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Keywords:

  • Biomass production;
  • Clonal plants;
  • Ecosystem functioning;
  • Effect traits;
  • Mesocosm experiment;
  • Resource acquisition processes

Abstract

Questions

Is productivity linked with clonal traits through their indirect effect on competitive interactions? Are clonal traits better predictors of productivity than foliar traits?

Location

Rennes, France.

Methods

We used a wide-scale mesocosm experiment based on several assemblages of species differing in clonal traits, and evaluated if the relationship between biomass production and clonal traits is consistent at different ecological scales.

Results

Results showed that at the individual level, foliar traits were independent from clonal traits in most studied species. Community specific above-ground net primary productivity was significantly correlated to community-aggregated values of clonal and foliar traits. Nevertheless, a stronger relationship with clonal traits was indicated, emphasizing a plant foraging strategy along the horizontal plant plane, which was a determinant of community productivity. An inverse relationship between clonal traits and biomass production was observed at the individual and community levels, which was attributed to modifications in resource acquisition processes resulting from competitive interactions.

Conclusions

We demonstrated that clonal traits are correlated with productivity at the individual and community scales. These traits were indicators of resource acquisition processes mediated through competitive interactions.