density–frequency–dominance
density–frequency–dominance (DFD measure) A combined abundance estimate used in early North American ordination schemes but now rarely used. Usually expressed as relative values, relative density is the number of a given species expressed as a percentage of all species present, relative frequency is the frequency of a given species expressed as a percentage of the sum of frequency values for all species present, and relative dominance is the basal area of a given species expressed as a percentage of the total basal area of all species present. These three measures are summed to give the importance value, which may lie between 0 and 300.
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Relative-importance Value , relative-importance value In ecology, a concept similar in principle to importance value, but based on original, somewhat relative, density–frequency… Climax Adaptation Number , climax adaptation number A value, in the range 1–10, assigned to species in the Wisconsin ordination scheme and based on the species' importance valu… Indifferent Species , indifferent species A species with no real affinity for any particular community, but which is not rare (as an accidental species would be). It is fi… Constellation Diagram , constellation diagram A representation of species affinities that is based on χ2 as a measure of the association between species. The reciprocal of t… preferential species , preferential species In phytosociology, a species that is present with varying abundance in several communities, but is especially abundant and vigor… accidental species , accidental species One of five classes of fidelity used by the Braun-Blanquet school of phytosociology in the description and classification of plant…
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density–frequency–dominance