Fig. 1

Gut microbiota dynamics in the crewmembers throughout the longest ground-based space simulation, MARS500. Graphical representation is based on Fig. 1 from David et al. [5]. a Stream plots showing OTU fractional abundances over time. Each stream is an OTU colored by phylum, whose width is proportional to the OTU relative abundance at a given time point (see gray dots above each plot and the timeline below with entry and exit flags). b Horizon graphs of the relative abundance variation of highly abundant OTUs over time. For each OTU, time series were median-centered and curves were divided into colored bands, whose width is the median absolute deviation, that were then overlaid, with negative values mirrored upwards. Warm and cool colors indicate relative abundance above or below the median, respectively, with red denoting greater abundance above the median than yellow, and blue greater abundance reduction below the median than green. Squares on the vertical axis are colored as in a. For the list of highly abundant OTUs, please see Additional file 2: Table S1