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Exam 16: Community Structure

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Question 1

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Indirect interactions occur when

A) one species is influenced by interactions with many species.
B) one species does not interact with a second species but influences a third species, which interacts directly with the second.
C) a prey species is controlled by a predator species.
D) a predator species is controlled by a prey species.

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Question 2

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The physical structure of terrestrial communities is usually defined more by the plants than the animals present.

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Question 3

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The ________ concept suggests that, if a cluster of species repeatedly co-exist, they function as an integrated unit within the community.

The layer of a forest that contains tall shrubs, small trees, and young trees is called the

A diagram that describes the interactions between species within a community, focusing on which species eat which other species, is called a

There is considerable evidence that community structure is influenced by species interactions.

In a forest community, the site where decomposition occurs and decaying organic matter releases nutrients for reuse by plants is called the forest ________.

Explain why defining the boundaries of a community can sometimes be very difficult. Do you think this detracts from the usefulness of the concept of community?

Within a community, a group of species that carry out similar functions or exploit the same resource is called a(n)________.

When a single or few species are most prevalent in a community, the species are called ________.

The species diversity of a community is defined by both the number of species and the evenness of the species' relative abundances.

A species that has a disproportionate effect on other species in its community relative to its abundance is referred to as a keystone species.

Defining boundaries between communities is generally

The group of species that occupies a given area is called a(n)________.

Ecologists have a variety of useful sampling and statistical techniques for delineating and classifying communities.

Basal species in a food web do not feed on other species.

Food webs are useful for depicting ________ interactions among species in which the interaction between two species is mediated by an intermediate species.

Why is it important to know the species composition along with species richness, when comparing communities?

Food ________ are diagrams of communities that depict the trophic relationships among species.

The control of an herbivore population by a parasitoid is an example of top-down control.