Ecology and Competition

What does the Competitive Exclusion Principle state?

• That no two species compete at the same time

• That no two species can share the same niche at the same time

• That no two species can live in the same ecosystem

• That competition excludes certain species

Notice the relationship between the predator (the lynx) and the prey (the hare). Which is true according to the graph?

• These two populations live in different ecosystems.

• When the hare population declines, the lynx population increases.

• When the lynx population declines, the hare population increases.

• The highest lynx population was seen in 1885.

True or False: Predator populations can be impacted by changes in the populations of prey.

• True

• False

How is a niche different from a habitat?

• It is not different; they mean the same thing

• A niche is where an organism lives; a habitat is how they live (behavior)

• A habitat is where an organism lives; a niche is how they live (behavior)

• You find multiple types of habitats inside a single niche

How much energy is lost between trophic levels when on organism eats another?

• 10%

• 25%

• 50%

• 90%

What is at the base of every trophic pyramid?

• Producers

• Decomposers

• Primary Consumers

• Apex Predators