 Hi everyone, my name is Konstantinos from the Friedrichschilder University, Vienna in Germany. I would like to briefly present a recently published paper on biodiversity's contrasting effects on the functioning of bacteria. Due to the extremely high diversity of natural material communities, it is difficult to understand specific community processes, such as the effects of biodiversity on ecological functioning. To overcome that complexity, synthetic bacterial communities are an excellent tool. So now we can ask, what are the specific effects of species' polykinetic metabolic diversity on the ecological functions of their communities? Improved bacteria perform ecological functions like organic material degradation using different exo-enzymes. This allows communities to share exo-enzymes and substrate degradation products. To answer how bacterial diversity influences substrate degradation by communities, we monitor the exo-enzyme activity using fluorescently labeled substrates. Using the phylogenetic metabolic diversity of bacterial isolates, we formed four treatments. Communities in each treatment were either phylogenetically similar or dissimilar, and metabolically similar or dissimilar. We modeled community diversity against ecological functioning, such as carbon acquisition potential from substrates. We found that both diversity treatments have a relationship with community ecological functioning, but surprisingly, the effects inverted when we controlled for the effects of the other treatments. What was even more interesting was that the ecological context, which in this case was the biochemical nature of each substrate, was intensifying the effects of each diversity treatment. Additionally, gene-specific interactions appear to be influencing the effects of diversity on substrate degradation. This highlights that phylogeny-related metabolic capabilities of different bacterial genera influence how positive or negative interactions play out in the community. In closing, we show that both diversity treatments show strong but also opposing effects with community functioning. But the most exciting part for me was successfully linking phylogenetic diversity with metabolic diversity and ecological function. This way, we highlighted the unique flexibility and intricacy of bacterial communities that must be considered in ecological theory frameworks. Thank you for watching.