The idea that stress may notably change the way in which species interact to affect ecosystem processes has been variously assessed in experiments focusing on plants. For example, Mulder, Uliassi & Doak (2001) found that diverse moss communities performed better than speciespoor moss communities when exposed to a moderate experimental drought, and that this effect was mainly due to enhanced performance of those species that were most affected by drought when grown in isolation. Similarly, Steudel et al. (2012) considered the strength of diversity effects on algal biomass production along an experimental temperature and salinity gradient and observed that the relative biodiversity effects increased at elevated temperatures and salinities, although the absolute diversity effect did not. These results suggest that to some extent high plant species richness can act as an insurance policy against stress, although other patterns have also been observed – including a negative diversity effect on plant productivity in infertile soil despite a positive effect in fertile conditions (Fridley 2002). Fuge`re et al. (2012) are among the first to apply these concepts to animal communities.