Exam 19: Community Succession　

In the Sonoran Desert of Arizona, young saguaro cacti often begin life in the shade of mesquite trees; they usually die if they begin life in out in the open. This is an example of

In fire-maintained climax communities in the southeastern United States, periodic fires

What are the characteristics of plants found immediately after a drought in a pond?

Discuss how the classic explanation of lake/pond succession differs from the new model proposed in 2012.

Which of the following is NOT an example of inhibition?

Electrical companies have discovered that dense shrub thickets, once established, can prevent growth of trees under power lines. Which mechanism of succession are these companies using by planting shrubs under power lines?

Plants _____ should be used for initial seeding of abandoned strip mines.

Legumes contain nitrogen-fixing bacteria in their roots that increase soil nitrogen for use by other species. This is an example of

Which of the following is a pioneer species?

Which of the following is NOT an example of a habitat that could undergo primary succession?

Early-succession species are likely to have

(Figure 19.16) This figure shows the importance of different tree species in the canopy and understory of a forest. Why did the researchers who conducted this study suggest that the future canopy will have fewer oaks and hickories?

What causes variation in climax communities over space?

Typical colonizers in primary succession are mosses and lichens that inhabit bare rock. What colonizers in primary succession do not inhabit bare rock?

What characteristic shared by diatoms and cyanobacteria might make them good colonizers of nutrient-poor habitats?

Describe the difference in seed strategy between early successional and late successional plants.

Why does secondary succession occur faster than primary succession?

Why must oxygen concentrations remain at low levels for pond succession to occur?

Experimental removal of a single species in succession would

When seeds of early- and late-succession species were raised under low light conditions similar to those found in the understory of a mature forest, researchers found that species with _____ seeds had _____ seedling survivorship in shade.