4.2 Niches and Community Interactions WS

What is a niche?

A niche is a full range of of physical and biological conditions in which an organism lives and the way in which the organism uses those conditions.

Give an example of resources a squirrel might need.

A squirrel needs food, water, and a habitat.

Competition between members if the same species is known as interspecific competition. (T/F)

False

The complexity exclusion principle states that no two organisms can occupy exactly the same niche in exactly the same habitat at exactly the same time. (T/F)

False

Three different warbler species live in the same tree. One species feeds at the top of the tree, the second species feeds in the middle part of the tree, and the third species feeds at the bottom of the tree. Do all three species occupy the same niche? Explain.

No, each species has a different niche in the same tree habitat. By being in different areas of the tree, the species avoid competing directly with one another.

Competition occurs when organisms attempt to use the same resources. (T/F)

True

If two species of bacteria are grown into the same culture, one species will always outcompete the other. (T/F)

True

Members of the same species tend to divide resources instead of competing over them. (T/F)

True

mutualism

both species benefit from the relationship

a barnacle living on a whale's skin

commensalism

a keystone species is one that

helps stabilize the populations of the other species in the community

a cow eating grass is an example of

herbivory

a bee eating a flower's nectar and picking up the flower's pollen

mutualism

an aphid providing food to an ant in exchange for protection

mutualism

parasitism

one species benefits and the other is harmed

commensalism

one species benefits and the other is neither helped nor harmed

a tapeworm living in a person's intestines

parasitism

a tick living on the of a deer

parasitism

a lion eating a zebra is an example of

predation