Figure 1 Study area and investigated species. a) View of the Dolomites
from the north (Conturines massif) towards the southwest, showing the
typical geomorphology which results in a sky-island system of alpine
habitats. b) Density of occurrence along the elevation gradient for all
known populations of each species. c) Distribution ranges ofCampanula morettiana (blue dots and solid line), Primula
tyrolensis (pink dots and short-dashed line) and Saxifraga
facchinii (red dots and long-dashed line). White triangles
highlight the Piave Valley. Green-colored areas represent carbonate
bedrock, which is suitable for the study species. The gray scale in the
background represents the elevation from 100m to 3343m a.s.l. Maps were
generated with UTM 32 N projection, with datum WGS84. Photo of
landscape, C. morettiana and S. facchinii by F. Rota,
photo of P. tyrolensis by J. Nascimbene.