Additional information

Supplementary Information accompanies this paper at http://www.nature.com/naturecommunications
Supplementary Data 1.List of 358 vertebrate studies in aquatic environments using eDNA methodologies
Supplementary Fig. 1 . Quantitative longitudinal profiles of taxa detected by using eDNA (in red, Nb. eDNA copies/litre) and caught (or not) by conventional sampling (TEF, Nb. of fish caught per ha) from the source to the mouth of the Danube River (2850 km).
Supplementary Tab 1 . Description of the 47 sampled sites
Supplementary Tab 2 . List of reference taxa, corresponding species names, taxa name abbreviations and species caught by using TEF
Supplementary Tab 3 . Danube Reference database (to be added after publication)