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# A community measure that takes both species abundance anc species richness into account is the Shannon diversity index $H$. To calculate $H$, the proportion $p_{i}$...

## Question

###### A community measure that takes both species abundance anc species richness into account is the Shannon diversity index $H$. To calculate $H$, the proportion $p_{i}$ of species $i$ in the community used. Assume that the community consists of $S$ species. Then $$H=-\left(p_{1} \ln p_{1}+p_{2} \ln p_{2}+\cdots+p_{S} \ln p_{S}\right)$$ (a) Assume that $S=5$ and that all species are equally abundant that is, $p_{1}=p_{2}=\cdots=p_{5}$. Compute $H$. (b) Assume that $S=10$ and that all species are eq

A community measure that takes both species abundance anc species richness into account is the Shannon diversity index $H$. To calculate $H$, the proportion $p_{i}$ of species $i$ in the community used. Assume that the community consists of $S$ species. Then $$H=-\left(p_{1} \ln p_{1}+p_{2} \ln p_{2}+\cdots+p_{S} \ln p_{S}\right)$$ (a) Assume that $S=5$ and that all species are equally abundant that is, $p_{1}=p_{2}=\cdots=p_{5}$. Compute $H$. (b) Assume that $S=10$ and that all species are equally abundant that is, $p_{1}=p_{2}=\cdots=p_{10}$. Compute $H$. (c) A measure of equitability (or evenness) of the specie distribution can be measured by dividing the diversity index $H$ by $\ln S$. Compute $H / \ln S$ for $S=5$ and $S=10$. (d) Show that, in general, if there are $N$ species and all specie are equally abundant, then $$\frac{H}{\ln S}=1$$

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