In macroecology and community ecology, an occupancy frequency distribution (OFD) is the distribution of the numbers of species occupying different numbers of areas. It was first reported in 1918 by the Danish botanist Christen C. Raunkiær in his study on plant communities. The OFD is also known as the species-range size distribution in literature.
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👉 Occupancy frequency distribution in the context of Dominance (ecology)
Ecological dominance is the degree to which one or several species have a major influence controlling the other species in their ecological community (because of their large size, population, productivity, or related factors) or make up more of the biomass. Both the composition and abundance of species within an ecosystem can be affected by the dominant species present.
In most of the world's ecosystems, biologists have repeatedly observed a rank-abundance curve in which ecosystems comprise a handful of incredibly abundant species, but more numerous, rarer species that are few in number. Danish botanist Christen C. Raunkiær described this phenomenon as his "law of frequency" in 1918, in which he recognized that in communities with a single species accounting for most of the biomass, species diversity was often lower.