ssp.

For example, the mountain birch '' Betula pubescens '' ssp. '' czerepanovii '', the main food plant of the autumnal moth, occurs in the continental parts of the Fennoscandian forest tundra where winter temperatures are occasionally lower than the tolerance limit for over-wintering eggs [165]; however, warmer winters are likely to lead to the exploitation of this existing food source.

Phenotypic responses of arctic species to changes in climate and ultraviolet-B radiation 2009