, or what happens when one species is removed from an ecosystem. By using models, like diagrams, simulations, or hands-on activities, you can better understand how competition impacts populations and ecosystems over time. Modeling allows you to ask "what if" questions and test predictions about how species respond to changes in their environments.

Activity Ideas:

• Resource Competition Simulation – Use a simple classroom game where students act as animals collecting limited resources (e.g., beans, tokens). Observe how competition affects access and survival.
• Species Interaction Role Play – Act out different roles in an ecosystem (e.g., predator, prey, competitor) and explore how competition changes when one species is added or removed.
• Adaptation Design Challenge – Design a creature with features that would help it compete better in a chosen environment, considering food availability, shelter, and predators.

Crosscutting Concept (CCC): Stability and Change

Competition is a major force that influences both the stability and change in ecosystems. When resources are balanced and competition is limited, populations can remain stable. But when resources become scarce or when new competitors are introduced, ecosystems may shift, leading to changes in population sizes and species survival.

Stability Through Competition:

• Natural levels of competition help regulate population growth, keeping species in balance with their environment.

Change Due to Competitive Pressures:

• If a new species enters an ecosystem or a major resource is lost, competition can intensify, causing shifts in species dominance, possible extinctions, or the evolution of new adaptations.

By studying competition, students gain insight into how ecosystems regulate themselves and how living things interact in ways that promote both cooperation and conflict in nature.