Herbivore and neighbour effects on tundra plants depend on species identity, nutrient availability and local environmental conditions

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Endemic plant communities on special soils: early victims or hardy survivors of climate change? (2012, background): “Some special soils may simply be limited in primary nutrients (e.g. siliceous soils in the Arctic; Eskelinen 2008), others in water retention capacity (e.”
Arctic lemmings, Lemmus spp. and Dicrostonyx spp.: integrating ecological and evolutionary perspectives (2008, background): “…planted to these grasslands survive well if protected against herbivorous mammals (Moen and Oksanen, 1998; Virtanen, 1998; Olofsson et al., 2002; Eskelinen, 2007), indicating that this local boundary represents a shift between the ‘steppe’ (grassland) stage and the heath stage of the tundra…”
Inclusion of biotic stress (consumer pressure) alters predictions from the stress gradient hypothesis (2009, background): “As other studies have suggested, it is likely that biotic and abiotic stress factors strongly interact (Crain 2008; Eskelinen 2008), which ultimately affects the outcome of species interactions.”
The effects of reindeer grazing on the composition and species richness of vegetation in forest–tundra ecotone (2008, background): “Earlier studies from arctic-alpine ecosystems show that grazing may either reduce the abundance of forbs (Olofsson 2001; Eskelinen and Oksanen 2006; Eskelinen 2008 ) or have no impact on them (Manseau et al. 1996; Olofsson et al. 2001).”