Exam 27: Community Interactions

Competition between the members of two species is:

The keystone species in the African savanna is the elephant. True or False?

Predation is similar to ________ in that both types of relationship benefit one of the interacting species while harming the other.

After forest harvest in an old-growth forest of the Oregon Cascades, an ecologist noted that the species that were present after 5 years differed from the species that were present 25 year later, and these differed from the species that were present 75 years later. What are the general characteristics of the species at each stage, and why does the community change over time?

In all symbiotic relationships, both species involved benefit from the association. True or False?

Sap-feeding insects that feed on plants without consuming them completely may be classified as:

Shade-tolerant plant species are generally found early in succession and are replaced by hardier, shade-intolerant species. True or False?

When all vegetation is removed from a site by human activity or by natural forces such as volcanic activity, ________ species are the first to recolonize the site.

If you find a brightly colored insect resting on a dead leaf, the insect is likely to:

Kudzu, a leguminous vine native to Japan, is considered an exotic invader in the United States but not in its native habitat. In many parts of the United States, kudzu is rapidly expanding and outcompeting native species. Why might this be so?

After a forested area such as a national forest is clear-cut, what type of succession occurs?

What ecological process changes a lake to a marsh over a long period of time?

A predator lures its prey nearby by looking like the prey's favorite food. This is referred to as ________.

Lichens are a symbiosis between a fungus and a plant. True or False?

In his study of the foraging behavior of bumblebees, D. W. Inouye noted that both Bombus appositus and Bombus flavifrons feed from both larkspur and monkshood flowers when each is the only bumblebee species present. However, when both species are present, B. appositus feeds on only larkspur and B. flavifrons specializes on monkshood. This behavior is an example of:

-In the illustration above, the shrubby blueberry and juniper are classified as a ________ community.

What happens to the soil in an area as succession proceeds?

The concept that two species cannot occupy the same ecological niche simultaneously and continuously is called:

The bright coloration of toxic tree frogs is an example of ________.

A keystone species is the most numerous species in an ecosystem. True or False?