CH 7 Concepts
Community Interactions

Objectives

1. Describe the three characteristics that describe a biological community.

2. Distinguish among the following roles played by species and give one example of each: native species, nonnative species, indicator species, keystone species. Explain why these labels are important.

3. Distinguish among the following species interactions and give one example of each: interspecific competition, predation, and symbiosis. Distinguish between interference competition and exploitation competition. Summarize the competitive exclusion principle. List two strategies species use to reduce competition.

4. List two strategies that predators use to capture their prey. List at least five strategies that prey use to defend themselves against predators.

5. Distinguish among three forms of symbiotic relationships and give one example of each: parasitism, mutualism, and commensalism.

6. Define succession. Distinguish between primary and secondary succession. Describe how humans affect communities.

Key Terms (Terms are listed in the same font style as they appear in the text.)

climax community (p. 158)

commensalism (p. 155)

constancy (p. 158)

ecological succession (p. 155)

foundation species (p. 149)

indicator species (p. 146)

inertia (p. 158)

interspecific competition (p. 150)

keystone species (p. 148)

mutualism (p. 154)

native species (p. 145)

nonnative species (p. 145)

parasitism (p. 153)

persistence (p. 158)

predation (p. 151)

primary succession (p. 155)

resilience (p. 158)

resource partitioning (p. 150)

secondary succession (p. 155)

species diversity (p. 145)

species evenness (p. 145)

species richness (p. 145)