Biodiversity, Ecosystem Services, and Conservation
This topic tests genetic, species, and ecosystem biodiversity; ecological tolerance; island biogeography; ecosystem resilience; disruptions; and conservation strategies.
How to study for AP Environmental Science
Build every answer from the environmental system first: identify the process, interpret the data, perform the calculation, and justify a solution with tradeoffs.
Core concepts
Concept 1
Biodiversity questions often connect diversity to stability, resilience, and ecosystem services.
Exam cue: Decide whether the issue is genetic, species, or ecosystem diversity.
Concept 2
Habitat changes can reduce gene flow and increase edge effects.
Exam cue: Check whether habitat area, isolation, or corridor access changed.
Concept 3
Conservation choices require matching the strategy to the ecological threat.
Exam cue: Link biodiversity loss to ecosystem function.
Risk pitfalls and guardrails
Treating richness and evenness as the same measure.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Ignoring edge effects in fragmented habitat.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Assuming all introduced species become invasive.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Memory anchors
Genetic Diversity
Genetic diversity is variation in genes within a population.
Species Diversity
Species diversity includes richness and evenness in a community.
Ecosystem Diversity
Ecosystem diversity is variety among habitats and ecological processes.
Ecological Tolerance
Ecological tolerance describes the range of conditions a species can survive.
Island Biogeography
Island biogeography predicts species richness from island size and isolation.
Habitat Fragmentation
Habitat fragmentation breaks continuous habitat into smaller isolated patches.
Keystone Species
A keystone species has a disproportionately large ecosystem effect.
Resilience
Resilience is an ecosystem's ability to recover after disturbance.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Biodiversity encompasses variation at which three main levels?
The primary reason species-rich ecosystems tend to be more stable is that greater biodiversity provides:
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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