AP®︎ Biology: Topic 8.5 Flashcards

Master key terms and definitions for Topic 8.5 of AP Biology – Community Ecology to help you prep for quizzes and the AP exam.

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Term

Community

Definition

All interacting populations of different species living in the same area.

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Community
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All interacting populations of different species living in the same area.

8.5.B8.5.B.1
Community Structure
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The organization of species in a community based on composition and diversity.

8.5.A8.5.A.1
Species Composition
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The identity or list of species present in a community.

8.5.A8.5.A.1
Simpson's Diversity Index
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Calculated as 1 - Σ(n/N)^2 to estimate community diversity from richness and evenness.

8.5.A8.5.A.1
Competition
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A minus-minus interaction in which organisms use the same limited resource.

8.5.B8.5.B.4
Niche Partitioning
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Resource use differences that reduce competition and allow species to coexist.

8.5.B8.5.B.3
Cooperation
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Behavior in which organisms work together to improve access to resources or energy.

8.5.B8.5.B.3
Species Diversity, Richness, and Evenness
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Includes the number of species present and how evenly individuals are distributed.

8.5.A8.5.A.1
Predator-Prey Relationships and Trophic Cascades
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Interactions where consumers limit prey populations and can indirectly affect other trophic levels.

8.5.B8.5.B.3
Symbiosis: Mutualism, Commensalism, and Parasitism
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A close interspecific relationship that benefits both, benefits one, or harms a host.

8.5.B8.5.B.4