AP Biology Flashcards: Community Ecology
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 14 cards to help you master important concepts.
What is the fundamental role of interactions among populations regarding resources?
Interactions among populations dictate how they access energy and matter within a community.
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What is the fundamental role of interactions among populations regarding resources?
Interactions among populations dictate how they access energy and matter within a community.
How can the relationships between interacting populations be characterized or modeled?
Relationships between interacting populations can be modeled and are characterized by the positive and negative effects they have on each other.
A scientist observes that the introduction of a new species alters the food web. What fundamental process within the community has been affected?
The way populations access energy and matter within the community has been affected by this new interaction.
Define species diversity.
Species diversity is a key component, along with species composition, used to measure and describe the structure of a community.
What two components are used to measure community structure?
Community structure is measured by its species composition and species diversity.
How do interactions among populations influence a community?
Interactions within and among populations influence the overall community structure and dictate how populations access energy and matter.
Name the three forms of symbiosis mentioned in the text.
The three forms of symbiosis mentioned are parasitism, mutualism, and commensalism.
If a model shows an interaction with a negative effect on both populations involved, what type of interaction is it likely representing?
This model is likely representing competition, where both populations are negatively affected by the interaction.
Define species composition.
Species composition is one of the two key measurements, along with species diversity, that describes the structure of a community.
How is the structure of a community described?
The structure of a community is described according to its species composition and diversity.
What is the relationship between population interactions and community change over time?
Communities are dynamic groups of populations that change over time based on the ongoing interactions among them.
Why are communities considered dynamic?
Communities are dynamic because they are groups of interacting populations that change over time based on their interactions.
List the key types of interactions that drive population dynamics within a community.
Competition, predation, and various forms of symbiosis (parasitism, mutualism, commensalism) drive population dynamics within a community.
What is the primary driver of population dynamics within a community?
Interactions such as competition, predation, and various forms of symbiosis are the primary drivers of population dynamics within a community.