We would like to thank to our friends and colleagues for their useful comments, namely Angela A. Bruch, Frédéric M. B. Jacques, Arata Momohara, Zlatko Kvaček and Ivan Gabrielyan .

Building of the IPR-vegetation analysis website and database was supported by the grant projects GA ČR (Grant Agency of the Czech Republic) No. P210/10/0124 and 18-25057S.