The relationship between biodiversity and ecosystem functioning has been shown on multiple occasions over the last decades, but few have examined the evolution of this relationship through time. Up until now, it has been shown that increased biodiversity leads to increased community productivity. This positive relationship is possible thanks to niche complementarity between species as well as selection effects. Together, these two effects cause a feedback which ultimately determines species mixtures. The complementarity effect wins over time, reinforcing the relationship between biodiversity and productivity. Furthermore, studies have shown that functional diversity, while being an indicator of biodiversity, maintains a more linear relationship with productivity; supporting the hypothesis that certain communities present more complementarity than others. Phenotypic plasticity can also reinforce niche complementarity by allowing species traits to differ and thus reducing intraspecific variation. This study aims to investigate the impact of biodiversity on plant ecosystem productivity from a temporal perspective. It will also examine the contribution of both functional diversity and phenotypic plasticity towards the biodiversity-productivity relationship. Small plant organisms, commonly known as duckweed, act as the biological agent of this experiment. These organisms reproduce rapidly, allowing for a multi-generational study to occur over a short period of time.