ecological pyramid

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Fig. 141 Ecological pyramid . A hypothetical elcological pyramid for standing crop ontropical grassland. Figures in kcal m-2yr-1.

ecological pyramid

a graphical means of illustrating the trophic structure or trophic function of communities. They are of three general types:
  1. the PYRAMID OF NUMBERS, which illustrates the numbers of organisms at each TROPHIC LEVEL (see Fig. 263 ).
  2. the pyramid of BIOMASS, based on DRY WEIGHT (or occasionally live weight) at each level at a given time.
  3. the pyramid of energy which shows the energy flow between each level. See FOOD CHAIN.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Energy analysis also should be a component of the energy pyramid.
Although energy analysis was not shown as one of the building blocks for the pyramid, energy analysis needs to be included during each level of the energy pyramid.
Here are some of the many opportunities to have more mathematics in the biology classroom: (a) using statistical tests to determine the probability that two data sets are really different or that differences are due to chance alone, (b) manipulating common logs for pH and decibels, (c) using other exponentials for dealing with large numbers such as evolutionary time, (d) using binomials (e.g., in Hardy-Weinberg equations for studying allele frequency shifts), (e) applying precision versus accuracy, (f) using proportional reasoning for population sampling, and (g) studying the entropy of an energy pyramid in an ecosystem.

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