In this module, we saw that interactions among species affect whether a species can persist. Some interactions such as competition, predation, parasitism, and herbivory have negative effects on one or both species. Other interactions such as mutualisms and commensalisms have neutral or positive effects on both species. Keystone species have particularly large effects on a community; they can dramatically alter the habitat, such as when beavers construct dams. In the next module, we will examine how species in communities change over time as a result of changes in the biotic and abiotic environment.
Module 20 AP® Review Questions
212
1. Resource partitioning
occurs in mutualisms.
can occur through morphological differences between competing species.
can cause the extinction of a competing species.
is not the result of behavioral changes.
does not occur among competing predators.
2. The interaction between bees and sunflowers is an example of
predation.
herbivory.
parasitism.
mutualism.
commensalism.
3. Pathogens are a type of
mutualist.
parasite.
predator.
herbivore.
commensalist.
4. Which of the following is NOT typical of a keystone species?
It can shape and maintain habitats for other species.
It can limit a dominant competitive species.
It can have a relatively low abundance.
It is at the top of the food chain.
It is rarely a primary producer.
5. Which interaction harms both species involved?
Competition
Predation
Parasitism
Mutualism
Commensalism