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Trophic roles and level differences

Ecology • Trophic levels in an ecosystem (biology only)

Key concepts

What you'll likely be quizzed about

  • Producers photosynthesise or chemosynthesise, converting inorganic compounds into organic biomass.
  • Photosynthetic plants and algae capture sunlight energy, building carbohydrate, lipid, and protein tissues that form the foundation of food chains.
  • Limiting factors for producer productivity include light intensity, temperature, carbon dioxide availability, and nutrient supply.
  • Reduced productivity at the base decreases energy input to all higher trophic levels, leading to smaller biomass pyramids.

Flashcards

Test your knowledge with interactive flashcards

What ecological effect follows the removal of a top predator?

Click to reveal answer

Its removal can lead to prey population surges and subsequent changes in vegetation and community balance.

Key notes

Important points to keep in mind

Producers convert inorganic inputs into biomass; light, CO2, nutrients, and temperature limit production.

Roughly 10% of usable energy passes between trophic levels, with about 90% lost to respiration, heat, and waste.

Higher trophic levels possess less biomass and fewer individuals due to cumulative energy loss.

Apex predators enforce top-down control and can trigger trophic cascades when removed or introduced.

Decomposers recycle nutrients; their activity increases with warmth, oxygen, and moisture but slows under anaerobic or extreme pH conditions.

Pyramids of biomass require dry mass measurements to avoid errors from water-content differences.

Food webs illustrate complex feeding relationships, depicting a more realistic picture of energy flow than simple food chains.

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