Principal component (PC) for habitat depth, helophyte cover and hydrophyte cover for G. bilineatus (green) and G. cinereus (blue). The first principal component (PC1) explains 59% of the variance. The first two components (PC1 and PC2) explain 81% of the total variance. While factor loads of habitat depth, helophyte cover and hydrophyte cover for PC1 are similar, helophyte cover and depth strongly negatively influence PC2. Circles represent 95% probability ellipses.

 
 
  Part of: Knoblauch A, Gander A (2019) Distribution of a residual population of the Dytiscid Graphoderus bilineatus (de Geer, 1774) in the Grande Cari├žaie nature reserves, Switzerland. Alpine Entomology 3: 83-91. https://doi.org/10.3897/alpento.3.30417