Pyramid of numbers & biomass

Info of pyramids of numbers

• A pyramid of numbers shows the population or number of organisms per unit area or volume) at each stge in a food chain. It is drawn as a bar chart with the bars stacked on top of eachother. The wider the bar the more organisms it represents

• The producer always goes at the bottom and the final consumer at the top

Unusual pyramids of numbers

These are known as inverted pyramids. This could happen if the producer is a large plant, such as a tree, or if one of the animals is very small.

Info of pyramids of numbers

• Biomass is the dry mass of living organisms in an area (habitat) at a particular time.

• A pyramid of biomass represents the mass of organisms at each trophic level.

What are some disadvantages of pyramids of biomass?

• They don't account for complex food webs, where organisms can occupy multiple trophic levels, and they simplify the relationships between different levels.

• they don't consider decomposers

• they don't reflect seasonal or climatic variations.