CCA biplot showing the distribution of trichopteran taxa in storage reservoirs versus landscape metrics in buffer zones (Meadows − areas of wet meadows and fens, Forest − forests, Water − water, TEW − tall emergent vegetation, SW_dista − distance to the nearest standing water body, RW_dista − distance to the nearest running water. The statistically significant parameter is underlined. The taxon codes are explained in Table 2.