Our study localities are located in Troms and Finnmark counties in Northern Norway, approx. 69-70°N, 18-30 °E. Most of our sites experience an oceanic climate with mild and snow-rich winters and cool summers. Tromsø (69°40’N, 19° E) has a mean temperatures of -4.4°C in January and 9.1°C in July and an annual precipitation of just above 1000 mm.
The location of our main study sites in Northern Norway: