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Biodiversity is usually plotted as the richness of a geographic area, with some reference to a temporal scale. Types of biodiversity include taxonomic or species, ecological, morphological, and genetic diversity. Taxonomic diversity, that is the number of species, genera, family is the most commonly assessed type. [7]
Area-based counts, distance methods, and mark–recapture studies are the three general categories of methods for estimating abundance. Species evenness is combined with species richness, (the number of species in the community), in order to determine species diversity, which is an important measure of community structure. Community structure ...
The authors note that these estimates are strongest for eukaryotic organisms and likely represent the lower bound of prokaryote diversity. [18] Other estimates include: 220,000 vascular plants, estimated using the species-area relation method [19] 0.7-1 million marine species [20] 10–30 million insects; [21] (of some 0.9 million we know today ...
Resampling methods can be used to bring samples of different sizes to a common footing. [2] Properties of the sample, especially the number of species only represented by one or a few individuals, can be used to help estimating the species richness in the population from which the sample was drawn. [3] [4] [5]
The technique of rarefaction was developed in 1968 by Howard Sanders in a biodiversity assay of marine benthic ecosystems, as he sought a model for diversity that would allow him to compare species richness data among sets with different sample sizes; he developed rarefaction curves as a method to compare the shape of a curve rather than absolute numbers of species.
There are several methods for measuring abundance. An example of this is Semi-Quantitive Abundance ratings. [6] These are measurement methods which involve estimation based on viewing a specific area of a designated size. [6] The two Semi-Quantitive Abundance ratings used are known as the D.A.F.O.R, and the A.C.F.O.R. [6]
Belt transects are used in biology, more specifically in biostatistics, to estimate the distribution of organisms in relation to a certain area, such as the seashore or a meadow. [1] [2] The belt transect method is similar to the line transect method but gives information on abundance as well as presence, or absence of species. [3] [4]
With Lou Jost, Chao is the author of Diversity Analysis (Taylor & Francis, 2008; Chapman & Hall, 2017). She is also the author of Statistical Estimation of Biodiversity Indices (Wiley, 2017) with Chun-Huo Chiu and Jost. [1] Chao was elected as a fellow of the Institute of Mathematical Statistics in 1997. [1]
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