Figure 1

Phylum and OTU-level gut microbiota composition of the shrimps. (A) The total proportional distributions of the dominant phyla (higher than 1% of the total sequences) in total 141 samples. (B) Heat map of the 48 OTUs picked out with the criterion that their abundances in the whole gut microbial community were higher than 1% in at least half of the samples of each group. The color of spots in the panel represents the mean relative abundance (normalized and log-transformed) of the OTU in each group. The values on the color bar represent the mean sequence number with log-transformed. The OTUs are organized according to the assignment of the phylogenetic tree which built with the method of Neighbor-Join Tree. (C) Relative abundances of these OTUs in each group. The proportion of compartments in each phylum means the average relative abundance of the OTU in each group. Different color schemes represent different phyla (blue: Proteobacteria, green: Firmicutes; orange: Bacteroidetes red: Verrucomicrobia; purple: Actinobacteria;). NW1: first week of control diet group; KW1: first week of krill meal diet group. Sample size: for KM group, n = 7 on weeks 3; for NC group, n = 8 on weeks 7; others n = 9.