PCB 2033 Chapter 16 Quiz

Which description is true for most communities?

A few species are common and the remainder are rare.

Which statement best describes a keystone species?

A rare or uncommon species that has a strong effect on its community.

The species within a guild are unlikely to interact with one another.

False

Who was Aldo Leopold?

a conservationist

The layer of a forest in which decomposition takes place and mineral nutrients are released for reuse by plants is called the

forest floor.

Which of the following is considered a guild?

insect-feeding birds

Within a food web, herbivores are considered to be

intermediate species.

Which is the most dominant species?

largest in number, most relative biomass, and/or highest in relative abundance

What might be a result of hunting sea otters to extinction for their fur?

loss of kelp beds

Dominant species tend to be more abundant than other species because they

outcompete other species.

The species at the top of the food web

prey on other species and are not subject to predation.

The goal of restoration ecology is to

return the community to its pre-disturbance condition.

Which of the following groups of species represents a guild?

species of birds that feed on nectar

When an ecologist compares the diversity of different communities by counting the number of species within each community, the measure of diversity being used is called

species richness.

A food web is more complicated than a food chain.

True

Among the array of species that make up a community, not all are equally abundant.

True

Dominance is the converse or opposite of diversity.

True

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

True

The organismic concept views communities as clusters of species associating together as an interacting, integrated component.

True

The species within a community interact with one another directly or indirectly.

True