02163nas a2200301 4500008004100000245007600041210006900117300001200186490000800198520129700206100001601503700001801519700002001537700001701557700001701574700001701591700001701608700001701625700001301642700001801655700001701673700002601690700001701716700001701733700001101750700002001761856008001781 2020 eng d00aMass ratio effects underlie ecosystem responses to environmental change0 aMass ratio effects underlie ecosystem responses to environmental a855-8640 v1083 a
1. Random species loss has been shown experimentally to reduce ecosystem function, sometimes more than other anthropogenic environmental changes. Yet, controversy surrounds the importance of this finding for natural systems where species loss is non‐random.
2. We compiled data from 16 multi‐year experiments located at a single native tallgrass prairie site. These experiments included responses to 11 anthropogenic environmental changes, as well as non‐random biodiversity loss either the removal of uncommon/rare plant species or the most common (dominant) species.
3. As predicted by the mass ratio hypothesis, loss of a dominant species had large impacts on productivity that were comparable to other anthropogenic drivers. In contrast, the loss of uncommon/rare species had small effects on productivity despite having the largest effects on species richness.
4. The anthropogenic drivers that had the largest effects on productivity nitrogen, irrigation, and fire experienced not only loss of species but also significant changes in the abundance and identity of dominant species.
5. Synthesis. These results suggest that mass ratio effects, rather than species loss per se, are an important determinant of ecosystem function with environmental change.