Ecological Niches and Competition

Mr. Anderson discusses the concept of ecological niches, explaining how different species occupy unique roles in an environment. He introduces Hutchinson's n-dimensional hypervolume theory, which describes niches as complex spaces defined by various biotic and abiotic factors. The video differentiates between fundamental and realized niches and explains the competitive exclusion principle, which states that no two species can occupy the same niche simultaneously. A case study from Yellowstone Park illustrates these concepts, showing how the reintroduction of wolves affected coyote and fox populations.

What is the primary role of a niche in an environment?

• To determine the lifespan of a species

• To measure the biodiversity

• To define the role or job of a species

• To calculate the population size

What does the term 'n-dimensional hypervolume' refer to in ecology?

• A measure of the physical space occupied by a species

• A mathematical model for predicting species extinction

• A method for calculating species population growth

• A concept describing the range of conditions a species can tolerate

Which of the following factors can define a niche according to Hutchinson's concept?

• Only biotic factors

• Neither biotic nor abiotic factors

• Only abiotic factors

• Both biotic and abiotic factors

What is a fundamental niche?

• The area where a species is extinct

• The potential area a species could occupy

• The area where a species is endangered

• The actual area a species occupies

How does a realized niche differ from a fundamental niche?

• It is larger than the fundamental niche

• It is the same as the fundamental niche

• It is smaller due to competition

• It is unrelated to the fundamental niche

What does the competitive exclusion principle state?

• Species always compete for the same niche

• Species can share niches if resources are abundant

• Two species cannot occupy the same niche simultaneously

• Two species can coexist in the same niche indefinitely

What happens when two species are complete competitors?

• They coexist peacefully

• One species will eventually outcompete the other

• They merge into a single species

• They both become extinct

What was the impact of reintroducing gray wolves in Yellowstone Park?

• Increased coyote population

• No impact on other species

• Decreased red fox population

• Decreased coyote population

How did the coyote population change after the reintroduction of wolves?

• It became extinct

• It decreased significantly

• It remained stable

• It increased significantly

What adaptation have coyotes shown in response to wolves in Yellowstone?

• They have started living in packs

• They have become smaller

• They have moved to higher altitudes

• They have become larger