Fig. 3.

The relationship between shrimp intestinal and environmental microbiota. a Venn diagram shows the unique and shared OTUs in the different habitats. the shared OTUs majorly belonged to Proteobacteria and Bacteroidetes phylum. b PCoA of microbial communities based on the 16S rRNA sequencing profiles. Samples were clustered into three groups by PCoA based on Bray–Curtis distance, indicating that the microbial structure differed significantly among three habitats. c Classification of the OTU markers for the three habitats. A total of 23 OTU markers were selected as the optimal marker set by a ten-fold CV-error curve. d The relative abundance of the OTU markers at each group. e UPGMA clustering based on the 23 markers revealed that the microbial composition of each group was clearly distinct