Diversity of terrestrial ecosystems in protected areas

Diversity of terrestrial ecosystems in protected areas

Terrestrial Ecosystems in Country and WDPA protected sites. Analysis performed by L. Battistella in February 2021. Original dataset provided by "USGS-TNC" (World Terrestrial Ecosystems, Sayre et al. 2020).

Diversity of terrestrial ecosystems in protected areas and countries expressed by Shannon index.

Shannon or Shannon--Weaver (or Shannon--Wiener) index is defined as $H = -sum p_i log(b) p_i$, where $p_i$ is the proportional abundance of species $i$ and $b$ is the base of the logarithm. It is most popular to use natural logarithms, but some argue for base $b = 2$ (which makes sense, but no real difference). 

Range: SHDI ≥ 0, without limit. SHDI = 0 when the landscape contains only 1 patch (i.e., no diversity). SHDI increases as the number of different patch types (i.e., patch richness) increases and/or the proportional distribution of area among patch types becomes more equitable.

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