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47.1 Concept of the community
  • Communities are assemblages of interacting populations, which differ in composition and diversity.
  • Environmental factors influence community composition and diversity.
  1. A list of all species found in a community is considered its _______________.
    Answer
  2. What are the two components of community diversity and what do they mean?
    Answer
  3. What explanation for community composition is described by the individualistic model?
    Answer
  4. The model of community structure which predicts that biotic interactions control the occurrence of species and that the same species will always be found together is called ______________________.
    Answer
  5. What does the spatial heterogeneity model predict?
    Answer
Essential Study Partner Summaries of major points
  1. A community is...
  2. Community composition and diversity
  3. Island biogeography
Art Review
47.2 Structure of the community
  • Community organization involves the interactions among species such as competition, predation, parasitism, and mutualism.
  • The ecological niche is the role an organism plays in its community, including its habitat and its interactions with other organisms.
  • Competition leads to resource partitioning, which reduces competition between species.
  • Predation reduces prey population density but can lead to a reduction in predator population density also.
  • There are a number of different kinds of prey defenses, including mimicry.
  • Symbiotic relationships include parasitism, commensalism, and mutualism.
  1. What is a niche?
    Answer
  2. State the competitive exclusion principle and how resource partitioning allows competing species to coexist.
    Answer
  3. Describe the interaction of predator prey population growth curves.
    Answer
  4. __________________ is when one species evolves to resemble another as a way to avoid predation.
    Answer
  5. What are the major types of symbiosis and what is the effect on the organisms involved in each?
    Answer
Essential Study Partner Summaries of major points
  1. Interaction between populations is complex
  2. Habitat and ecological niche
  3. Competition between populations
  4. Predator-prey interactions
  5. Prey defenses and other interactions
  6. Mimicry
  7. Symbiotic relationships
  8. Interactions and co-evolution
Art Review Art Quizzes
47.3 Community development
  • Ecological succession is a change in species composition and community structure and organization over time.
  1. What is succession and what is the difference between primary and secondary succession?
    Answer
  2. What is a climax community?
    Answer
Essential Study Partner Summaries of major points
  1. Communities change...
  2. Ecological succession
Art Review
47.4 Community biodiversity
  • The intermediate disturbance hypothesis suggests that a moderate amount of environmental change leads to a diverse environment, and therefore more biodiversity.
  • Predation and competition can help maintain biodiversity, and island biogeography suggests how to maintain species richness.
  1. What are the three components of community stability?
    Answer
  2. A high degree of diversity can be maintained by moderate sized and moderately frequent disturbances. This idea is known as _____________________.
    Answer
  3. What is a keystone predator and how does it increase the diversity of a community?
    Answer
Essential Study Partner Art Review Lab exercises





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