Biomass decreases at each ascending level of the food chain.
A pyramid of biomass is a more accurate representation of the flow of energy through a food chain than a pyramid of numbers , but seasonal variations in the rate of turnover of the organisms at a particular level may result in higher or lower values for the amount of biomass sampled at a particular time than the average amount over the whole year. The best representation of energy flow in a food chain is a pyramid of energy . A Dictionary of Science, Oxford University Press 4. pyramid of numbers A Dictionary of Science, Oxford University Press 5. All rights reserved.