180 likes | 264 Views
Ecosystems. Limiting Factors. 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…. Soon….. . We’d be over-run with mice on the planet!!. Why doesn’t this occur?. Limiting Factors.
E N D
Ecosystems Limiting Factors
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….
Soon….. • We’d be over-run with mice on the planet!! Why doesn’t this occur?
Limiting Factors • A limiting factor is an abiotic or biotic factor that restricts the number of individuals in a population.
Limiting Factors • Limiting factors can include: • Competitors
Limiting Factors • Limiting factors can include: • Competitors • Disease and parasites
Limiting Factors • Limiting factors can include: • Competitors • Disease and parasites • Weather
Limiting Factors • Limiting factors can include: • Competitors • Disease and parasites • Weather • Fires
Limiting Factors • Limiting factors can include: • Competitors • Disease and parasites • Weather • Fires • Available habitat
Limiting Factors • Limiting factors can include: • Competitors • Disease and parasites • Weather • Fires • Available habitat • Predators
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
Disease and Parasites • Diseases and parasites can be dependent on population size and habitat
Weather • Storms • Drought • Flooding • Heat/cold
Fires • Fires lead to succession which is a predictable change in the community over time.
Available Habitat • Human activities play a large role • Development, damming rivers, clear cutting forests.
Predators • Predator-prey relationship can be a delicate balance between the two populations.
Predators • As the prey population increases, the predator population increases. As the prey population decreases, then so does the predator population.