Its decline in leachate-fed cycles might be due to toxicity from leachate components such as heavy metals. The second most abundant Geobacter-affiliated OTU was Geobacter sp. strain CLFeRB, a freshwater acetate-oxidizing, iron-reducing bacterium that could methylate mercury. Future experiments will need to be conducted to assess how different reactor configurations affect community changes after leachate additions. The alpha diversity of anodic bacterial communities Oxysophocarpine decreased during acclamation with acetate, then increased when leachate was fed into the MFC. It is conceivable that additional substrates in the leachate, such as proteins, allowed a more diverse community to colonize the anode. For example, an increase of members of Aminiphilus and Cloacibacillus suggested that bacterial communities responded to substrate availability in the leachate. Both genera harbor aminoacid degrading anaerobes. Substrate type was found to be the driver for microbial community structures in anaerobic digestion systems. It is unclear why Bacteroidetes fluctuated but persisted in the MFC as the second most abundant phylum, although members of Bacteroidetes were also found to be abundant on anodes with different sources of inoculum. High microbial diversity has been well recognized as key to ensure robust ecosystem functions. In particular, it was reported that anaerobic digesters with higher community diversity functioned more efficiently. In our system, the lower power production observed from acetate to leachate transition could be due to the growth inhibition of the anode-respiring bacterium G. lovleyi from leachate components. Additional acclamation may be needed for more efficient power Folic acid generation from the landfill leachate. The human gut microbiota is a diverse ecosystem comprising of bacteria, archaea, virus and eukaryotes referred to as the gut microbiota. It has been observed that the composition of gut microbiota depends on environmental factors. Numerous studies focused on gut bacteria, but the repertoire of gut microeukaryotes has been poorly explored. Previous studies indicated that components of the gut microbiota, including gut microeukaryotes, were interacting one with each other. Recently, high-throughput sequencing and clone library sequencing of gut microeukaryote community indicated that fungi and Blastocystis were the two dominant components of gut microeukaryote community. Interestingly, fungal abundance was found to be significantly associated with recently consumed foods: in particular Candida spp. abundance significantly correlated with recent consumption of diet rich in high carbohydrates. Likewise, our previous studies on eukaryote community in an obese individual and in an anorexic individual and revealed fungi diversity related to diet. A diversity of eukaryotic fungi was detected in healthy individuals and infants with low weight. Despite evidence for the gut microeukaryote community being influenced by the environment, a few studies have been reported from a limited number of individuals, mainly living in the northern hemisphere countries. Indeed, of twelve studies, three issued from individuals in Europe, three from the USA, two from China, one from India, one from Turkey, one from Korea and one from Senegal. Therefore, the current body of knowledge may not be representative of the actual diversity of this repertoire, as no data issued from individuals living in southern hemisphere countries such as Polynesia and Amazonia.