Immigration routes of Dryas integrifolia and D. octopetala to Greenland as inferred from their associated fungi
Chlebicki, Andrzej; Knudsen, Henning; Olejniczak, Paweł
Observations on fungi growing on Dryas integrifolia and D. octopetala are used as a complementary method to explain the distribution of these two species in Greenland. Data confirming the hypothesis that D. integrifolia survived the last glaciation on nunataks and that D. octopetala probably immigrated later after the last glaciation are presented. Thirty-three species of fungi were found on the two species of Dryas. The distribution and host specificity of these fungi are used to establish three groups: Dryas-specific fungi, Dryas integrifolia-specific fungi and plurivorous fungi. No D. octopetala-specific fungi were found. Analyses indicate that neighbouring regions in Greenland are most similar with regard to Dryas-specific fungi. No relationship between the distribution of plurivorous fungi and geographical distance were found. Similarities and differences in the distribution of the three fungal groups are discussed and compared with other evidence for the immigration of Dryas into Greenland. The possible role of endemics on Dryas as well as fungal distribution supporting theories about refugia are discussed.