Exam 17: Factors Influencing the Structure of Communities

When top-down control occurs within an intertidal zone along the rocky coastline of the Pacific Ocean,which of the following species controls the abundance of other species?

As the fertility of soil on the forest floor increases,the

Patterns of temperature and ________ resulting from regional variations in climate are the major determinant of regional and global patterns of vegetation distribution.

The populations of keystone predators are controlled by the populations of their prey species.

The "world is green" hypothesis suggests that herbivore populations limit the number of predators,allowing plant biomass to accumulate.

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

Which of the following organisms have benefited from wolf reintroduction?

What is the term when one species benefits from an indirect interaction and the other has a neutral effect?

Food webs are typically arranged into trophic levels with

Why might increased nutrient availability result in increased species diversity in aquatic systems while it results in decreases in terrestrial systems?

The diversity of an animal community is unrelated to the physical structure of a plant community.

Why might biologists assemble species into functional groups when examining community structure?

This figure suggests that adding more and more nutrients over time will result in

Variation in environmental conditions within a community is referred to as environmental ________.

Which of the following is an example of a fundamental niche?

Spartina alterniflora allocates more ________ to outcompete Juncus gerardi.

The removal of a single species from a community can have unpredictable consequences.

Diffuse interactions often occur among competing species but never among predator-prey species.

Plant community structure along an environmental gradient can often be explained by

When interspecific interactions involve more than just two species,they are said to be ________.