 Hi, my name is Martin Collins and I'll present to you an experiment we did investigating the effect of the Bacterioplankton community composition and the host genotype on the assembly of the gut microbiota of the water flea Daphnia magna. So we started the experiment by collecting Bacterioplankton communities from various sources. So we had four different sources being a pond with a lot of Daphnia, a water reservoir and a laboratory derived Bacterioplankton community from a Daphnia culture. So here you see that the laboratory derived community was very different from those derived from the natural sources. What we did then is we took five Daphnia magna genotypes and we allowed the bacteria from the Bacterioplankton communities to colonize the guts of the Daphnia. We then asked the question what the relative impact is of the Bacterioplankton and the host genotype on the gut bacterial community. So here you see the composition of the gut microbiota communities grouped by Bacterioplankton treatments. We found that about 30% of the variation in gut microbiota community composition was explained by the Bacterioplankton treatments. So we found significant effects both on quantitative metrics of those taking into account the relative abundance and on qualitative metrics. So those taking into account presence or absence of different species. We also found that more diverse Bacterioplankton communities generally yielded to more diverse gut microbiotas. We also saw a significant effect of the host genotype on the gut microbiota community composition, but this was mainly on the presence or absence of a specific taxa.