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Understanding Ecosystems: Limiting Factors in Population Growth

Explore how abiotic and biotic factors, such as competitors, disease, weather, fires, habitat availability, and predators, keep animal populations in check in ecosystems. Learn about the delicate balance between predator and prey populations.

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Understanding Ecosystems: Limiting Factors in Population Growth

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  1. Ecosystems Limiting Factors

  2. Let’s suppose…. • We have two mice…: and they produce the standard 56 “pups” (baby mice) each year. and each of these mice goes on to have 56 babies each year….

  3. Soon….. • We’d be over-run with mice on the planet!! Why doesn’t this occur?

  4. Limiting Factors • A limiting factor is an abiotic or biotic factor that restricts the number of individuals in a population.

  5. Limiting Factors • Limiting factors can include: • Competitors

  6. Limiting Factors • Limiting factors can include: • Competitors • Disease and parasites

  7. Limiting Factors • Limiting factors can include: • Competitors • Disease and parasites • Weather

  8. Limiting Factors • Limiting factors can include: • Competitors • Disease and parasites • Weather • Fires

  9. Limiting Factors • Limiting factors can include: • Competitors • Disease and parasites • Weather • Fires • Available habitat

  10. Limiting Factors • Limiting factors can include: • Competitors • Disease and parasites • Weather • Fires • Available habitat • Predators

  11. Competitors-organisms both cooperate and compete • Birds of prey • Live in forests on the edge of fields • Eat mice and other rodents • Nest in trees Red-Tailed Hawk Barred Owl

  12. Disease and Parasites • Diseases and parasites can be dependent on population size and habitat

  13. Weather • Storms • Drought • Flooding • Heat/cold

  14. Fires • Fires lead to succession which is a predictable change in the community over time.

  15. Available Habitat • Human activities play a large role • Development, damming rivers, clear cutting forests.

  16. Predators • Predator-prey relationship can be a delicate balance between the two populations.

  17. Predators • As the prey population increases, the predator population increases. As the prey population decreases, then so does the predator population.

  18. Example: Lynx and Hare:

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