Table 1.

Plant functional groups used as predictor variable for each rodent species. “Composition” describes which taxa were included in the group and “Function” describes the extent to which food and shelter was likely provided by the plant group

Growth form	Plant functional group	Tundra vole		Grey‐sided vole		Lemming
		Composition	Function	Composition	Function	Composition	Function
Forbs	Forbs	All forbs—excluding Rumex acetosa	Preferred food, shelter (forbs in meadow habitats can be large)	All forbs	Preferred food, unlikely shelter (forbs in heath habitat are small)	All forbs	Food, unlikely shelter (forbs in heath habitat are small)
	Rumex	Rumex acetosa	Preferred food, unlikely shelter	NAF (included in forbs)		NAF (included in forbs)
Shrubs	Shelter shrubs	Betulaceae, Ericaceae	Shelter, occur rarely in diets, not selected for	Betulaceae, evergreen Ericaceae, Salicaceae	Shelter, occur in diets but not selected for	Betulaceae, Ericaceae	Shelter, occur rarely in diets
	Palatable shrubs	Salicaceae	Preferred food, shelter	Deciduous Ericaceae	Preferred food, shelter	Salicaceae	Food, shelter
Graminoids	Palatable grasses	Poaceae excluding silica‐rich species	Preferred food, unlikely shelter	NAF	Minor diet component	Poaceae excluding silica‐rich species	Food, unlikely shelter
	Shelter grasses	Tussock‐forming grasses (Deschampsia cespitosa)	Shelter	NAF	Low abundance in heath	NAF	Low abundance in heath
	Sedges	NAF		NAF		Cyperaceae, Juncaceae	Food

NAF: not analysed for.