Exam 28: Community Interactions

Two species that have a high degree of niche overlap will

Some toxic animals are brightly colored, as a means of warning others of their danger.

Lichens represent a symbiotic association between a fungus and a plant.

A storm strips an island in Lake Superior down to bare rock. The first organisms to recolonize the island are most likely

Two species of buttercup are found in the same field in South Dakota, but they emerge at different times: One species emerges and flowers in early spring, and the other species does not emerge until late summer, after the first species has set seed. This is an example of

An effective, bright, and very distinct color pattern that a prey species can display suddenly to scare a predator is called

Succession after a catastrophic disturbance such as a volcanic eruption is referred to as_________succession.

The keystone species in the African savanna is the elephant.

Many plants produce chemicals that are used as medicines. For example, the drug digitalis, which stimulates the human heart, is derived from foxglove, a poisonous plant. What advantage does producing toxic compounds have for the plant?

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

In the Australian outback, emus (a relative of the ostrich) feeding in the open brush lands have coloration similar to the surrounding bushes. This is an example of

Mosquitoes are

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

Two weed species live in the same patch of ground. One has deep roots to tap into ground water. The other has broad, shallow roots to take advantage of the frequent light rains that do not penetrate very deeply into the soil. This is an example of_________ .

Parasites act as agents of_________ , leading to changes in the host population that make it more resistant to the parasite.

In most environments, two or more organisms occupy identical niches.

The most common pioneer species are mosses and lichens.

Bison are a_________ species in the prairie, helping to maintain the grasses, opening water holes and wallows, and creating the ecological framework for the prairie ecosystem.

The caterpillar in the illustration displays

A_________ feeds on its host organism, but does not kill it immediately.