pyramid of numbers
McGraw-Hill Science & Technology Dictionary:
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pyramid of numbers
(′pir·ə′mid əv ′nəm·bərz)
(ecology) The concept that an organism making up the base of a food chain is numerically abundant while each succeeding member of the chain is represented by successively fewer individuals; uses feeding relationship as a basis for the quantitative analysis of an ecological system.
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pyramid of numbers
Oxford Dictionary of Geography:
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pyramid of numbers
ecological pyramid
A diagram of a food chain which shows each trophic level as a horizontal bar. The bars are centred about a vertical axis and the levels are drawn in proportion to the biomass at each level. There is a big step between producers and primary consumers, but thereafter the steps are smaller. Generally speaking, the animals on the higher levels are larger and rarer than animals lower down the pyramid.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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