Sampling design and location of river stretches.

Consecutive number, name, total number of rip-rap samplings (n), total number of point abundance samples (PAS), population status (defined after time since invasion), first record of N. melanostomus, river-kilometers (rkm) and GPS-coordinates of upper and lower boundaries (sorted in upstream to downstream order) of ten representatively distributed rip-rap river stretches from both river shorelines along the upper Danube River. [1] own observations [2] Paintner & Seifert (2006), [3] Zauner (pers. com.) , u = exact time point uncertain, but first record clearly before 2007.