Why this chapter matters
Ecology explains how biological systems persist, recover, or shift when conditions and interactions change.
What you will learn
- Model energy flow through trophic levels and explain limits on transfer efficiency.
- Relate biogeochemical cycles to ecosystem productivity and long-term stability.
- Use population growth models and interaction types to predict community-level effects.
Lessons in this chapter
- Energy flow and trophic structureQuantify transfer between producers, consumers, and decomposers using ecological pyramids.
- Biogeochemical cyclesTrace carbon, nitrogen, and water movement across biotic and abiotic reservoirs.
- Population ecologyCompare exponential and logistic growth and interpret carrying capacity in context.
- Community interactions and resilienceEvaluate competition, predation, symbiosis, and disturbance responses.
Study task
Given a food web and disturbance scenario, predict two likely short-term and two likely longer-term ecosystem effects with reasoning.
Chapter checkpoint
Why does only a fraction of energy pass to the next trophic level?
Organisms use much of consumed energy for metabolism, maintenance, and heat loss, so only part is stored as biomass available to the next level.