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Pyramids of biomass: constructing and interpreting

Ecology • Trophic levels in an ecosystem (biology only)

Key concepts

What you'll likely be quizzed about

  • Biomass is the mass of living or recently dead organisms, measured in grams or kilograms.
  • Scientists primarily use dry mass for biomass calculations to account for variations in water content among organisms and over time.
  • Measuring dry mass typically involves drying samples before weighing, although field studies often use estimates to minimize harm to organisms.

Flashcards

Test your knowledge with interactive flashcards

Why do many field studies use biomass estimates rather than drying all organisms?

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Drying organisms is often destructive and impractical; using estimates allows for data collection with minimal harm.

Key notes

Important points to keep in mind

Biomass is living or recently dead tissue, typically measured as dry mass to remove water variability.

Total biomass = number of individuals × dry mass of one individual; ensure unit conversion beforehand.

Pyramids of biomass feature producers at the base, with consumers stacked above; bars represent total biomass proportionally.

Approximately 10% of biomass transfers between trophic levels; respiration and waste predominantly account for losses.

Sampling bias, seasonal variation, and mobile organisms limit the accuracy of biomass estimates, mitigated by random sampling and large sample sizes.

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