Exam 20: Communities of Organisms

The sea star Pisaster ochraceus is a keystone species.Ten years after P.ochraceus is removed from selected intertidal communities along the Washington coast,how might those communities compare to control communities?

Communities change with respect to several timescales.An example of long-term change would be the

In comparing the two communities shown below,community

Identify a single food chain within the diagram below by indicating the organism at each level from producer to primary consumer,secondary consumer,and tertiary consumer.

Pathogens are considered a special type of parasite because they

Which of the following can occur when the climate of an area changes?

Which of the following would probably NOT occur if a single species was removed from an ecological community?

Ecological communities

Provide an example of primary succession.

Study the food web shown below.What would be a reasonable outcome following the complete disappearance of wolves?

Which of the following could represent the linear flow of energy within a food web?

Predators CANNOT

Which of the following statements represents a mutualistic relationship?

Every healthy human digestive system is home to countless microorganisms.In a normal digestive system,what type of relationship would this be considered?

Once a climax community develops,is it likely to remain that way indefinitely?

Does the diagram below represent a food web or a food chain? Identify which organism(s)in the diagram occupy the following roles: producers,primary consumers,secondary consumers,tertiary consumers,and quaternary consumers.

The figure shown below illustrates how,although pines first established themselves as the dominant tree in the Lake Michigan sand dune community,black oaks ultimately become the dominant species.What best explains the gradual reduction of the pine?

Using the data in the infographic below,illustrate how removal of a keystone species such as the wolves from Yellowstone can lead to secondary succession and eventually restoration of a climax community.

The total number of different species living within a community is referred to as

Which of the following statements about communities is true?