Table 1. Vole density index during 2007 at Varanger peninsula.

	Grey-sided vole		Tundra vole
	summer	autumn	summer	autumn
Vestre Jakobselva	3.21 (1.95)	8.97 (1.88)	2.56 (0.89)	3.53 (1.14)
Komagelva	7.64 (2.61)	14.58 (2.32)	14.24 (2.92)	27.43 (4.34)

Vole density index during 2007 in two river catchments at Varanger peninsula, based on snap-trapping, measured as individuals per 100 trapnights per sampling grid (mean and SE). Data for grey-sided voles is from heath grids only, for tundra voles meadow grids only. Vestre Jakobselva had 13 sampling grids per habitat, Komagelva 12.