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The number of equally-common species required to give a particular value of an index is called the "effective number of species". This is the true diversity of the community in question. For example, the true diversity associated with a Shannon-Wiener index of 4.5 is exp (4.5) = 90 effective species.
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Feb 9, 2021 · A unified method for measuring diversity was developed by Hill (1973), and re-introduced to ecologists by Jost (2006). This method takes as its starting point that both the number and the relative abundance of species are components of diversity, and that these components cannot be fully separated.
- 272
- 130, Issue3
- 09 February 2021
Sep 23, 2016 · Species diversity is a term used to define the different number of species in an area (Species richness) and its abundance and the distribution of these species in that ecosystem. It’s a measure of the variety in the ecosystem.
Jun 18, 2019 · Given a canonical diversity index such as D Gini, this number of corresponding equally abundant categories is usually called the effective number of species (relative to the index at issue, D Gini in this case).
- Vincenzo Crupi
- vincenzo.crupi@unito.it
- 2019
How do we measure species diversity within a habitat? How do we compare diversity across different types of habitats containing very different numbers and types of organisms? There are many mathematical models that have been developed to quantify species diversity in different habitats.
True diversity, or the effective number of types, refers to the number of equally abundant types needed for the average proportional abundance of the types to equal that observed in the dataset of interest (where all types may not be equally abundant).
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Feb 10, 2021 · Strictly speaking, species diversity is the number of different species in a particular area (species richness) weighted by some measure of abundance such as number of individuals or biomass. However,…
