The <i>N</i> = 16 sampling locations with geographic coordinates, environmental variables, species richness and individual numbers.

<p>Environmental variables: primary productivity (<i>NPP</i>; in kg C per m² per year), annual mean temperature (<i>T</i>; in °C), annual rainfall (<i>R</i>; in mm), minimal potential evapotranspiration (<i>PET_min</i>; in mm). Species richness (<i>S</i>) and individual numbers (<i>N</i>) per habitat with subscripts as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0045875#pone-0045875-t001" target="_blank">Table 1</a>.